-/* $Cambridge: exim/src/src/smtp_in.c,v 1.41 2006/07/27 11:29:32 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2006 */
+/* Copyright (c) University of Cambridge 1995 - 2017 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions for handling an incoming SMTP call. */
#include "exim.h"
+#include <assert.h>
/* Initialize for TCP wrappers if so configured. It appears that the macro
int allow_severity = LOG_INFO;
int deny_severity = LOG_NOTICE;
+uschar *tcp_wrappers_name;
#endif
/* Size of buffer for reading SMTP commands. We used to use 512, as defined
by RFC 821. However, RFC 1869 specifies that this must be increased for SMTP
commands that accept arguments, and this in particular applies to AUTH, where
-the data can be quite long. */
+the data can be quite long. More recently this value was 2048 in Exim;
+however, RFC 4954 (circa 2007) recommends 12288 bytes to handle AUTH. Clients
+such as Thunderbird will send an AUTH with an initial-response for GSSAPI.
+The maximum size of a Kerberos ticket under Windows 2003 is 12000 bytes, and
+we need room to handle large base64-encoded AUTHs for GSSAPI.
+*/
-#define smtp_cmd_buffer_size 2048
+#define SMTP_CMD_BUFFER_SIZE 16384
/* Size of buffer for reading SMTP incoming packets */
-#define in_buffer_size 8192
+#define IN_BUFFER_SIZE 8192
/* Structure for SMTP command list */
typedef struct {
- char *name;
+ const char *name;
int len;
short int cmd;
short int has_arg;
VRFY_CMD, EXPN_CMD, NOOP_CMD, /* RFC as requiring synchronization */
ETRN_CMD, /* This by analogy with TURN from the RFC */
STARTTLS_CMD, /* Required by the STARTTLS RFC */
+ TLS_AUTH_CMD, /* auto-command at start of SSL */
/* This is a dummy to identify the non-sync commands when pipelining */
NON_SYNC_CMD_NON_PIPELINING,
+ /* RFC3030 section 2: "After all MAIL and RCPT responses are collected and
+ processed the message is sent using a series of BDAT commands"
+ implies that BDAT should be synchronized. However, we see Google, at least,
+ sending MAIL,RCPT,BDAT-LAST in a single packet, clearly not waiting for
+ processing of the RCPT response(s). We shall do the same, and not require
+ synch for BDAT. Worse, as the chunk may (very likely will) follow the
+ command-header in the same packet we cannot do the usual "is there any
+ follow-on data after the command line" even for non-pipeline mode.
+ So we'll need an explicit check after reading the expected chunk amount
+ when non-pipe, before sending the ACK. */
+
+ BDAT_CMD,
+
/* I have been unable to find a statement about the use of pipelining
with AUTH, so to be on the safe side it is here, though I kind of feel
it should be up there with the synchronized commands. */
QUIT_CMD, HELP_CMD,
+#ifdef SUPPORT_PROXY
+ PROXY_FAIL_IGNORE_CMD,
+#endif
+
/* These are specials that don't correspond to actual commands */
EOF_CMD, OTHER_CMD, BADARG_CMD, BADCHAR_CMD, BADSYN_CMD,
TOO_MANY_NONMAIL_CMD };
+/* This is a convenience macro for adding the identity of an SMTP command
+to the circular buffer that holds a list of the last n received. */
+
+#define HAD(n) \
+ smtp_connection_had[smtp_ch_index++] = n; \
+ if (smtp_ch_index >= SMTP_HBUFF_SIZE) smtp_ch_index = 0
+
/*************************************************
* Local static variables *
#ifdef SUPPORT_TLS
static BOOL tls_advertised;
#endif
+static BOOL dsn_advertised;
static BOOL esmtp;
static BOOL helo_required = FALSE;
static BOOL helo_verify = FALSE;
static BOOL helo_accept_junk;
static BOOL count_nonmail;
static BOOL pipelining_advertised;
+static BOOL rcpt_smtp_response_same;
+static BOOL rcpt_in_progress;
static int nonmail_command_count;
+static BOOL smtp_exit_function_called = 0;
+#ifdef SUPPORT_I18N
+static BOOL smtputf8_advertised;
+#endif
static int synprot_error_count;
static int unknown_command_count;
static int sync_cmd_limit;
static int smtp_write_error = 0;
+static uschar *rcpt_smtp_response;
+static uschar *smtp_data_buffer;
+static uschar *smtp_cmd_data;
+
/* We need to know the position of RSET, HELO, EHLO, AUTH, and STARTTLS. Their
final fields of all except AUTH are forced TRUE at the start of a new message
setup, to allow one of each between messages that is not counted as a nonmail
forced TRUE, to allow for the re-authentication that can happen at that point.
QUIT is also "falsely" labelled as a mail command so that it doesn't up the
-count of non-mail commands and possibly provoke an error. */
+count of non-mail commands and possibly provoke an error.
+
+tls_auth is a pseudo-command, never expected in input. It is activated
+on TLS startup and looks for a tls authenticator. */
static smtp_cmd_list cmd_list[] = {
+ /* name len cmd has_arg is_mail_cmd */
+
{ "rset", sizeof("rset")-1, RSET_CMD, FALSE, FALSE }, /* First */
{ "helo", sizeof("helo")-1, HELO_CMD, TRUE, FALSE },
{ "ehlo", sizeof("ehlo")-1, EHLO_CMD, TRUE, FALSE },
{ "auth", sizeof("auth")-1, AUTH_CMD, TRUE, TRUE },
#ifdef SUPPORT_TLS
{ "starttls", sizeof("starttls")-1, STARTTLS_CMD, FALSE, FALSE },
+ { "tls_auth", 0, TLS_AUTH_CMD, FALSE, TRUE },
#endif
/* If you change anything above here, also fix the definitions below. */
{ "mail from:", sizeof("mail from:")-1, MAIL_CMD, TRUE, TRUE },
{ "rcpt to:", sizeof("rcpt to:")-1, RCPT_CMD, TRUE, TRUE },
{ "data", sizeof("data")-1, DATA_CMD, FALSE, TRUE },
+ { "bdat", sizeof("bdat")-1, BDAT_CMD, TRUE, TRUE },
{ "quit", sizeof("quit")-1, QUIT_CMD, FALSE, TRUE },
{ "noop", sizeof("noop")-1, NOOP_CMD, TRUE, FALSE },
{ "etrn", sizeof("etrn")-1, ETRN_CMD, TRUE, FALSE },
#define CMD_LIST_EHLO 2
#define CMD_LIST_AUTH 3
#define CMD_LIST_STARTTLS 4
+#define CMD_LIST_TLS_AUTH 5
-static uschar *protocols[] = {
+/* This list of names is used for performing the smtp_no_mail logging action.
+It must be kept in step with the SCH_xxx enumerations. */
+
+static uschar *smtp_names[] =
+ {
+ US"NONE", US"AUTH", US"DATA", US"BDAT", US"EHLO", US"ETRN", US"EXPN",
+ US"HELO", US"HELP", US"MAIL", US"NOOP", US"QUIT", US"RCPT", US"RSET",
+ US"STARTTLS", US"VRFY" };
+
+static uschar *protocols_local[] = {
US"local-smtp", /* HELO */
US"local-smtps", /* The rare case EHLO->STARTTLS->HELO */
US"local-esmtp", /* EHLO */
US"local-esmtpa", /* EHLO->AUTH */
US"local-esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */
};
+static uschar *protocols[] = {
+ US"smtp", /* HELO */
+ US"smtps", /* The rare case EHLO->STARTTLS->HELO */
+ US"esmtp", /* EHLO */
+ US"esmtps", /* EHLO->STARTTLS->EHLO */
+ US"esmtpa", /* EHLO->AUTH */
+ US"esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */
+ };
#define pnormal 0
#define pextend 2
#define pcrpted 1 /* added to pextend or pnormal */
#define pauthed 2 /* added to pextend */
-#define pnlocal 6 /* offset to remove "local" */
+
+/* Sanity check and validate optional args to MAIL FROM: envelope */
+enum {
+ ENV_MAIL_OPT_NULL,
+ ENV_MAIL_OPT_SIZE, ENV_MAIL_OPT_BODY, ENV_MAIL_OPT_AUTH,
+#ifndef DISABLE_PRDR
+ ENV_MAIL_OPT_PRDR,
+#endif
+ ENV_MAIL_OPT_RET, ENV_MAIL_OPT_ENVID,
+#ifdef SUPPORT_I18N
+ ENV_MAIL_OPT_UTF8,
+#endif
+ };
+typedef struct {
+ uschar * name; /* option requested during MAIL cmd */
+ int value; /* enum type */
+ BOOL need_value; /* TRUE requires value (name=value pair format)
+ FALSE is a singleton */
+ } env_mail_type_t;
+static env_mail_type_t env_mail_type_list[] = {
+ { US"SIZE", ENV_MAIL_OPT_SIZE, TRUE },
+ { US"BODY", ENV_MAIL_OPT_BODY, TRUE },
+ { US"AUTH", ENV_MAIL_OPT_AUTH, TRUE },
+#ifndef DISABLE_PRDR
+ { US"PRDR", ENV_MAIL_OPT_PRDR, FALSE },
+#endif
+ { US"RET", ENV_MAIL_OPT_RET, TRUE },
+ { US"ENVID", ENV_MAIL_OPT_ENVID, TRUE },
+#ifdef SUPPORT_I18N
+ { US"SMTPUTF8",ENV_MAIL_OPT_UTF8, FALSE }, /* rfc6531 */
+#endif
+ /* keep this the last entry */
+ { US"NULL", ENV_MAIL_OPT_NULL, FALSE },
+ };
/* When reading SMTP from a remote host, we have to use our own versions of the
C input-reading functions, in order to be able to flush the SMTP output only
static int smtp_had_error;
+/* forward declarations */
+int bdat_ungetc(int ch);
+static int smtp_read_command(BOOL check_sync, unsigned buffer_lim);
+static int synprot_error(int type, int code, uschar *data, uschar *errmess);
+static void smtp_quit_handler(uschar **, uschar **);
+static void smtp_rset_handler(void);
+
+/*************************************************
+* Recheck synchronization *
+*************************************************/
+
+/* Synchronization checks can never be perfect because a packet may be on its
+way but not arrived when the check is done. Such checks can in any case only be
+done when TLS is not in use. Normally, the checks happen when commands are
+read: Exim ensures that there is no more input in the input buffer. In normal
+cases, the response to the command will be fast, and there is no further check.
+
+However, for some commands an ACL is run, and that can include delays. In those
+cases, it is useful to do another check on the input just before sending the
+response. This also applies at the start of a connection. This function does
+that check by means of the select() function, as long as the facility is not
+disabled or inappropriate. A failure of select() is ignored.
+
+When there is unwanted input, we read it so that it appears in the log of the
+error.
+
+Arguments: none
+Returns: TRUE if all is well; FALSE if there is input pending
+*/
+
+static BOOL
+check_sync(void)
+{
+int fd, rc;
+fd_set fds;
+struct timeval tzero;
+
+if (!smtp_enforce_sync || sender_host_address == NULL ||
+ sender_host_notsocket || tls_in.active >= 0)
+ return TRUE;
+
+fd = fileno(smtp_in);
+FD_ZERO(&fds);
+FD_SET(fd, &fds);
+tzero.tv_sec = 0;
+tzero.tv_usec = 0;
+rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero);
+
+if (rc <= 0) return TRUE; /* Not ready to read */
+rc = smtp_getc(GETC_BUFFER_UNLIMITED);
+if (rc < 0) return TRUE; /* End of file or error */
+
+smtp_ungetc(rc);
+rc = smtp_inend - smtp_inptr;
+if (rc > 150) rc = 150;
+smtp_inptr[rc] = 0;
+return FALSE;
+}
+
+
+
+/*************************************************
+* Log incomplete transactions *
+*************************************************/
+
+/* This function is called after a transaction has been aborted by RSET, QUIT,
+connection drops or other errors. It logs the envelope information received
+so far in order to preserve address verification attempts.
+
+Argument: string to indicate what aborted the transaction
+Returns: nothing
+*/
+
+static void
+incomplete_transaction_log(uschar *what)
+{
+if (sender_address == NULL || /* No transaction in progress */
+ !LOGGING(smtp_incomplete_transaction))
+ return;
+
+/* Build list of recipients for logging */
+
+if (recipients_count > 0)
+ {
+ int i;
+ raw_recipients = store_get(recipients_count * sizeof(uschar *));
+ for (i = 0; i < recipients_count; i++)
+ raw_recipients[i] = recipients_list[i].address;
+ raw_recipients_count = recipients_count;
+ }
+
+log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS,
+ "%s incomplete transaction (%s)", host_and_ident(TRUE), what);
+}
+
+
+
+
/*************************************************
* SMTP version of getc() *
*************************************************/
/* This gets the next byte from the SMTP input buffer. If the buffer is empty,
it flushes the output, and refills the buffer, with a timeout. The signal
handler is set appropriately by the calling function. This function is not used
-after a connection has negotated itself into an TLS/SSL state.
+after a connection has negotiated itself into an TLS/SSL state.
-Arguments: none
+Arguments: lim Maximum amount to read/buffer
Returns: the next character or EOF
*/
int
-smtp_getc(void)
+smtp_getc(unsigned lim)
{
if (smtp_inptr >= smtp_inend)
{
int rc, save_errno;
+ if (!smtp_out) return EOF;
fflush(smtp_out);
if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
- rc = read(fileno(smtp_in), smtp_inbuffer, in_buffer_size);
+
+ /* Limit amount read, so non-message data is not fed to DKIM */
+
+ rc = read(fileno(smtp_in), smtp_inbuffer, MIN(IN_BUFFER_SIZE, lim));
save_errno = errno;
alarm(0);
if (rc <= 0)
else smtp_had_eof = 1;
return EOF;
}
+#ifndef DISABLE_DKIM
+ dkim_exim_verify_feed(smtp_inbuffer, rc);
+#endif
smtp_inend = smtp_inbuffer + rc;
smtp_inptr = smtp_inbuffer;
}
return *smtp_inptr++;
}
+void
+smtp_get_cache(void)
+{
+#ifndef DISABLE_DKIM
+int n = smtp_inend - smtp_inptr;
+if (n > 0)
+ dkim_exim_verify_feed(smtp_inptr, n);
+#endif
+}
+
+
+/* Get a byte from the smtp input, in CHUNKING mode. Handle ack of the
+previous BDAT chunk and getting new ones when we run out. Uses the
+underlying smtp_getc or tls_getc both for that and for getting the
+(buffered) data byte. EOD signals (an expected) no further data.
+ERR signals a protocol error, and EOF a closed input stream.
+
+Called from read_bdat_smtp() in receive.c for the message body, but also
+by the headers read loop in receive_msg(); manipulates chunking_state
+to handle the BDAT command/response.
+Placed here due to the correlation with the above smtp_getc(), which it wraps,
+and also by the need to do smtp command/response handling.
+
+Arguments: lim (ignored)
+Returns: the next character or ERR, EOD or EOF
+*/
+
+int
+bdat_getc(unsigned lim)
+{
+uschar * user_msg = NULL;
+uschar * log_msg;
+
+for(;;)
+ {
+ if (chunking_data_left > 0)
+ return lwr_receive_getc(chunking_data_left--);
+
+ receive_getc = lwr_receive_getc;
+ receive_ungetc = lwr_receive_ungetc;
+#ifndef DISABLE_DKIM
+ dkim_collect_input = FALSE;
+#endif
+
+ /* Unless PIPELINING was offered, there should be no next command
+ until after we ack that chunk */
+
+ if (!pipelining_advertised && !check_sync())
+ {
+ incomplete_transaction_log(US"sync failure");
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error "
+ "(next input sent too soon: pipelining was not advertised): "
+ "rejected \"%s\" %s next input=\"%s\"",
+ smtp_cmd_buffer, host_and_ident(TRUE),
+ string_printing(smtp_inptr));
+ (void) synprot_error(L_smtp_protocol_error, 554, NULL,
+ US"SMTP synchronization error");
+ goto repeat_until_rset;
+ }
+
+ /* If not the last, ack the received chunk. The last response is delayed
+ until after the data ACL decides on it */
+
+ if (chunking_state == CHUNKING_LAST)
+ {
+#ifndef DISABLE_DKIM
+ dkim_exim_verify_feed(NULL, 0); /* notify EOD */
+#endif
+ return EOD;
+ }
+
+ smtp_printf("250 %u byte chunk received\r\n", chunking_datasize);
+ chunking_state = CHUNKING_OFFERED;
+ DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
+
+ /* Expect another BDAT cmd from input. RFC 3030 says nothing about
+ QUIT, RSET or NOOP but handling them seems obvious */
+
+next_cmd:
+ switch(smtp_read_command(TRUE, 1))
+ {
+ default:
+ (void) synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"only BDAT permissible after non-LAST BDAT");
+
+ repeat_until_rset:
+ switch(smtp_read_command(TRUE, 1))
+ {
+ case QUIT_CMD: smtp_quit_handler(&user_msg, &log_msg); /*FALLTHROUGH */
+ case EOF_CMD: return EOF;
+ case RSET_CMD: smtp_rset_handler(); return ERR;
+ default: if (synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"only RSET accepted now") > 0)
+ return EOF;
+ goto repeat_until_rset;
+ }
+
+ case QUIT_CMD:
+ smtp_quit_handler(&user_msg, &log_msg);
+ /*FALLTHROUGH*/
+ case EOF_CMD:
+ return EOF;
+
+ case RSET_CMD:
+ smtp_rset_handler();
+ return ERR;
+
+ case NOOP_CMD:
+ HAD(SCH_NOOP);
+ smtp_printf("250 OK\r\n");
+ goto next_cmd;
+
+ case BDAT_CMD:
+ {
+ int n;
+
+ if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1)
+ {
+ (void) synprot_error(L_smtp_protocol_error, 501, NULL,
+ US"missing size for BDAT command");
+ return ERR;
+ }
+ chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0
+ ? CHUNKING_LAST : CHUNKING_ACTIVE;
+ chunking_data_left = chunking_datasize;
+ DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n",
+ (int)chunking_state, chunking_data_left);
+
+ if (chunking_datasize == 0)
+ if (chunking_state == CHUNKING_LAST)
+ return EOD;
+ else
+ {
+ (void) synprot_error(L_smtp_protocol_error, 504, NULL,
+ US"zero size for BDAT command");
+ goto repeat_until_rset;
+ }
+
+ receive_getc = bdat_getc;
+ receive_ungetc = bdat_ungetc;
+#ifndef DISABLE_DKIM
+ dkim_collect_input = TRUE;
+#endif
+ break; /* to top of main loop */
+ }
+ }
+ }
+}
+
+void
+bdat_flush_data(void)
+{
+while (chunking_data_left > 0)
+ if (lwr_receive_getc(chunking_data_left--) < 0)
+ break;
+
+receive_getc = lwr_receive_getc;
+receive_ungetc = lwr_receive_ungetc;
+
+if (chunking_state != CHUNKING_LAST)
+ {
+ chunking_state = CHUNKING_OFFERED;
+ DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
+ }
+}
+
+
/*************************************************
int
smtp_ungetc(int ch)
{
-*(--smtp_inptr) = ch;
+*--smtp_inptr = ch;
return ch;
}
+int
+bdat_ungetc(int ch)
+{
+chunking_data_left++;
+return lwr_receive_ungetc(ch);
+}
+
/*************************************************
+/*************************************************
+* Test for characters in the SMTP buffer *
+*************************************************/
+
+/* Used at the end of a message
+
+Arguments: none
+Returns: TRUE/FALSE
+*/
+
+BOOL
+smtp_buffered(void)
+{
+return smtp_inptr < smtp_inend;
+}
+
+
/*************************************************
* Write formatted string to SMTP channel *
*/
void
-smtp_printf(char *format, ...)
+smtp_printf(const char *format, ...)
{
va_list ap;
+va_start(ap, format);
+smtp_vprintf(format, ap);
+va_end(ap);
+}
+
+/* This is split off so that verify.c:respond_printf() can, in effect, call
+smtp_printf(), bearing in mind that in C a vararg function can't directly
+call another vararg function, only a function which accepts a va_list. */
+
+void
+smtp_vprintf(const char *format, va_list ap)
+{
+BOOL yield;
+
+yield = string_vformat(big_buffer, big_buffer_size, format, ap);
+
DEBUG(D_receive)
{
- uschar *cr, *end;
- va_start(ap, format);
- (void) string_vformat(big_buffer, big_buffer_size, format, ap);
- va_end(ap);
- end = big_buffer + Ustrlen(big_buffer);
- while ((cr = Ustrchr(big_buffer, '\r')) != NULL) /* lose CRs */
- memmove(cr, cr + 1, (end--) - cr);
- debug_printf("SMTP>> %s", big_buffer);
+ void *reset_point = store_get(0);
+ uschar *msg_copy, *cr, *end;
+ msg_copy = string_copy(big_buffer);
+ end = msg_copy + Ustrlen(msg_copy);
+ while ((cr = Ustrchr(msg_copy, '\r')) != NULL) /* lose CRs */
+ memmove(cr, cr + 1, (end--) - cr);
+ debug_printf("SMTP>> %s", msg_copy);
+ store_reset(reset_point);
}
-va_start(ap, format);
+if (!yield)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf()");
+ smtp_closedown(US"Unexpected error");
+ exim_exit(EXIT_FAILURE);
+ }
+
+/* If this is the first output for a (non-batch) RCPT command, see if all RCPTs
+have had the same. Note: this code is also present in smtp_respond(). It would
+be tidier to have it only in one place, but when it was added, it was easier to
+do it that way, so as not to have to mess with the code for the RCPT command,
+which sometimes uses smtp_printf() and sometimes smtp_respond(). */
-/* If in a TLS session we have to format the string, and then write it using a
-TLS function. */
+if (rcpt_in_progress)
+ {
+ if (rcpt_smtp_response == NULL)
+ rcpt_smtp_response = string_copy(big_buffer);
+ else if (rcpt_smtp_response_same &&
+ Ustrcmp(rcpt_smtp_response, big_buffer) != 0)
+ rcpt_smtp_response_same = FALSE;
+ rcpt_in_progress = FALSE;
+ }
+
+/* Now write the string */
#ifdef SUPPORT_TLS
-if (tls_active >= 0)
+if (tls_in.active >= 0)
{
- if (!string_vformat(big_buffer, big_buffer_size, format, ap))
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf");
- smtp_closedown(US"Unexpected error");
- exim_exit(EXIT_FAILURE);
- }
- if (tls_write(big_buffer, Ustrlen(big_buffer)) < 0) smtp_write_error = -1;
+ if (tls_write(TRUE, big_buffer, Ustrlen(big_buffer)) < 0)
+ smtp_write_error = -1;
}
else
#endif
-/* Otherwise, just use the standard library function. */
-
-if (vfprintf(smtp_out, format, ap) < 0) smtp_write_error = -1;
-va_end(ap);
+if (fprintf(smtp_out, "%s", big_buffer) < 0) smtp_write_error = -1;
}
int
smtp_fflush(void)
{
-if (tls_active < 0 && fflush(smtp_out) != 0) smtp_write_error = -1;
+if (tls_in.active < 0 && fflush(smtp_out) != 0) smtp_write_error = -1;
return smtp_write_error;
}
sig = sig; /* Keep picky compilers happy */
log_write(L_lost_incoming_connection,
LOG_MAIN, "SMTP command timeout on%s connection from %s",
- (tls_active >= 0)? " TLS" : "",
+ (tls_in.active >= 0)? " TLS" : "",
host_and_ident(FALSE));
if (smtp_batched_input)
moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */
-smtp_printf("421 %s: SMTP command timeout - closing connection\r\n",
- smtp_active_hostname);
-mac_smtp_fflush();
+smtp_notquit_exit(US"command-timeout", US"421",
+ US"%s: SMTP command timeout - closing connection", smtp_active_hostname);
exim_exit(EXIT_FAILURE);
}
log_write(0, LOG_MAIN, "%s closed after SIGTERM", smtp_get_connection_info());
if (smtp_batched_input)
moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */
-smtp_printf("421 %s: Service not available - closing connection\r\n",
- smtp_active_hostname);
+smtp_notquit_exit(US"signal-exit", US"421",
+ US"%s: Service not available - closing connection", smtp_active_hostname);
exim_exit(EXIT_FAILURE);
}
+
+#ifdef SUPPORT_PROXY
+/*************************************************
+* Restore socket timeout to previous value *
+*************************************************/
+/* If the previous value was successfully retrieved, restore
+it before returning control to the non-proxy routines
+
+Arguments: fd - File descriptor for input
+ get_ok - Successfully retrieved previous values
+ tvtmp - Time struct with previous values
+ vslen - Length of time struct
+Returns: none
+*/
+static void
+restore_socket_timeout(int fd, int get_ok, struct timeval * tvtmp, socklen_t vslen)
+{
+if (get_ok == 0)
+ (void) setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS tvtmp, vslen);
+}
+
+/*************************************************
+* Check if host is required proxy host *
+*************************************************/
+/* The function determines if inbound host will be a regular smtp host
+or if it is configured that it must use Proxy Protocol. A local
+connection cannot.
+
+Arguments: none
+Returns: bool
+*/
+
+static BOOL
+check_proxy_protocol_host()
+{
+int rc;
+
+if ( sender_host_address
+ && (rc = verify_check_this_host(CUSS &hosts_proxy, NULL, NULL,
+ sender_host_address, NULL)) == OK)
+ {
+ DEBUG(D_receive)
+ debug_printf("Detected proxy protocol configured host\n");
+ proxy_session = TRUE;
+ }
+return proxy_session;
+}
+
+
+/*************************************************
+* Read data until newline or end of buffer *
+*************************************************/
+/* While SMTP is server-speaks-first, TLS is client-speaks-first, so we can't
+read an entire buffer and assume there will be nothing past a proxy protocol
+header. Our approach normally is to use stdio, but again that relies upon
+"STARTTLS\r\n" and a server response before the client starts TLS handshake, or
+reading _nothing_ before client TLS handshake. So we don't want to use the
+usual buffering reads which may read enough to block TLS starting.
+
+So unfortunately we're down to "read one byte at a time, with a syscall each,
+and expect a little overhead", for all proxy-opened connections which are v1,
+just to handle the TLS-on-connect case. Since SSL functions wrap the
+underlying fd, we can't assume that we can feed them any already-read content.
+
+We need to know where to read to, the max capacity, and we'll read until we
+get a CR and one more character. Let the caller scream if it's CR+!LF.
+
+Return the amount read.
+*/
+
+static int
+swallow_until_crlf(int fd, uschar *base, int already, int capacity)
+{
+ uschar *to = base + already;
+ uschar *cr;
+ int have = 0;
+ int ret;
+ int last = 0;
+
+ /* For "PROXY UNKNOWN\r\n" we, at time of writing, expect to have read
+ up through the \r; for the _normal_ case, we haven't yet seen the \r. */
+ cr = memchr(base, '\r', already);
+ if (cr != NULL)
+ {
+ if ((cr - base) < already - 1)
+ {
+ /* \r and presumed \n already within what we have; probably not
+ actually proxy protocol, but abort cleanly. */
+ return 0;
+ }
+ /* \r is last character read, just need one more. */
+ last = 1;
+ }
+
+ while (capacity > 0)
+ {
+ do { ret = recv(fd, to, 1, 0); } while (ret == -1 && errno == EINTR);
+ if (ret == -1)
+ return -1;
+ have++;
+ if (last)
+ return have;
+ if (*to == '\r')
+ last = 1;
+ capacity--;
+ to++;
+ }
+ // reached end without having room for a final newline, abort
+ errno = EOVERFLOW;
+ return -1;
+}
+
+/*************************************************
+* Setup host for proxy protocol *
+*************************************************/
+/* The function configures the connection based on a header from the
+inbound host to use Proxy Protocol. The specification is very exact
+so exit with an error if do not find the exact required pieces. This
+includes an incorrect number of spaces separating args.
+
+Arguments: none
+Returns: Boolean success
+*/
+
+static void
+setup_proxy_protocol_host()
+{
+union {
+ struct {
+ uschar line[108];
+ } v1;
+ struct {
+ uschar sig[12];
+ uint8_t ver_cmd;
+ uint8_t fam;
+ uint16_t len;
+ union {
+ struct { /* TCP/UDP over IPv4, len = 12 */
+ uint32_t src_addr;
+ uint32_t dst_addr;
+ uint16_t src_port;
+ uint16_t dst_port;
+ } ip4;
+ struct { /* TCP/UDP over IPv6, len = 36 */
+ uint8_t src_addr[16];
+ uint8_t dst_addr[16];
+ uint16_t src_port;
+ uint16_t dst_port;
+ } ip6;
+ struct { /* AF_UNIX sockets, len = 216 */
+ uschar src_addr[108];
+ uschar dst_addr[108];
+ } unx;
+ } addr;
+ } v2;
+} hdr;
+
+/* Temp variables used in PPv2 address:port parsing */
+uint16_t tmpport;
+char tmpip[INET_ADDRSTRLEN];
+struct sockaddr_in tmpaddr;
+char tmpip6[INET6_ADDRSTRLEN];
+struct sockaddr_in6 tmpaddr6;
+
+/* We can't read "all data until end" because while SMTP is
+server-speaks-first, the TLS handshake is client-speaks-first, so for
+TLS-on-connect ports the proxy protocol header will usually be immediately
+followed by a TLS handshake, and with N TLS libraries, we can't reliably
+reinject data for reading by those. So instead we first read "enough to be
+safely read within the header, and figure out how much more to read".
+For v1 we will later read to the end-of-line, for v2 we will read based upon
+the stated length.
+
+The v2 sig is 12 octets, and another 4 gets us the length, so we know how much
+data is needed total. For v1, where the line looks like:
+PROXY TCPn L3src L3dest SrcPort DestPort \r\n
+
+However, for v1 there's also `PROXY UNKNOWN\r\n` which is only 15 octets.
+We seem to support that. So, if we read 14 octets then we can tell if we're
+v2 or v1. If we're v1, we can continue reading as normal.
+
+If we're v2, we can't slurp up the entire header. We need the length in the
+15th & 16th octets, then to read everything after that.
+
+So to safely handle v1 and v2, with client-sent-first supported correctly,
+we have to do a minimum of 3 read calls, not 1. Eww.
+*/
+
+#define PROXY_INITIAL_READ 14
+#define PROXY_V2_HEADER_SIZE 16
+#if PROXY_INITIAL_READ > PROXY_V2_HEADER_SIZE
+# error Code bug in sizes of data to read for proxy usage
+#endif
+
+int get_ok = 0;
+int size, ret;
+int fd = fileno(smtp_in);
+const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";
+uschar * iptype; /* To display debug info */
+struct timeval tv;
+struct timeval tvtmp;
+socklen_t vslen = sizeof(struct timeval);
+BOOL yield = FALSE;
+
+/* Save current socket timeout values */
+get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tvtmp, &vslen);
+
+/* Proxy Protocol host must send header within a short time
+(default 3 seconds) or it's considered invalid */
+tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC;
+tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC;
+if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tv, sizeof(tv)) < 0)
+ goto bad;
+
+do
+ {
+ /* The inbound host was declared to be a Proxy Protocol host, so
+ don't do a PEEK into the data, actually slurp up enough to be
+ "safe". Can't take it all because TLS-on-connect clients follow
+ immediately with TLS handshake. */
+ ret = recv(fd, &hdr, PROXY_INITIAL_READ, 0);
+ }
+ while (ret == -1 && errno == EINTR);
+
+if (ret == -1)
+ goto proxyfail;
+
+/* For v2, handle reading the length, and then the rest. */
+if ((ret == PROXY_INITIAL_READ) && (memcmp(&hdr.v2, v2sig, sizeof(v2sig)) == 0))
+ {
+ int retmore;
+ uint8_t ver;
+
+ /* First get the length fields. */
+ do
+ {
+ retmore = recv(fd, (uschar*)&hdr + ret, PROXY_V2_HEADER_SIZE - PROXY_INITIAL_READ, 0);
+ } while (retmore == -1 && errno == EINTR);
+ if (retmore == -1)
+ goto proxyfail;
+ ret += retmore;
+
+ ver = (hdr.v2.ver_cmd & 0xf0) >> 4;
+
+ /* May 2014: haproxy combined the version and command into one byte to
+ allow two full bytes for the length field in order to proxy SSL
+ connections. SSL Proxy is not supported in this version of Exim, but
+ must still separate values here. */
+
+ if (ver != 0x02)
+ {
+ DEBUG(D_receive) debug_printf("Invalid Proxy Protocol version: %d\n", ver);
+ goto proxyfail;
+ }
+
+ /* The v2 header will always be 16 bytes per the spec. */
+ size = 16 + ntohs(hdr.v2.len);
+ DEBUG(D_receive) debug_printf("Detected PROXYv2 header, size %d (limit %d)\n",
+ size, (int)sizeof(hdr));
+
+ /* We should now have 16 octets (PROXY_V2_HEADER_SIZE), and we know the total
+ amount that we need. Double-check that the size is not unreasonable, then
+ get the rest. */
+ if (size > sizeof(hdr))
+ {
+ DEBUG(D_receive) debug_printf("PROXYv2 header size unreasonably large; security attack?\n");
+ goto proxyfail;
+ }
+
+ do
+ {
+ do
+ {
+ retmore = recv(fd, (uschar*)&hdr + ret, size-ret, 0);
+ } while (retmore == -1 && errno == EINTR);
+ if (retmore == -1)
+ goto proxyfail;
+ ret += retmore;
+ DEBUG(D_receive) debug_printf("PROXYv2: have %d/%d required octets\n", ret, size);
+ } while (ret < size);
+
+ } /* end scope for getting rest of data for v2 */
+
+/* At this point: if PROXYv2, we've read the exact size required for all data;
+if PROXYv1 then we've read "less than required for any valid line" and should
+read the rest". */
+
+if (ret >= 16 && memcmp(&hdr.v2, v2sig, 12) == 0)
+ {
+ uint8_t cmd = (hdr.v2.ver_cmd & 0x0f);
+
+ switch (cmd)
+ {
+ case 0x01: /* PROXY command */
+ switch (hdr.v2.fam)
+ {
+ case 0x11: /* TCPv4 address type */
+ iptype = US"IPv4";
+ tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr;
+ inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
+ if (!string_is_ip_address(US tmpip, NULL))
+ {
+ DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
+ goto proxyfail;
+ }
+ proxy_local_address = sender_host_address;
+ sender_host_address = string_copy(US tmpip);
+ tmpport = ntohs(hdr.v2.addr.ip4.src_port);
+ proxy_local_port = sender_host_port;
+ sender_host_port = tmpport;
+ /* Save dest ip/port */
+ tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr;
+ inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
+ if (!string_is_ip_address(US tmpip, NULL))
+ {
+ DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
+ goto proxyfail;
+ }
+ proxy_external_address = string_copy(US tmpip);
+ tmpport = ntohs(hdr.v2.addr.ip4.dst_port);
+ proxy_external_port = tmpport;
+ goto done;
+ case 0x21: /* TCPv6 address type */
+ iptype = US"IPv6";
+ memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16);
+ inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
+ if (!string_is_ip_address(US tmpip6, NULL))
+ {
+ DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
+ goto proxyfail;
+ }
+ proxy_local_address = sender_host_address;
+ sender_host_address = string_copy(US tmpip6);
+ tmpport = ntohs(hdr.v2.addr.ip6.src_port);
+ proxy_local_port = sender_host_port;
+ sender_host_port = tmpport;
+ /* Save dest ip/port */
+ memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16);
+ inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
+ if (!string_is_ip_address(US tmpip6, NULL))
+ {
+ DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
+ goto proxyfail;
+ }
+ proxy_external_address = string_copy(US tmpip6);
+ tmpport = ntohs(hdr.v2.addr.ip6.dst_port);
+ proxy_external_port = tmpport;
+ goto done;
+ default:
+ DEBUG(D_receive)
+ debug_printf("Unsupported PROXYv2 connection type: 0x%02x\n",
+ hdr.v2.fam);
+ goto proxyfail;
+ }
+ /* Unsupported protocol, keep local connection address */
+ break;
+ case 0x00: /* LOCAL command */
+ /* Keep local connection address for LOCAL */
+ iptype = US"local";
+ break;
+ default:
+ DEBUG(D_receive)
+ debug_printf("Unsupported PROXYv2 command: 0x%x\n", cmd);
+ goto proxyfail;
+ }
+ }
+else if (ret >= 8 && memcmp(hdr.v1.line, "PROXY", 5) == 0)
+ {
+ uschar *p;
+ uschar *end;
+ uschar *sp; /* Utility variables follow */
+ int tmp_port;
+ int r2;
+ char *endc;
+
+ /* get the rest of the line */
+ r2 = swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret);
+ if (r2 == -1)
+ goto proxyfail;
+ ret += r2;
+
+ p = string_copy(hdr.v1.line);
+ end = memchr(p, '\r', ret - 1);
+
+ if (!end || (end == (uschar*)&hdr + ret) || end[1] != '\n')
+ {
+ DEBUG(D_receive) debug_printf("Partial or invalid PROXY header\n");
+ goto proxyfail;
+ }
+ *end = '\0'; /* Terminate the string */
+ size = end + 2 - p; /* Skip header + CRLF */
+ DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n");
+ DEBUG(D_receive) debug_printf("Bytes read not within PROXY header: %d\n", ret - size);
+ /* Step through the string looking for the required fields. Ensure
+ strict adherence to required formatting, exit for any error. */
+ p += 5;
+ if (!isspace(*(p++)))
+ {
+ DEBUG(D_receive) debug_printf("Missing space after PROXY command\n");
+ goto proxyfail;
+ }
+ if (!Ustrncmp(p, CCS"TCP4", 4))
+ iptype = US"IPv4";
+ else if (!Ustrncmp(p,CCS"TCP6", 4))
+ iptype = US"IPv6";
+ else if (!Ustrncmp(p,CCS"UNKNOWN", 7))
+ {
+ iptype = US"Unknown";
+ goto done;
+ }
+ else
+ {
+ DEBUG(D_receive) debug_printf("Invalid TCP type\n");
+ goto proxyfail;
+ }
+
+ p += Ustrlen(iptype);
+ if (!isspace(*(p++)))
+ {
+ DEBUG(D_receive) debug_printf("Missing space after TCP4/6 command\n");
+ goto proxyfail;
+ }
+ /* Find the end of the arg */
+ if ((sp = Ustrchr(p, ' ')) == NULL)
+ {
+ DEBUG(D_receive)
+ debug_printf("Did not find proxied src %s\n", iptype);
+ goto proxyfail;
+ }
+ *sp = '\0';
+ if(!string_is_ip_address(p, NULL))
+ {
+ DEBUG(D_receive)
+ debug_printf("Proxied src arg is not an %s address\n", iptype);
+ goto proxyfail;
+ }
+ proxy_local_address = sender_host_address;
+ sender_host_address = p;
+ p = sp + 1;
+ if ((sp = Ustrchr(p, ' ')) == NULL)
+ {
+ DEBUG(D_receive)
+ debug_printf("Did not find proxy dest %s\n", iptype);
+ goto proxyfail;
+ }
+ *sp = '\0';
+ if(!string_is_ip_address(p, NULL))
+ {
+ DEBUG(D_receive)
+ debug_printf("Proxy dest arg is not an %s address\n", iptype);
+ goto proxyfail;
+ }
+ proxy_external_address = p;
+ p = sp + 1;
+ if ((sp = Ustrchr(p, ' ')) == NULL)
+ {
+ DEBUG(D_receive) debug_printf("Did not find proxied src port\n");
+ goto proxyfail;
+ }
+ *sp = '\0';
+ tmp_port = strtol(CCS p, &endc, 10);
+ if (*endc || tmp_port == 0)
+ {
+ DEBUG(D_receive)
+ debug_printf("Proxied src port '%s' not an integer\n", p);
+ goto proxyfail;
+ }
+ proxy_local_port = sender_host_port;
+ sender_host_port = tmp_port;
+ p = sp + 1;
+ if ((sp = Ustrchr(p, '\0')) == NULL)
+ {
+ DEBUG(D_receive) debug_printf("Did not find proxy dest port\n");
+ goto proxyfail;
+ }
+ tmp_port = strtol(CCS p, &endc, 10);
+ if (*endc || tmp_port == 0)
+ {
+ DEBUG(D_receive)
+ debug_printf("Proxy dest port '%s' not an integer\n", p);
+ goto proxyfail;
+ }
+ proxy_external_port = tmp_port;
+ /* Already checked for /r /n above. Good V1 header received. */
+ }
+else
+ {
+ /* Wrong protocol */
+ DEBUG(D_receive) debug_printf("Invalid proxy protocol version negotiation\n");
+ (void) swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret);
+ goto proxyfail;
+ }
+
+done:
+ DEBUG(D_receive)
+ debug_printf("Valid %s sender from Proxy Protocol header\n", iptype);
+ yield = proxy_session;
+
+/* Don't flush any potential buffer contents. Any input on proxyfail
+should cause a synchronization failure */
+
+proxyfail:
+ restore_socket_timeout(fd, get_ok, &tvtmp, vslen);
+
+bad:
+ if (yield)
+ {
+ sender_host_name = NULL;
+ (void) host_name_lookup();
+ host_build_sender_fullhost();
+ }
+ else
+ {
+ proxy_session_failed = TRUE;
+ DEBUG(D_receive)
+ debug_printf("Failure to extract proxied host, only QUIT allowed\n");
+ }
+
+return;
+}
+#endif
+
/*************************************************
* Read one command line *
*************************************************/
return when it runs.
Arguments:
- check_sync if TRUE, check synchronization rules if global option is TRUE
+ check_sync if TRUE, check synchronization rules if global option is TRUE
+ buffer_lim maximum to buffer in lower layer
Returns: a code identifying the command (enumerated above)
*/
static int
-smtp_read_command(BOOL check_sync)
+smtp_read_command(BOOL check_sync, unsigned buffer_lim)
{
int c;
int ptr = 0;
os_non_restarting_signal(SIGALRM, command_timeout_handler);
-while ((c = (receive_getc)()) != '\n' && c != EOF)
+while ((c = (receive_getc)(buffer_lim)) != '\n' && c != EOF)
{
- if (ptr >= smtp_cmd_buffer_size)
+ if (ptr >= SMTP_CMD_BUFFER_SIZE)
{
os_non_restarting_signal(SIGALRM, sigalrm_handler);
return OTHER_CMD;
for (p = cmd_list; p < cmd_list_end; p++)
{
- if (strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0 &&
- (smtp_cmd_buffer[p->len-1] == ':' || /* "mail from:" or "rcpt to:" */
- smtp_cmd_buffer[p->len] == 0 ||
- smtp_cmd_buffer[p->len] == ' '))
+#ifdef SUPPORT_PROXY
+ /* Only allow QUIT command if Proxy Protocol parsing failed */
+ if (proxy_session && proxy_session_failed && p->cmd != QUIT_CMD)
+ continue;
+#endif
+ if ( p->len
+ && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0
+ && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */
+ || smtp_cmd_buffer[p->len] == 0
+ || smtp_cmd_buffer[p->len] == ' '
+ ) )
{
if (smtp_inptr < smtp_inend && /* Outstanding input */
p->cmd < sync_cmd_limit && /* Command should sync */
!sender_host_notsocket) /* Really is a socket */
return BADSYN_CMD;
- /* Point after the command, but don't skip over leading spaces till after
- the following test, so that if it fails, the command name can easily be
- logged. */
+ /* The variables $smtp_command and $smtp_command_argument point into the
+ unmodified input buffer. A copy of the latter is taken for actual
+ processing, so that it can be chopped up into separate parts if necessary,
+ for example, when processing a MAIL command options such as SIZE that can
+ follow the sender address. */
smtp_cmd_argument = smtp_cmd_buffer + p->len;
+ while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++;
+ Ustrcpy(smtp_data_buffer, smtp_cmd_argument);
+ smtp_cmd_data = smtp_data_buffer;
/* Count non-mail commands from those hosts that are controlled in this
way. The default is all hosts. We don't waste effort checking the list
return TOO_MANY_NONMAIL_CMD;
}
- /* Get the data pointer over leading spaces and return; if there is data
- for a command that does not expect it, give the error centrally here. */
+ /* If there is data for a command that does not expect it, generate the
+ error here. */
- while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++;
- return (p->has_arg || *smtp_cmd_argument == 0)? p->cmd : BADARG_CMD;
+ return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD;
}
}
+#ifdef SUPPORT_PROXY
+/* Only allow QUIT command if Proxy Protocol parsing failed */
+if (proxy_session && proxy_session_failed)
+ return PROXY_FAIL_IGNORE_CMD;
+#endif
+
/* Enforce synchronization for unknown commands */
if (smtp_inptr < smtp_inend && /* Outstanding input */
except QUIT. The existence of an SMTP call is detected by the non-NULLness of
smtp_in.
-Argument: SMTP reply string to send, excluding the code
+Arguments:
+ message SMTP reply string to send, excluding the code
+
Returns: nothing
*/
receive_swallow_smtp();
smtp_printf("421 %s\r\n", message);
-for (;;)
+for (;;) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
{
- switch(smtp_read_command(FALSE))
- {
- case EOF_CMD:
- return;
+ case EOF_CMD:
+ return;
- case QUIT_CMD:
- smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
- mac_smtp_fflush();
- return;
+ case QUIT_CMD:
+ smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
+ mac_smtp_fflush();
+ return;
- case RSET_CMD:
- smtp_printf("250 Reset OK\r\n");
- break;
+ case RSET_CMD:
+ smtp_printf("250 Reset OK\r\n");
+ break;
- default:
- smtp_printf("421 %s\r\n", message);
- break;
- }
+ default:
+ smtp_printf("421 %s\r\n", message);
+ break;
}
}
uschar *
smtp_get_connection_info(void)
{
-uschar *hostname = (sender_fullhost == NULL)?
- sender_host_address : sender_fullhost;
+const uschar * hostname = sender_fullhost
+ ? sender_fullhost : sender_host_address;
if (host_checking)
return string_sprintf("SMTP connection from %s", hostname);
if (is_inetd)
return string_sprintf("SMTP connection from %s (via inetd)", hostname);
-if ((log_extra_selector & LX_incoming_interface) != 0 &&
- interface_address != NULL)
+if (LOGGING(incoming_interface) && interface_address != NULL)
return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname,
interface_address, interface_port);
+#ifdef SUPPORT_TLS
+/* Append TLS-related information to a log line
+
+Arguments:
+ s String under construction: allocated string to extend, or NULL
+ sizep Pointer to current allocation size (update on return), or NULL
+ ptrp Pointer to index for new entries in string (update on return), or NULL
+
+Returns: Allocated string or NULL
+*/
+static uschar *
+s_tlslog(uschar * s, int * sizep, int * ptrp)
+{
+ int size = sizep ? *sizep : 0;
+ int ptr = ptrp ? *ptrp : 0;
+
+ if (LOGGING(tls_cipher) && tls_in.cipher != NULL)
+ s = string_append(s, &size, &ptr, 2, US" X=", tls_in.cipher);
+ if (LOGGING(tls_certificate_verified) && tls_in.cipher != NULL)
+ s = string_append(s, &size, &ptr, 2, US" CV=",
+ tls_in.certificate_verified? "yes":"no");
+ if (LOGGING(tls_peerdn) && tls_in.peerdn != NULL)
+ s = string_append(s, &size, &ptr, 3, US" DN=\"",
+ string_printing(tls_in.peerdn), US"\"");
+ if (LOGGING(tls_sni) && tls_in.sni != NULL)
+ s = string_append(s, &size, &ptr, 3, US" SNI=\"",
+ string_printing(tls_in.sni), US"\"");
+
+ if (s)
+ {
+ s[ptr] = '\0';
+ if (sizep) *sizep = size;
+ if (ptrp) *ptrp = ptr;
+ }
+ return s;
+}
+#endif
+
+/*************************************************
+* Log lack of MAIL if so configured *
+*************************************************/
+
+/* This function is called when an SMTP session ends. If the log selector
+smtp_no_mail is set, write a log line giving some details of what has happened
+in the SMTP session.
+
+Arguments: none
+Returns: nothing
+*/
+
+void
+smtp_log_no_mail(void)
+{
+int size, ptr, i;
+uschar *s, *sep;
+
+if (smtp_mailcmd_count > 0 || !LOGGING(smtp_no_mail))
+ return;
+
+s = NULL;
+size = ptr = 0;
+
+if (sender_host_authenticated != NULL)
+ {
+ s = string_append(s, &size, &ptr, 2, US" A=", sender_host_authenticated);
+ if (authenticated_id != NULL)
+ s = string_append(s, &size, &ptr, 2, US":", authenticated_id);
+ }
+
+#ifdef SUPPORT_TLS
+s = s_tlslog(s, &size, &ptr);
+#endif
+
+sep = (smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE)?
+ US" C=..." : US" C=";
+for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++)
+ {
+ if (smtp_connection_had[i] != SCH_NONE)
+ {
+ s = string_append(s, &size, &ptr, 2, sep,
+ smtp_names[smtp_connection_had[i]]);
+ sep = US",";
+ }
+ }
+
+for (i = 0; i < smtp_ch_index; i++)
+ {
+ s = string_append(s, &size, &ptr, 2, sep, smtp_names[smtp_connection_had[i]]);
+ sep = US",";
+ }
+
+if (s != NULL) s[ptr] = 0; else s = US"";
+log_write(0, LOG_MAIN, "no MAIL in SMTP connection from %s D=%s%s",
+ host_and_ident(FALSE),
+ readconf_printtime( (int) ((long)time(NULL) - (long)smtp_connection_start)),
+ s);
+}
+
+
+
/*************************************************
* Check HELO line and set sender_helo_name *
*************************************************/
/* Check the format of a HELO line. The data for HELO/EHLO is supposed to be
the domain name of the sending host, or an ip literal in square brackets. The
-arrgument is placed in sender_helo_name, which is in malloc store, because it
+argument is placed in sender_helo_name, which is in malloc store, because it
must persist over multiple incoming messages. If helo_accept_junk is set, this
host is permitted to send any old junk (needed for some broken hosts).
Otherwise, helo_allow_chars can be used for rogue characters in general
* Extract SMTP command option *
*************************************************/
-/* This function picks the next option setting off the end of smtp_cmd_argument. It
+/* This function picks the next option setting off the end of smtp_cmd_data. It
is called for MAIL FROM and RCPT TO commands, to pick off the optional ESMTP
things that can appear there.
extract_option(uschar **name, uschar **value)
{
uschar *n;
-uschar *v = smtp_cmd_argument + Ustrlen(smtp_cmd_argument) -1;
+uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1;
while (isspace(*v)) v--;
v[1] = 0;
+while (v > smtp_cmd_data && *v != '=' && !isspace(*v))
+ {
+ /* Take care to not stop at a space embedded in a quoted local-part */
-while (v > smtp_cmd_argument && *v != '=' && !isspace(*v)) v--;
-if (*v != '=') return FALSE;
+ if (*v == '"') do v--; while (*v != '"' && v > smtp_cmd_data+1);
+ v--;
+ }
n = v;
-while(isalpha(n[-1])) n--;
-
-if (n[-1] != ' ') return FALSE;
-
-n[-1] = 0;
-*name = n;
+if (*v == '=')
+{
+ while(isalpha(n[-1])) n--;
+ /* RFC says SP, but TAB seen in wild and other major MTAs accept it */
+ if (!isspace(n[-1])) return FALSE;
+ n[-1] = 0;
+}
+else
+{
+ n++;
+ if (v == smtp_cmd_data) return FALSE;
+}
*v++ = 0;
+*name = n;
*value = v;
return TRUE;
}
-
-
/*************************************************
* Reset for new message *
*************************************************/
static void
smtp_reset(void *reset_point)
{
-int i;
-store_reset(reset_point);
recipients_list = NULL;
rcpt_count = rcpt_defer_count = rcpt_fail_count =
raw_recipients_count = recipients_count = recipients_list_max = 0;
+cancel_cutthrough_connection("smtp reset");
message_linecount = 0;
message_size = -1;
acl_added_headers = NULL;
+acl_removed_headers = NULL;
queue_only_policy = FALSE;
+rcpt_smtp_response = NULL;
+rcpt_smtp_response_same = TRUE;
+rcpt_in_progress = FALSE;
deliver_freeze = FALSE; /* Can be set by ACL */
freeze_tell = freeze_tell_config; /* Can be set by ACL */
fake_response = OK; /* Can be set by ACL */
no_mbox_unspool = FALSE; /* Can be set by ACL */
#endif
submission_mode = FALSE; /* Can be set by ACL */
-suppress_local_fixups = FALSE; /* Can be set by ACL */
+suppress_local_fixups = suppress_local_fixups_default; /* Can be set by ACL */
active_local_from_check = local_from_check; /* Can be set by ACL */
active_local_sender_retain = local_sender_retain; /* Can be set by ACL */
-sender_address = NULL;
+sending_ip_address = NULL;
+return_path = sender_address = NULL;
+sender_data = NULL; /* Can be set by ACL */
+deliver_localpart_orig = NULL;
+deliver_domain_orig = NULL;
+callout_address = NULL;
submission_name = NULL; /* Can be set by ACL */
raw_sender = NULL; /* After SMTP rewrite, before qualifying */
sender_address_unrewritten = NULL; /* Set only after verify rewrite */
sender_verified_list = NULL; /* No senders verified */
memset(sender_address_cache, 0, sizeof(sender_address_cache));
memset(sender_domain_cache, 0, sizeof(sender_domain_cache));
+
authenticated_sender = NULL;
#ifdef EXPERIMENTAL_BRIGHTMAIL
bmi_run = 0;
bmi_verdicts = NULL;
#endif
-#ifdef EXPERIMENTAL_DOMAINKEYS
-dk_do_verify = 0;
+dnslist_domain = dnslist_matched = NULL;
+#ifndef DISABLE_DKIM
+dkim_signers = NULL;
+dkim_disable_verify = FALSE;
+dkim_collect_input = FALSE;
+#endif
+dsn_ret = 0;
+dsn_envid = NULL;
+deliver_host = deliver_host_address = NULL; /* Can be set by ACL */
+#ifndef DISABLE_PRDR
+prdr_requested = FALSE;
#endif
#ifdef EXPERIMENTAL_SPF
spf_header_comment = NULL;
spf_result = NULL;
spf_smtp_comment = NULL;
#endif
+#ifdef SUPPORT_I18N
+message_smtputf8 = FALSE;
+#endif
body_linecount = body_zerocount = 0;
sender_rate = sender_rate_limit = sender_rate_period = NULL;
ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */
/* Note that ratelimiters_conn persists across resets. */
-/* The message variables follow the connection variables. */
+/* Reset message ACL variables */
-for (i = 0; i < ACL_MVARS; i++) acl_var[ACL_CVARS + i] = NULL;
+acl_var_m = NULL;
/* The message body variables use malloc store. They may be set if this is
not the first message in an SMTP session and the previous message caused them
to be referenced in an ACL. */
-if (message_body != NULL)
+if (message_body)
{
store_free(message_body);
message_body = NULL;
}
-if (message_body_end != NULL)
+if (message_body_end)
{
store_free(message_body_end);
message_body_end = NULL;
/* Warning log messages are also saved in malloc store. They are saved to avoid
repetition in the same message, but it seems right to repeat them for different
-messagess. */
+messages. */
-while (acl_warn_logged != NULL)
+while (acl_warn_logged)
{
string_item *this = acl_warn_logged;
acl_warn_logged = acl_warn_logged->next;
store_free(this);
}
+store_reset(reset_point);
}
uschar *recipient = NULL;
int start, end, sender_domain, recipient_domain;
- switch(smtp_read_command(FALSE))
+ switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
{
/* The HELO/EHLO commands set sender_address_helo if they have
valid data; otherwise they are ignored, except that they do
case HELO_CMD:
case EHLO_CMD:
- check_helo(smtp_cmd_argument);
+ check_helo(smtp_cmd_data);
/* Fall through */
case RSET_CMD:
it is the canonical extracted address which is all that is kept. */
case MAIL_CMD:
+ smtp_mailcmd_count++; /* Count for no-mail log */
if (sender_address != NULL)
/* The function moan_smtp_batch() does not return. */
moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given");
- if (smtp_cmd_argument[0] == 0)
+ if (smtp_cmd_data[0] == 0)
/* The function moan_smtp_batch() does not return. */
moan_smtp_batch(smtp_cmd_buffer, "501 MAIL FROM must have an address operand");
/* Apply SMTP rewrite */
raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_cmd_argument, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE,
- US"", global_rewrite_rules) : smtp_cmd_argument;
+ rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE,
+ US"", global_rewrite_rules) : smtp_cmd_data;
/* Extract the address; the TRUE flag allows <> as valid */
/* The function moan_smtp_batch() does not return. */
moan_smtp_batch(smtp_cmd_buffer, "503 No sender yet given");
- if (smtp_cmd_argument[0] == 0)
+ if (smtp_cmd_data[0] == 0)
/* The function moan_smtp_batch() does not return. */
moan_smtp_batch(smtp_cmd_buffer, "501 RCPT TO must have an address operand");
/* Apply SMTP rewrite, then extract address. Don't allow "<>" as a
recipient address */
- recipient = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_cmd_argument, rewrite_smtp, NULL, FALSE, US"",
- global_rewrite_rules) : smtp_cmd_argument;
+ recipient = rewrite_existflags & rewrite_smtp
+ ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
+ global_rewrite_rules)
+ : smtp_cmd_data;
- /* rfc821_domains = TRUE; << no longer needed */
recipient = parse_extract_address(recipient, &errmess, &start, &end,
&recipient_domain, FALSE);
- /* rfc821_domains = FALSE; << no longer needed */
- if (recipient == NULL)
+ if (!recipient)
/* The function moan_smtp_batch() does not return. */
moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess);
+static BOOL
+smtp_log_tls_fail(uschar * errstr)
+{
+uschar * conn_info = smtp_get_connection_info();
+
+if (Ustrncmp(conn_info, US"SMTP ", 5) == 0) conn_info += 5;
+/* I'd like to get separated H= here, but too hard for now */
+
+log_write(0, LOG_MAIN, "TLS error on %s %s", conn_info, errstr);
+return FALSE;
+}
+
+
/*************************************************
* Start an SMTP session *
*************************************************/
smtp_start_session(void)
{
int size = 256;
-int i, ptr;
+int ptr, esclen;
+uschar *user_msg, *log_msg;
+uschar *code, *esc;
uschar *p, *s, *ss;
+smtp_connection_start = time(NULL);
+for (smtp_ch_index = 0; smtp_ch_index < SMTP_HBUFF_SIZE; smtp_ch_index++)
+ smtp_connection_had[smtp_ch_index] = SCH_NONE;
+smtp_ch_index = 0;
+
/* Default values for certain variables */
helo_seen = esmtp = helo_accept_junk = FALSE;
+smtp_mailcmd_count = 0;
count_nonmail = TRUE_UNSET;
synprot_error_count = unknown_command_count = nonmail_command_count = 0;
smtp_delay_mail = smtp_rlm_base;
auth_advertised = FALSE;
pipelining_advertised = FALSE;
+pipelining_enable = TRUE;
sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING;
-
-memset(sender_host_cache, 0, sizeof(sender_host_cache));
+smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */
/* If receiving by -bs from a trusted user, or testing with -bh, we allow
authentication settings from -oMaa to remain in force. */
authenticated_by = NULL;
#ifdef SUPPORT_TLS
-tls_cipher = tls_peerdn = NULL;
+tls_in.cipher = tls_in.peerdn = NULL;
+tls_in.ourcert = tls_in.peercert = NULL;
+tls_in.sni = NULL;
+tls_in.ocsp = OCSP_NOT_REQ;
tls_advertised = FALSE;
#endif
+dsn_advertised = FALSE;
+#ifdef SUPPORT_I18N
+smtputf8_advertised = FALSE;
+#endif
/* Reset ACL connection variables */
-for (i = 0; i < ACL_CVARS; i++) acl_var[i] = NULL;
+acl_var_c = NULL;
-/* Allow for trailing 0 in the command buffer. */
+/* Allow for trailing 0 in the command and data buffers. */
-smtp_cmd_buffer = (uschar *)malloc(smtp_cmd_buffer_size + 1);
-if (smtp_cmd_buffer == NULL)
+if (!(smtp_cmd_buffer = US malloc(2*SMTP_CMD_BUFFER_SIZE + 2)))
log_write(0, LOG_MAIN|LOG_PANIC_DIE,
"malloc() failed for SMTP command buffer");
+smtp_cmd_buffer[0] = 0;
+smtp_data_buffer = smtp_cmd_buffer + SMTP_CMD_BUFFER_SIZE + 1;
+
/* For batched input, the protocol setting can be overridden from the
command line by a trusted caller. */
if (smtp_batched_input)
{
- if (received_protocol == NULL) received_protocol = US"local-bsmtp";
+ if (!received_protocol) received_protocol = US"local-bsmtp";
}
/* For non-batched SMTP input, the protocol setting is forced here. It will be
else
received_protocol =
- protocols[pnormal] + ((sender_host_address != NULL)? pnlocal : 0);
+ (sender_host_address ? protocols : protocols_local) [pnormal];
/* Set up the buffer for inputting using direct read() calls, and arrange to
call the local functions instead of the standard C ones. */
-smtp_inbuffer = (uschar *)malloc(in_buffer_size);
-if (smtp_inbuffer == NULL)
+if (!(smtp_inbuffer = (uschar *)malloc(IN_BUFFER_SIZE)))
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer");
+
receive_getc = smtp_getc;
+receive_get_cache = smtp_get_cache;
receive_ungetc = smtp_ungetc;
receive_feof = smtp_feof;
receive_ferror = smtp_ferror;
+receive_smtp_buffered = smtp_buffered;
smtp_inptr = smtp_inend = smtp_inbuffer;
smtp_had_eof = smtp_had_error = 0;
/* Set up the message size limit; this may be host-specific */
-thismessage_size_limit = expand_string_integer(message_size_limit);
-if (thismessage_size_limit < 0)
+thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
+if (expand_string_message != NULL)
{
if (thismessage_size_limit == -1)
log_write(0, LOG_MAIN|LOG_PANIC, "unable to expand message_size_limit: "
set_process_info("handling incoming connection from %s",
host_and_ident(FALSE));
- /* Start up TLS if tls_on_connect is set. This is for supporting the legacy
- smtps port for use with older style SSL MTAs. */
+ /* Expand smtp_receive_timeout, if needed */
- #ifdef SUPPORT_TLS
- if (tls_on_connect && tls_server_start(tls_require_ciphers) != OK)
- return FALSE;
- #endif
+ if (smtp_receive_timeout_s)
+ {
+ uschar * exp;
+ if ( !(exp = expand_string(smtp_receive_timeout_s))
+ || !(*exp)
+ || (smtp_receive_timeout = readconf_readtime(exp, 0, FALSE)) < 0
+ )
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "bad value for smtp_receive_timeout: '%s'", exp ? exp : US"");
+ }
/* Test for explicit connection rejection */
value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does
not exist). */
- #ifdef USE_TCP_WRAPPERS
+#ifdef USE_TCP_WRAPPERS
errno = 0;
- if (!hosts_ctl("exim",
- (sender_host_name == NULL)? STRING_UNKNOWN : CS sender_host_name,
- (sender_host_address == NULL)? STRING_UNKNOWN : CS sender_host_address,
- (sender_ident == NULL)? STRING_UNKNOWN : CS sender_ident))
+ if (!(tcp_wrappers_name = expand_string(tcp_wrappers_daemon_name)))
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
+ "(tcp_wrappers_name) failed: %s", string_printing(tcp_wrappers_name),
+ expand_string_message);
+
+ if (!hosts_ctl(tcp_wrappers_name,
+ sender_host_name ? CS sender_host_name : STRING_UNKNOWN,
+ sender_host_address ? CS sender_host_address : STRING_UNKNOWN,
+ sender_ident ? CS sender_ident : STRING_UNKNOWN))
{
if (errno == 0 || errno == ENOENT)
{
}
return FALSE;
}
- #endif
+#endif
- /* Check for reserved slots. Note that the count value doesn't include
- this process, as it gets upped in the parent process. */
+ /* Check for reserved slots. The value of smtp_accept_count has already been
+ incremented to include this process. */
if (smtp_accept_max > 0 &&
- smtp_accept_count + 1 > smtp_accept_max - smtp_accept_reserve)
+ smtp_accept_count > smtp_accept_max - smtp_accept_reserve)
{
if ((rc = verify_check_host(&smtp_reserve_hosts)) != OK)
{
log_write(L_connection_reject,
LOG_MAIN, "temporarily refused connection from %s: not in "
"reserve list: connected=%d max=%d reserve=%d%s",
- host_and_ident(FALSE), smtp_accept_count, smtp_accept_max,
+ host_and_ident(FALSE), smtp_accept_count - 1, smtp_accept_max,
smtp_accept_reserve, (rc == DEFER)? " (lookup deferred)" : "");
smtp_printf("421 %s: Too many concurrent SMTP connections; "
"please try again later\r\n", smtp_active_hostname);
if (smtp_batched_input) return TRUE;
-/* Run the ACL if it exists */
+/* If valid Proxy Protocol source is connecting, set up session.
+ * Failure will not allow any SMTP function other than QUIT. */
+
+#ifdef SUPPORT_PROXY
+proxy_session = FALSE;
+proxy_session_failed = FALSE;
+if (check_proxy_protocol_host())
+ setup_proxy_protocol_host();
+#endif
+
+ /* Start up TLS if tls_on_connect is set. This is for supporting the legacy
+ smtps port for use with older style SSL MTAs. */
+
+#ifdef SUPPORT_TLS
+ if (tls_in.on_connect && tls_server_start(tls_require_ciphers, &user_msg) != OK)
+ return smtp_log_tls_fail(user_msg);
+#endif
+
+/* Run the connect ACL if it exists */
-if (acl_smtp_connect != NULL)
+user_msg = NULL;
+if (acl_smtp_connect)
{
int rc;
- uschar *user_msg, *log_msg;
- rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg,
- &log_msg);
- if (rc != OK)
+ if ((rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg,
+ &log_msg)) != OK)
{
- (void)smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg);
+ (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg);
return FALSE;
}
}
/* Output the initial message for a two-way SMTP connection. It may contain
newlines, which then cause a multi-line response to be given. */
-s = expand_string(smtp_banner);
-if (s == NULL)
- log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) "
- "failed: %s", smtp_banner, expand_string_message);
+code = US"220"; /* Default status code */
+esc = US""; /* Default extended status code */
+esclen = 0; /* Length of esc */
+
+if (!user_msg)
+ {
+ if (!(s = expand_string(smtp_banner)))
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) "
+ "failed: %s", smtp_banner, expand_string_message);
+ }
+else
+ {
+ int codelen = 3;
+ s = user_msg;
+ smtp_message_code(&code, &codelen, &s, NULL, TRUE);
+ if (codelen > 4)
+ {
+ esc = code + 4;
+ esclen = codelen - 4;
+ }
+ }
/* Remove any terminating newlines; might as well remove trailing space too */
{
int len;
uschar *linebreak = Ustrchr(p, '\n');
+ ss = string_catn(ss, &size, &ptr, code, 3);
if (linebreak == NULL)
{
len = Ustrlen(p);
- ss = string_cat(ss, &size, &ptr, US"220 ", 4);
+ ss = string_catn(ss, &size, &ptr, US" ", 1);
}
else
{
len = linebreak - p;
- ss = string_cat(ss, &size, &ptr, US"220-", 4);
+ ss = string_catn(ss, &size, &ptr, US"-", 1);
}
- ss = string_cat(ss, &size, &ptr, p, len);
- ss = string_cat(ss, &size, &ptr, US"\r\n", 2);
+ ss = string_catn(ss, &size, &ptr, esc, esclen);
+ ss = string_catn(ss, &size, &ptr, p, len);
+ ss = string_catn(ss, &size, &ptr, US"\r\n", 2);
p += len;
if (linebreak != NULL) p++;
}
/* Before we write the banner, check that there is no input pending, unless
this synchronisation check is disabled. */
-if (smtp_enforce_sync && sender_host_address != NULL && !sender_host_notsocket)
+if (!check_sync())
{
- fd_set fds;
- struct timeval tzero;
- tzero.tv_sec = 0;
- tzero.tv_usec = 0;
- FD_ZERO(&fds);
- FD_SET(fileno(smtp_in), &fds);
- if (select(fileno(smtp_in) + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL,
- &tzero) > 0)
- {
- int rc = read(fileno(smtp_in), smtp_inbuffer, in_buffer_size);
- if (rc > 0)
- {
- if (rc > 150) rc = 150;
- smtp_inbuffer[rc] = 0;
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol "
- "synchronization error (input sent without waiting for greeting): "
- "rejected connection from %s input=\"%s\"", host_and_ident(TRUE),
- string_printing(smtp_inbuffer));
- smtp_printf("554 SMTP synchronization error\r\n");
- return FALSE;
- }
- }
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol "
+ "synchronization error (input sent without waiting for greeting): "
+ "rejected connection from %s input=\"%s\"", host_and_ident(TRUE),
+ string_printing(smtp_inptr));
+ smtp_printf("554 SMTP synchronization error\r\n");
+ return FALSE;
}
/* Now output the banner */
{
int yield = -1;
-log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s",
- (type == L_smtp_syntax_error)? "syntax" : "protocol",
- string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess);
-
-if (++synprot_error_count > smtp_max_synprot_errors)
- {
- yield = 1;
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
- "syntax or protocol errors (last command was \"%s\")",
- host_and_ident(FALSE), smtp_cmd_buffer);
- }
-
-if (code > 0)
- {
- smtp_printf("%d%c%s%s%s\r\n", code, (yield == 1)? '-' : ' ',
- (data == NULL)? US"" : data, (data == NULL)? US"" : US": ", errmess);
- if (yield == 1)
- smtp_printf("%d Too many syntax or protocol errors\r\n", code);
- }
-
-return yield;
-}
-
-
-
-
-/*************************************************
-* Log incomplete transactions *
-*************************************************/
-
-/* This function is called after a transaction has been aborted by RSET, QUIT,
-connection drops or other errors. It logs the envelope information received
-so far in order to preserve address verification attempts.
-
-Argument: string to indicate what aborted the transaction
-Returns: nothing
-*/
-
-static void
-incomplete_transaction_log(uschar *what)
-{
-if (sender_address == NULL || /* No transaction in progress */
- (log_write_selector & L_smtp_incomplete_transaction) == 0 /* Not logging */
- ) return;
+log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s",
+ (type == L_smtp_syntax_error)? "syntax" : "protocol",
+ string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess);
-/* Build list of recipients for logging */
+if (++synprot_error_count > smtp_max_synprot_errors)
+ {
+ yield = 1;
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
+ "syntax or protocol errors (last command was \"%s\")",
+ host_and_ident(FALSE), string_printing(smtp_cmd_buffer));
+ }
-if (recipients_count > 0)
+if (code > 0)
{
- int i;
- raw_recipients = store_get(recipients_count * sizeof(uschar *));
- for (i = 0; i < recipients_count; i++)
- raw_recipients[i] = recipients_list[i].address;
- raw_recipients_count = recipients_count;
+ smtp_printf("%d%c%s%s%s\r\n", code, (yield == 1)? '-' : ' ',
+ (data == NULL)? US"" : data, (data == NULL)? US"" : US": ", errmess);
+ if (yield == 1)
+ smtp_printf("%d Too many syntax or protocol errors\r\n", code);
}
-log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS,
- "%s incomplete transaction (%s)", host_and_ident(TRUE), what);
+return yield;
}
Arguments:
code SMTP code, may involve extended status codes
- codelen length of smtp code; uf > 3 there's an ESC
+ codelen length of smtp code; if > 4 there's an ESC
final FALSE if the last line isn't the final line
msg message text, possibly containing newlines
if (!final && no_multiline_responses) return;
-if (codelen > 3)
+if (codelen > 4)
{
esc = code + 4;
esclen = codelen - 4;
}
+/* If this is the first output for a (non-batch) RCPT command, see if all RCPTs
+have had the same. Note: this code is also present in smtp_printf(). It would
+be tidier to have it only in one place, but when it was added, it was easier to
+do it that way, so as not to have to mess with the code for the RCPT command,
+which sometimes uses smtp_printf() and sometimes smtp_respond(). */
+
+if (rcpt_in_progress)
+ {
+ if (rcpt_smtp_response == NULL)
+ rcpt_smtp_response = string_copy(msg);
+ else if (rcpt_smtp_response_same &&
+ Ustrcmp(rcpt_smtp_response, msg) != 0)
+ rcpt_smtp_response_same = FALSE;
+ rcpt_in_progress = FALSE;
+ }
+
+/* Not output the message, splitting it up into multiple lines if necessary. */
+
for (;;)
{
uschar *nl = Ustrchr(msg, '\n');
+/*************************************************
+* Parse user SMTP message *
+*************************************************/
+
+/* This function allows for user messages overriding the response code details
+by providing a suitable response code string at the start of the message
+user_msg. Check the message for starting with a response code and optionally an
+extended status code. If found, check that the first digit is valid, and if so,
+change the code pointer and length to use the replacement. An invalid code
+causes a panic log; in this case, if the log messages is the same as the user
+message, we must also adjust the value of the log message to show the code that
+is actually going to be used (the original one).
+
+This function is global because it is called from receive.c as well as within
+this module.
+
+Note that the code length returned includes the terminating whitespace
+character, which is always included in the regex match.
+
+Arguments:
+ code SMTP code, may involve extended status codes
+ codelen length of smtp code; if > 4 there's an ESC
+ msg message text
+ log_msg optional log message, to be adjusted with the new SMTP code
+ check_valid if true, verify the response code
+
+Returns: nothing
+*/
+
+void
+smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg,
+ BOOL check_valid)
+{
+int n;
+int ovector[3];
+
+if (!msg || !*msg) return;
+
+if ((n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0,
+ PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int))) < 0) return;
+
+if (check_valid && (*msg)[0] != (*code)[0])
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with "
+ "incorrect digit (expected %c) in \"%s\"", (*code)[0], *msg);
+ if (log_msg != NULL && *log_msg == *msg)
+ *log_msg = string_sprintf("%s %s", *code, *log_msg + ovector[1]);
+ }
+else
+ {
+ *code = *msg;
+ *codelen = ovector[1]; /* Includes final space */
+ }
+*msg += ovector[1]; /* Chop the code off the message */
+return;
+}
+
+
+
+
/*************************************************
* Handle an ACL failure *
*************************************************/
(aka RFC 2821) has concluded that the response should be 252 in the disabled
state, because there are broken clients that try VRFY before RCPT. A 5xx
response should be given only when the address is positively known to be
-undeliverable. Sigh. Also, for ETRN, 458 is given on refusal, and for AUTH,
-503.
+undeliverable. Sigh. We return 252 if there is no VRFY ACL or it provides
+no explicit code, but if there is one we let it know best.
+Also, for ETRN, 458 is given on refusal, and for AUTH, 503.
From Exim 4.63, it is possible to override the response code details by
providing a suitable response code string at the start of the message provided
in user_msg. The code's first digit is checked for validity.
Arguments:
- where where the ACL was called from
- rc the failure code
- user_msg a message that can be included in an SMTP response
- log_msg a message for logging
+ where where the ACL was called from
+ rc the failure code
+ user_msg a message that can be included in an SMTP response
+ log_msg a message for logging
Returns: 0 in most cases
2 if the failure code was FAIL_DROP, in which case the
{
BOOL drop = rc == FAIL_DROP;
int codelen = 3;
-int ovector[3];
uschar *smtp_code;
uschar *lognl;
uschar *sender_info = US"";
uschar *what =
#ifdef WITH_CONTENT_SCAN
- (where == ACL_WHERE_MIME)? US"during MIME ACL checks" :
+ where == ACL_WHERE_MIME ? US"during MIME ACL checks" :
+#endif
+ where == ACL_WHERE_PREDATA ? US"DATA" :
+ where == ACL_WHERE_DATA ? US"after DATA" :
+#ifndef DISABLE_PRDR
+ where == ACL_WHERE_PRDR ? US"after DATA PRDR" :
#endif
- (where == ACL_WHERE_PREDATA)? US"DATA" :
- (where == ACL_WHERE_DATA)? US"after DATA" :
- (smtp_cmd_argument == NULL)?
- string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]) :
- string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_argument);
+ smtp_cmd_data ?
+ string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data) :
+ string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]);
if (drop) rc = FAIL;
-/* Set the default SMTP code */
-
-smtp_code = (rc != FAIL)? US"451" : acl_wherecodes[where];
-
-/* Check a user message for starting with a response code and optionally an
-extended status code. If found, check that the first digit is valid, and if so,
-use it instead of the default code. */
-
-if (user_msg != NULL)
- {
- int n = pcre_exec(regex_smtp_code, NULL, CS user_msg, Ustrlen(user_msg), 0,
- PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int));
- if (n >= 0)
- {
- if (user_msg[0] != smtp_code[0])
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with "
- "incorrect digit (expected %c) in \"%s\"", smtp_code[0], user_msg);
-
- /* If log_msg == user_msg (the default set in acl.c if no log message is
- specified, we must adjust the log message to show the code that is
- actually going to be used. */
+/* Set the default SMTP code, and allow a user message to change it. */
- if (log_msg == user_msg)
- log_msg = string_sprintf("%s %s", smtp_code, log_msg + ovector[1]);
- }
- else
- {
- smtp_code = user_msg;
- codelen = ovector[1]; /* Includes final space */
- }
- user_msg += ovector[1]; /* Chop the code off the message */
- }
- }
+smtp_code = rc == FAIL ? acl_wherecodes[where] : US"451";
+smtp_message_code(&smtp_code, &codelen, &user_msg, &log_msg,
+ where != ACL_WHERE_VRFY);
/* We used to have sender_address here; however, there was a bug that was not
updating sender_address after a rewrite during a verify. When this bug was
if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA || where == ACL_WHERE_MIME)
#endif
{
- sender_info = string_sprintf("F=<%s> ", (sender_address_unrewritten != NULL)?
- sender_address_unrewritten : sender_address);
+ sender_info = string_sprintf("F=<%s>%s%s%s%s ",
+ sender_address_unrewritten ? sender_address_unrewritten : sender_address,
+ sender_host_authenticated ? US" A=" : US"",
+ sender_host_authenticated ? sender_host_authenticated : US"",
+ sender_host_authenticated && authenticated_id ? US":" : US"",
+ sender_host_authenticated && authenticated_id ? authenticated_id : US""
+ );
}
/* If there's been a sender verification failure with a specific message, and
failures, but not defers. However, always log it for defer, and log it for fail
unless the sender_verify_fail log selector has been turned off. */
-if (sender_verified_failed != NULL &&
+if (sender_verified_failed &&
!testflag(sender_verified_failed, af_sverify_told))
{
+ BOOL save_rcpt_in_progress = rcpt_in_progress;
+ rcpt_in_progress = FALSE; /* So as not to treat these as the error */
+
setflag(sender_verified_failed, af_sverify_told);
- if (rc != FAIL || (log_extra_selector & LX_sender_verify_fail) != 0)
+ if (rc != FAIL || LOGGING(sender_verify_fail))
log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s",
host_and_ident(TRUE),
((sender_verified_failed->special_action & 255) == DEFER)? "defer":"fail",
(sender_verified_failed->message == NULL)? US"" :
string_sprintf(": %s", sender_verified_failed->message));
- if (rc == FAIL && sender_verified_failed->user_message != NULL)
+ if (rc == FAIL && sender_verified_failed->user_message)
smtp_respond(smtp_code, codelen, FALSE, string_sprintf(
testflag(sender_verified_failed, af_verify_pmfail)?
"Postmaster verification failed while checking <%s>\n%s\n"
"Verification failed for <%s>\n%s",
sender_verified_failed->address,
sender_verified_failed->user_message));
+
+ rcpt_in_progress = save_rcpt_in_progress;
}
/* Sort out text for logging */
-log_msg = (log_msg == NULL)? US"" : string_sprintf(": %s", log_msg);
-lognl = Ustrchr(log_msg, '\n');
-if (lognl != NULL) *lognl = 0;
+log_msg = log_msg ? string_sprintf(": %s", log_msg) : US"";
+if ((lognl = Ustrchr(log_msg, '\n'))) *lognl = 0;
/* Send permanent failure response to the command, but the code used isn't
always a 5xx one - see comments at the start of this function. If the original
rc was FAIL_DROP we drop the connection and yield 2. */
-if (rc == FAIL) smtp_respond(smtp_code, codelen, TRUE, (user_msg == NULL)?
- US"Administrative prohibition" : user_msg);
+if (rc == FAIL)
+ smtp_respond(smtp_code, codelen, TRUE,
+ user_msg ? user_msg : US"Administrative prohibition");
/* Send temporary failure response to the command. Don't give any details,
unless acl_temp_details is set. This is TRUE for a callout defer, a "defer"
be re-implemented in a tidier fashion. */
else
- {
- if (acl_temp_details && user_msg != NULL)
+ if (acl_temp_details && user_msg)
{
- if (smtp_return_error_details &&
- sender_verified_failed != NULL &&
- sender_verified_failed->message != NULL)
- {
+ if ( smtp_return_error_details
+ && sender_verified_failed
+ && sender_verified_failed->message
+ )
smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message);
- }
+
smtp_respond(smtp_code, codelen, TRUE, user_msg);
}
else
smtp_respond(smtp_code, codelen, TRUE,
US"Temporary local problem - please try later");
- }
-/* Log the incident. If the connection is not forcibly to be dropped, return 0.
-Otherwise, log why it is closing if required and return 2. */
+/* Log the incident to the logs that are specified by log_reject_target
+(default main, reject). This can be empty to suppress logging of rejections. If
+the connection is not forcibly to be dropped, return 0. Otherwise, log why it
+is closing if required and return 2. */
-log_write(0, LOG_MAIN|LOG_REJECT, "%s %s%srejected %s%s",
- host_and_ident(TRUE),
- sender_info, (rc == FAIL)? US"" : US"temporarily ", what, log_msg);
+if (log_reject_target != 0)
+ {
+#ifdef SUPPORT_TLS
+ uschar * tls = s_tlslog(NULL, NULL, NULL);
+ if (!tls) tls = US"";
+#else
+ uschar * tls = US"";
+#endif
+ log_write(where == ACL_WHERE_CONNECT ? L_connection_reject : 0,
+ log_reject_target, "%s%s%s %s%srejected %s%s",
+ LOGGING(dnssec) && sender_host_dnssec ? US" DS" : US"",
+ host_and_ident(TRUE),
+ tls,
+ sender_info,
+ rc == FAIL ? US"" : US"temporarily ",
+ what, log_msg);
+ }
if (!drop) return 0;
log_write(L_smtp_connection, LOG_MAIN, "%s closed by DROP in ACL",
smtp_get_connection_info());
+
+/* Run the not-quit ACL, but without any custom messages. This should not be a
+problem, because we get here only if some other ACL has issued "drop", and
+in that case, *its* custom messages will have been used above. */
+
+smtp_notquit_exit(US"acl-drop", NULL, NULL);
return 2;
}
+/*************************************************
+* Handle SMTP exit when QUIT is not given *
+*************************************************/
+
+/* This function provides a logging/statistics hook for when an SMTP connection
+is dropped on the floor or the other end goes away. It's a global function
+because it's called from receive.c as well as this module. As well as running
+the NOTQUIT ACL, if there is one, this function also outputs a final SMTP
+response, either with a custom message from the ACL, or using a default. There
+is one case, however, when no message is output - after "drop". In that case,
+the ACL that obeyed "drop" has already supplied the custom message, and NULL is
+passed to this function.
+
+In case things go wrong while processing this function, causing an error that
+may re-enter this function, there is a recursion check.
+
+Arguments:
+ reason What $smtp_notquit_reason will be set to in the ACL;
+ if NULL, the ACL is not run
+ code The error code to return as part of the response
+ defaultrespond The default message if there's no user_msg
+
+Returns: Nothing
+*/
+
+void
+smtp_notquit_exit(uschar *reason, uschar *code, uschar *defaultrespond, ...)
+{
+int rc;
+uschar *user_msg = NULL;
+uschar *log_msg = NULL;
+
+/* Check for recursive acll */
+
+if (smtp_exit_function_called)
+ {
+ log_write(0, LOG_PANIC, "smtp_notquit_exit() called more than once (%s)",
+ reason);
+ return;
+ }
+smtp_exit_function_called = TRUE;
+
+/* Call the not-QUIT ACL, if there is one, unless no reason is given. */
+
+if (acl_smtp_notquit && reason)
+ {
+ smtp_notquit_reason = reason;
+ if ((rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg,
+ &log_msg)) == ERROR)
+ log_write(0, LOG_MAIN|LOG_PANIC, "ACL for not-QUIT returned ERROR: %s",
+ log_msg);
+ }
+
+/* Write an SMTP response if we are expected to give one. As the default
+responses are all internal, they should always fit in the buffer, but code a
+warning, just in case. Note that string_vformat() still leaves a complete
+string, even if it is incomplete. */
+
+if (code && defaultrespond)
+ {
+ if (user_msg)
+ smtp_respond(code, 3, TRUE, user_msg);
+ else
+ {
+ uschar buffer[128];
+ va_list ap;
+ va_start(ap, defaultrespond);
+ if (!string_vformat(buffer, sizeof(buffer), CS defaultrespond, ap))
+ log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_notquit_exit()");
+ smtp_printf("%s %s\r\n", code, buffer);
+ va_end(ap);
+ }
+ mac_smtp_fflush();
+ }
+}
+
+
+
+
/*************************************************
* Verify HELO argument *
*************************************************/
HDEBUG(D_receive) debug_printf("no EHLO/HELO command was issued\n");
}
+/* Deal with the case of -bs without an IP address */
+
+else if (sender_host_address == NULL)
+ {
+ HDEBUG(D_receive) debug_printf("no client IP address: assume success\n");
+ helo_verified = TRUE;
+ }
+
+/* Deal with the more common case when there is a sending IP address */
+
else if (sender_helo_name[0] == '[')
{
helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address,
/* If a host name is known, check it and all its aliases. */
- if (sender_host_name != NULL)
- {
- helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0;
-
- if (helo_verified)
+ if (sender_host_name)
+ if ((helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0))
{
+ sender_helo_dnssec = sender_host_dnssec;
HDEBUG(D_receive) debug_printf("matched host name\n");
}
else
{
uschar **aliases = sender_host_aliases;
- while (*aliases != NULL)
- {
- helo_verified = strcmpic(*aliases++, sender_helo_name) == 0;
- if (helo_verified) break;
- }
- HDEBUG(D_receive)
- {
- if (helo_verified)
+ while (*aliases)
+ if ((helo_verified = strcmpic(*aliases++, sender_helo_name) == 0))
+ {
+ sender_helo_dnssec = sender_host_dnssec;
+ break;
+ }
+
+ HDEBUG(D_receive) if (helo_verified)
debug_printf("matched alias %s\n", *(--aliases));
- }
}
- }
/* Final attempt: try a forward lookup of the helo name */
{
int rc;
host_item h;
+ dnssec_domains d;
+ host_item *hh;
+
h.name = sender_helo_name;
h.address = NULL;
h.mx = MX_NONE;
h.next = NULL;
+ d.request = US"*";
+ d.require = US"";
+
HDEBUG(D_receive) debug_printf("getting IP address for %s\n",
sender_helo_name);
- rc = host_find_byname(&h, NULL, NULL, TRUE);
+ rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A,
+ NULL, NULL, NULL, &d, NULL, NULL);
if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
- {
- host_item *hh = &h;
- while (hh != NULL)
- {
+ for (hh = &h; hh; hh = hh->next)
if (Ustrcmp(hh->address, sender_host_address) == 0)
{
helo_verified = TRUE;
+ if (h.dnssec == DS_YES) sender_helo_dnssec = TRUE;
HDEBUG(D_receive)
- debug_printf("IP address for %s matches calling address\n",
- sender_helo_name);
+ {
+ debug_printf("IP address for %s matches calling address\n"
+ "Forward DNS security status: %sverified\n",
+ sender_helo_name, sender_helo_dnssec ? "" : "un");
+ }
break;
}
- hh = hh->next;
- }
- }
}
}
-if (!helo_verified) helo_verify_failed = FALSE; /* We've tried ... */
+if (!helo_verified) helo_verify_failed = TRUE; /* We've tried ... */
return yield;
}
+/*************************************************
+* Send user response message *
+*************************************************/
+
+/* This function is passed a default response code and a user message. It calls
+smtp_message_code() to check and possibly modify the response code, and then
+calls smtp_respond() to transmit the response. I put this into a function
+just to avoid a lot of repetition.
+
+Arguments:
+ code the response code
+ user_msg the user message
+
+Returns: nothing
+*/
+
+static void
+smtp_user_msg(uschar *code, uschar *user_msg)
+{
+int len = 3;
+smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
+smtp_respond(code, len, TRUE, user_msg);
+}
+
+
+
+static int
+smtp_in_auth(auth_instance *au, uschar ** s, uschar ** ss)
+{
+const uschar *set_id = NULL;
+int rc, i;
+
+/* Run the checking code, passing the remainder of the command line as
+data. Initials the $auth<n> variables as empty. Initialize $0 empty and set
+it as the only set numerical variable. The authenticator may set $auth<n>
+and also set other numeric variables. The $auth<n> variables are preferred
+nowadays; the numerical variables remain for backwards compatibility.
+
+Afterwards, have a go at expanding the set_id string, even if
+authentication failed - for bad passwords it can be useful to log the
+userid. On success, require set_id to expand and exist, and put it in
+authenticated_id. Save this in permanent store, as the working store gets
+reset at HELO, RSET, etc. */
+
+for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
+expand_nmax = 0;
+expand_nlength[0] = 0; /* $0 contains nothing */
+
+rc = (au->info->servercode)(au, smtp_cmd_data);
+if (au->set_id) set_id = expand_string(au->set_id);
+expand_nmax = -1; /* Reset numeric variables */
+for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */
+
+/* The value of authenticated_id is stored in the spool file and printed in
+log lines. It must not contain binary zeros or newline characters. In
+normal use, it never will, but when playing around or testing, this error
+can (did) happen. To guard against this, ensure that the id contains only
+printing characters. */
+
+if (set_id) set_id = string_printing(set_id);
+
+/* For the non-OK cases, set up additional logging data if set_id
+is not empty. */
+
+if (rc != OK)
+ set_id = set_id && *set_id
+ ? string_sprintf(" (set_id=%s)", set_id) : US"";
+
+/* Switch on the result */
+
+switch(rc)
+ {
+ case OK:
+ if (!au->set_id || set_id) /* Complete success */
+ {
+ if (set_id) authenticated_id = string_copy_malloc(set_id);
+ sender_host_authenticated = au->name;
+ authentication_failed = FALSE;
+ authenticated_fail_id = NULL; /* Impossible to already be set? */
+
+ received_protocol =
+ (sender_host_address ? protocols : protocols_local)
+ [pextend + pauthed + (tls_in.active >= 0 ? pcrpted:0)];
+ *s = *ss = US"235 Authentication succeeded";
+ authenticated_by = au;
+ break;
+ }
+
+ /* Authentication succeeded, but we failed to expand the set_id string.
+ Treat this as a temporary error. */
+
+ auth_defer_msg = expand_string_message;
+ /* Fall through */
+
+ case DEFER:
+ if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
+ *s = string_sprintf("435 Unable to authenticate at present%s",
+ auth_defer_user_msg);
+ *ss = string_sprintf("435 Unable to authenticate at present%s: %s",
+ set_id, auth_defer_msg);
+ break;
+
+ case BAD64:
+ *s = *ss = US"501 Invalid base64 data";
+ break;
+
+ case CANCELLED:
+ *s = *ss = US"501 Authentication cancelled";
+ break;
+
+ case UNEXPECTED:
+ *s = *ss = US"553 Initial data not expected";
+ break;
+
+ case FAIL:
+ if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
+ *s = US"535 Incorrect authentication data";
+ *ss = string_sprintf("535 Incorrect authentication data%s", set_id);
+ break;
+
+ default:
+ if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
+ *s = US"435 Internal error";
+ *ss = string_sprintf("435 Internal error%s: return %d from authentication "
+ "check", set_id, rc);
+ break;
+ }
+
+return rc;
+}
+
+
+
+
+
+static int
+qualify_recipient(uschar ** recipient, uschar * smtp_cmd_data, uschar * tag)
+{
+int rd;
+if (allow_unqualified_recipient || strcmpic(*recipient, US"postmaster") == 0)
+ {
+ DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
+ *recipient);
+ rd = Ustrlen(recipient) + 1;
+ *recipient = rewrite_address_qualify(*recipient, TRUE);
+ return rd;
+ }
+smtp_printf("501 %s: recipient address must contain a domain\r\n",
+ smtp_cmd_data);
+log_write(L_smtp_syntax_error,
+ LOG_MAIN|LOG_REJECT, "unqualified %s rejected: <%s> %s%s",
+ tag, *recipient, host_and_ident(TRUE), host_lookup_msg);
+return 0;
+}
+
+
+
+
+static void
+smtp_quit_handler(uschar ** user_msgp, uschar ** log_msgp)
+{
+HAD(SCH_QUIT);
+incomplete_transaction_log(US"QUIT");
+if (acl_smtp_quit)
+ {
+ int rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, user_msgp, log_msgp);
+ if (rc == ERROR)
+ log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
+ *log_msgp);
+ }
+if (*user_msgp)
+ smtp_respond(US"221", 3, TRUE, *user_msgp);
+else
+ smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
+
+#ifdef SUPPORT_TLS
+tls_close(TRUE, TRUE);
+#endif
+
+log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
+ smtp_get_connection_info());
+}
+
+
+static void
+smtp_rset_handler(void)
+{
+HAD(SCH_RSET);
+incomplete_transaction_log(US"RSET");
+smtp_printf("250 Reset OK\r\n");
+cmd_list[CMD_LIST_RSET].is_mail_cmd = FALSE;
+}
+
+
+
/*************************************************
* Initialize for SMTP incoming message *
*************************************************/
smtp_reset(reset_point);
message_ended = END_NOTSTARTED;
+chunking_state = chunking_offered ? CHUNKING_OFFERED : CHUNKING_NOT_OFFERED;
+
cmd_list[CMD_LIST_RSET].is_mail_cmd = TRUE;
cmd_list[CMD_LIST_HELO].is_mail_cmd = TRUE;
cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE;
#ifdef SUPPORT_TLS
cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = TRUE;
+cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE;
#endif
/* Set the local signal handler for SIGTERM - it tries to end off tidily */
while (done <= 0)
{
- uschar **argv;
+ const uschar **argv;
uschar *etrn_command;
uschar *etrn_serialize_key;
uschar *errmess;
- uschar *user_msg, *log_msg;
+ uschar *log_msg, *smtp_code;
+ uschar *user_msg = NULL;
uschar *recipient = NULL;
uschar *hello = NULL;
- uschar *set_id = NULL;
uschar *s, *ss;
BOOL was_rej_mail = FALSE;
BOOL was_rcpt = FALSE;
pid_t pid;
int start, end, sender_domain, recipient_domain;
int ptr, size, rc;
- int c, i;
+ int c;
auth_instance *au;
+ uschar *orcpt = NULL;
+ int flags;
+
+#ifdef AUTH_TLS
+ /* Check once per STARTTLS or SSL-on-connect for a TLS AUTH */
+ if ( tls_in.active >= 0
+ && tls_in.peercert
+ && tls_in.certificate_verified
+ && cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd
+ )
+ {
+ cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = FALSE;
+ if ( acl_smtp_auth
+ && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth,
+ &user_msg, &log_msg)) != OK
+ )
+ {
+ done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg);
+ continue;
+ }
- switch(smtp_read_command(TRUE))
+ for (au = auths; au; au = au->next)
+ if (strcmpic(US"tls", au->driver_name) == 0)
+ {
+ smtp_cmd_data = NULL;
+
+ if (smtp_in_auth(au, &s, &ss) == OK)
+ { DEBUG(D_auth) debug_printf("tls auth succeeded\n"); }
+ else
+ { DEBUG(D_auth) debug_printf("tls auth not succeeded\n"); }
+ break;
+ }
+ }
+#endif
+
+#ifdef TCP_QUICKACK
+ if (smtp_in) /* Avoid pure-ACKs while in cmd pingpong phase */
+ (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
+ US &off, sizeof(off));
+#endif
+
+ switch(smtp_read_command(TRUE, GETC_BUFFER_UNLIMITED))
{
/* The AUTH command is not permitted to occur inside a transaction, and may
occur successfully only once per connection. Actually, that isn't quite
AUTHS will eventually hit the nonmail threshold. */
case AUTH_CMD:
+ HAD(SCH_AUTH);
authentication_failed = TRUE;
cmd_list[CMD_LIST_AUTH].is_mail_cmd = FALSE;
US"AUTH command used when not advertised");
break;
}
- if (sender_host_authenticated != NULL)
+ if (sender_host_authenticated)
{
done = synprot_error(L_smtp_protocol_error, 503, NULL,
US"already authenticated");
break;
}
- if (sender_address != NULL)
+ if (sender_address)
{
done = synprot_error(L_smtp_protocol_error, 503, NULL,
US"not permitted in mail transaction");
/* Check the ACL */
- if (acl_smtp_auth != NULL)
+ if ( acl_smtp_auth
+ && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth,
+ &user_msg, &log_msg)) != OK
+ )
{
- rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, &user_msg, &log_msg);
- if (rc != OK)
- {
- done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg);
- break;
- }
+ done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg);
+ break;
}
/* Find the name of the requested authentication mechanism. */
- s = smtp_cmd_argument;
- while ((c = *smtp_cmd_argument) != 0 && !isspace(c))
+ s = smtp_cmd_data;
+ while ((c = *smtp_cmd_data) != 0 && !isspace(c))
{
if (!isalnum(c) && c != '-' && c != '_')
{
US"invalid character in authentication mechanism name");
goto COMMAND_LOOP;
}
- smtp_cmd_argument++;
+ smtp_cmd_data++;
}
/* If not at the end of the line, we must be at white space. Terminate the
name and move the pointer on to any data that may be present. */
- if (*smtp_cmd_argument != 0)
- {
- *smtp_cmd_argument++ = 0;
- while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++;
- }
-
- /* Search for an authentication mechanism which is configured for use
- as a server and which has been advertised (unless, sigh, allow_auth_
- unadvertised is set). */
-
- for (au = auths; au != NULL; au = au->next)
- {
- if (strcmpic(s, au->public_name) == 0 && au->server &&
- (au->advertised || allow_auth_unadvertised)) break;
- }
-
- if (au == NULL)
- {
- done = synprot_error(L_smtp_protocol_error, 504, NULL,
- string_sprintf("%s authentication mechanism not supported", s));
- break;
- }
-
- /* Run the checking code, passing the remainder of the command line as
- data. Initials the $auth<n> variables as empty. Initialize $0 empty and set
- it as the only set numerical variable. The authenticator may set $auth<n>
- and also set other numeric variables. The $auth<n> variables are preferred
- nowadays; the numerical variables remain for backwards compatibility.
-
- Afterwards, have a go at expanding the set_id string, even if
- authentication failed - for bad passwords it can be useful to log the
- userid. On success, require set_id to expand and exist, and put it in
- authenticated_id. Save this in permanent store, as the working store gets
- reset at HELO, RSET, etc. */
-
- for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
- expand_nmax = 0;
- expand_nlength[0] = 0; /* $0 contains nothing */
-
- c = (au->info->servercode)(au, smtp_cmd_argument);
- if (au->set_id != NULL) set_id = expand_string(au->set_id);
- expand_nmax = -1; /* Reset numeric variables */
- for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */
-
- /* The value of authenticated_id is stored in the spool file and printed in
- log lines. It must not contain binary zeros or newline characters. In
- normal use, it never will, but when playing around or testing, this error
- can (did) happen. To guard against this, ensure that the id contains only
- printing characters. */
-
- if (set_id != NULL) set_id = string_printing(set_id);
-
- /* For the non-OK cases, set up additional logging data if set_id
- is not empty. */
-
- if (c != OK)
- {
- if (set_id != NULL && *set_id != 0)
- set_id = string_sprintf(" (set_id=%s)", set_id);
- else set_id = US"";
- }
-
- /* Switch on the result */
-
- switch(c)
- {
- case OK:
- if (au->set_id == NULL || set_id != NULL) /* Complete success */
- {
- if (set_id != NULL) authenticated_id = string_copy_malloc(set_id);
- sender_host_authenticated = au->name;
- authentication_failed = FALSE;
- received_protocol =
- protocols[pextend + pauthed + ((tls_active >= 0)? pcrpted:0)] +
- ((sender_host_address != NULL)? pnlocal : 0);
- s = ss = US"235 Authentication succeeded";
- authenticated_by = au;
- break;
- }
-
- /* Authentication succeeded, but we failed to expand the set_id string.
- Treat this as a temporary error. */
-
- auth_defer_msg = expand_string_message;
- /* Fall through */
-
- case DEFER:
- s = string_sprintf("435 Unable to authenticate at present%s",
- auth_defer_user_msg);
- ss = string_sprintf("435 Unable to authenticate at present%s: %s",
- set_id, auth_defer_msg);
- break;
-
- case BAD64:
- s = ss = US"501 Invalid base64 data";
- break;
+ if (*smtp_cmd_data != 0)
+ {
+ *smtp_cmd_data++ = 0;
+ while (isspace(*smtp_cmd_data)) smtp_cmd_data++;
+ }
- case CANCELLED:
- s = ss = US"501 Authentication cancelled";
- break;
+ /* Search for an authentication mechanism which is configured for use
+ as a server and which has been advertised (unless, sigh, allow_auth_
+ unadvertised is set). */
- case UNEXPECTED:
- s = ss = US"553 Initial data not expected";
- break;
+ for (au = auths; au; au = au->next)
+ if (strcmpic(s, au->public_name) == 0 && au->server &&
+ (au->advertised || allow_auth_unadvertised))
+ break;
- case FAIL:
- s = US"535 Incorrect authentication data";
- ss = string_sprintf("535 Incorrect authentication data%s", set_id);
- break;
+ if (au)
+ {
+ c = smtp_in_auth(au, &s, &ss);
- default:
- s = US"435 Internal error";
- ss = string_sprintf("435 Internal error%s: return %d from authentication "
- "check", set_id, c);
- break;
+ smtp_printf("%s\r\n", s);
+ if (c != OK)
+ log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s",
+ au->name, host_and_ident(FALSE), ss);
}
-
- smtp_printf("%s\r\n", s);
- if (c != OK)
- log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s",
- au->name, host_and_ident(FALSE), ss);
+ else
+ done = synprot_error(L_smtp_protocol_error, 504, NULL,
+ string_sprintf("%s authentication mechanism not supported", s));
break; /* AUTH_CMD */
it did the reset first. */
case HELO_CMD:
+ HAD(SCH_HELO);
hello = US"HELO";
esmtp = FALSE;
goto HELO_EHLO;
case EHLO_CMD:
+ HAD(SCH_EHLO);
hello = US"EHLO";
esmtp = TRUE;
/* Reject the HELO if its argument was invalid or non-existent. A
successful check causes the argument to be saved in malloc store. */
- if (!check_helo(smtp_cmd_argument))
+ if (!check_helo(smtp_cmd_data))
{
smtp_printf("501 Syntactically invalid %s argument(s)\r\n", hello);
{
log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
"syntax or protocol errors (last command was \"%s\")",
- host_and_ident(FALSE), smtp_cmd_buffer);
+ host_and_ident(FALSE), string_printing(smtp_cmd_buffer));
done = 1;
}
if (!sender_host_unknown)
{
BOOL old_helo_verified = helo_verified;
- uschar *p = smtp_cmd_argument;
+ uschar *p = smtp_cmd_data;
while (*p != 0 && !isspace(*p)) { *p = tolower(*p); p++; }
*p = 0;
if (sender_host_name == NULL &&
(deliver_domain = sender_helo_name, /* set $domain */
- match_isinlist(sender_helo_name, &helo_lookup_domains, 0,
+ match_isinlist(sender_helo_name, CUSS &helo_lookup_domains, 0,
&domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL)) == OK)
(void)host_name_lookup();
host_build_sender_fullhost(); /* Rebuild */
set_process_info("handling%s incoming connection from %s",
- (tls_active >= 0)? " TLS" : "", host_and_ident(FALSE));
+ (tls_in.active >= 0)? " TLS" : "", host_and_ident(FALSE));
/* Verify if configured. This doesn't give much security, but it does
make some people happy to be able to do it. If helo_required is set,
now obsolescent, since the verification can now be requested selectively
at ACL time. */
- helo_verified = helo_verify_failed = FALSE;
+ helo_verified = helo_verify_failed = sender_helo_dnssec = FALSE;
if (helo_required || helo_verify)
{
BOOL tempfail = !smtp_verify_helo();
spf_init(sender_helo_name, sender_host_address);
#endif
- /* Apply an ACL check if one is defined */
+ /* Apply an ACL check if one is defined; afterwards, recheck
+ synchronization in case the client started sending in a delay. */
- if (acl_smtp_helo != NULL)
- {
- rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo, &user_msg, &log_msg);
- if (rc != OK)
+ if (acl_smtp_helo)
+ if ((rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo,
+ &user_msg, &log_msg)) != OK)
{
done = smtp_handle_acl_fail(ACL_WHERE_HELO, rc, user_msg, log_msg);
sender_helo_name = NULL;
host_build_sender_fullhost(); /* Rebuild */
break;
}
- }
-
- /* The EHLO/HELO command is acceptable. Reset the protocol and the state,
- abandoning any previous message. */
-
- received_protocol = (esmtp?
- protocols[pextend +
- ((sender_host_authenticated != NULL)? pauthed : 0) +
- ((tls_active >= 0)? pcrpted : 0)]
- :
- protocols[pnormal + ((tls_active >= 0)? pcrpted : 0)])
- +
- ((sender_host_address != NULL)? pnlocal : 0);
-
- smtp_reset(reset_point);
- toomany = FALSE;
+ else if (!check_sync()) goto SYNC_FAILURE;
- /* Generate an OK reply, including the ident if present, and also
- the IP address if present. Reflecting back the ident is intended
- as a deterrent to mail forgers. For maximum efficiency, and also
- because some broken systems expect each response to be in a single
- packet, arrange that it is sent in one write(). */
+ /* Generate an OK reply. The default string includes the ident if present,
+ and also the IP address if present. Reflecting back the ident is intended
+ as a deterrent to mail forgers. For maximum efficiency, and also because
+ some broken systems expect each response to be in a single packet, arrange
+ that the entire reply is sent in one write(). */
auth_advertised = FALSE;
pipelining_advertised = FALSE;
- #ifdef SUPPORT_TLS
+#ifdef SUPPORT_TLS
tls_advertised = FALSE;
- #endif
+#endif
+ dsn_advertised = FALSE;
+#ifdef SUPPORT_I18N
+ smtputf8_advertised = FALSE;
+#endif
+
+ smtp_code = US"250 "; /* Default response code plus space*/
+ if (user_msg == NULL)
+ {
+ s = string_sprintf("%.3s %s Hello %s%s%s",
+ smtp_code,
+ smtp_active_hostname,
+ (sender_ident == NULL)? US"" : sender_ident,
+ (sender_ident == NULL)? US"" : US" at ",
+ (sender_host_name == NULL)? sender_helo_name : sender_host_name);
+
+ ptr = Ustrlen(s);
+ size = ptr + 1;
- s = string_sprintf("250 %s Hello %s%s%s",
- smtp_active_hostname,
- (sender_ident == NULL)? US"" : sender_ident,
- (sender_ident == NULL)? US"" : US" at ",
- (sender_host_name == NULL)? sender_helo_name : sender_host_name);
+ if (sender_host_address != NULL)
+ {
+ s = string_catn(s, &size, &ptr, US" [", 2);
+ s = string_cat (s, &size, &ptr, sender_host_address);
+ s = string_catn(s, &size, &ptr, US"]", 1);
+ }
+ }
- ptr = Ustrlen(s);
- size = ptr + 1;
+ /* A user-supplied EHLO greeting may not contain more than one line. Note
+ that the code returned by smtp_message_code() includes the terminating
+ whitespace character. */
- if (sender_host_address != NULL)
+ else
{
- s = string_cat(s, &size, &ptr, US" [", 2);
- s = string_cat(s, &size, &ptr, sender_host_address,
- Ustrlen(sender_host_address));
- s = string_cat(s, &size, &ptr, US"]", 1);
+ char *ss;
+ int codelen = 4;
+ smtp_message_code(&smtp_code, &codelen, &user_msg, NULL, TRUE);
+ s = string_sprintf("%.*s%s", codelen, smtp_code, user_msg);
+ if ((ss = strpbrk(CS s, "\r\n")) != NULL)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "EHLO/HELO response must not contain "
+ "newlines: message truncated: %s", string_printing(s));
+ *ss = 0;
+ }
+ ptr = Ustrlen(s);
+ size = ptr + 1;
}
- s = string_cat(s, &size, &ptr, US"\r\n", 2);
+ s = string_catn(s, &size, &ptr, US"\r\n", 2);
/* If we received EHLO, we must create a multiline response which includes
the functions supported. */
if (thismessage_size_limit > 0)
{
- sprintf(CS big_buffer, "250-SIZE %d\r\n", thismessage_size_limit);
- s = string_cat(s, &size, &ptr, big_buffer, Ustrlen(big_buffer));
+ sprintf(CS big_buffer, "%.3s-SIZE %d\r\n", smtp_code,
+ thismessage_size_limit);
+ s = string_cat(s, &size, &ptr, big_buffer);
}
else
{
- s = string_cat(s, &size, &ptr, US"250-SIZE\r\n", 10);
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-SIZE\r\n", 7);
}
/* Exim does not do protocol conversion or data conversion. It is 8-bit
provided as an option. */
if (accept_8bitmime)
- s = string_cat(s, &size, &ptr, US"250-8BITMIME\r\n", 14);
-
- /* Advertise ETRN if there's an ACL checking whether a host is
- permitted to issue it; a check is made when any host actually tries. */
+ {
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-8BITMIME\r\n", 11);
+ }
- if (acl_smtp_etrn != NULL)
+ /* Advertise DSN support if configured to do so. */
+ if (verify_check_host(&dsn_advertise_hosts) != FAIL)
{
- s = string_cat(s, &size, &ptr, US"250-ETRN\r\n", 10);
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-DSN\r\n", 6);
+ dsn_advertised = TRUE;
}
- /* Advertise EXPN if there's an ACL checking whether a host is
- permitted to issue it; a check is made when any host actually tries. */
+ /* Advertise ETRN/VRFY/EXPN if there's are ACL checking whether a host is
+ permitted to issue them; a check is made when any host actually tries. */
- if (acl_smtp_expn != NULL)
+ if (acl_smtp_etrn)
+ {
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-ETRN\r\n", 7);
+ }
+ if (acl_smtp_vrfy)
+ {
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-VRFY\r\n", 7);
+ }
+ if (acl_smtp_expn)
{
- s = string_cat(s, &size, &ptr, US"250-EXPN\r\n", 10);
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-EXPN\r\n", 7);
}
/* Exim is quite happy with pipelining, so let the other end know that
it is safe to use it, unless advertising is disabled. */
- if (verify_check_host(&pipelining_advertise_hosts) == OK)
+ if (pipelining_enable &&
+ verify_check_host(&pipelining_advertise_hosts) == OK)
{
- s = string_cat(s, &size, &ptr, US"250-PIPELINING\r\n", 16);
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-PIPELINING\r\n", 13);
sync_cmd_limit = NON_SYNC_CMD_PIPELINING;
pipelining_advertised = TRUE;
}
+
/* If any server authentication mechanisms are configured, advertise
them if the current host is in auth_advertise_hosts. The problem with
advertising always is that some clients then require users to
letters, so output the names in upper case, though we actually recognize
them in either case in the AUTH command. */
- if (auths != NULL)
+ if ( auths
+#ifdef AUTH_TLS
+ && !sender_host_authenticated
+#endif
+ && verify_check_host(&auth_advertise_hosts) == OK
+ )
+ {
+ auth_instance *au;
+ BOOL first = TRUE;
+ for (au = auths; au; au = au->next)
+ if (au->server && (au->advertise_condition == NULL ||
+ expand_check_condition(au->advertise_condition, au->name,
+ US"authenticator")))
+ {
+ int saveptr;
+ if (first)
+ {
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-AUTH", 5);
+ first = FALSE;
+ auth_advertised = TRUE;
+ }
+ saveptr = ptr;
+ s = string_catn(s, &size, &ptr, US" ", 1);
+ s = string_cat (s, &size, &ptr, au->public_name);
+ while (++saveptr < ptr) s[saveptr] = toupper(s[saveptr]);
+ au->advertised = TRUE;
+ }
+ else
+ au->advertised = FALSE;
+
+ if (!first) s = string_catn(s, &size, &ptr, US"\r\n", 2);
+ }
+
+ /* RFC 3030 CHUNKING */
+
+ if (verify_check_host(&chunking_advertise_hosts) != FAIL)
{
- if (verify_check_host(&auth_advertise_hosts) == OK)
- {
- auth_instance *au;
- BOOL first = TRUE;
- for (au = auths; au != NULL; au = au->next)
- {
- if (au->server && (au->advertise_condition == NULL ||
- expand_check_condition(au->advertise_condition, au->name,
- US"authenticator")))
- {
- int saveptr;
- if (first)
- {
- s = string_cat(s, &size, &ptr, US"250-AUTH", 8);
- first = FALSE;
- auth_advertised = TRUE;
- }
- saveptr = ptr;
- s = string_cat(s, &size, &ptr, US" ", 1);
- s = string_cat(s, &size, &ptr, au->public_name,
- Ustrlen(au->public_name));
- while (++saveptr < ptr) s[saveptr] = toupper(s[saveptr]);
- au->advertised = TRUE;
- }
- else au->advertised = FALSE;
- }
- if (!first) s = string_cat(s, &size, &ptr, US"\r\n", 2);
- }
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-CHUNKING\r\n", 11);
+ chunking_offered = TRUE;
+ chunking_state = CHUNKING_OFFERED;
}
/* Advertise TLS (Transport Level Security) aka SSL (Secure Socket Layer)
tls_advertise_hosts. We must *not* advertise if we are already in a
secure connection. */
- #ifdef SUPPORT_TLS
- if (tls_active < 0 &&
+#ifdef SUPPORT_TLS
+ if (tls_in.active < 0 &&
verify_check_host(&tls_advertise_hosts) != FAIL)
{
- s = string_cat(s, &size, &ptr, US"250-STARTTLS\r\n", 14);
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-STARTTLS\r\n", 11);
tls_advertised = TRUE;
}
- #endif
+#endif
+
+#ifndef DISABLE_PRDR
+ /* Per Recipient Data Response, draft by Eric A. Hall extending RFC */
+ if (prdr_enable)
+ {
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-PRDR\r\n", 7);
+ }
+#endif
+
+#ifdef SUPPORT_I18N
+ if ( accept_8bitmime
+ && verify_check_host(&smtputf8_advertise_hosts) != FAIL)
+ {
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-SMTPUTF8\r\n", 11);
+ smtputf8_advertised = TRUE;
+ }
+#endif
/* Finish off the multiline reply with one that is always available. */
- s = string_cat(s, &size, &ptr, US"250 HELP\r\n", 10);
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US" HELP\r\n", 7);
}
/* Terminate the string (for debug), write it, and note that HELO/EHLO
s[ptr] = 0;
- #ifdef SUPPORT_TLS
- if (tls_active >= 0) (void)tls_write(s, ptr); else
- #endif
+#ifdef SUPPORT_TLS
+ if (tls_in.active >= 0) (void)tls_write(TRUE, s, ptr); else
+#endif
- (void)fwrite(s, 1, ptr, smtp_out);
+ {
+ int i = fwrite(s, 1, ptr, smtp_out); i = i; /* compiler quietening */
+ }
DEBUG(D_receive)
{
uschar *cr;
debug_printf("SMTP>> %s", s);
}
helo_seen = TRUE;
+
+ /* Reset the protocol and the state, abandoning any previous message. */
+ received_protocol =
+ (sender_host_address ? protocols : protocols_local)
+ [ (esmtp
+ ? pextend + (sender_host_authenticated ? pauthed : 0)
+ : pnormal)
+ + (tls_in.active >= 0 ? pcrpted : 0)
+ ];
+ smtp_reset(reset_point);
+ toomany = FALSE;
break; /* HELO/EHLO */
it is the canonical extracted address which is all that is kept. */
case MAIL_CMD:
+ HAD(SCH_MAIL);
smtp_mailcmd_count++; /* Count for limit and ratelimit */
was_rej_mail = TRUE; /* Reset if accepted */
+ env_mail_type_t * mail_args; /* Sanity check & validate args */
if (helo_required && !helo_seen)
{
break;
}
- if (smtp_cmd_argument[0] == 0)
+ if (smtp_cmd_data[0] == 0)
{
done = synprot_error(L_smtp_protocol_error, 501, NULL,
US"MAIL must have an address operand");
{
uschar *name, *value, *end;
unsigned long int size;
+ BOOL arg_error = FALSE;
if (!extract_option(&name, &value)) break;
- /* Handle SIZE= by reading the value. We don't do the check till later,
- in order to be able to log the sender address on failure. */
-
- if (strcmpic(name, US"SIZE") == 0 &&
- ((size = (int)Ustrtoul(value, &end, 10)), *end == 0))
- {
- if ((size == ULONG_MAX && errno == ERANGE) || size > INT_MAX)
- size = INT_MAX;
- message_size = (int)size;
- }
+ for (mail_args = env_mail_type_list;
+ mail_args->value != ENV_MAIL_OPT_NULL;
+ mail_args++
+ )
+ if (strcmpic(name, mail_args->name) == 0)
+ break;
+ if (mail_args->need_value && strcmpic(value, US"") == 0)
+ break;
- /* If this session was initiated with EHLO and accept_8bitmime is set,
- Exim will have indicated that it supports the BODY=8BITMIME option. In
- fact, it does not support this according to the RFCs, in that it does not
- take any special action for forwarding messages containing 8-bit
- characters. That is why accept_8bitmime is not the default setting, but
- some sites want the action that is provided. We recognize both "8BITMIME"
- and "7BIT" as body types, but take no action. */
-
- else if (accept_8bitmime && strcmpic(name, US"BODY") == 0 &&
- (strcmpic(value, US"8BITMIME") == 0 ||
- strcmpic(value, US"7BIT") == 0)) {}
-
- /* Handle the AUTH extension. If the value given is not "<>" and either
- the ACL says "yes" or there is no ACL but the sending host is
- authenticated, we set it up as the authenticated sender. However, if the
- authenticator set a condition to be tested, we ignore AUTH on MAIL unless
- the condition is met. The value of AUTH is an xtext, which means that +,
- = and cntrl chars are coded in hex; however "<>" is unaffected by this
- coding. */
-
- else if (strcmpic(name, US"AUTH") == 0)
+ switch(mail_args->value)
{
- if (Ustrcmp(value, "<>") != 0)
- {
- int rc;
- uschar *ignore_msg;
-
- if (auth_xtextdecode(value, &authenticated_sender) < 0)
- {
- /* Put back terminator overrides for error message */
- name[-1] = ' ';
- value[-1] = '=';
- done = synprot_error(L_smtp_syntax_error, 501, NULL,
- US"invalid data for AUTH");
- goto COMMAND_LOOP;
- }
-
- if (acl_smtp_mailauth == NULL)
+ /* Handle SIZE= by reading the value. We don't do the check till later,
+ in order to be able to log the sender address on failure. */
+ case ENV_MAIL_OPT_SIZE:
+ if (((size = Ustrtoul(value, &end, 10)), *end == 0))
{
- ignore_msg = US"client not authenticated";
- rc = (sender_host_authenticated != NULL)? OK : FAIL;
+ if ((size == ULONG_MAX && errno == ERANGE) || size > INT_MAX)
+ size = INT_MAX;
+ message_size = (int)size;
}
else
- {
- ignore_msg = US"rejected by ACL";
- rc = acl_check(ACL_WHERE_MAILAUTH, NULL, acl_smtp_mailauth,
- &user_msg, &log_msg);
- }
+ arg_error = TRUE;
+ break;
+
+ /* If this session was initiated with EHLO and accept_8bitmime is set,
+ Exim will have indicated that it supports the BODY=8BITMIME option. In
+ fact, it does not support this according to the RFCs, in that it does not
+ take any special action for forwarding messages containing 8-bit
+ characters. That is why accept_8bitmime is not the default setting, but
+ some sites want the action that is provided. We recognize both "8BITMIME"
+ and "7BIT" as body types, but take no action. */
+ case ENV_MAIL_OPT_BODY:
+ if (accept_8bitmime) {
+ if (strcmpic(value, US"8BITMIME") == 0)
+ body_8bitmime = 8;
+ else if (strcmpic(value, US"7BIT") == 0)
+ body_8bitmime = 7;
+ else
+ {
+ body_8bitmime = 0;
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"invalid data for BODY");
+ goto COMMAND_LOOP;
+ }
+ DEBUG(D_receive) debug_printf("8BITMIME: %d\n", body_8bitmime);
+ break;
+ }
+ arg_error = TRUE;
+ break;
+
+ /* Handle the two DSN options, but only if configured to do so (which
+ will have caused "DSN" to be given in the EHLO response). The code itself
+ is included only if configured in at build time. */
+
+ case ENV_MAIL_OPT_RET:
+ if (dsn_advertised)
+ {
+ /* Check if RET has already been set */
+ if (dsn_ret > 0)
+ {
+ synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"RET can be specified once only");
+ goto COMMAND_LOOP;
+ }
+ dsn_ret = strcmpic(value, US"HDRS") == 0
+ ? dsn_ret_hdrs
+ : strcmpic(value, US"FULL") == 0
+ ? dsn_ret_full
+ : 0;
+ DEBUG(D_receive) debug_printf("DSN_RET: %d\n", dsn_ret);
+ /* Check for invalid invalid value, and exit with error */
+ if (dsn_ret == 0)
+ {
+ synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"Value for RET is invalid");
+ goto COMMAND_LOOP;
+ }
+ }
+ break;
+ case ENV_MAIL_OPT_ENVID:
+ if (dsn_advertised)
+ {
+ /* Check if the dsn envid has been already set */
+ if (dsn_envid != NULL)
+ {
+ synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"ENVID can be specified once only");
+ goto COMMAND_LOOP;
+ }
+ dsn_envid = string_copy(value);
+ DEBUG(D_receive) debug_printf("DSN_ENVID: %s\n", dsn_envid);
+ }
+ break;
- switch (rc)
+ /* Handle the AUTH extension. If the value given is not "<>" and either
+ the ACL says "yes" or there is no ACL but the sending host is
+ authenticated, we set it up as the authenticated sender. However, if the
+ authenticator set a condition to be tested, we ignore AUTH on MAIL unless
+ the condition is met. The value of AUTH is an xtext, which means that +,
+ = and cntrl chars are coded in hex; however "<>" is unaffected by this
+ coding. */
+ case ENV_MAIL_OPT_AUTH:
+ if (Ustrcmp(value, "<>") != 0)
{
- case OK:
- if (authenticated_by == NULL ||
- authenticated_by->mail_auth_condition == NULL ||
- expand_check_condition(authenticated_by->mail_auth_condition,
- authenticated_by->name, US"authenticator"))
- break; /* Accept the AUTH */
-
- ignore_msg = US"server_mail_auth_condition failed";
- if (authenticated_id != NULL)
- ignore_msg = string_sprintf("%s: authenticated ID=\"%s\"",
- ignore_msg, authenticated_id);
-
- /* Fall through */
-
- case FAIL:
- authenticated_sender = NULL;
- log_write(0, LOG_MAIN, "ignoring AUTH=%s from %s (%s)",
- value, host_and_ident(TRUE), ignore_msg);
- break;
+ int rc;
+ uschar *ignore_msg;
- /* Should only get DEFER or ERROR here. Put back terminator
- overrides for error message */
+ if (auth_xtextdecode(value, &authenticated_sender) < 0)
+ {
+ /* Put back terminator overrides for error message */
+ value[-1] = '=';
+ name[-1] = ' ';
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"invalid data for AUTH");
+ goto COMMAND_LOOP;
+ }
+ if (acl_smtp_mailauth == NULL)
+ {
+ ignore_msg = US"client not authenticated";
+ rc = (sender_host_authenticated != NULL)? OK : FAIL;
+ }
+ else
+ {
+ ignore_msg = US"rejected by ACL";
+ rc = acl_check(ACL_WHERE_MAILAUTH, NULL, acl_smtp_mailauth,
+ &user_msg, &log_msg);
+ }
- default:
- name[-1] = ' ';
- value[-1] = '=';
- (void)smtp_handle_acl_fail(ACL_WHERE_MAILAUTH, rc, user_msg,
- log_msg);
- goto COMMAND_LOOP;
+ switch (rc)
+ {
+ case OK:
+ if (authenticated_by == NULL ||
+ authenticated_by->mail_auth_condition == NULL ||
+ expand_check_condition(authenticated_by->mail_auth_condition,
+ authenticated_by->name, US"authenticator"))
+ break; /* Accept the AUTH */
+
+ ignore_msg = US"server_mail_auth_condition failed";
+ if (authenticated_id != NULL)
+ ignore_msg = string_sprintf("%s: authenticated ID=\"%s\"",
+ ignore_msg, authenticated_id);
+
+ /* Fall through */
+
+ case FAIL:
+ authenticated_sender = NULL;
+ log_write(0, LOG_MAIN, "ignoring AUTH=%s from %s (%s)",
+ value, host_and_ident(TRUE), ignore_msg);
+ break;
+
+ /* Should only get DEFER or ERROR here. Put back terminator
+ overrides for error message */
+
+ default:
+ value[-1] = '=';
+ name[-1] = ' ';
+ (void)smtp_handle_acl_fail(ACL_WHERE_MAILAUTH, rc, user_msg,
+ log_msg);
+ goto COMMAND_LOOP;
+ }
}
- }
- }
+ break;
- /* Unknown option. Stick back the terminator characters and break
- the loop. An error for a malformed address will occur. */
+#ifndef DISABLE_PRDR
+ case ENV_MAIL_OPT_PRDR:
+ if (prdr_enable)
+ prdr_requested = TRUE;
+ break;
+#endif
- else
- {
- name[-1] = ' ';
- value[-1] = '=';
- break;
+#ifdef SUPPORT_I18N
+ case ENV_MAIL_OPT_UTF8:
+ if (smtputf8_advertised)
+ {
+ int old_pool = store_pool;
+
+ DEBUG(D_receive) debug_printf("smtputf8 requested\n");
+ message_smtputf8 = allow_utf8_domains = TRUE;
+ store_pool = POOL_PERM;
+ received_protocol = string_sprintf("utf8%s", received_protocol);
+ store_pool = old_pool;
+ }
+ break;
+#endif
+ /* No valid option. Stick back the terminator characters and break
+ the loop. Do the name-terminator second as extract_option sets
+ value==name when it found no equal-sign.
+ An error for a malformed address will occur. */
+ case ENV_MAIL_OPT_NULL:
+ value[-1] = '=';
+ name[-1] = ' ';
+ arg_error = TRUE;
+ break;
+
+ default: assert(0);
}
+ /* Break out of for loop if switch() had bad argument or
+ when start of the email address is reached */
+ if (arg_error) break;
}
/* If we have passed the threshold for rate limiting, apply the current
/* Now extract the address, first applying any SMTP-time rewriting. The
TRUE flag allows "<>" as a sender address. */
- raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_cmd_argument, rewrite_smtp, NULL, FALSE, US"",
- global_rewrite_rules) : smtp_cmd_argument;
+ raw_sender = rewrite_existflags & rewrite_smtp
+ ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
+ global_rewrite_rules)
+ : smtp_cmd_data;
- /* rfc821_domains = TRUE; << no longer needed */
raw_sender =
parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain,
TRUE);
- /* rfc821_domains = FALSE; << no longer needed */
- if (raw_sender == NULL)
+ if (!raw_sender)
{
- done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_argument, errmess);
+ done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess);
break;
}
else
{
smtp_printf("501 %s: sender address must contain a domain\r\n",
- smtp_cmd_argument);
+ smtp_cmd_data);
log_write(L_smtp_syntax_error,
LOG_MAIN|LOG_REJECT,
"unqualified sender rejected: <%s> %s%s",
}
}
- /* Apply an ACL check if one is defined, before responding */
+ /* Apply an ACL check if one is defined, before responding. Afterwards,
+ when pipelining is not advertised, do another sync check in case the ACL
+ delayed and the client started sending in the meantime. */
- rc = (acl_smtp_mail == NULL)? OK :
- acl_check(ACL_WHERE_MAIL, NULL, acl_smtp_mail, &user_msg, &log_msg);
+ if (acl_smtp_mail)
+ {
+ rc = acl_check(ACL_WHERE_MAIL, NULL, acl_smtp_mail, &user_msg, &log_msg);
+ if (rc == OK && !pipelining_advertised && !check_sync())
+ goto SYNC_FAILURE;
+ }
+ else
+ rc = OK;
if (rc == OK || rc == DISCARD)
{
- smtp_printf("250 OK\r\n");
+ if (!user_msg)
+ smtp_printf("%s%s%s", US"250 OK",
+ #ifndef DISABLE_PRDR
+ prdr_requested ? US", PRDR Requested" : US"",
+ #else
+ US"",
+ #endif
+ US"\r\n");
+ else
+ {
+ #ifndef DISABLE_PRDR
+ if (prdr_requested)
+ user_msg = string_sprintf("%s%s", user_msg, US", PRDR Requested");
+ #endif
+ smtp_user_msg(US"250", user_msg);
+ }
smtp_delay_rcpt = smtp_rlr_base;
recipients_discarded = (rc == DISCARD);
was_rej_mail = FALSE;
}
-
else
{
done = smtp_handle_acl_fail(ACL_WHERE_MAIL, rc, user_msg, log_msg);
break;
- /* The RCPT command requires an address as an operand. All we do
- here is to parse it for syntactic correctness. There may be any number
- of RCPT commands, specifying multiple senders. We build them all into
- a data structure that is in argc/argv format. The start/end values
- given by parse_extract_address are not used, as we keep only the
- extracted address. */
+ /* The RCPT command requires an address as an operand. There may be any
+ number of RCPT commands, specifying multiple recipients. We build them all
+ into a data structure. The start/end values given by parse_extract_address
+ are not used, as we keep only the extracted address. */
case RCPT_CMD:
+ HAD(SCH_RCPT);
rcpt_count++;
- was_rcpt = TRUE;
+ was_rcpt = rcpt_in_progress = TRUE;
/* There must be a sender address; if the sender was rejected and
pipelining was advertised, we assume the client was pipelining, and do not
/* Check for an operand */
- if (smtp_cmd_argument[0] == 0)
+ if (smtp_cmd_data[0] == 0)
{
done = synprot_error(L_smtp_syntax_error, 501, NULL,
US"RCPT must have an address operand");
break;
}
+ /* Set the DSN flags orcpt and dsn_flags from the session*/
+ orcpt = NULL;
+ flags = 0;
+
+ if (esmtp) for(;;)
+ {
+ uschar *name, *value;
+
+ if (!extract_option(&name, &value))
+ break;
+
+ if (dsn_advertised && strcmpic(name, US"ORCPT") == 0)
+ {
+ /* Check whether orcpt has been already set */
+ if (orcpt)
+ {
+ synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"ORCPT can be specified once only");
+ goto COMMAND_LOOP;
+ }
+ orcpt = string_copy(value);
+ DEBUG(D_receive) debug_printf("DSN orcpt: %s\n", orcpt);
+ }
+
+ else if (dsn_advertised && strcmpic(name, US"NOTIFY") == 0)
+ {
+ /* Check if the notify flags have been already set */
+ if (flags > 0)
+ {
+ synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"NOTIFY can be specified once only");
+ goto COMMAND_LOOP;
+ }
+ if (strcmpic(value, US"NEVER") == 0)
+ flags |= rf_notify_never;
+ else
+ {
+ uschar *p = value;
+ while (*p != 0)
+ {
+ uschar *pp = p;
+ while (*pp != 0 && *pp != ',') pp++;
+ if (*pp == ',') *pp++ = 0;
+ if (strcmpic(p, US"SUCCESS") == 0)
+ {
+ DEBUG(D_receive) debug_printf("DSN: Setting notify success\n");
+ flags |= rf_notify_success;
+ }
+ else if (strcmpic(p, US"FAILURE") == 0)
+ {
+ DEBUG(D_receive) debug_printf("DSN: Setting notify failure\n");
+ flags |= rf_notify_failure;
+ }
+ else if (strcmpic(p, US"DELAY") == 0)
+ {
+ DEBUG(D_receive) debug_printf("DSN: Setting notify delay\n");
+ flags |= rf_notify_delay;
+ }
+ else
+ {
+ /* Catch any strange values */
+ synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"Invalid value for NOTIFY parameter");
+ goto COMMAND_LOOP;
+ }
+ p = pp;
+ }
+ DEBUG(D_receive) debug_printf("DSN Flags: %x\n", flags);
+ }
+ }
+
+ /* Unknown option. Stick back the terminator characters and break
+ the loop. An error for a malformed address will occur. */
+
+ else
+ {
+ DEBUG(D_receive) debug_printf("Invalid RCPT option: %s : %s\n", name, value);
+ name[-1] = ' ';
+ value[-1] = '=';
+ break;
+ }
+ }
+
/* Apply SMTP rewriting then extract the working address. Don't allow "<>"
as a recipient address */
- recipient = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_cmd_argument, rewrite_smtp, NULL, FALSE, US"",
- global_rewrite_rules) : smtp_cmd_argument;
-
- /* rfc821_domains = TRUE; << no longer needed */
- recipient = parse_extract_address(recipient, &errmess, &start, &end,
- &recipient_domain, FALSE);
- /* rfc821_domains = FALSE; << no longer needed */
+ recipient = rewrite_existflags & rewrite_smtp
+ ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
+ global_rewrite_rules)
+ : smtp_cmd_data;
- if (recipient == NULL)
+ if (!(recipient = parse_extract_address(recipient, &errmess, &start, &end,
+ &recipient_domain, FALSE)))
{
- done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_argument, errmess);
+ done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess);
rcpt_fail_count++;
break;
}
friends now makes it absolutely clear that it means *mailbox*. Consequently
we must always qualify this address, regardless. */
- if (recipient_domain == 0)
- {
- if (allow_unqualified_recipient ||
- strcmpic(recipient, US"postmaster") == 0)
- {
- DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
- recipient);
- recipient_domain = Ustrlen(recipient) + 1;
- recipient = rewrite_address_qualify(recipient, TRUE);
- }
- else
+ if (!recipient_domain)
+ if (!(recipient_domain = qualify_recipient(&recipient, smtp_cmd_data,
+ US"recipient")))
{
rcpt_fail_count++;
- smtp_printf("501 %s: recipient address must contain a domain\r\n",
- smtp_cmd_argument);
- log_write(L_smtp_syntax_error,
- LOG_MAIN|LOG_REJECT, "unqualified recipient rejected: "
- "<%s> %s%s", recipient, host_and_ident(TRUE),
- host_lookup_msg);
break;
}
- }
/* Check maximum allowed */
}
/* If the MAIL ACL discarded all the recipients, we bypass ACL checking
- for them. Otherwise, check the access control list for this recipient. */
+ for them. Otherwise, check the access control list for this recipient. As
+ there may be a delay in this, re-check for a synchronization error
+ afterwards, unless pipelining was advertised. */
- rc = recipients_discarded? DISCARD :
- acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg, &log_msg);
+ if (recipients_discarded)
+ rc = DISCARD;
+ else
+ if ( (rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg,
+ &log_msg)) == OK
+ && !pipelining_advertised && !check_sync())
+ goto SYNC_FAILURE;
/* The ACL was happy */
if (rc == OK)
{
- smtp_printf("250 Accepted\r\n");
+ if (user_msg)
+ smtp_user_msg(US"250", user_msg);
+ else
+ smtp_printf("250 Accepted\r\n");
receive_add_recipient(recipient, -1);
+
+ /* Set the dsn flags in the recipients_list */
+ recipients_list[recipients_count-1].orcpt = orcpt;
+ recipients_list[recipients_count-1].dsn_flags = flags;
+
+ DEBUG(D_receive) debug_printf("DSN: orcpt: %s flags: %d\n",
+ recipients_list[recipients_count-1].orcpt,
+ recipients_list[recipients_count-1].dsn_flags);
}
/* The recipient was discarded */
else if (rc == DISCARD)
{
- smtp_printf("250 Accepted\r\n");
+ if (user_msg)
+ smtp_user_msg(US"250", user_msg);
+ else
+ smtp_printf("250 Accepted\r\n");
rcpt_fail_count++;
discarded = TRUE;
- log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> rejected RCPT %s: "
+ log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> RCPT %s: "
"discarded by %s ACL%s%s", host_and_ident(TRUE),
- (sender_address_unrewritten != NULL)?
- sender_address_unrewritten : sender_address,
+ sender_address_unrewritten? sender_address_unrewritten : sender_address,
smtp_cmd_argument, recipients_discarded? "MAIL" : "RCPT",
- (log_msg == NULL)? US"" : US": ",
- (log_msg == NULL)? US"" : log_msg);
+ log_msg ? US": " : US"", log_msg ? log_msg : US"");
}
/* Either the ACL failed the address, or it was deferred. */
DATA command.
The example in the pipelining RFC 2920 uses 554, but I use 503 here
- because it is the same whether pipelining is in use or not. */
+ because it is the same whether pipelining is in use or not.
+
+ If all the RCPT commands that precede DATA provoked the same error message
+ (often indicating some kind of system error), it is helpful to include it
+ with the DATA rejection (an idea suggested by Tony Finch). */
+
+ case BDAT_CMD:
+ HAD(SCH_BDAT);
+ {
+ int n;
+
+ if (chunking_state != CHUNKING_OFFERED)
+ {
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"BDAT command used when CHUNKING not advertised");
+ break;
+ }
+
+ /* grab size, endmarker */
+
+ if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1)
+ {
+ done = synprot_error(L_smtp_protocol_error, 501, NULL,
+ US"missing size for BDAT command");
+ break;
+ }
+ chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0
+ ? CHUNKING_LAST : CHUNKING_ACTIVE;
+ chunking_data_left = chunking_datasize;
+ DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n",
+ (int)chunking_state, chunking_data_left);
+
+ lwr_receive_getc = receive_getc;
+ lwr_receive_ungetc = receive_ungetc;
+ receive_getc = bdat_getc;
+ receive_ungetc = bdat_ungetc;
+
+ goto DATA_BDAT;
+ }
case DATA_CMD:
+ HAD(SCH_DATA);
+
+ DATA_BDAT: /* Common code for DATA and BDAT */
if (!discarded && recipients_count <= 0)
{
+ if (rcpt_smtp_response_same && rcpt_smtp_response != NULL)
+ {
+ uschar *code = US"503";
+ int len = Ustrlen(rcpt_smtp_response);
+ smtp_respond(code, 3, FALSE, US"All RCPT commands were rejected with "
+ "this error:");
+ /* Responses from smtp_printf() will have \r\n on the end */
+ if (len > 2 && rcpt_smtp_response[len-2] == '\r')
+ rcpt_smtp_response[len-2] = 0;
+ smtp_respond(code, 3, FALSE, rcpt_smtp_response);
+ }
if (pipelining_advertised && last_was_rcpt)
- smtp_printf("503 valid RCPT command must precede DATA\r\n");
+ smtp_printf("503 Valid RCPT command must precede %s\r\n",
+ smtp_names[smtp_connection_had[smtp_ch_index-1]]);
else
done = synprot_error(L_smtp_protocol_error, 503, NULL,
- US"valid RCPT command must precede DATA");
+ smtp_connection_had[smtp_ch_index-1] == SCH_DATA
+ ? US"valid RCPT command must precede DATA"
+ : US"valid RCPT command must precede BDAT");
+
+ if (chunking_state > CHUNKING_OFFERED)
+ bdat_flush_data();
break;
}
break;
}
- if (acl_smtp_predata == NULL) rc = OK; else
+ if (chunking_state > CHUNKING_OFFERED)
+ rc = OK; /* No predata ACL or go-ahead output for BDAT */
+ else
{
- enable_dollar_recipients = TRUE;
- rc = acl_check(ACL_WHERE_PREDATA, NULL, acl_smtp_predata, &user_msg,
- &log_msg);
- enable_dollar_recipients = FALSE;
- }
+ /* If there is an ACL, re-check the synchronization afterwards, since the
+ ACL may have delayed. To handle cutthrough delivery enforce a dummy call
+ to get the DATA command sent. */
- if (rc == OK)
- {
- smtp_printf("354 Enter message, ending with \".\" on a line by itself\r\n");
- done = 3;
- message_ended = END_NOTENDED; /* Indicate in middle of data */
+ if (acl_smtp_predata == NULL && cutthrough.fd < 0)
+ rc = OK;
+ else
+ {
+ uschar * acl = acl_smtp_predata ? acl_smtp_predata : US"accept";
+ enable_dollar_recipients = TRUE;
+ rc = acl_check(ACL_WHERE_PREDATA, NULL, acl, &user_msg,
+ &log_msg);
+ enable_dollar_recipients = FALSE;
+ if (rc == OK && !check_sync())
+ goto SYNC_FAILURE;
+
+ if (rc != OK)
+ { /* Either the ACL failed the address, or it was deferred. */
+ done = smtp_handle_acl_fail(ACL_WHERE_PREDATA, rc, user_msg, log_msg);
+ break;
+ }
+ }
+
+ if (user_msg)
+ smtp_user_msg(US"354", user_msg);
+ else
+ smtp_printf(
+ "354 Enter message, ending with \".\" on a line by itself\r\n");
}
- /* Either the ACL failed the address, or it was deferred. */
-
- else
- done = smtp_handle_acl_fail(ACL_WHERE_PREDATA, rc, user_msg, log_msg);
+#ifdef TCP_QUICKACK
+ if (smtp_in) /* all ACKs needed to ramp window up for bulk data */
+ (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
+ US &on, sizeof(on));
+#endif
+ done = 3;
+ message_ended = END_NOTENDED; /* Indicate in middle of data */
break;
case VRFY_CMD:
- rc = acl_check(ACL_WHERE_VRFY, NULL, acl_smtp_vrfy, &user_msg, &log_msg);
- if (rc != OK)
- done = smtp_handle_acl_fail(ACL_WHERE_VRFY, rc, user_msg, log_msg);
- else
{
- uschar *address;
- uschar *s = NULL;
-
- /* rfc821_domains = TRUE; << no longer needed */
- address = parse_extract_address(smtp_cmd_argument, &errmess, &start, &end,
- &recipient_domain, FALSE);
- /* rfc821_domains = FALSE; << no longer needed */
+ uschar * address;
- if (address == NULL)
- s = string_sprintf("501 %s", errmess);
- else
- {
- address_item *addr = deliver_make_addr(address, FALSE);
- switch(verify_address(addr, NULL, vopt_is_recipient | vopt_qualify, -1,
- -1, -1, NULL, NULL, NULL))
- {
- case OK:
- s = string_sprintf("250 <%s> is deliverable", address);
- break;
+ HAD(SCH_VRFY);
- case DEFER:
- s = (addr->user_message != NULL)?
- string_sprintf("451 <%s> %s", address, addr->user_message) :
- string_sprintf("451 Cannot resolve <%s> at this time", address);
- break;
+ if (!(address = parse_extract_address(smtp_cmd_data, &errmess,
+ &start, &end, &recipient_domain, FALSE)))
+ {
+ smtp_printf("501 %s\r\n", errmess);
+ break;
+ }
- case FAIL:
- s = (addr->user_message != NULL)?
- string_sprintf("550 <%s> %s", address, addr->user_message) :
- string_sprintf("550 <%s> is not deliverable", address);
- log_write(0, LOG_MAIN, "VRFY failed for %s %s",
- smtp_cmd_argument, host_and_ident(TRUE));
- break;
- }
- }
+ if (!recipient_domain)
+ if (!(recipient_domain = qualify_recipient(&address, smtp_cmd_data,
+ US"verify")))
+ break;
- smtp_printf("%s\r\n", s);
+ if ((rc = acl_check(ACL_WHERE_VRFY, address, acl_smtp_vrfy,
+ &user_msg, &log_msg)) != OK)
+ done = smtp_handle_acl_fail(ACL_WHERE_VRFY, rc, user_msg, log_msg);
+ else
+ {
+ uschar * s = NULL;
+ address_item * addr = deliver_make_addr(address, FALSE);
+
+ switch(verify_address(addr, NULL, vopt_is_recipient | vopt_qualify, -1,
+ -1, -1, NULL, NULL, NULL))
+ {
+ case OK:
+ s = string_sprintf("250 <%s> is deliverable", address);
+ break;
+
+ case DEFER:
+ s = (addr->user_message != NULL)?
+ string_sprintf("451 <%s> %s", address, addr->user_message) :
+ string_sprintf("451 Cannot resolve <%s> at this time", address);
+ break;
+
+ case FAIL:
+ s = (addr->user_message != NULL)?
+ string_sprintf("550 <%s> %s", address, addr->user_message) :
+ string_sprintf("550 <%s> is not deliverable", address);
+ log_write(0, LOG_MAIN, "VRFY failed for %s %s",
+ smtp_cmd_argument, host_and_ident(TRUE));
+ break;
+ }
+
+ smtp_printf("%s\r\n", s);
+ }
+ break;
}
- break;
case EXPN_CMD:
+ HAD(SCH_EXPN);
rc = acl_check(ACL_WHERE_EXPN, NULL, acl_smtp_expn, &user_msg, &log_msg);
if (rc != OK)
done = smtp_handle_acl_fail(ACL_WHERE_EXPN, rc, user_msg, log_msg);
{
BOOL save_log_testing_mode = log_testing_mode;
address_test_mode = log_testing_mode = TRUE;
- (void) verify_address(deliver_make_addr(smtp_cmd_argument, FALSE),
+ (void) verify_address(deliver_make_addr(smtp_cmd_data, FALSE),
smtp_out, vopt_is_recipient | vopt_qualify | vopt_expn, -1, -1, -1,
NULL, NULL, NULL);
address_test_mode = FALSE;
#ifdef SUPPORT_TLS
case STARTTLS_CMD:
+ HAD(SCH_STARTTLS);
if (!tls_advertised)
{
done = synprot_error(L_smtp_protocol_error, 503, NULL,
/* Apply an ACL check if one is defined */
- if (acl_smtp_starttls != NULL)
+ if ( acl_smtp_starttls
+ && (rc = acl_check(ACL_WHERE_STARTTLS, NULL, acl_smtp_starttls,
+ &user_msg, &log_msg)) != OK
+ )
{
- rc = acl_check(ACL_WHERE_STARTTLS, NULL, acl_smtp_starttls, &user_msg,
- &log_msg);
- if (rc != OK)
- {
- done = smtp_handle_acl_fail(ACL_WHERE_STARTTLS, rc, user_msg, log_msg);
- break;
- }
+ done = smtp_handle_acl_fail(ACL_WHERE_STARTTLS, rc, user_msg, log_msg);
+ break;
}
/* RFC 2487 is not clear on when this command may be sent, though it
does state that all information previously obtained from the client
- must be discarded if a TLS session is started. It seems reasonble to
+ must be discarded if a TLS session is started. It seems reasonable to
do an implied RSET when STARTTLS is received. */
incomplete_transaction_log(US"STARTTLS");
toomany = FALSE;
cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = FALSE;
+ /* There's an attack where more data is read in past the STARTTLS command
+ before TLS is negotiated, then assumed to be part of the secure session
+ when used afterwards; we use segregated input buffers, so are not
+ vulnerable, but we want to note when it happens and, for sheer paranoia,
+ ensure that the buffer is "wiped".
+ Pipelining sync checks will normally have protected us too, unless disabled
+ by configuration. */
+
+ if (receive_smtp_buffered())
+ {
+ DEBUG(D_any)
+ debug_printf("Non-empty input buffer after STARTTLS; naive attack?\n");
+ if (tls_in.active < 0)
+ smtp_inend = smtp_inptr = smtp_inbuffer;
+ /* and if TLS is already active, tls_server_start() should fail */
+ }
+
+ /* There is nothing we value in the input buffer and if TLS is successfully
+ negotiated, we won't use this buffer again; if TLS fails, we'll just read
+ fresh content into it. The buffer contains arbitrary content from an
+ untrusted remote source; eg: NOOP <shellcode>\r\nSTARTTLS\r\n
+ It seems safest to just wipe away the content rather than leave it as a
+ target to jump to. */
+
+ memset(smtp_inbuffer, 0, IN_BUFFER_SIZE);
+
/* Attempt to start up a TLS session, and if successful, discard all
knowledge that was obtained previously. At least, that's what the RFC says,
and that's what happens by default. However, in order to work round YAEB,
We must allow for an extra EHLO command and an extra AUTH command after
STARTTLS that don't add to the nonmail command count. */
- if ((rc = tls_server_start(tls_require_ciphers)) == OK)
+ s = NULL;
+ if ((rc = tls_server_start(tls_require_ciphers, &s)) == OK)
{
if (!tls_remember_esmtp)
helo_seen = esmtp = auth_advertised = pipelining_advertised = FALSE;
cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE;
cmd_list[CMD_LIST_AUTH].is_mail_cmd = TRUE;
+ cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE;
if (sender_helo_name != NULL)
{
store_free(sender_helo_name);
set_process_info("handling incoming TLS connection from %s",
host_and_ident(FALSE));
}
- received_protocol = (esmtp?
- protocols[pextend + pcrpted +
- ((sender_host_authenticated != NULL)? pauthed : 0)]
- :
- protocols[pnormal + pcrpted])
- +
- ((sender_host_address != NULL)? pnlocal : 0);
+ received_protocol =
+ (sender_host_address ? protocols : protocols_local)
+ [ (esmtp
+ ? pextend + (sender_host_authenticated ? pauthed : 0)
+ : pnormal)
+ + (tls_in.active >= 0 ? pcrpted : 0)
+ ];
sender_host_authenticated = NULL;
authenticated_id = NULL;
DEBUG(D_tls) debug_printf("TLS active\n");
break; /* Successful STARTTLS */
}
+ else
+ (void) smtp_log_tls_fail(s);
/* Some local configuration problem was discovered before actually trying
to do a TLS handshake; give a temporary error. */
- else if (rc == DEFER)
+ if (rc == DEFER)
{
smtp_printf("454 TLS currently unavailable\r\n");
break;
}
/* Hard failure. Reject everything except QUIT or closed connection. One
- cause for failure is a nested STARTTLS, in which case tls_active remains
+ cause for failure is a nested STARTTLS, in which case tls_in.active remains
set, but we must still reject all incoming commands. */
DEBUG(D_tls) debug_printf("TLS failed to start\n");
- while (done <= 0)
+ while (done <= 0) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
{
- switch(smtp_read_command(FALSE))
- {
- case EOF_CMD:
- log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF",
- smtp_get_connection_info());
- done = 2;
- break;
-
- case QUIT_CMD:
- smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
- log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
- smtp_get_connection_info());
- done = 2;
- break;
+ case EOF_CMD:
+ log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF",
+ smtp_get_connection_info());
+ smtp_notquit_exit(US"tls-failed", NULL, NULL);
+ done = 2;
+ break;
+
+ /* It is perhaps arguable as to which exit ACL should be called here,
+ but as it is probably a situation that almost never arises, it
+ probably doesn't matter. We choose to call the real QUIT ACL, which in
+ some sense is perhaps "right". */
+
+ case QUIT_CMD:
+ user_msg = NULL;
+ if ( acl_smtp_quit
+ && ((rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg,
+ &log_msg)) == ERROR))
+ log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
+ log_msg);
+ if (user_msg)
+ smtp_respond(US"221", 3, TRUE, user_msg);
+ else
+ smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
+ log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
+ smtp_get_connection_info());
+ done = 2;
+ break;
- default:
- smtp_printf("554 Security failure\r\n");
- break;
- }
+ default:
+ smtp_printf("554 Security failure\r\n");
+ break;
}
- tls_close(TRUE);
+ tls_close(TRUE, TRUE);
break;
#endif
message. */
case QUIT_CMD:
- incomplete_transaction_log(US"QUIT");
-
- if (acl_smtp_quit != NULL)
- {
- rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit,&user_msg,&log_msg);
- if (rc == ERROR)
- log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
- log_msg);
- }
- else user_msg = NULL;
-
- if (user_msg == NULL)
- smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
- else
- smtp_printf("221 %s\r\n", user_msg);
-
- #ifdef SUPPORT_TLS
- tls_close(TRUE);
- #endif
-
+ smtp_quit_handler(&user_msg, &log_msg);
done = 2;
- log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
- smtp_get_connection_info());
break;
case RSET_CMD:
- incomplete_transaction_log(US"RSET");
+ smtp_rset_handler();
smtp_reset(reset_point);
toomany = FALSE;
- smtp_printf("250 Reset OK\r\n");
- cmd_list[CMD_LIST_RSET].is_mail_cmd = FALSE;
break;
case NOOP_CMD:
+ HAD(SCH_NOOP);
smtp_printf("250 OK\r\n");
break;
- /* Show ETRN/EXPN/VRFY if there's
- an ACL for checking hosts; if actually used, a check will be done for
- permitted hosts. */
+ /* Show ETRN/EXPN/VRFY if there's an ACL for checking hosts; if actually
+ used, a check will be done for permitted hosts. Show STARTTLS only if not
+ already in a TLS session and if it would be advertised in the EHLO
+ response. */
case HELP_CMD:
+ HAD(SCH_HELP);
smtp_printf("214-Commands supported:\r\n");
{
uschar buffer[256];
buffer[0] = 0;
Ustrcat(buffer, " AUTH");
#ifdef SUPPORT_TLS
- Ustrcat(buffer, " STARTTLS");
+ if (tls_in.active < 0 &&
+ verify_check_host(&tls_advertise_hosts) != FAIL)
+ Ustrcat(buffer, " STARTTLS");
#endif
- Ustrcat(buffer, " HELO EHLO MAIL RCPT DATA");
+ Ustrcat(buffer, " HELO EHLO MAIL RCPT DATA BDAT");
Ustrcat(buffer, " NOOP QUIT RSET HELP");
if (acl_smtp_etrn != NULL) Ustrcat(buffer, " ETRN");
if (acl_smtp_expn != NULL) Ustrcat(buffer, " EXPN");
case EOF_CMD:
incomplete_transaction_log(US"connection lost");
- smtp_printf("421 %s lost input connection\r\n", smtp_active_hostname);
+ smtp_notquit_exit(US"connection-lost", US"421",
+ US"%s lost input connection", smtp_active_hostname);
/* Don't log by default unless in the middle of a message, as some mailers
just drop the call rather than sending QUIT, and it clutters up the logs.
case ETRN_CMD:
+ HAD(SCH_ETRN);
if (sender_address != NULL)
{
done = synprot_error(L_smtp_protocol_error, 503, NULL,
log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_cmd_argument,
host_and_ident(FALSE));
- rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn, &user_msg, &log_msg);
- if (rc != OK)
+ if ((rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn,
+ &user_msg, &log_msg)) != OK)
{
done = smtp_handle_acl_fail(ACL_WHERE_ETRN, rc, user_msg, log_msg);
break;
/* Compute the serialization key for this command. */
- etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_argument);
+ etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_data);
/* If a command has been specified for running as a result of ETRN, we
permit any argument to ETRN. If not, only the # standard form is permitted,
uschar *error;
BOOL rc;
etrn_command = smtp_etrn_command;
- deliver_domain = smtp_cmd_argument;
+ deliver_domain = smtp_cmd_data;
rc = transport_set_up_command(&argv, smtp_etrn_command, TRUE, 0, NULL,
US"ETRN processing", &error);
deliver_domain = NULL;
else
{
- if (*smtp_cmd_argument++ != '#')
+ if (*smtp_cmd_data++ != '#')
{
done = synprot_error(L_smtp_syntax_error, 501, NULL,
US"argument must begin with #");
break;
}
etrn_command = US"exim -R";
- argv = child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE, 2, US"-R",
- smtp_cmd_argument);
+ argv = CUSS child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE,
+ *queue_name ? 4 : 2,
+ US"-R", smtp_cmd_data,
+ US"-MCG", queue_name);
}
/* If we are host-testing, don't actually do anything. */
debug_printf("ETRN command is: %s\n", etrn_command);
debug_printf("ETRN command execution skipped\n");
}
- smtp_printf("250 OK\r\n");
+ if (user_msg == NULL) smtp_printf("250 OK\r\n");
+ else smtp_user_msg(US"250", user_msg);
break;
}
/* If ETRN queue runs are to be serialized, check the database to
ensure one isn't already running. */
- if (smtp_etrn_serialize && !enq_start(etrn_serialize_key))
+ if (smtp_etrn_serialize && !enq_start(etrn_serialize_key, 1))
{
- smtp_printf("458 Already processing %s\r\n", smtp_cmd_argument);
+ smtp_printf("458 Already processing %s\r\n", smtp_cmd_data);
break;
}
smtp_printf("458 Unable to fork process\r\n");
if (smtp_etrn_serialize) enq_end(etrn_serialize_key);
}
- else smtp_printf("250 OK\r\n");
+ else
+ {
+ if (user_msg == NULL) smtp_printf("250 OK\r\n");
+ else smtp_user_msg(US"250", user_msg);
+ }
signal(SIGCHLD, oldsignal);
break;
case BADSYN_CMD:
- if (smtp_inend >= smtp_inbuffer + in_buffer_size)
- smtp_inend = smtp_inbuffer + in_buffer_size - 1;
+ SYNC_FAILURE:
+ if (smtp_inend >= smtp_inbuffer + IN_BUFFER_SIZE)
+ smtp_inend = smtp_inbuffer + IN_BUFFER_SIZE - 1;
c = smtp_inend - smtp_inptr;
if (c > 150) c = 150;
smtp_inptr[c] = 0;
pipelining_advertised? "" : " not",
smtp_cmd_buffer, host_and_ident(TRUE),
string_printing(smtp_inptr));
- smtp_printf("554 SMTP synchronization error\r\n");
+ smtp_notquit_exit(US"synchronization-error", US"554",
+ US"SMTP synchronization error");
done = 1; /* Pretend eof - drops connection */
break;
case TOO_MANY_NONMAIL_CMD:
+ s = smtp_cmd_buffer;
+ while (*s != 0 && !isspace(*s)) s++;
incomplete_transaction_log(US"too many non-mail commands");
log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
"nonmail commands (last was \"%.*s\")", host_and_ident(FALSE),
- smtp_cmd_argument - smtp_cmd_buffer, smtp_cmd_buffer);
- smtp_printf("554 Too many nonmail commands\r\n");
+ (int)(s - smtp_cmd_buffer), smtp_cmd_buffer);
+ smtp_notquit_exit(US"bad-commands", US"554", US"Too many nonmail commands");
done = 1; /* Pretend eof - drops connection */
break;
+#ifdef SUPPORT_PROXY
+ case PROXY_FAIL_IGNORE_CMD:
+ smtp_printf("503 Command refused, required Proxy negotiation failed\r\n");
+ break;
+#endif
default:
if (unknown_command_count++ >= smtp_max_unknown_commands)
string_printing(smtp_cmd_buffer), host_and_ident(TRUE),
US"unrecognized command");
incomplete_transaction_log(US"unrecognized command");
- smtp_printf("500 Too many unrecognized commands\r\n");
+ smtp_notquit_exit(US"bad-commands", US"500",
+ US"Too many unrecognized commands");
done = 2;
log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
"unrecognized commands (last was \"%s\")", host_and_ident(FALSE),
- smtp_cmd_buffer);
+ string_printing(smtp_cmd_buffer));
}
else
done = synprot_error(L_smtp_syntax_error, 500, NULL,
return done - 2; /* Convert yield values */
}
+/* vi: aw ai sw=2
+*/
/* End of smtp_in.c */
projects / exim.git / blobdiff