Fix error logged for send failure
[exim.git] / src / src / smtp_in.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
d4e5e70b 5/* Copyright (c) University of Cambridge 1995 - 2017 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8/* Functions for handling an incoming SMTP call. */
9
10
11#include "exim.h"
2ef7ed08 12#include <assert.h>
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13
14
15/* Initialize for TCP wrappers if so configured. It appears that the macro
16HAVE_IPV6 is used in some versions of the tcpd.h header, so we unset it before
17including that header, and restore its value afterwards. */
18
19#ifdef USE_TCP_WRAPPERS
20
21 #if HAVE_IPV6
22 #define EXIM_HAVE_IPV6
23 #endif
24 #undef HAVE_IPV6
25 #include <tcpd.h>
26 #undef HAVE_IPV6
27 #ifdef EXIM_HAVE_IPV6
28 #define HAVE_IPV6 TRUE
29 #endif
30
31int allow_severity = LOG_INFO;
32int deny_severity = LOG_NOTICE;
5dc43717 33uschar *tcp_wrappers_name;
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34#endif
35
36
8d67ada3
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37/* Size of buffer for reading SMTP commands. We used to use 512, as defined
38by RFC 821. However, RFC 1869 specifies that this must be increased for SMTP
39commands that accept arguments, and this in particular applies to AUTH, where
94431adb 40the data can be quite long. More recently this value was 2048 in Exim;
e2ca7082 41however, RFC 4954 (circa 2007) recommends 12288 bytes to handle AUTH. Clients
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42such as Thunderbird will send an AUTH with an initial-response for GSSAPI.
43The maximum size of a Kerberos ticket under Windows 2003 is 12000 bytes, and
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44we need room to handle large base64-encoded AUTHs for GSSAPI.
45*/
46
bd8fbe36 47#define SMTP_CMD_BUFFER_SIZE 16384
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48
49/* Size of buffer for reading SMTP incoming packets */
50
bd8fbe36 51#define IN_BUFFER_SIZE 8192
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52
53/* Structure for SMTP command list */
54
55typedef struct {
1ba28e2b 56 const char *name;
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57 int len;
58 short int cmd;
59 short int has_arg;
60 short int is_mail_cmd;
61} smtp_cmd_list;
62
63/* Codes for identifying commands. We order them so that those that come first
64are those for which synchronization is always required. Checking this can help
65block some spam. */
66
67enum {
68 /* These commands are required to be synchronized, i.e. to be the last in a
69 block of commands when pipelining. */
70
71 HELO_CMD, EHLO_CMD, DATA_CMD, /* These are listed in the pipelining */
72 VRFY_CMD, EXPN_CMD, NOOP_CMD, /* RFC as requiring synchronization */
73 ETRN_CMD, /* This by analogy with TURN from the RFC */
74 STARTTLS_CMD, /* Required by the STARTTLS RFC */
b3ef41c9 75 TLS_AUTH_CMD, /* auto-command at start of SSL */
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76
77 /* This is a dummy to identify the non-sync commands when pipelining */
78
79 NON_SYNC_CMD_PIPELINING,
80
81 /* These commands need not be synchronized when pipelining */
82
83 MAIL_CMD, RCPT_CMD, RSET_CMD,
84
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85 /* This is a dummy to identify the non-sync commands when not pipelining */
86
87 NON_SYNC_CMD_NON_PIPELINING,
88
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89 /* RFC3030 section 2: "After all MAIL and RCPT responses are collected and
90 processed the message is sent using a series of BDAT commands"
91 implies that BDAT should be synchronized. However, we see Google, at least,
92 sending MAIL,RCPT,BDAT-LAST in a single packet, clearly not waiting for
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93 processing of the RCPT response(s). We shall do the same, and not require
94 synch for BDAT. Worse, as the chunk may (very likely will) follow the
95 command-header in the same packet we cannot do the usual "is there any
4c04137d 96 follow-on data after the command line" even for non-pipeline mode.
f4630439 97 So we'll need an explicit check after reading the expected chunk amount
4c04137d 98 when non-pipe, before sending the ACK. */
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99
100 BDAT_CMD,
101
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102 /* I have been unable to find a statement about the use of pipelining
103 with AUTH, so to be on the safe side it is here, though I kind of feel
104 it should be up there with the synchronized commands. */
105
106 AUTH_CMD,
107
108 /* I'm not sure about these, but I don't think they matter. */
109
110 QUIT_CMD, HELP_CMD,
111
cee5f132 112#ifdef SUPPORT_PROXY
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113 PROXY_FAIL_IGNORE_CMD,
114#endif
115
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116 /* These are specials that don't correspond to actual commands */
117
118 EOF_CMD, OTHER_CMD, BADARG_CMD, BADCHAR_CMD, BADSYN_CMD,
119 TOO_MANY_NONMAIL_CMD };
120
121
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122/* This is a convenience macro for adding the identity of an SMTP command
123to the circular buffer that holds a list of the last n received. */
124
125#define HAD(n) \
126 smtp_connection_had[smtp_ch_index++] = n; \
127 if (smtp_ch_index >= SMTP_HBUFF_SIZE) smtp_ch_index = 0
128
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129
130/*************************************************
131* Local static variables *
132*************************************************/
133
134static auth_instance *authenticated_by;
135static BOOL auth_advertised;
136#ifdef SUPPORT_TLS
137static BOOL tls_advertised;
138#endif
6c1c3d1d 139static BOOL dsn_advertised;
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140static BOOL esmtp;
141static BOOL helo_required = FALSE;
142static BOOL helo_verify = FALSE;
143static BOOL helo_seen;
144static BOOL helo_accept_junk;
145static BOOL count_nonmail;
146static BOOL pipelining_advertised;
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147static BOOL rcpt_smtp_response_same;
148static BOOL rcpt_in_progress;
059ec3d9 149static int nonmail_command_count;
8f128379 150static BOOL smtp_exit_function_called = 0;
8c5d388a 151#ifdef SUPPORT_I18N
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152static BOOL smtputf8_advertised;
153#endif
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154static int synprot_error_count;
155static int unknown_command_count;
156static int sync_cmd_limit;
157static int smtp_write_error = 0;
158
2679d413 159static uschar *rcpt_smtp_response;
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160static uschar *smtp_data_buffer;
161static uschar *smtp_cmd_data;
162
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163/* We need to know the position of RSET, HELO, EHLO, AUTH, and STARTTLS. Their
164final fields of all except AUTH are forced TRUE at the start of a new message
165setup, to allow one of each between messages that is not counted as a nonmail
166command. (In fact, only one of HELO/EHLO is not counted.) Also, we have to
167allow a new EHLO after starting up TLS.
168
169AUTH is "falsely" labelled as a mail command initially, so that it doesn't get
170counted. However, the flag is changed when AUTH is received, so that multiple
171failing AUTHs will eventually hit the limit. After a successful AUTH, another
172AUTH is already forbidden. After a TLS session is started, AUTH's flag is again
173forced TRUE, to allow for the re-authentication that can happen at that point.
174
175QUIT is also "falsely" labelled as a mail command so that it doesn't up the
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176count of non-mail commands and possibly provoke an error.
177
178tls_auth is a pseudo-command, never expected in input. It is activated
179on TLS startup and looks for a tls authenticator. */
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180
181static smtp_cmd_list cmd_list[] = {
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182 /* name len cmd has_arg is_mail_cmd */
183
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184 { "rset", sizeof("rset")-1, RSET_CMD, FALSE, FALSE }, /* First */
185 { "helo", sizeof("helo")-1, HELO_CMD, TRUE, FALSE },
186 { "ehlo", sizeof("ehlo")-1, EHLO_CMD, TRUE, FALSE },
187 { "auth", sizeof("auth")-1, AUTH_CMD, TRUE, TRUE },
188 #ifdef SUPPORT_TLS
189 { "starttls", sizeof("starttls")-1, STARTTLS_CMD, FALSE, FALSE },
b3ef41c9 190 { "tls_auth", 0, TLS_AUTH_CMD, FALSE, TRUE },
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191 #endif
192
193/* If you change anything above here, also fix the definitions below. */
194
195 { "mail from:", sizeof("mail from:")-1, MAIL_CMD, TRUE, TRUE },
196 { "rcpt to:", sizeof("rcpt to:")-1, RCPT_CMD, TRUE, TRUE },
197 { "data", sizeof("data")-1, DATA_CMD, FALSE, TRUE },
18481de3 198 { "bdat", sizeof("bdat")-1, BDAT_CMD, TRUE, TRUE },
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199 { "quit", sizeof("quit")-1, QUIT_CMD, FALSE, TRUE },
200 { "noop", sizeof("noop")-1, NOOP_CMD, TRUE, FALSE },
201 { "etrn", sizeof("etrn")-1, ETRN_CMD, TRUE, FALSE },
202 { "vrfy", sizeof("vrfy")-1, VRFY_CMD, TRUE, FALSE },
203 { "expn", sizeof("expn")-1, EXPN_CMD, TRUE, FALSE },
204 { "help", sizeof("help")-1, HELP_CMD, TRUE, FALSE }
205};
206
207static smtp_cmd_list *cmd_list_end =
208 cmd_list + sizeof(cmd_list)/sizeof(smtp_cmd_list);
209
210#define CMD_LIST_RSET 0
211#define CMD_LIST_HELO 1
212#define CMD_LIST_EHLO 2
213#define CMD_LIST_AUTH 3
214#define CMD_LIST_STARTTLS 4
b3ef41c9 215#define CMD_LIST_TLS_AUTH 5
059ec3d9 216
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217/* This list of names is used for performing the smtp_no_mail logging action.
218It must be kept in step with the SCH_xxx enumerations. */
219
220static uschar *smtp_names[] =
221 {
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222 US"NONE", US"AUTH", US"DATA", US"BDAT", US"EHLO", US"ETRN", US"EXPN",
223 US"HELO", US"HELP", US"MAIL", US"NOOP", US"QUIT", US"RCPT", US"RSET",
224 US"STARTTLS", US"VRFY" };
b4ed4da0 225
e524074d 226static uschar *protocols_local[] = {
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227 US"local-smtp", /* HELO */
228 US"local-smtps", /* The rare case EHLO->STARTTLS->HELO */
229 US"local-esmtp", /* EHLO */
230 US"local-esmtps", /* EHLO->STARTTLS->EHLO */
231 US"local-esmtpa", /* EHLO->AUTH */
232 US"local-esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */
059ec3d9 233 };
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234static uschar *protocols[] = {
235 US"smtp", /* HELO */
236 US"smtps", /* The rare case EHLO->STARTTLS->HELO */
237 US"esmtp", /* EHLO */
238 US"esmtps", /* EHLO->STARTTLS->EHLO */
239 US"esmtpa", /* EHLO->AUTH */
240 US"esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */
241 };
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242
243#define pnormal 0
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244#define pextend 2
245#define pcrpted 1 /* added to pextend or pnormal */
246#define pauthed 2 /* added to pextend */
059ec3d9 247
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248/* Sanity check and validate optional args to MAIL FROM: envelope */
249enum {
2ef7ed08 250 ENV_MAIL_OPT_NULL,
d27f98fe 251 ENV_MAIL_OPT_SIZE, ENV_MAIL_OPT_BODY, ENV_MAIL_OPT_AUTH,
8ccd00b1 252#ifndef DISABLE_PRDR
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253 ENV_MAIL_OPT_PRDR,
254#endif
6c1c3d1d 255 ENV_MAIL_OPT_RET, ENV_MAIL_OPT_ENVID,
8c5d388a 256#ifdef SUPPORT_I18N
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257 ENV_MAIL_OPT_UTF8,
258#endif
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259 };
260typedef struct {
261 uschar * name; /* option requested during MAIL cmd */
262 int value; /* enum type */
263 BOOL need_value; /* TRUE requires value (name=value pair format)
264 FALSE is a singleton */
265 } env_mail_type_t;
266static env_mail_type_t env_mail_type_list[] = {
267 { US"SIZE", ENV_MAIL_OPT_SIZE, TRUE },
268 { US"BODY", ENV_MAIL_OPT_BODY, TRUE },
269 { US"AUTH", ENV_MAIL_OPT_AUTH, TRUE },
8ccd00b1 270#ifndef DISABLE_PRDR
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271 { US"PRDR", ENV_MAIL_OPT_PRDR, FALSE },
272#endif
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273 { US"RET", ENV_MAIL_OPT_RET, TRUE },
274 { US"ENVID", ENV_MAIL_OPT_ENVID, TRUE },
8c5d388a 275#ifdef SUPPORT_I18N
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276 { US"SMTPUTF8",ENV_MAIL_OPT_UTF8, FALSE }, /* rfc6531 */
277#endif
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278 /* keep this the last entry */
279 { US"NULL", ENV_MAIL_OPT_NULL, FALSE },
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280 };
281
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282/* When reading SMTP from a remote host, we have to use our own versions of the
283C input-reading functions, in order to be able to flush the SMTP output only
284when about to read more data from the socket. This is the only way to get
285optimal performance when the client is using pipelining. Flushing for every
286command causes a separate packet and reply packet each time; saving all the
287responses up (when pipelining) combines them into one packet and one response.
288
289For simplicity, these functions are used for *all* SMTP input, not only when
290receiving over a socket. However, after setting up a secure socket (SSL), input
291is read via the OpenSSL library, and another set of functions is used instead
292(see tls.c).
293
294These functions are set in the receive_getc etc. variables and called with the
295same interface as the C functions. However, since there can only ever be
296one incoming SMTP call, we just use a single buffer and flags. There is no need
297to implement a complicated private FILE-like structure.*/
298
299static uschar *smtp_inbuffer;
300static uschar *smtp_inptr;
301static uschar *smtp_inend;
302static int smtp_had_eof;
303static int smtp_had_error;
304
305
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306/* forward declarations */
307int bdat_ungetc(int ch);
bd8fbe36 308static int smtp_read_command(BOOL check_sync, unsigned buffer_lim);
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309static int synprot_error(int type, int code, uschar *data, uschar *errmess);
310static void smtp_quit_handler(uschar **, uschar **);
311static void smtp_rset_handler(void);
312
059ec3d9 313/*************************************************
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314* Recheck synchronization *
315*************************************************/
316
317/* Synchronization checks can never be perfect because a packet may be on its
318way but not arrived when the check is done. Such checks can in any case only be
319done when TLS is not in use. Normally, the checks happen when commands are
320read: Exim ensures that there is no more input in the input buffer. In normal
321cases, the response to the command will be fast, and there is no further check.
322
323However, for some commands an ACL is run, and that can include delays. In those
324cases, it is useful to do another check on the input just before sending the
325response. This also applies at the start of a connection. This function does
326that check by means of the select() function, as long as the facility is not
327disabled or inappropriate. A failure of select() is ignored.
328
329When there is unwanted input, we read it so that it appears in the log of the
330error.
331
332Arguments: none
333Returns: TRUE if all is well; FALSE if there is input pending
334*/
335
336static BOOL
337check_sync(void)
338{
339int fd, rc;
340fd_set fds;
341struct timeval tzero;
342
343if (!smtp_enforce_sync || sender_host_address == NULL ||
344 sender_host_notsocket || tls_in.active >= 0)
345 return TRUE;
346
347fd = fileno(smtp_in);
348FD_ZERO(&fds);
349FD_SET(fd, &fds);
350tzero.tv_sec = 0;
351tzero.tv_usec = 0;
352rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero);
353
354if (rc <= 0) return TRUE; /* Not ready to read */
bd8fbe36 355rc = smtp_getc(GETC_BUFFER_UNLIMITED);
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356if (rc < 0) return TRUE; /* End of file or error */
357
358smtp_ungetc(rc);
359rc = smtp_inend - smtp_inptr;
360if (rc > 150) rc = 150;
361smtp_inptr[rc] = 0;
362return FALSE;
363}
364
365
366
367/*************************************************
368* Log incomplete transactions *
369*************************************************/
370
371/* This function is called after a transaction has been aborted by RSET, QUIT,
372connection drops or other errors. It logs the envelope information received
373so far in order to preserve address verification attempts.
374
375Argument: string to indicate what aborted the transaction
376Returns: nothing
377*/
378
379static void
380incomplete_transaction_log(uschar *what)
381{
382if (sender_address == NULL || /* No transaction in progress */
383 !LOGGING(smtp_incomplete_transaction))
384 return;
385
386/* Build list of recipients for logging */
387
388if (recipients_count > 0)
389 {
390 int i;
391 raw_recipients = store_get(recipients_count * sizeof(uschar *));
392 for (i = 0; i < recipients_count; i++)
393 raw_recipients[i] = recipients_list[i].address;
394 raw_recipients_count = recipients_count;
395 }
396
397log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS,
398 "%s incomplete transaction (%s)", host_and_ident(TRUE), what);
399}
400
401
402
403
404/*************************************************
059ec3d9
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405* SMTP version of getc() *
406*************************************************/
407
408/* This gets the next byte from the SMTP input buffer. If the buffer is empty,
409it flushes the output, and refills the buffer, with a timeout. The signal
410handler is set appropriately by the calling function. This function is not used
4c04137d 411after a connection has negotiated itself into an TLS/SSL state.
059ec3d9 412
bd8fbe36 413Arguments: lim Maximum amount to read/buffer
059ec3d9
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414Returns: the next character or EOF
415*/
416
417int
bd8fbe36 418smtp_getc(unsigned lim)
059ec3d9
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419{
420if (smtp_inptr >= smtp_inend)
421 {
422 int rc, save_errno;
60d10ce7 423 if (!smtp_out) return EOF;
059ec3d9
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424 fflush(smtp_out);
425 if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
bd8fbe36
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426
427 /* Limit amount read, so non-message data is not fed to DKIM */
428
429 rc = read(fileno(smtp_in), smtp_inbuffer, MIN(IN_BUFFER_SIZE, lim));
059ec3d9
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430 save_errno = errno;
431 alarm(0);
432 if (rc <= 0)
433 {
434 /* Must put the error text in fixed store, because this might be during
435 header reading, where it releases unused store above the header. */
436 if (rc < 0)
437 {
438 smtp_had_error = save_errno;
439 smtp_read_error = string_copy_malloc(
440 string_sprintf(" (error: %s)", strerror(save_errno)));
441 }
442 else smtp_had_eof = 1;
443 return EOF;
444 }
80a47a2c
TK
445#ifndef DISABLE_DKIM
446 dkim_exim_verify_feed(smtp_inbuffer, rc);
447#endif
059ec3d9
PH
448 smtp_inend = smtp_inbuffer + rc;
449 smtp_inptr = smtp_inbuffer;
450 }
451return *smtp_inptr++;
452}
453
584e96c6
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454void
455smtp_get_cache(void)
456{
9960d1e5 457#ifndef DISABLE_DKIM
584e96c6
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458int n = smtp_inend - smtp_inptr;
459if (n > 0)
460 dkim_exim_verify_feed(smtp_inptr, n);
584e96c6 461#endif
9960d1e5 462}
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463
464
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465/* Get a byte from the smtp input, in CHUNKING mode. Handle ack of the
466previous BDAT chunk and getting new ones when we run out. Uses the
467underlying smtp_getc or tls_getc both for that and for getting the
468(buffered) data byte. EOD signals (an expected) no further data.
469ERR signals a protocol error, and EOF a closed input stream.
470
471Called from read_bdat_smtp() in receive.c for the message body, but also
472by the headers read loop in receive_msg(); manipulates chunking_state
473to handle the BDAT command/response.
474Placed here due to the correlation with the above smtp_getc(), which it wraps,
475and also by the need to do smtp command/response handling.
476
bd8fbe36 477Arguments: lim (ignored)
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478Returns: the next character or ERR, EOD or EOF
479*/
480
481int
bd8fbe36 482bdat_getc(unsigned lim)
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483{
484uschar * user_msg = NULL;
485uschar * log_msg;
486
487for(;;)
488 {
bd8fbe36
JH
489 if (chunking_data_left > 0)
490 return lwr_receive_getc(chunking_data_left--);
7e3ce68e
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491
492 receive_getc = lwr_receive_getc;
493 receive_ungetc = lwr_receive_ungetc;
bd8fbe36
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494#ifndef DISABLE_DKIM
495 dkim_collect_input = FALSE;
496#endif
7e3ce68e 497
f4630439
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498 /* Unless PIPELINING was offered, there should be no next command
499 until after we ack that chunk */
500
501 if (!pipelining_advertised && !check_sync())
502 {
503 incomplete_transaction_log(US"sync failure");
504 log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error "
505 "(next input sent too soon: pipelining was not advertised): "
506 "rejected \"%s\" %s next input=\"%s\"",
507 smtp_cmd_buffer, host_and_ident(TRUE),
508 string_printing(smtp_inptr));
509 (void) synprot_error(L_smtp_protocol_error, 554, NULL,
510 US"SMTP synchronization error");
511 goto repeat_until_rset;
512 }
513
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514 /* If not the last, ack the received chunk. The last response is delayed
515 until after the data ACL decides on it */
7e3ce68e
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516
517 if (chunking_state == CHUNKING_LAST)
584e96c6
JH
518 {
519#ifndef DISABLE_DKIM
e983e85a 520 dkim_exim_verify_feed(NULL, 0); /* notify EOD */
584e96c6 521#endif
7e3ce68e 522 return EOD;
584e96c6 523 }
7e3ce68e 524
7e3ce68e 525 smtp_printf("250 %u byte chunk received\r\n", chunking_datasize);
bd8fbe36
JH
526 chunking_state = CHUNKING_OFFERED;
527 DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
7e3ce68e
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528
529 /* Expect another BDAT cmd from input. RFC 3030 says nothing about
530 QUIT, RSET or NOOP but handling them seems obvious */
531
532next_cmd:
bd8fbe36 533 switch(smtp_read_command(TRUE, 1))
7e3ce68e
JH
534 {
535 default:
536 (void) synprot_error(L_smtp_protocol_error, 503, NULL,
537 US"only BDAT permissible after non-LAST BDAT");
538
539 repeat_until_rset:
bd8fbe36 540 switch(smtp_read_command(TRUE, 1))
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JH
541 {
542 case QUIT_CMD: smtp_quit_handler(&user_msg, &log_msg); /*FALLTHROUGH */
543 case EOF_CMD: return EOF;
544 case RSET_CMD: smtp_rset_handler(); return ERR;
545 default: if (synprot_error(L_smtp_protocol_error, 503, NULL,
546 US"only RSET accepted now") > 0)
547 return EOF;
548 goto repeat_until_rset;
549 }
550
551 case QUIT_CMD:
552 smtp_quit_handler(&user_msg, &log_msg);
553 /*FALLTHROUGH*/
554 case EOF_CMD:
555 return EOF;
556
557 case RSET_CMD:
558 smtp_rset_handler();
559 return ERR;
560
561 case NOOP_CMD:
562 HAD(SCH_NOOP);
563 smtp_printf("250 OK\r\n");
564 goto next_cmd;
565
566 case BDAT_CMD:
567 {
568 int n;
569
570 if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1)
571 {
572 (void) synprot_error(L_smtp_protocol_error, 501, NULL,
573 US"missing size for BDAT command");
574 return ERR;
575 }
576 chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0
577 ? CHUNKING_LAST : CHUNKING_ACTIVE;
578 chunking_data_left = chunking_datasize;
bd8fbe36
JH
579 DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n",
580 (int)chunking_state, chunking_data_left);
7e3ce68e
JH
581
582 if (chunking_datasize == 0)
583 if (chunking_state == CHUNKING_LAST)
584 return EOD;
585 else
586 {
587 (void) synprot_error(L_smtp_protocol_error, 504, NULL,
588 US"zero size for BDAT command");
589 goto repeat_until_rset;
590 }
591
592 receive_getc = bdat_getc;
593 receive_ungetc = bdat_ungetc;
bd8fbe36
JH
594#ifndef DISABLE_DKIM
595 dkim_collect_input = TRUE;
596#endif
7e3ce68e
JH
597 break; /* to top of main loop */
598 }
599 }
600 }
601}
602
1ebe15c3 603void
45bd315d
JH
604bdat_flush_data(void)
605{
bd8fbe36
JH
606while (chunking_data_left > 0)
607 if (lwr_receive_getc(chunking_data_left--) < 0)
45bd315d
JH
608 break;
609
610receive_getc = lwr_receive_getc;
611receive_ungetc = lwr_receive_ungetc;
612
613if (chunking_state != CHUNKING_LAST)
bd8fbe36 614 {
45bd315d 615 chunking_state = CHUNKING_OFFERED;
bd8fbe36
JH
616 DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
617 }
45bd315d
JH
618}
619
7e3ce68e
JH
620
621
622
059ec3d9
PH
623/*************************************************
624* SMTP version of ungetc() *
625*************************************************/
626
627/* Puts a character back in the input buffer. Only ever
628called once.
629
630Arguments:
631 ch the character
632
633Returns: the character
634*/
635
636int
637smtp_ungetc(int ch)
638{
7e3ce68e 639*--smtp_inptr = ch;
059ec3d9
PH
640return ch;
641}
642
643
7e3ce68e
JH
644int
645bdat_ungetc(int ch)
646{
647chunking_data_left++;
648return lwr_receive_ungetc(ch);
649}
650
059ec3d9
PH
651
652
653/*************************************************
654* SMTP version of feof() *
655*************************************************/
656
657/* Tests for a previous EOF
658
659Arguments: none
660Returns: non-zero if the eof flag is set
661*/
662
663int
664smtp_feof(void)
665{
666return smtp_had_eof;
667}
668
669
670
671
672/*************************************************
673* SMTP version of ferror() *
674*************************************************/
675
676/* Tests for a previous read error, and returns with errno
677restored to what it was when the error was detected.
678
679Arguments: none
680Returns: non-zero if the error flag is set
681*/
682
683int
684smtp_ferror(void)
685{
686errno = smtp_had_error;
687return smtp_had_error;
688}
689
690
691
58eb016e
PH
692/*************************************************
693* Test for characters in the SMTP buffer *
694*************************************************/
695
696/* Used at the end of a message
697
698Arguments: none
699Returns: TRUE/FALSE
700*/
701
702BOOL
703smtp_buffered(void)
704{
705return smtp_inptr < smtp_inend;
706}
707
708
059ec3d9
PH
709
710/*************************************************
711* Write formatted string to SMTP channel *
712*************************************************/
713
714/* This is a separate function so that we don't have to repeat everything for
715TLS support or debugging. It is global so that the daemon and the
716authentication functions can use it. It does not return any error indication,
717because major problems such as dropped connections won't show up till an output
718flush for non-TLS connections. The smtp_fflush() function is available for
719checking that: for convenience, TLS output errors are remembered here so that
720they are also picked up later by smtp_fflush().
721
722Arguments:
723 format format string
724 ... optional arguments
725
726Returns: nothing
727*/
728
729void
1ba28e2b 730smtp_printf(const char *format, ...)
059ec3d9
PH
731{
732va_list ap;
733
ce552449
NM
734va_start(ap, format);
735smtp_vprintf(format, ap);
736va_end(ap);
737}
738
739/* This is split off so that verify.c:respond_printf() can, in effect, call
740smtp_printf(), bearing in mind that in C a vararg function can't directly
fb08281f 741call another vararg function, only a function which accepts a va_list. */
ce552449
NM
742
743void
1ba28e2b 744smtp_vprintf(const char *format, va_list ap)
ce552449 745{
fb08281f
DW
746BOOL yield;
747
748yield = string_vformat(big_buffer, big_buffer_size, format, ap);
ce552449 749
059ec3d9
PH
750DEBUG(D_receive)
751 {
fb08281f
DW
752 void *reset_point = store_get(0);
753 uschar *msg_copy, *cr, *end;
754 msg_copy = string_copy(big_buffer);
755 end = msg_copy + Ustrlen(msg_copy);
756 while ((cr = Ustrchr(msg_copy, '\r')) != NULL) /* lose CRs */
757 memmove(cr, cr + 1, (end--) - cr);
758 debug_printf("SMTP>> %s", msg_copy);
759 store_reset(reset_point);
059ec3d9
PH
760 }
761
fb08281f 762if (!yield)
2679d413
PH
763 {
764 log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf()");
765 smtp_closedown(US"Unexpected error");
766 exim_exit(EXIT_FAILURE);
767 }
2679d413
PH
768
769/* If this is the first output for a (non-batch) RCPT command, see if all RCPTs
770have had the same. Note: this code is also present in smtp_respond(). It would
771be tidier to have it only in one place, but when it was added, it was easier to
772do it that way, so as not to have to mess with the code for the RCPT command,
773which sometimes uses smtp_printf() and sometimes smtp_respond(). */
774
775if (rcpt_in_progress)
776 {
777 if (rcpt_smtp_response == NULL)
778 rcpt_smtp_response = string_copy(big_buffer);
779 else if (rcpt_smtp_response_same &&
780 Ustrcmp(rcpt_smtp_response, big_buffer) != 0)
781 rcpt_smtp_response_same = FALSE;
782 rcpt_in_progress = FALSE;
783 }
059ec3d9 784
2679d413 785/* Now write the string */
059ec3d9
PH
786
787#ifdef SUPPORT_TLS
817d9f57 788if (tls_in.active >= 0)
059ec3d9 789 {
817d9f57
JH
790 if (tls_write(TRUE, big_buffer, Ustrlen(big_buffer)) < 0)
791 smtp_write_error = -1;
059ec3d9
PH
792 }
793else
794#endif
795
2679d413 796if (fprintf(smtp_out, "%s", big_buffer) < 0) smtp_write_error = -1;
059ec3d9
PH
797}
798
799
800
801/*************************************************
802* Flush SMTP out and check for error *
803*************************************************/
804
805/* This function isn't currently used within Exim (it detects errors when it
806tries to read the next SMTP input), but is available for use in local_scan().
807For non-TLS connections, it flushes the output and checks for errors. For
808TLS-connections, it checks for a previously-detected TLS write error.
809
810Arguments: none
811Returns: 0 for no error; -1 after an error
812*/
813
814int
815smtp_fflush(void)
816{
817d9f57 817if (tls_in.active < 0 && fflush(smtp_out) != 0) smtp_write_error = -1;
059ec3d9
PH
818return smtp_write_error;
819}
820
821
822
823/*************************************************
824* SMTP command read timeout *
825*************************************************/
826
827/* Signal handler for timing out incoming SMTP commands. This attempts to
828finish off tidily.
829
830Argument: signal number (SIGALRM)
831Returns: nothing
832*/
833
834static void
835command_timeout_handler(int sig)
836{
837sig = sig; /* Keep picky compilers happy */
838log_write(L_lost_incoming_connection,
839 LOG_MAIN, "SMTP command timeout on%s connection from %s",
817d9f57 840 (tls_in.active >= 0)? " TLS" : "",
059ec3d9
PH
841 host_and_ident(FALSE));
842if (smtp_batched_input)
843 moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */
8f128379
PH
844smtp_notquit_exit(US"command-timeout", US"421",
845 US"%s: SMTP command timeout - closing connection", smtp_active_hostname);
059ec3d9
PH
846exim_exit(EXIT_FAILURE);
847}
848
849
850
851/*************************************************
852* SIGTERM received *
853*************************************************/
854
855/* Signal handler for handling SIGTERM. Again, try to finish tidily.
856
857Argument: signal number (SIGTERM)
858Returns: nothing
859*/
860
861static void
862command_sigterm_handler(int sig)
863{
864sig = sig; /* Keep picky compilers happy */
865log_write(0, LOG_MAIN, "%s closed after SIGTERM", smtp_get_connection_info());
866if (smtp_batched_input)
867 moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */
8f128379
PH
868smtp_notquit_exit(US"signal-exit", US"421",
869 US"%s: Service not available - closing connection", smtp_active_hostname);
059ec3d9
PH
870exim_exit(EXIT_FAILURE);
871}
872
873
874
a14e5636 875
cee5f132 876#ifdef SUPPORT_PROXY
a3c86431 877/*************************************************
a3bddaa8
TL
878* Restore socket timeout to previous value *
879*************************************************/
880/* If the previous value was successfully retrieved, restore
881it before returning control to the non-proxy routines
882
883Arguments: fd - File descriptor for input
884 get_ok - Successfully retrieved previous values
885 tvtmp - Time struct with previous values
886 vslen - Length of time struct
887Returns: none
888*/
889static void
f267271d 890restore_socket_timeout(int fd, int get_ok, struct timeval * tvtmp, socklen_t vslen)
a3bddaa8
TL
891{
892if (get_ok == 0)
f267271d 893 (void) setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS tvtmp, vslen);
a3bddaa8
TL
894}
895
896/*************************************************
a3c86431
TL
897* Check if host is required proxy host *
898*************************************************/
899/* The function determines if inbound host will be a regular smtp host
1811cb4c
JH
900or if it is configured that it must use Proxy Protocol. A local
901connection cannot.
a3c86431
TL
902
903Arguments: none
904Returns: bool
905*/
906
907static BOOL
908check_proxy_protocol_host()
909{
910int rc;
a3c86431 911
1811cb4c
JH
912if ( sender_host_address
913 && (rc = verify_check_this_host(CUSS &hosts_proxy, NULL, NULL,
914 sender_host_address, NULL)) == OK)
a3c86431
TL
915 {
916 DEBUG(D_receive)
917 debug_printf("Detected proxy protocol configured host\n");
918 proxy_session = TRUE;
919 }
920return proxy_session;
921}
922
923
924/*************************************************
3f251b3c
PP
925* Read data until newline or end of buffer *
926*************************************************/
927/* While SMTP is server-speaks-first, TLS is client-speaks-first, so we can't
928read an entire buffer and assume there will be nothing past a proxy protocol
929header. Our approach normally is to use stdio, but again that relies upon
930"STARTTLS\r\n" and a server response before the client starts TLS handshake, or
931reading _nothing_ before client TLS handshake. So we don't want to use the
932usual buffering reads which may read enough to block TLS starting.
933
934So unfortunately we're down to "read one byte at a time, with a syscall each,
935and expect a little overhead", for all proxy-opened connections which are v1,
936just to handle the TLS-on-connect case. Since SSL functions wrap the
937underlying fd, we can't assume that we can feed them any already-read content.
938
939We need to know where to read to, the max capacity, and we'll read until we
940get a CR and one more character. Let the caller scream if it's CR+!LF.
941
942Return the amount read.
943*/
944
945static int
946swallow_until_crlf(int fd, void *vto, int capacity)
947{
948 uschar *to = (uschar *)vto;
949 int have = 0;
950 int ret;
951 int last = 0;
952
953 while (capacity > 0) {
954 do { ret = recv(fd, to, 1, 0); } while (ret == -1 && errno == EINTR);
955 if (ret == -1)
956 return -1;
957 have++;
958 if (last)
959 return have;
960 if (*to == '\r')
961 last = 1;
962 capacity--;
963 to++;
964 }
965 // reached end without having room for a final newline, abort
966 errno = EOVERFLOW;
967 return -1;
968}
969
970/*************************************************
a3c86431
TL
971* Setup host for proxy protocol *
972*************************************************/
973/* The function configures the connection based on a header from the
974inbound host to use Proxy Protocol. The specification is very exact
975so exit with an error if do not find the exact required pieces. This
976includes an incorrect number of spaces separating args.
977
978Arguments: none
f267271d 979Returns: Boolean success
a3c86431
TL
980*/
981
1811cb4c 982static void
a3c86431
TL
983setup_proxy_protocol_host()
984{
985union {
986 struct {
987 uschar line[108];
988 } v1;
989 struct {
990 uschar sig[12];
36719342
TL
991 uint8_t ver_cmd;
992 uint8_t fam;
993 uint16_t len;
a3c86431
TL
994 union {
995 struct { /* TCP/UDP over IPv4, len = 12 */
996 uint32_t src_addr;
997 uint32_t dst_addr;
998 uint16_t src_port;
999 uint16_t dst_port;
1000 } ip4;
1001 struct { /* TCP/UDP over IPv6, len = 36 */
1002 uint8_t src_addr[16];
1003 uint8_t dst_addr[16];
1004 uint16_t src_port;
1005 uint16_t dst_port;
1006 } ip6;
1007 struct { /* AF_UNIX sockets, len = 216 */
1008 uschar src_addr[108];
1009 uschar dst_addr[108];
1010 } unx;
1011 } addr;
1012 } v2;
1013} hdr;
1014
eb57651e
TL
1015/* Temp variables used in PPv2 address:port parsing */
1016uint16_t tmpport;
1017char tmpip[INET_ADDRSTRLEN];
1018struct sockaddr_in tmpaddr;
1019char tmpip6[INET6_ADDRSTRLEN];
1020struct sockaddr_in6 tmpaddr6;
1021
1022int get_ok = 0;
f267271d
JH
1023int size, ret;
1024int fd = fileno(smtp_in);
3f251b3c 1025#define PROXY_INITIAL_READ 12
36719342 1026const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";
9e7e0f6a 1027uschar * iptype; /* To display debug info */
a3c86431 1028struct timeval tv;
a3bddaa8 1029struct timeval tvtmp;
f267271d 1030socklen_t vslen = sizeof(struct timeval);
1811cb4c 1031BOOL yield = FALSE;
a3c86431 1032
a3bddaa8 1033/* Save current socket timeout values */
f267271d 1034get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tvtmp, &vslen);
a3bddaa8 1035
a3c86431
TL
1036/* Proxy Protocol host must send header within a short time
1037(default 3 seconds) or it's considered invalid */
1038tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC;
1039tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC;
f267271d 1040if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tv, sizeof(tv)) < 0)
1811cb4c 1041 goto bad;
a3bddaa8 1042
a3c86431
TL
1043do
1044 {
eb57651e
TL
1045 /* The inbound host was declared to be a Proxy Protocol host, so
1046 don't do a PEEK into the data, actually slurp it up. */
3f251b3c
PP
1047 /* We assume that the zie of a v2sig is less than the size of a complete
1048 PROXYv1 line, so that we will _have_ to read more data; "PROXY TCPn\r\n"
1049 is 12, so an IP address pushes it over, so we're good. */
1050 ret = recv(fd, &hdr, PROXY_INITIAL_READ, 0);
a3c86431
TL
1051 }
1052 while (ret == -1 && errno == EINTR);
1053
1054if (ret == -1)
f267271d 1055 goto proxyfail;
a3c86431 1056
5d036699 1057if (ret >= 16 && memcmp(&hdr.v2, v2sig, 12) == 0)
a3c86431 1058 {
3f251b3c
PP
1059 uint8_t ver, cmd;
1060 int ret2nd;
1061
1062 /* It's now safe to read the rest. */
1063 do {
1064 ret2nd = recv(fd, (uschar*)&hdr + ret, sizeof(hdr)-ret, 0);
1065 } while (ret2nd == -1 && errno == EINTR);
1066 if (ret2nd == -1)
1067 goto proxyfail;
1068 ret += ret2nd;
1069
1070 ver = (hdr.v2.ver_cmd & 0xf0) >> 4;
1071 cmd = (hdr.v2.ver_cmd & 0x0f);
36719342
TL
1072
1073 /* May 2014: haproxy combined the version and command into one byte to
1074 allow two full bytes for the length field in order to proxy SSL
1075 connections. SSL Proxy is not supported in this version of Exim, but
4c04137d 1076 must still separate values here. */
36719342
TL
1077
1078 if (ver != 0x02)
1079 {
1080 DEBUG(D_receive) debug_printf("Invalid Proxy Protocol version: %d\n", ver);
1081 goto proxyfail;
1082 }
a3c86431 1083 DEBUG(D_receive) debug_printf("Detected PROXYv2 header\n");
36719342 1084 /* The v2 header will always be 16 bytes per the spec. */
5d036699 1085 size = 16 + ntohs(hdr.v2.len);
a3c86431
TL
1086 if (ret < size)
1087 {
36719342
TL
1088 DEBUG(D_receive) debug_printf("Truncated or too large PROXYv2 header (%d/%d)\n",
1089 ret, size);
a3c86431
TL
1090 goto proxyfail;
1091 }
36719342 1092 switch (cmd)
a3c86431
TL
1093 {
1094 case 0x01: /* PROXY command */
1095 switch (hdr.v2.fam)
1096 {
eb57651e
TL
1097 case 0x11: /* TCPv4 address type */
1098 iptype = US"IPv4";
1099 tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr;
5d036699
JH
1100 inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
1101 if (!string_is_ip_address(US tmpip, NULL))
eb57651e
TL
1102 {
1103 DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
f267271d 1104 goto proxyfail;
eb57651e 1105 }
e6d2a989 1106 proxy_local_address = sender_host_address;
eb57651e
TL
1107 sender_host_address = string_copy(US tmpip);
1108 tmpport = ntohs(hdr.v2.addr.ip4.src_port);
e6d2a989 1109 proxy_local_port = sender_host_port;
eb57651e
TL
1110 sender_host_port = tmpport;
1111 /* Save dest ip/port */
1112 tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr;
5d036699
JH
1113 inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
1114 if (!string_is_ip_address(US tmpip, NULL))
eb57651e
TL
1115 {
1116 DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
f267271d 1117 goto proxyfail;
eb57651e 1118 }
7a2fa0bc 1119 proxy_external_address = string_copy(US tmpip);
eb57651e 1120 tmpport = ntohs(hdr.v2.addr.ip4.dst_port);
7a2fa0bc 1121 proxy_external_port = tmpport;
a3c86431 1122 goto done;
eb57651e
TL
1123 case 0x21: /* TCPv6 address type */
1124 iptype = US"IPv6";
1125 memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16);
5d036699
JH
1126 inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
1127 if (!string_is_ip_address(US tmpip6, NULL))
eb57651e
TL
1128 {
1129 DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
f267271d 1130 goto proxyfail;
eb57651e 1131 }
e6d2a989 1132 proxy_local_address = sender_host_address;
eb57651e
TL
1133 sender_host_address = string_copy(US tmpip6);
1134 tmpport = ntohs(hdr.v2.addr.ip6.src_port);
e6d2a989 1135 proxy_local_port = sender_host_port;
eb57651e
TL
1136 sender_host_port = tmpport;
1137 /* Save dest ip/port */
1138 memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16);
5d036699
JH
1139 inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
1140 if (!string_is_ip_address(US tmpip6, NULL))
eb57651e
TL
1141 {
1142 DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
f267271d 1143 goto proxyfail;
eb57651e 1144 }
7a2fa0bc 1145 proxy_external_address = string_copy(US tmpip6);
eb57651e 1146 tmpport = ntohs(hdr.v2.addr.ip6.dst_port);
7a2fa0bc 1147 proxy_external_port = tmpport;
a3c86431 1148 goto done;
eb57651e
TL
1149 default:
1150 DEBUG(D_receive)
1151 debug_printf("Unsupported PROXYv2 connection type: 0x%02x\n",
1152 hdr.v2.fam);
1153 goto proxyfail;
a3c86431
TL
1154 }
1155 /* Unsupported protocol, keep local connection address */
1156 break;
1157 case 0x00: /* LOCAL command */
1158 /* Keep local connection address for LOCAL */
9e7e0f6a 1159 iptype = US"local";
a3c86431
TL
1160 break;
1161 default:
eb57651e 1162 DEBUG(D_receive)
36719342 1163 debug_printf("Unsupported PROXYv2 command: 0x%x\n", cmd);
a3c86431
TL
1164 goto proxyfail;
1165 }
1166 }
5d036699 1167else if (ret >= 8 && memcmp(hdr.v1.line, "PROXY", 5) == 0)
a3c86431 1168 {
3f251b3c
PP
1169 uschar *p;
1170 uschar *end;
a3c86431
TL
1171 uschar *sp; /* Utility variables follow */
1172 int tmp_port;
3f251b3c 1173 int r2;
a3c86431
TL
1174 char *endc;
1175
3f251b3c
PP
1176 /* get the rest of the line */
1177 r2 = swallow_until_crlf(fd, (uschar*)&hdr + ret, sizeof(hdr)-ret);
1178 if (r2 == -1)
1179 goto proxyfail;
1180 ret += r2;
1181
1182 p = string_copy(hdr.v1.line);
1183 end = memchr(p, '\r', ret - 1);
1184
a3c86431
TL
1185 if (!end || end[1] != '\n')
1186 {
1187 DEBUG(D_receive) debug_printf("Partial or invalid PROXY header\n");
1188 goto proxyfail;
1189 }
1190 *end = '\0'; /* Terminate the string */
a5d4db40 1191 size = end + 2 - p; /* Skip header + CRLF */
a3c86431 1192 DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n");
3f251b3c 1193 DEBUG(D_receive) debug_printf("Bytes read not within PROXY header: %d\n", ret - size);
a3c86431 1194 /* Step through the string looking for the required fields. Ensure
4c04137d 1195 strict adherence to required formatting, exit for any error. */
a3c86431
TL
1196 p += 5;
1197 if (!isspace(*(p++)))
1198 {
1199 DEBUG(D_receive) debug_printf("Missing space after PROXY command\n");
1200 goto proxyfail;
1201 }
1202 if (!Ustrncmp(p, CCS"TCP4", 4))
1203 iptype = US"IPv4";
1204 else if (!Ustrncmp(p,CCS"TCP6", 4))
1205 iptype = US"IPv6";
1206 else if (!Ustrncmp(p,CCS"UNKNOWN", 7))
1207 {
1208 iptype = US"Unknown";
1209 goto done;
1210 }
1211 else
1212 {
1213 DEBUG(D_receive) debug_printf("Invalid TCP type\n");
1214 goto proxyfail;
1215 }
1216
1217 p += Ustrlen(iptype);
1218 if (!isspace(*(p++)))
1219 {
1220 DEBUG(D_receive) debug_printf("Missing space after TCP4/6 command\n");
1221 goto proxyfail;
1222 }
1223 /* Find the end of the arg */
1224 if ((sp = Ustrchr(p, ' ')) == NULL)
1225 {
1226 DEBUG(D_receive)
1227 debug_printf("Did not find proxied src %s\n", iptype);
1228 goto proxyfail;
1229 }
1230 *sp = '\0';
5d036699 1231 if(!string_is_ip_address(p, NULL))
a3c86431
TL
1232 {
1233 DEBUG(D_receive)
1234 debug_printf("Proxied src arg is not an %s address\n", iptype);
1235 goto proxyfail;
1236 }
e6d2a989 1237 proxy_local_address = sender_host_address;
a3c86431
TL
1238 sender_host_address = p;
1239 p = sp + 1;
1240 if ((sp = Ustrchr(p, ' ')) == NULL)
1241 {
1242 DEBUG(D_receive)
1243 debug_printf("Did not find proxy dest %s\n", iptype);
1244 goto proxyfail;
1245 }
1246 *sp = '\0';
5d036699 1247 if(!string_is_ip_address(p, NULL))
a3c86431
TL
1248 {
1249 DEBUG(D_receive)
1250 debug_printf("Proxy dest arg is not an %s address\n", iptype);
1251 goto proxyfail;
1252 }
7a2fa0bc 1253 proxy_external_address = p;
a3c86431
TL
1254 p = sp + 1;
1255 if ((sp = Ustrchr(p, ' ')) == NULL)
1256 {
1257 DEBUG(D_receive) debug_printf("Did not find proxied src port\n");
1258 goto proxyfail;
1259 }
1260 *sp = '\0';
5d036699 1261 tmp_port = strtol(CCS p, &endc, 10);
a3c86431
TL
1262 if (*endc || tmp_port == 0)
1263 {
1264 DEBUG(D_receive)
1265 debug_printf("Proxied src port '%s' not an integer\n", p);
1266 goto proxyfail;
1267 }
e6d2a989 1268 proxy_local_port = sender_host_port;
a3c86431
TL
1269 sender_host_port = tmp_port;
1270 p = sp + 1;
1271 if ((sp = Ustrchr(p, '\0')) == NULL)
1272 {
1273 DEBUG(D_receive) debug_printf("Did not find proxy dest port\n");
1274 goto proxyfail;
1275 }
5d036699 1276 tmp_port = strtol(CCS p, &endc, 10);
a3c86431
TL
1277 if (*endc || tmp_port == 0)
1278 {
1279 DEBUG(D_receive)
1280 debug_printf("Proxy dest port '%s' not an integer\n", p);
1281 goto proxyfail;
1282 }
7a2fa0bc 1283 proxy_external_port = tmp_port;
a3c86431 1284 /* Already checked for /r /n above. Good V1 header received. */
a3c86431
TL
1285 }
1286else
1287 {
1288 /* Wrong protocol */
eb57651e 1289 DEBUG(D_receive) debug_printf("Invalid proxy protocol version negotiation\n");
3f251b3c 1290 (void) swallow_until_crlf(fd, (uschar*)&hdr + ret, sizeof(hdr)-ret);
a3c86431
TL
1291 goto proxyfail;
1292 }
1293
1811cb4c
JH
1294done:
1295 DEBUG(D_receive)
1296 debug_printf("Valid %s sender from Proxy Protocol header\n", iptype);
1297 yield = proxy_session;
1298
1299/* Don't flush any potential buffer contents. Any input on proxyfail
1300should cause a synchronization failure */
1301
a3c86431 1302proxyfail:
1811cb4c 1303 restore_socket_timeout(fd, get_ok, &tvtmp, vslen);
a3c86431 1304
1811cb4c
JH
1305bad:
1306 if (yield)
1307 {
1308 sender_host_name = NULL;
1309 (void) host_name_lookup();
1310 host_build_sender_fullhost();
1311 }
1312 else
1313 {
1314 proxy_session_failed = TRUE;
1315 DEBUG(D_receive)
1316 debug_printf("Failure to extract proxied host, only QUIT allowed\n");
1317 }
1318
1319return;
a3c86431
TL
1320}
1321#endif
1322
059ec3d9
PH
1323/*************************************************
1324* Read one command line *
1325*************************************************/
1326
1327/* Strictly, SMTP commands coming over the net are supposed to end with CRLF.
1328There are sites that don't do this, and in any case internal SMTP probably
1329should check only for LF. Consequently, we check here for LF only. The line
1330ends up with [CR]LF removed from its end. If we get an overlong line, treat as
3ee512ff
PH
1331an unknown command. The command is read into the global smtp_cmd_buffer so that
1332it is available via $smtp_command.
059ec3d9
PH
1333
1334The character reading routine sets up a timeout for each block actually read
1335from the input (which may contain more than one command). We set up a special
1336signal handler that closes down the session on a timeout. Control does not
1337return when it runs.
1338
1339Arguments:
bd8fbe36
JH
1340 check_sync if TRUE, check synchronization rules if global option is TRUE
1341 buffer_lim maximum to buffer in lower layer
059ec3d9
PH
1342
1343Returns: a code identifying the command (enumerated above)
1344*/
1345
1346static int
bd8fbe36 1347smtp_read_command(BOOL check_sync, unsigned buffer_lim)
059ec3d9
PH
1348{
1349int c;
1350int ptr = 0;
1351smtp_cmd_list *p;
1352BOOL hadnull = FALSE;
1353
1354os_non_restarting_signal(SIGALRM, command_timeout_handler);
1355
bd8fbe36 1356while ((c = (receive_getc)(buffer_lim)) != '\n' && c != EOF)
059ec3d9 1357 {
bd8fbe36 1358 if (ptr >= SMTP_CMD_BUFFER_SIZE)
059ec3d9
PH
1359 {
1360 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1361 return OTHER_CMD;
1362 }
1363 if (c == 0)
1364 {
1365 hadnull = TRUE;
1366 c = '?';
1367 }
3ee512ff 1368 smtp_cmd_buffer[ptr++] = c;
059ec3d9
PH
1369 }
1370
1371receive_linecount++; /* For BSMTP errors */
1372os_non_restarting_signal(SIGALRM, sigalrm_handler);
1373
1374/* If hit end of file, return pseudo EOF command. Whether we have a
1375part-line already read doesn't matter, since this is an error state. */
1376
1377if (c == EOF) return EOF_CMD;
1378
1379/* Remove any CR and white space at the end of the line, and terminate the
1380string. */
1381
3ee512ff
PH
1382while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--;
1383smtp_cmd_buffer[ptr] = 0;
059ec3d9 1384
3ee512ff 1385DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer);
059ec3d9
PH
1386
1387/* NULLs are not allowed in SMTP commands */
1388
1389if (hadnull) return BADCHAR_CMD;
1390
1391/* Scan command list and return identity, having set the data pointer
1392to the start of the actual data characters. Check for SMTP synchronization
1393if required. */
1394
1395for (p = cmd_list; p < cmd_list_end; p++)
1396 {
1811cb4c 1397#ifdef SUPPORT_PROXY
a3c86431 1398 /* Only allow QUIT command if Proxy Protocol parsing failed */
1811cb4c
JH
1399 if (proxy_session && proxy_session_failed && p->cmd != QUIT_CMD)
1400 continue;
1401#endif
2f460950
JH
1402 if ( p->len
1403 && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0
1404 && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */
1405 || smtp_cmd_buffer[p->len] == 0
1406 || smtp_cmd_buffer[p->len] == ' '
1407 ) )
059ec3d9
PH
1408 {
1409 if (smtp_inptr < smtp_inend && /* Outstanding input */
1410 p->cmd < sync_cmd_limit && /* Command should sync */
1411 check_sync && /* Local flag set */
1412 smtp_enforce_sync && /* Global flag set */
1413 sender_host_address != NULL && /* Not local input */
1414 !sender_host_notsocket) /* Really is a socket */
1415 return BADSYN_CMD;
1416
ca86f471
PH
1417 /* The variables $smtp_command and $smtp_command_argument point into the
1418 unmodified input buffer. A copy of the latter is taken for actual
1419 processing, so that it can be chopped up into separate parts if necessary,
1420 for example, when processing a MAIL command options such as SIZE that can
1421 follow the sender address. */
059ec3d9 1422
3ee512ff 1423 smtp_cmd_argument = smtp_cmd_buffer + p->len;
ca86f471
PH
1424 while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++;
1425 Ustrcpy(smtp_data_buffer, smtp_cmd_argument);
1426 smtp_cmd_data = smtp_data_buffer;
059ec3d9
PH
1427
1428 /* Count non-mail commands from those hosts that are controlled in this
1429 way. The default is all hosts. We don't waste effort checking the list
1430 until we get a non-mail command, but then cache the result to save checking
1431 again. If there's a DEFER while checking the host, assume it's in the list.
1432
1433 Note that one instance of RSET, EHLO/HELO, and STARTTLS is allowed at the
1434 start of each incoming message by fiddling with the value in the table. */
1435
1436 if (!p->is_mail_cmd)
1437 {
1438 if (count_nonmail == TRUE_UNSET) count_nonmail =
1439 verify_check_host(&smtp_accept_max_nonmail_hosts) != FAIL;
1440 if (count_nonmail && ++nonmail_command_count > smtp_accept_max_nonmail)
1441 return TOO_MANY_NONMAIL_CMD;
1442 }
1443
ca86f471
PH
1444 /* If there is data for a command that does not expect it, generate the
1445 error here. */
059ec3d9 1446
ca86f471 1447 return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD;
059ec3d9
PH
1448 }
1449 }
1450
cee5f132 1451#ifdef SUPPORT_PROXY
a3c86431
TL
1452/* Only allow QUIT command if Proxy Protocol parsing failed */
1453if (proxy_session && proxy_session_failed)
1454 return PROXY_FAIL_IGNORE_CMD;
1455#endif
1456
059ec3d9
PH
1457/* Enforce synchronization for unknown commands */
1458
1459if (smtp_inptr < smtp_inend && /* Outstanding input */
1460 check_sync && /* Local flag set */
1461 smtp_enforce_sync && /* Global flag set */
1462 sender_host_address != NULL && /* Not local input */
1463 !sender_host_notsocket) /* Really is a socket */
1464 return BADSYN_CMD;
1465
1466return OTHER_CMD;
1467}
1468
1469
1470
1471/*************************************************
1472* Forced closedown of call *
1473*************************************************/
1474
1475/* This function is called from log.c when Exim is dying because of a serious
1476disaster, and also from some other places. If an incoming non-batched SMTP
1477channel is open, it swallows the rest of the incoming message if in the DATA
1478phase, sends the reply string, and gives an error to all subsequent commands
1479except QUIT. The existence of an SMTP call is detected by the non-NULLness of
1480smtp_in.
1481
8f128379
PH
1482Arguments:
1483 message SMTP reply string to send, excluding the code
1484
059ec3d9
PH
1485Returns: nothing
1486*/
1487
1488void
1489smtp_closedown(uschar *message)
1490{
1491if (smtp_in == NULL || smtp_batched_input) return;
1492receive_swallow_smtp();
1493smtp_printf("421 %s\r\n", message);
1494
bd8fbe36 1495for (;;) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
059ec3d9 1496 {
60d10ce7
JH
1497 case EOF_CMD:
1498 return;
059ec3d9 1499
60d10ce7
JH
1500 case QUIT_CMD:
1501 smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
1502 mac_smtp_fflush();
1503 return;
059ec3d9 1504
60d10ce7
JH
1505 case RSET_CMD:
1506 smtp_printf("250 Reset OK\r\n");
1507 break;
059ec3d9 1508
60d10ce7
JH
1509 default:
1510 smtp_printf("421 %s\r\n", message);
1511 break;
059ec3d9
PH
1512 }
1513}
1514
1515
1516
1517
1518/*************************************************
1519* Set up connection info for logging *
1520*************************************************/
1521
1522/* This function is called when logging information about an SMTP connection.
1523It sets up appropriate source information, depending on the type of connection.
dac79d3e
PH
1524If sender_fullhost is NULL, we are at a very early stage of the connection;
1525just use the IP address.
059ec3d9
PH
1526
1527Argument: none
1528Returns: a string describing the connection
1529*/
1530
1531uschar *
1532smtp_get_connection_info(void)
1533{
f5d25c2b
JH
1534const uschar * hostname = sender_fullhost
1535 ? sender_fullhost : sender_host_address;
dac79d3e 1536
059ec3d9 1537if (host_checking)
dac79d3e 1538 return string_sprintf("SMTP connection from %s", hostname);
059ec3d9
PH
1539
1540if (sender_host_unknown || sender_host_notsocket)
1541 return string_sprintf("SMTP connection from %s", sender_ident);
1542
1543if (is_inetd)
dac79d3e 1544 return string_sprintf("SMTP connection from %s (via inetd)", hostname);
059ec3d9 1545
6c6d6e48 1546if (LOGGING(incoming_interface) && interface_address != NULL)
dac79d3e 1547 return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname,
059ec3d9
PH
1548 interface_address, interface_port);
1549
dac79d3e 1550return string_sprintf("SMTP connection from %s", hostname);
059ec3d9
PH
1551}
1552
1553
1554
e45a1c37 1555#ifdef SUPPORT_TLS
887291d2
JH
1556/* Append TLS-related information to a log line
1557
1558Arguments:
1559 s String under construction: allocated string to extend, or NULL
1560 sizep Pointer to current allocation size (update on return), or NULL
1561 ptrp Pointer to index for new entries in string (update on return), or NULL
1562
1563Returns: Allocated string or NULL
1564*/
e45a1c37
JH
1565static uschar *
1566s_tlslog(uschar * s, int * sizep, int * ptrp)
1567{
1568 int size = sizep ? *sizep : 0;
1569 int ptr = ptrp ? *ptrp : 0;
1570
6c6d6e48 1571 if (LOGGING(tls_cipher) && tls_in.cipher != NULL)
e45a1c37 1572 s = string_append(s, &size, &ptr, 2, US" X=", tls_in.cipher);
6c6d6e48 1573 if (LOGGING(tls_certificate_verified) && tls_in.cipher != NULL)
e45a1c37
JH
1574 s = string_append(s, &size, &ptr, 2, US" CV=",
1575 tls_in.certificate_verified? "yes":"no");
6c6d6e48 1576 if (LOGGING(tls_peerdn) && tls_in.peerdn != NULL)
e45a1c37
JH
1577 s = string_append(s, &size, &ptr, 3, US" DN=\"",
1578 string_printing(tls_in.peerdn), US"\"");
6c6d6e48 1579 if (LOGGING(tls_sni) && tls_in.sni != NULL)
e45a1c37
JH
1580 s = string_append(s, &size, &ptr, 3, US" SNI=\"",
1581 string_printing(tls_in.sni), US"\"");
1582
67d81c10
JH
1583 if (s)
1584 {
1585 s[ptr] = '\0';
1586 if (sizep) *sizep = size;
1587 if (ptrp) *ptrp = ptr;
1588 }
e45a1c37
JH
1589 return s;
1590}
1591#endif
1592
059ec3d9 1593/*************************************************
b4ed4da0
PH
1594* Log lack of MAIL if so configured *
1595*************************************************/
1596
1597/* This function is called when an SMTP session ends. If the log selector
1598smtp_no_mail is set, write a log line giving some details of what has happened
1599in the SMTP session.
1600
1601Arguments: none
1602Returns: nothing
1603*/
1604
1605void
1606smtp_log_no_mail(void)
1607{
1608int size, ptr, i;
1609uschar *s, *sep;
1610
6c6d6e48 1611if (smtp_mailcmd_count > 0 || !LOGGING(smtp_no_mail))
b4ed4da0
PH
1612 return;
1613
1614s = NULL;
1615size = ptr = 0;
1616
1617if (sender_host_authenticated != NULL)
1618 {
1619 s = string_append(s, &size, &ptr, 2, US" A=", sender_host_authenticated);
1620 if (authenticated_id != NULL)
1621 s = string_append(s, &size, &ptr, 2, US":", authenticated_id);
1622 }
1623
1624#ifdef SUPPORT_TLS
e45a1c37 1625s = s_tlslog(s, &size, &ptr);
3f0945ff 1626#endif
b4ed4da0
PH
1627
1628sep = (smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE)?
1629 US" C=..." : US" C=";
1630for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++)
1631 {
1632 if (smtp_connection_had[i] != SCH_NONE)
1633 {
1634 s = string_append(s, &size, &ptr, 2, sep,
1635 smtp_names[smtp_connection_had[i]]);
1636 sep = US",";
1637 }
1638 }
1639
1640for (i = 0; i < smtp_ch_index; i++)
1641 {
1642 s = string_append(s, &size, &ptr, 2, sep, smtp_names[smtp_connection_had[i]]);
1643 sep = US",";
1644 }
1645
1646if (s != NULL) s[ptr] = 0; else s = US"";
1647log_write(0, LOG_MAIN, "no MAIL in SMTP connection from %s D=%s%s",
1648 host_and_ident(FALSE),
19050083
JH
1649 readconf_printtime( (int) ((long)time(NULL) - (long)smtp_connection_start)),
1650 s);
b4ed4da0
PH
1651}
1652
1653
1654
1655/*************************************************
059ec3d9
PH
1656* Check HELO line and set sender_helo_name *
1657*************************************************/
1658
1659/* Check the format of a HELO line. The data for HELO/EHLO is supposed to be
1660the domain name of the sending host, or an ip literal in square brackets. The
4c04137d 1661argument is placed in sender_helo_name, which is in malloc store, because it
059ec3d9
PH
1662must persist over multiple incoming messages. If helo_accept_junk is set, this
1663host is permitted to send any old junk (needed for some broken hosts).
1664Otherwise, helo_allow_chars can be used for rogue characters in general
1665(typically people want to let in underscores).
1666
1667Argument:
1668 s the data portion of the line (already past any white space)
1669
1670Returns: TRUE or FALSE
1671*/
1672
1673static BOOL
1674check_helo(uschar *s)
1675{
1676uschar *start = s;
1677uschar *end = s + Ustrlen(s);
1678BOOL yield = helo_accept_junk;
1679
1680/* Discard any previous helo name */
1681
1682if (sender_helo_name != NULL)
1683 {
1684 store_free(sender_helo_name);
1685 sender_helo_name = NULL;
1686 }
1687
1688/* Skip tests if junk is permitted. */
1689
1690if (!yield)
1691 {
1692 /* Allow the new standard form for IPv6 address literals, namely,
1693 [IPv6:....], and because someone is bound to use it, allow an equivalent
1694 IPv4 form. Allow plain addresses as well. */
1695
1696 if (*s == '[')
1697 {
1698 if (end[-1] == ']')
1699 {
1700 end[-1] = 0;
1701 if (strncmpic(s, US"[IPv6:", 6) == 0)
1702 yield = (string_is_ip_address(s+6, NULL) == 6);
1703 else if (strncmpic(s, US"[IPv4:", 6) == 0)
1704 yield = (string_is_ip_address(s+6, NULL) == 4);
1705 else
1706 yield = (string_is_ip_address(s+1, NULL) != 0);
1707 end[-1] = ']';
1708 }
1709 }
1710
1711 /* Non-literals must be alpha, dot, hyphen, plus any non-valid chars
1712 that have been configured (usually underscore - sigh). */
1713
1714 else if (*s != 0)
1715 {
1716 yield = TRUE;
1717 while (*s != 0)
1718 {
1719 if (!isalnum(*s) && *s != '.' && *s != '-' &&
1720 Ustrchr(helo_allow_chars, *s) == NULL)
1721 {
1722 yield = FALSE;
1723 break;
1724 }
1725 s++;
1726 }
1727 }
1728 }
1729
1730/* Save argument if OK */
1731
1732if (yield) sender_helo_name = string_copy_malloc(start);
1733return yield;
1734}
1735
1736
1737
1738
1739
1740/*************************************************
1741* Extract SMTP command option *
1742*************************************************/
1743
ca86f471 1744/* This function picks the next option setting off the end of smtp_cmd_data. It
059ec3d9
PH
1745is called for MAIL FROM and RCPT TO commands, to pick off the optional ESMTP
1746things that can appear there.
1747
1748Arguments:
1749 name point this at the name
1750 value point this at the data string
1751
1752Returns: TRUE if found an option
1753*/
1754
1755static BOOL
1756extract_option(uschar **name, uschar **value)
1757{
1758uschar *n;
ca86f471 1759uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1;
059ec3d9
PH
1760while (isspace(*v)) v--;
1761v[1] = 0;
d7a2c833
JH
1762while (v > smtp_cmd_data && *v != '=' && !isspace(*v))
1763 {
1764 /* Take care to not stop at a space embedded in a quoted local-part */
1765
1766 if (*v == '"') do v--; while (*v != '"' && v > smtp_cmd_data+1);
1767 v--;
1768 }
059ec3d9
PH
1769
1770n = v;
fd98a5c6
JH
1771if (*v == '=')
1772{
1773 while(isalpha(n[-1])) n--;
1774 /* RFC says SP, but TAB seen in wild and other major MTAs accept it */
1775 if (!isspace(n[-1])) return FALSE;
1776 n[-1] = 0;
1777}
1778else
1779{
1780 n++;
1781 if (v == smtp_cmd_data) return FALSE;
1782}
059ec3d9 1783*v++ = 0;
fd98a5c6 1784*name = n;
059ec3d9
PH
1785*value = v;
1786return TRUE;
1787}
1788
1789
1790
1791
1792
059ec3d9
PH
1793/*************************************************
1794* Reset for new message *
1795*************************************************/
1796
1797/* This function is called whenever the SMTP session is reset from
1798within either of the setup functions.
1799
1800Argument: the stacking pool storage reset point
1801Returns: nothing
1802*/
1803
1804static void
1805smtp_reset(void *reset_point)
1806{
059ec3d9
PH
1807store_reset(reset_point);
1808recipients_list = NULL;
1809rcpt_count = rcpt_defer_count = rcpt_fail_count =
1810 raw_recipients_count = recipients_count = recipients_list_max = 0;
2e5b33cd 1811cancel_cutthrough_connection("smtp reset");
2e0c1448 1812message_linecount = 0;
059ec3d9 1813message_size = -1;
71fafd95 1814acl_added_headers = NULL;
e7568d51 1815acl_removed_headers = NULL;
059ec3d9 1816queue_only_policy = FALSE;
2679d413
PH
1817rcpt_smtp_response = NULL;
1818rcpt_smtp_response_same = TRUE;
1819rcpt_in_progress = FALSE;
69358f02 1820deliver_freeze = FALSE; /* Can be set by ACL */
6a3f1455 1821freeze_tell = freeze_tell_config; /* Can be set by ACL */
29aba418 1822fake_response = OK; /* Can be set by ACL */
6951ac6c 1823#ifdef WITH_CONTENT_SCAN
8523533c
TK
1824no_mbox_unspool = FALSE; /* Can be set by ACL */
1825#endif
69358f02 1826submission_mode = FALSE; /* Can be set by ACL */
f4ee74ac 1827suppress_local_fixups = suppress_local_fixups_default; /* Can be set by ACL */
69358f02
PH
1828active_local_from_check = local_from_check; /* Can be set by ACL */
1829active_local_sender_retain = local_sender_retain; /* Can be set by ACL */
059ec3d9 1830sender_address = NULL;
2fe1a124 1831submission_name = NULL; /* Can be set by ACL */
059ec3d9
PH
1832raw_sender = NULL; /* After SMTP rewrite, before qualifying */
1833sender_address_unrewritten = NULL; /* Set only after verify rewrite */
1834sender_verified_list = NULL; /* No senders verified */
1835memset(sender_address_cache, 0, sizeof(sender_address_cache));
1836memset(sender_domain_cache, 0, sizeof(sender_domain_cache));
6c1c3d1d 1837
059ec3d9 1838authenticated_sender = NULL;
8523533c
TK
1839#ifdef EXPERIMENTAL_BRIGHTMAIL
1840bmi_run = 0;
1841bmi_verdicts = NULL;
1842#endif
80a47a2c 1843#ifndef DISABLE_DKIM
9e5d6b55 1844dkim_signers = NULL;
80a47a2c
TK
1845dkim_disable_verify = FALSE;
1846dkim_collect_input = FALSE;
f7572e5a 1847#endif
aa368db3
JH
1848dsn_ret = 0;
1849dsn_envid = NULL;
1850#ifndef DISABLE_PRDR
1851prdr_requested = FALSE;
1852#endif
8523533c
TK
1853#ifdef EXPERIMENTAL_SPF
1854spf_header_comment = NULL;
1855spf_received = NULL;
8e669ac1 1856spf_result = NULL;
8523533c
TK
1857spf_smtp_comment = NULL;
1858#endif
8c5d388a 1859#ifdef SUPPORT_I18N
d1a13eea
JH
1860message_smtputf8 = FALSE;
1861#endif
059ec3d9
PH
1862body_linecount = body_zerocount = 0;
1863
870f6ba8
TF
1864sender_rate = sender_rate_limit = sender_rate_period = NULL;
1865ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */
1866 /* Note that ratelimiters_conn persists across resets. */
1867
38a0a95f 1868/* Reset message ACL variables */
47ca6d6c 1869
38a0a95f 1870acl_var_m = NULL;
059ec3d9
PH
1871
1872/* The message body variables use malloc store. They may be set if this is
1873not the first message in an SMTP session and the previous message caused them
1874to be referenced in an ACL. */
1875
1876if (message_body != NULL)
1877 {
1878 store_free(message_body);
1879 message_body = NULL;
1880 }
1881
1882if (message_body_end != NULL)
1883 {
1884 store_free(message_body_end);
1885 message_body_end = NULL;
1886 }
1887
1888/* Warning log messages are also saved in malloc store. They are saved to avoid
1889repetition in the same message, but it seems right to repeat them for different
4e88a19f 1890messages. */
059ec3d9
PH
1891
1892while (acl_warn_logged != NULL)
1893 {
1894 string_item *this = acl_warn_logged;
1895 acl_warn_logged = acl_warn_logged->next;
1896 store_free(this);
1897 }
1898}
1899
1900
1901
1902
1903
1904/*************************************************
1905* Initialize for incoming batched SMTP message *
1906*************************************************/
1907
1908/* This function is called from smtp_setup_msg() in the case when
1909smtp_batched_input is true. This happens when -bS is used to pass a whole batch
1910of messages in one file with SMTP commands between them. All errors must be
1911reported by sending a message, and only MAIL FROM, RCPT TO, and DATA are
1912relevant. After an error on a sender, or an invalid recipient, the remainder
1913of the message is skipped. The value of received_protocol is already set.
1914
1915Argument: none
1916Returns: > 0 message successfully started (reached DATA)
1917 = 0 QUIT read or end of file reached
1918 < 0 should not occur
1919*/
1920
1921static int
1922smtp_setup_batch_msg(void)
1923{
1924int done = 0;
1925void *reset_point = store_get(0);
1926
1927/* Save the line count at the start of each transaction - single commands
1928like HELO and RSET count as whole transactions. */
1929
1930bsmtp_transaction_linecount = receive_linecount;
1931
1932if ((receive_feof)()) return 0; /* Treat EOF as QUIT */
1933
1934smtp_reset(reset_point); /* Reset for start of message */
1935
1936/* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE
1937value. The values are 2 larger than the required yield of the function. */
1938
1939while (done <= 0)
1940 {
1941 uschar *errmess;
1942 uschar *recipient = NULL;
1943 int start, end, sender_domain, recipient_domain;
1944
bd8fbe36 1945 switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
059ec3d9
PH
1946 {
1947 /* The HELO/EHLO commands set sender_address_helo if they have
1948 valid data; otherwise they are ignored, except that they do
1949 a reset of the state. */
1950
1951 case HELO_CMD:
1952 case EHLO_CMD:
1953
ca86f471 1954 check_helo(smtp_cmd_data);
059ec3d9
PH
1955 /* Fall through */
1956
1957 case RSET_CMD:
1958 smtp_reset(reset_point);
1959 bsmtp_transaction_linecount = receive_linecount;
1960 break;
1961
1962
1963 /* The MAIL FROM command requires an address as an operand. All we
1964 do here is to parse it for syntactic correctness. The form "<>" is
1965 a special case which converts into an empty string. The start/end
1966 pointers in the original are not used further for this address, as
1967 it is the canonical extracted address which is all that is kept. */
1968
1969 case MAIL_CMD:
474f71bf 1970 smtp_mailcmd_count++; /* Count for no-mail log */
059ec3d9
PH
1971 if (sender_address != NULL)
1972 /* The function moan_smtp_batch() does not return. */
3ee512ff 1973 moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given");
059ec3d9 1974
ca86f471 1975 if (smtp_cmd_data[0] == 0)
059ec3d9 1976 /* The function moan_smtp_batch() does not return. */
3ee512ff 1977 moan_smtp_batch(smtp_cmd_buffer, "501 MAIL FROM must have an address operand");
059ec3d9
PH
1978
1979 /* Reset to start of message */
1980
1981 smtp_reset(reset_point);
1982
1983 /* Apply SMTP rewrite */
1984
1985 raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)?
ca86f471
PH
1986 rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE,
1987 US"", global_rewrite_rules) : smtp_cmd_data;
059ec3d9
PH
1988
1989 /* Extract the address; the TRUE flag allows <> as valid */
1990
1991 raw_sender =
1992 parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain,
1993 TRUE);
1994
1995 if (raw_sender == NULL)
1996 /* The function moan_smtp_batch() does not return. */
3ee512ff 1997 moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess);
059ec3d9
PH
1998
1999 sender_address = string_copy(raw_sender);
2000
2001 /* Qualify unqualified sender addresses if permitted to do so. */
2002
2003 if (sender_domain == 0 && sender_address[0] != 0 && sender_address[0] != '@')
2004 {
2005 if (allow_unqualified_sender)
2006 {
2007 sender_address = rewrite_address_qualify(sender_address, FALSE);
2008 DEBUG(D_receive) debug_printf("unqualified address %s accepted "
2009 "and rewritten\n", raw_sender);
2010 }
2011 /* The function moan_smtp_batch() does not return. */
3ee512ff 2012 else moan_smtp_batch(smtp_cmd_buffer, "501 sender address must contain "
059ec3d9
PH
2013 "a domain");
2014 }
2015 break;
2016
2017
2018 /* The RCPT TO command requires an address as an operand. All we do
2019 here is to parse it for syntactic correctness. There may be any number
2020 of RCPT TO commands, specifying multiple senders. We build them all into
2021 a data structure that is in argc/argv format. The start/end values
2022 given by parse_extract_address are not used, as we keep only the
2023 extracted address. */
2024
2025 case RCPT_CMD:
2026 if (sender_address == NULL)
2027 /* The function moan_smtp_batch() does not return. */
3ee512ff 2028 moan_smtp_batch(smtp_cmd_buffer, "503 No sender yet given");
059ec3d9 2029
ca86f471 2030 if (smtp_cmd_data[0] == 0)
059ec3d9 2031 /* The function moan_smtp_batch() does not return. */
3ee512ff 2032 moan_smtp_batch(smtp_cmd_buffer, "501 RCPT TO must have an address operand");
059ec3d9
PH
2033
2034 /* Check maximum number allowed */
2035
2036 if (recipients_max > 0 && recipients_count + 1 > recipients_max)
2037 /* The function moan_smtp_batch() does not return. */
3ee512ff 2038 moan_smtp_batch(smtp_cmd_buffer, "%s too many recipients",
059ec3d9
PH
2039 recipients_max_reject? "552": "452");
2040
2041 /* Apply SMTP rewrite, then extract address. Don't allow "<>" as a
2042 recipient address */
2043
2685d6e0
JH
2044 recipient = rewrite_existflags & rewrite_smtp
2045 ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
2046 global_rewrite_rules)
2047 : smtp_cmd_data;
059ec3d9 2048
059ec3d9
PH
2049 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2050 &recipient_domain, FALSE);
059ec3d9 2051
2685d6e0 2052 if (!recipient)
059ec3d9 2053 /* The function moan_smtp_batch() does not return. */
3ee512ff 2054 moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess);
059ec3d9
PH
2055
2056 /* If the recipient address is unqualified, qualify it if permitted. Then
2057 add it to the list of recipients. */
2058
2059 if (recipient_domain == 0)
2060 {
2061 if (allow_unqualified_recipient)
2062 {
2063 DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
2064 recipient);
2065 recipient = rewrite_address_qualify(recipient, TRUE);
2066 }
2067 /* The function moan_smtp_batch() does not return. */
3ee512ff 2068 else moan_smtp_batch(smtp_cmd_buffer, "501 recipient address must contain "
059ec3d9
PH
2069 "a domain");
2070 }
2071 receive_add_recipient(recipient, -1);
2072 break;
2073
2074
2075 /* The DATA command is legal only if it follows successful MAIL FROM
2076 and RCPT TO commands. This function is complete when a valid DATA
2077 command is encountered. */
2078
2079 case DATA_CMD:
2080 if (sender_address == NULL || recipients_count <= 0)
2081 {
2082 /* The function moan_smtp_batch() does not return. */
2083 if (sender_address == NULL)
3ee512ff 2084 moan_smtp_batch(smtp_cmd_buffer,
059ec3d9
PH
2085 "503 MAIL FROM:<sender> command must precede DATA");
2086 else
3ee512ff 2087 moan_smtp_batch(smtp_cmd_buffer,
059ec3d9
PH
2088 "503 RCPT TO:<recipient> must precede DATA");
2089 }
2090 else
2091 {
2092 done = 3; /* DATA successfully achieved */
2093 message_ended = END_NOTENDED; /* Indicate in middle of message */
2094 }
2095 break;
2096
2097
2098 /* The VRFY, EXPN, HELP, ETRN, and NOOP commands are ignored. */
2099
2100 case VRFY_CMD:
2101 case EXPN_CMD:
2102 case HELP_CMD:
2103 case NOOP_CMD:
2104 case ETRN_CMD:
2105 bsmtp_transaction_linecount = receive_linecount;
2106 break;
2107
2108
2109 case EOF_CMD:
2110 case QUIT_CMD:
2111 done = 2;
2112 break;
2113
2114
2115 case BADARG_CMD:
2116 /* The function moan_smtp_batch() does not return. */
3ee512ff 2117 moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected argument data");
059ec3d9
PH
2118 break;
2119
2120
2121 case BADCHAR_CMD:
2122 /* The function moan_smtp_batch() does not return. */
3ee512ff 2123 moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected NULL in SMTP command");
059ec3d9
PH
2124 break;
2125
2126
2127 default:
2128 /* The function moan_smtp_batch() does not return. */
3ee512ff 2129 moan_smtp_batch(smtp_cmd_buffer, "500 Command unrecognized");
059ec3d9
PH
2130 break;
2131 }
2132 }
2133
2134return done - 2; /* Convert yield values */
2135}
2136
2137
2138
2139
2140/*************************************************
2141* Start an SMTP session *
2142*************************************************/
2143
2144/* This function is called at the start of an SMTP session. Thereafter,
2145smtp_setup_msg() is called to initiate each separate message. This
2146function does host-specific testing, and outputs the banner line.
2147
2148Arguments: none
2149Returns: FALSE if the session can not continue; something has
2150 gone wrong, or the connection to the host is blocked
2151*/
2152
2153BOOL
2154smtp_start_session(void)
2155{
2156int size = 256;
4e88a19f
PH
2157int ptr, esclen;
2158uschar *user_msg, *log_msg;
2159uschar *code, *esc;
059ec3d9
PH
2160uschar *p, *s, *ss;
2161
b4ed4da0
PH
2162smtp_connection_start = time(NULL);
2163for (smtp_ch_index = 0; smtp_ch_index < SMTP_HBUFF_SIZE; smtp_ch_index++)
2164 smtp_connection_had[smtp_ch_index] = SCH_NONE;
2165smtp_ch_index = 0;
2166
00f00ca5
PH
2167/* Default values for certain variables */
2168
059ec3d9 2169helo_seen = esmtp = helo_accept_junk = FALSE;
b4ed4da0 2170smtp_mailcmd_count = 0;
059ec3d9
PH
2171count_nonmail = TRUE_UNSET;
2172synprot_error_count = unknown_command_count = nonmail_command_count = 0;
2173smtp_delay_mail = smtp_rlm_base;
2174auth_advertised = FALSE;
2175pipelining_advertised = FALSE;
cf8b11a5 2176pipelining_enable = TRUE;
059ec3d9 2177sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING;
8f128379 2178smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */
059ec3d9 2179
33d73e3b
PH
2180/* If receiving by -bs from a trusted user, or testing with -bh, we allow
2181authentication settings from -oMaa to remain in force. */
2182
2183if (!host_checking && !sender_host_notsocket) sender_host_authenticated = NULL;
059ec3d9
PH
2184authenticated_by = NULL;
2185
2186#ifdef SUPPORT_TLS
817d9f57 2187tls_in.cipher = tls_in.peerdn = NULL;
9d1c15ef
JH
2188tls_in.ourcert = tls_in.peercert = NULL;
2189tls_in.sni = NULL;
44662487 2190tls_in.ocsp = OCSP_NOT_REQ;
059ec3d9
PH
2191tls_advertised = FALSE;
2192#endif
6c1c3d1d 2193dsn_advertised = FALSE;
8c5d388a 2194#ifdef SUPPORT_I18N
d1a13eea
JH
2195smtputf8_advertised = FALSE;
2196#endif
059ec3d9
PH
2197
2198/* Reset ACL connection variables */
2199
38a0a95f 2200acl_var_c = NULL;
059ec3d9 2201
ca86f471 2202/* Allow for trailing 0 in the command and data buffers. */
3ee512ff 2203
bd8fbe36 2204if (!(smtp_cmd_buffer = US malloc(2*SMTP_CMD_BUFFER_SIZE + 2)))
059ec3d9
PH
2205 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2206 "malloc() failed for SMTP command buffer");
40c90bca 2207
2416c261 2208smtp_cmd_buffer[0] = 0;
bd8fbe36 2209smtp_data_buffer = smtp_cmd_buffer + SMTP_CMD_BUFFER_SIZE + 1;
059ec3d9
PH
2210
2211/* For batched input, the protocol setting can be overridden from the
2212command line by a trusted caller. */
2213
2214if (smtp_batched_input)
2215 {
40c90bca 2216 if (!received_protocol) received_protocol = US"local-bsmtp";
059ec3d9
PH
2217 }
2218
2219/* For non-batched SMTP input, the protocol setting is forced here. It will be
2220reset later if any of EHLO/AUTH/STARTTLS are received. */
2221
2222else
2223 received_protocol =
e524074d 2224 (sender_host_address ? protocols : protocols_local) [pnormal];
059ec3d9
PH
2225
2226/* Set up the buffer for inputting using direct read() calls, and arrange to
2227call the local functions instead of the standard C ones. */
2228
bd8fbe36 2229if (!(smtp_inbuffer = (uschar *)malloc(IN_BUFFER_SIZE)))
059ec3d9 2230 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer");
40c90bca 2231
059ec3d9 2232receive_getc = smtp_getc;
584e96c6 2233receive_get_cache = smtp_get_cache;
059ec3d9
PH
2234receive_ungetc = smtp_ungetc;
2235receive_feof = smtp_feof;
2236receive_ferror = smtp_ferror;
58eb016e 2237receive_smtp_buffered = smtp_buffered;
059ec3d9
PH
2238smtp_inptr = smtp_inend = smtp_inbuffer;
2239smtp_had_eof = smtp_had_error = 0;
2240
2241/* Set up the message size limit; this may be host-specific */
2242
d45b1de8
PH
2243thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
2244if (expand_string_message != NULL)
059ec3d9
PH
2245 {
2246 if (thismessage_size_limit == -1)
2247 log_write(0, LOG_MAIN|LOG_PANIC, "unable to expand message_size_limit: "
2248 "%s", expand_string_message);
2249 else
2250 log_write(0, LOG_MAIN|LOG_PANIC, "invalid message_size_limit: "
2251 "%s", expand_string_message);
2252 smtp_closedown(US"Temporary local problem - please try later");
2253 return FALSE;
2254 }
2255
2256/* When a message is input locally via the -bs or -bS options, sender_host_
2257unknown is set unless -oMa was used to force an IP address, in which case it
2258is checked like a real remote connection. When -bs is used from inetd, this
2259flag is not set, causing the sending host to be checked. The code that deals
2260with IP source routing (if configured) is never required for -bs or -bS and
2261the flag sender_host_notsocket is used to suppress it.
2262
2263If smtp_accept_max and smtp_accept_reserve are set, keep some connections in
2264reserve for certain hosts and/or networks. */
2265
2266if (!sender_host_unknown)
2267 {
2268 int rc;
2269 BOOL reserved_host = FALSE;
2270
2271 /* Look up IP options (source routing info) on the socket if this is not an
2272 -oMa "host", and if any are found, log them and drop the connection.
2273
2274 Linux (and others now, see below) is different to everyone else, so there
2275 has to be some conditional compilation here. Versions of Linux before 2.1.15
2276 used a structure whose name was "options". Somebody finally realized that
2277 this name was silly, and it got changed to "ip_options". I use the
2278 newer name here, but there is a fudge in the script that sets up os.h
2279 to define a macro in older Linux systems.
2280
2281 Sigh. Linux is a fast-moving target. Another generation of Linux uses
2282 glibc 2, which has chosen ip_opts for the structure name. This is now
2283 really a glibc thing rather than a Linux thing, so the condition name
2284 has been changed to reflect this. It is relevant also to GNU/Hurd.
2285
2286 Mac OS 10.x (Darwin) is like the later glibc versions, but without the
2287 setting of the __GLIBC__ macro, so we can't detect it automatically. There's
2288 a special macro defined in the os.h file.
2289
2290 Some DGUX versions on older hardware appear not to support IP options at
2291 all, so there is now a general macro which can be set to cut out this
2292 support altogether.
2293
2294 How to do this properly in IPv6 is not yet known. */
2295
2296 #if !HAVE_IPV6 && !defined(NO_IP_OPTIONS)
2297
2298 #ifdef GLIBC_IP_OPTIONS
2299 #if (!defined __GLIBC__) || (__GLIBC__ < 2)
2300 #define OPTSTYLE 1
2301 #else
2302 #define OPTSTYLE 2
2303 #endif
2304 #elif defined DARWIN_IP_OPTIONS
2305 #define OPTSTYLE 2
2306 #else
2307 #define OPTSTYLE 3
2308 #endif
2309
2310 if (!host_checking && !sender_host_notsocket)
2311 {
2312 #if OPTSTYLE == 1
36a3b041 2313 EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN;
059ec3d9
PH
2314 struct ip_options *ipopt = store_get(optlen);
2315 #elif OPTSTYLE == 2
2316 struct ip_opts ipoptblock;
2317 struct ip_opts *ipopt = &ipoptblock;
36a3b041 2318 EXIM_SOCKLEN_T optlen = sizeof(ipoptblock);
059ec3d9
PH
2319 #else
2320 struct ipoption ipoptblock;
2321 struct ipoption *ipopt = &ipoptblock;
36a3b041 2322 EXIM_SOCKLEN_T optlen = sizeof(ipoptblock);
059ec3d9
PH
2323 #endif
2324
2325 /* Occasional genuine failures of getsockopt() have been seen - for
2326 example, "reset by peer". Therefore, just log and give up on this
2327 call, unless the error is ENOPROTOOPT. This error is given by systems
2328 that have the interfaces but not the mechanism - e.g. GNU/Hurd at the time
2329 of writing. So for that error, carry on - we just can't do an IP options
2330 check. */
2331
2332 DEBUG(D_receive) debug_printf("checking for IP options\n");
2333
2334 if (getsockopt(fileno(smtp_out), IPPROTO_IP, IP_OPTIONS, (uschar *)(ipopt),
2335 &optlen) < 0)
2336 {
2337 if (errno != ENOPROTOOPT)
2338 {
2339 log_write(0, LOG_MAIN, "getsockopt() failed from %s: %s",
2340 host_and_ident(FALSE), strerror(errno));
2341 smtp_printf("451 SMTP service not available\r\n");
2342 return FALSE;
2343 }
2344 }
2345
2346 /* Deal with any IP options that are set. On the systems I have looked at,
2347 the value of MAX_IPOPTLEN has been 40, meaning that there should never be
2348 more logging data than will fit in big_buffer. Nevertheless, after somebody
2349 questioned this code, I've added in some paranoid checking. */
2350
2351 else if (optlen > 0)
2352 {
2353 uschar *p = big_buffer;
2354 uschar *pend = big_buffer + big_buffer_size;
2355 uschar *opt, *adptr;
2356 int optcount;
2357 struct in_addr addr;
2358
2359 #if OPTSTYLE == 1
2360 uschar *optstart = (uschar *)(ipopt->__data);
2361 #elif OPTSTYLE == 2
2362 uschar *optstart = (uschar *)(ipopt->ip_opts);
2363 #else
2364 uschar *optstart = (uschar *)(ipopt->ipopt_list);
2365 #endif
2366
2367 DEBUG(D_receive) debug_printf("IP options exist\n");
2368
2369 Ustrcpy(p, "IP options on incoming call:");
2370 p += Ustrlen(p);
2371
2372 for (opt = optstart; opt != NULL &&
2373 opt < (uschar *)(ipopt) + optlen;)
2374 {
2375 switch (*opt)
2376 {
2377 case IPOPT_EOL:
2378 opt = NULL;
2379 break;
2380
2381 case IPOPT_NOP:
2382 opt++;
2383 break;
2384
2385 case IPOPT_SSRR:
2386 case IPOPT_LSRR:
2387 if (!string_format(p, pend-p, " %s [@%s",
2388 (*opt == IPOPT_SSRR)? "SSRR" : "LSRR",
2389 #if OPTSTYLE == 1
2390 inet_ntoa(*((struct in_addr *)(&(ipopt->faddr))))))
2391 #elif OPTSTYLE == 2
2392 inet_ntoa(ipopt->ip_dst)))
2393 #else
2394 inet_ntoa(ipopt->ipopt_dst)))
2395 #endif
2396 {
2397 opt = NULL;
2398 break;
2399 }
2400
2401 p += Ustrlen(p);
2402 optcount = (opt[1] - 3) / sizeof(struct in_addr);
2403 adptr = opt + 3;
2404 while (optcount-- > 0)
2405 {
2406 memcpy(&addr, adptr, sizeof(addr));
2407 if (!string_format(p, pend - p - 1, "%s%s",
2408 (optcount == 0)? ":" : "@", inet_ntoa(addr)))
2409 {
2410 opt = NULL;
2411 break;
2412 }
2413 p += Ustrlen(p);
2414 adptr += sizeof(struct in_addr);
2415 }
2416 *p++ = ']';
2417 opt += opt[1];
2418 break;
2419
2420 default:
2421 {
2422 int i;
2423 if (pend - p < 4 + 3*opt[1]) { opt = NULL; break; }
2424 Ustrcat(p, "[ ");
2425 p += 2;
2426 for (i = 0; i < opt[1]; i++)
2427 {
2428 sprintf(CS p, "%2.2x ", opt[i]);
2429 p += 3;
2430 }
2431 *p++ = ']';
2432 }
2433 opt += opt[1];
2434 break;
2435 }
2436 }
2437
2438 *p = 0;
2439 log_write(0, LOG_MAIN, "%s", big_buffer);
2440
2441 /* Refuse any call with IP options. This is what tcpwrappers 7.5 does. */
2442
2443 log_write(0, LOG_MAIN|LOG_REJECT,
2444 "connection from %s refused (IP options)", host_and_ident(FALSE));
2445
2446 smtp_printf("554 SMTP service not available\r\n");
2447 return FALSE;
2448 }
2449
2450 /* Length of options = 0 => there are no options */
2451
2452 else DEBUG(D_receive) debug_printf("no IP options found\n");
2453 }
2454 #endif /* HAVE_IPV6 && !defined(NO_IP_OPTIONS) */
2455
2456 /* Set keep-alive in socket options. The option is on by default. This
2457 setting is an attempt to get rid of some hanging connections that stick in
2458 read() when the remote end (usually a dialup) goes away. */
2459
2460 if (smtp_accept_keepalive && !sender_host_notsocket)
2461 ip_keepalive(fileno(smtp_out), sender_host_address, FALSE);
2462
2463 /* If the current host matches host_lookup, set the name by doing a
2464 reverse lookup. On failure, sender_host_name will be NULL and
2465 host_lookup_failed will be TRUE. This may or may not be serious - optional
2466 checks later. */
2467
2468 if (verify_check_host(&host_lookup) == OK)
2469 {
2470 (void)host_name_lookup();
2471 host_build_sender_fullhost();
2472 }
2473
2474 /* Delay this until we have the full name, if it is looked up. */
2475
2476 set_process_info("handling incoming connection from %s",
2477 host_and_ident(FALSE));
2478
1ad6489e
JH
2479 /* Expand smtp_receive_timeout, if needed */
2480
2481 if (smtp_receive_timeout_s)
2482 {
2483 uschar * exp;
2484 if ( !(exp = expand_string(smtp_receive_timeout_s))
2485 || !(*exp)
2486 || (smtp_receive_timeout = readconf_readtime(exp, 0, FALSE)) < 0
2487 )
2488 log_write(0, LOG_MAIN|LOG_PANIC,
2489 "bad value for smtp_receive_timeout: '%s'", exp ? exp : US"");
2490 }
2491
059ec3d9
PH
2492 /* Test for explicit connection rejection */
2493
2494 if (verify_check_host(&host_reject_connection) == OK)
2495 {
2496 log_write(L_connection_reject, LOG_MAIN|LOG_REJECT, "refused connection "
2497 "from %s (host_reject_connection)", host_and_ident(FALSE));
2498 smtp_printf("554 SMTP service not available\r\n");
2499 return FALSE;
2500 }
2501
afb3eaaf
PH
2502 /* Test with TCP Wrappers if so configured. There is a problem in that
2503 hosts_ctl() returns 0 (deny) under a number of system failure circumstances,
2504 such as disks dying. In these cases, it is desirable to reject with a 4xx
2505 error instead of a 5xx error. There isn't a "right" way to detect such
2506 problems. The following kludge is used: errno is zeroed before calling
2507 hosts_ctl(). If the result is "reject", a 5xx error is given only if the
2508 value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does
2509 not exist). */
059ec3d9 2510
1811cb4c 2511#ifdef USE_TCP_WRAPPERS
afb3eaaf 2512 errno = 0;
1811cb4c 2513 if (!(tcp_wrappers_name = expand_string(tcp_wrappers_daemon_name)))
5dc43717
JJ
2514 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2515 "(tcp_wrappers_name) failed: %s", string_printing(tcp_wrappers_name),
2516 expand_string_message);
1811cb4c 2517
5dc43717 2518 if (!hosts_ctl(tcp_wrappers_name,
1811cb4c
JH
2519 sender_host_name ? CS sender_host_name : STRING_UNKNOWN,
2520 sender_host_address ? CS sender_host_address : STRING_UNKNOWN,
2521 sender_ident ? CS sender_ident : STRING_UNKNOWN))
059ec3d9 2522 {
afb3eaaf
PH
2523 if (errno == 0 || errno == ENOENT)
2524 {
2525 HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n");
2526 log_write(L_connection_reject,
2527 LOG_MAIN|LOG_REJECT, "refused connection from %s "
2528 "(tcp wrappers)", host_and_ident(FALSE));
2529 smtp_printf("554 SMTP service not available\r\n");
2530 }
2531 else
2532 {
2533 int save_errno = errno;
2534 HDEBUG(D_receive) debug_printf("tcp wrappers rejected with unexpected "
2535 "errno value %d\n", save_errno);
2536 log_write(L_connection_reject,
2537 LOG_MAIN|LOG_REJECT, "temporarily refused connection from %s "
2538 "(tcp wrappers errno=%d)", host_and_ident(FALSE), save_errno);
2539 smtp_printf("451 Temporary local problem - please try later\r\n");
2540 }
059ec3d9
PH
2541 return FALSE;
2542 }
1811cb4c 2543#endif
059ec3d9 2544
b01dd148
PH
2545 /* Check for reserved slots. The value of smtp_accept_count has already been
2546 incremented to include this process. */
059ec3d9
PH
2547
2548 if (smtp_accept_max > 0 &&
b01dd148 2549 smtp_accept_count > smtp_accept_max - smtp_accept_reserve)
059ec3d9
PH
2550 {
2551 if ((rc = verify_check_host(&smtp_reserve_hosts)) != OK)
2552 {
2553 log_write(L_connection_reject,
2554 LOG_MAIN, "temporarily refused connection from %s: not in "
2555 "reserve list: connected=%d max=%d reserve=%d%s",
b01dd148 2556 host_and_ident(FALSE), smtp_accept_count - 1, smtp_accept_max,
059ec3d9
PH
2557 smtp_accept_reserve, (rc == DEFER)? " (lookup deferred)" : "");
2558 smtp_printf("421 %s: Too many concurrent SMTP connections; "
2559 "please try again later\r\n", smtp_active_hostname);
2560 return FALSE;
2561 }
2562 reserved_host = TRUE;
2563 }
2564
2565 /* If a load level above which only messages from reserved hosts are
2566 accepted is set, check the load. For incoming calls via the daemon, the
2567 check is done in the superior process if there are no reserved hosts, to
2568 save a fork. In all cases, the load average will already be available
2569 in a global variable at this point. */
2570
2571 if (smtp_load_reserve >= 0 &&
2572 load_average > smtp_load_reserve &&
2573 !reserved_host &&
2574 verify_check_host(&smtp_reserve_hosts) != OK)
2575 {
2576 log_write(L_connection_reject,
2577 LOG_MAIN, "temporarily refused connection from %s: not in "
2578 "reserve list and load average = %.2f", host_and_ident(FALSE),
2579 (double)load_average/1000.0);
2580 smtp_printf("421 %s: Too much load; please try again later\r\n",
2581 smtp_active_hostname);
2582 return FALSE;
2583 }
2584
2585 /* Determine whether unqualified senders or recipients are permitted
2586 for this host. Unfortunately, we have to do this every time, in order to
2587 set the flags so that they can be inspected when considering qualifying
2588 addresses in the headers. For a site that permits no qualification, this
2589 won't take long, however. */
2590
2591 allow_unqualified_sender =
2592 verify_check_host(&sender_unqualified_hosts) == OK;
2593
2594 allow_unqualified_recipient =
2595 verify_check_host(&recipient_unqualified_hosts) == OK;
2596
2597 /* Determine whether HELO/EHLO is required for this host. The requirement
2598 can be hard or soft. */
2599
2600 helo_required = verify_check_host(&helo_verify_hosts) == OK;
2601 if (!helo_required)
2602 helo_verify = verify_check_host(&helo_try_verify_hosts) == OK;
2603
2604 /* Determine whether this hosts is permitted to send syntactic junk
2605 after a HELO or EHLO command. */
2606
2607 helo_accept_junk = verify_check_host(&helo_accept_junk_hosts) == OK;
2608 }
2609
2610/* For batch SMTP input we are now done. */
2611
2612if (smtp_batched_input) return TRUE;
2613
a3c86431
TL
2614/* If valid Proxy Protocol source is connecting, set up session.
2615 * Failure will not allow any SMTP function other than QUIT. */
1811cb4c
JH
2616
2617#ifdef SUPPORT_PROXY
a3c86431
TL
2618proxy_session = FALSE;
2619proxy_session_failed = FALSE;
2620if (check_proxy_protocol_host())
1811cb4c
JH
2621 setup_proxy_protocol_host();
2622#endif
2623
2624 /* Start up TLS if tls_on_connect is set. This is for supporting the legacy
2625 smtps port for use with older style SSL MTAs. */
2626
2627#ifdef SUPPORT_TLS
2628 if (tls_in.on_connect && tls_server_start(tls_require_ciphers) != OK)
2629 return FALSE;
a3c86431
TL
2630#endif
2631
1811cb4c 2632/* Run the connect ACL if it exists */
059ec3d9 2633
4e88a19f 2634user_msg = NULL;
3cc3f762 2635if (acl_smtp_connect)
059ec3d9
PH
2636 {
2637 int rc;
3cc3f762
JH
2638 if ((rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg,
2639 &log_msg)) != OK)
059ec3d9 2640 {
3cc3f762 2641 (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg);
059ec3d9
PH
2642 return FALSE;
2643 }
2644 }
2645
2646/* Output the initial message for a two-way SMTP connection. It may contain
2647newlines, which then cause a multi-line response to be given. */
2648
4e88a19f
PH
2649code = US"220"; /* Default status code */
2650esc = US""; /* Default extended status code */
2651esclen = 0; /* Length of esc */
2652
d4ff61d1 2653if (!user_msg)
4e88a19f 2654 {
d4ff61d1 2655 if (!(s = expand_string(smtp_banner)))
4e88a19f
PH
2656 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) "
2657 "failed: %s", smtp_banner, expand_string_message);
2658 }
2659else
2660 {
2661 int codelen = 3;
2662 s = user_msg;
4f6ae5c3 2663 smtp_message_code(&code, &codelen, &s, NULL, TRUE);
d6a96edc 2664 if (codelen > 4)
4e88a19f
PH
2665 {
2666 esc = code + 4;
2667 esclen = codelen - 4;
2668 }
2669 }
059ec3d9
PH
2670
2671/* Remove any terminating newlines; might as well remove trailing space too */
2672
2673p = s + Ustrlen(s);
2674while (p > s && isspace(p[-1])) p--;
2675*p = 0;
2676
2677/* It seems that CC:Mail is braindead, and assumes that the greeting message
2678is all contained in a single IP packet. The original code wrote out the
2679greeting using several calls to fprint/fputc, and on busy servers this could
2680cause it to be split over more than one packet - which caused CC:Mail to fall
2681over when it got the second part of the greeting after sending its first
2682command. Sigh. To try to avoid this, build the complete greeting message
2683first, and output it in one fell swoop. This gives a better chance of it
2684ending up as a single packet. */
2685
2686ss = store_get(size);
2687ptr = 0;
2688
2689p = s;
2690do /* At least once, in case we have an empty string */
2691 {
2692 int len;
2693 uschar *linebreak = Ustrchr(p, '\n');
c2f669a4 2694 ss = string_catn(ss, &size, &ptr, code, 3);
059ec3d9
PH
2695 if (linebreak == NULL)
2696 {
2697 len = Ustrlen(p);
c2f669a4 2698 ss = string_catn(ss, &size, &ptr, US" ", 1);
059ec3d9
PH
2699 }
2700 else
2701 {
2702 len = linebreak - p;
c2f669a4 2703 ss = string_catn(ss, &size, &ptr, US"-", 1);
059ec3d9 2704 }
c2f669a4
JH
2705 ss = string_catn(ss, &size, &ptr, esc, esclen);
2706 ss = string_catn(ss, &size, &ptr, p, len);
2707 ss = string_catn(ss, &size, &ptr, US"\r\n", 2);
059ec3d9
PH
2708 p += len;
2709 if (linebreak != NULL) p++;
2710 }
2711while (*p != 0);
2712
2713ss[ptr] = 0; /* string_cat leaves room for this */
2714
2715/* Before we write the banner, check that there is no input pending, unless
2716this synchronisation check is disabled. */
2717
a14e5636 2718if (!check_sync())
059ec3d9 2719 {
a14e5636
PH
2720 log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol "
2721 "synchronization error (input sent without waiting for greeting): "
2722 "rejected connection from %s input=\"%s\"", host_and_ident(TRUE),
2723 string_printing(smtp_inptr));
2724 smtp_printf("554 SMTP synchronization error\r\n");
2725 return FALSE;
059ec3d9
PH
2726 }
2727
2728/* Now output the banner */
2729
2730smtp_printf("%s", ss);
2731return TRUE;
2732}
2733
2734
2735
2736
2737
2738/*************************************************
2739* Handle SMTP syntax and protocol errors *
2740*************************************************/
2741
2742/* Write to the log for SMTP syntax errors in incoming commands, if configured
2743to do so. Then transmit the error response. The return value depends on the
2744number of syntax and protocol errors in this SMTP session.
2745
2746Arguments:
2747 type error type, given as a log flag bit
2748 code response code; <= 0 means don't send a response
2749 data data to reflect in the response (can be NULL)
2750 errmess the error message
2751
2752Returns: -1 limit of syntax/protocol errors NOT exceeded
2753 +1 limit of syntax/protocol errors IS exceeded
2754
2755These values fit in with the values of the "done" variable in the main
2756processing loop in smtp_setup_msg(). */
2757
2758static int
2759synprot_error(int type, int code, uschar *data, uschar *errmess)
2760{
2761int yield = -1;
2762
2763log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s",
2764 (type == L_smtp_syntax_error)? "syntax" : "protocol",
3ee512ff 2765 string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess);
059ec3d9
PH
2766
2767if (++synprot_error_count > smtp_max_synprot_errors)
2768 {
2769 yield = 1;
2770 log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
2771 "syntax or protocol errors (last command was \"%s\")",
0ebc4d69 2772 host_and_ident(FALSE), string_printing(smtp_cmd_buffer));
059ec3d9
PH
2773 }
2774
2775if (code > 0)
2776 {
2777 smtp_printf("%d%c%s%s%s\r\n", code, (yield == 1)? '-' : ' ',
2778 (data == NULL)? US"" : data, (data == NULL)? US"" : US": ", errmess);
2779 if (yield == 1)
2780 smtp_printf("%d Too many syntax or protocol errors\r\n", code);
2781 }
2782
2783return yield;
2784}
2785
2786
2787
2788
2789/*************************************************
059ec3d9
PH
2790* Send SMTP response, possibly multiline *
2791*************************************************/
2792
2793/* There are, it seems, broken clients out there that cannot handle multiline
2794responses. If no_multiline_responses is TRUE (it can be set from an ACL), we
2795output nothing for non-final calls, and only the first line for anything else.
2796
2797Arguments:
a5bd321b 2798 code SMTP code, may involve extended status codes
d6a96edc 2799 codelen length of smtp code; if > 4 there's an ESC
059ec3d9
PH
2800 final FALSE if the last line isn't the final line
2801 msg message text, possibly containing newlines
2802
2803Returns: nothing
2804*/
2805
2806void
a5bd321b 2807smtp_respond(uschar* code, int codelen, BOOL final, uschar *msg)
059ec3d9 2808{
a5bd321b
PH
2809int esclen = 0;
2810uschar *esc = US"";
2811
059ec3d9
PH
2812if (!final && no_multiline_responses) return;
2813
d6a96edc 2814if (codelen > 4)
a5bd321b
PH
2815 {
2816 esc = code + 4;
2817 esclen = codelen - 4;
2818 }
2819
2679d413
PH
2820/* If this is the first output for a (non-batch) RCPT command, see if all RCPTs
2821have had the same. Note: this code is also present in smtp_printf(). It would
2822be tidier to have it only in one place, but when it was added, it was easier to
2823do it that way, so as not to have to mess with the code for the RCPT command,
2824which sometimes uses smtp_printf() and sometimes smtp_respond(). */
2825
2826if (rcpt_in_progress)
2827 {
2828 if (rcpt_smtp_response == NULL)
2829 rcpt_smtp_response = string_copy(msg);
2830 else if (rcpt_smtp_response_same &&
2831 Ustrcmp(rcpt_smtp_response, msg) != 0)
2832 rcpt_smtp_response_same = FALSE;
2833 rcpt_in_progress = FALSE;
2834 }
2835
2836/* Not output the message, splitting it up into multiple lines if necessary. */
2837
059ec3d9
PH
2838for (;;)
2839 {
2840 uschar *nl = Ustrchr(msg, '\n');
2841 if (nl == NULL)
2842 {
a5bd321b 2843 smtp_printf("%.3s%c%.*s%s\r\n", code, final? ' ':'-', esclen, esc, msg);
059ec3d9
PH
2844 return;
2845 }
2846 else if (nl[1] == 0 || no_multiline_responses)
2847 {
a5bd321b
PH
2848 smtp_printf("%.3s%c%.*s%.*s\r\n", code, final? ' ':'-', esclen, esc,
2849 (int)(nl - msg), msg);
059ec3d9
PH
2850 return;
2851 }
2852 else
2853 {
a5bd321b 2854 smtp_printf("%.3s-%.*s%.*s\r\n", code, esclen, esc, (int)(nl - msg), msg);
059ec3d9
PH
2855 msg = nl + 1;
2856 while (isspace(*msg)) msg++;
2857 }
2858 }
2859}
2860
2861
2862
2863
2864/*************************************************
4e88a19f
PH
2865* Parse user SMTP message *
2866*************************************************/
2867
2868/* This function allows for user messages overriding the response code details
2869by providing a suitable response code string at the start of the message
2870user_msg. Check the message for starting with a response code and optionally an
2871extended status code. If found, check that the first digit is valid, and if so,
2872change the code pointer and length to use the replacement. An invalid code
2873causes a panic log; in this case, if the log messages is the same as the user
2874message, we must also adjust the value of the log message to show the code that
2875is actually going to be used (the original one).
2876
2877This function is global because it is called from receive.c as well as within
2878this module.
2879
d6a96edc
PH
2880Note that the code length returned includes the terminating whitespace
2881character, which is always included in the regex match.
2882
4e88a19f
PH
2883Arguments:
2884 code SMTP code, may involve extended status codes
d6a96edc 2885 codelen length of smtp code; if > 4 there's an ESC
4e88a19f
PH
2886 msg message text
2887 log_msg optional log message, to be adjusted with the new SMTP code
4f6ae5c3 2888 check_valid if true, verify the response code
4e88a19f
PH
2889
2890Returns: nothing
2891*/
2892
2893void
4f6ae5c3
JH
2894smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg,
2895 BOOL check_valid)
4e88a19f
PH
2896{
2897int n;
2898int ovector[3];
2899
4f6ae5c3 2900if (!msg || !*msg) return;
4e88a19f 2901
4f6ae5c3
JH
2902if ((n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0,
2903 PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int))) < 0) return;
4e88a19f 2904
4f6ae5c3 2905if (check_valid && (*msg)[0] != (*code)[0])
4e88a19f
PH
2906 {
2907 log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with "
2908 "incorrect digit (expected %c) in \"%s\"", (*code)[0], *msg);
2909 if (log_msg != NULL && *log_msg == *msg)
2910 *log_msg = string_sprintf("%s %s", *code, *log_msg + ovector[1]);
2911 }
2912else
2913 {
2914 *code = *msg;
2915 *codelen = ovector[1]; /* Includes final space */
2916 }
2917*msg += ovector[1]; /* Chop the code off the message */
2918return;
2919}
2920
2921
2922
2923
2924/*************************************************
059ec3d9
PH
2925* Handle an ACL failure *
2926*************************************************/
2927
2928/* This function is called when acl_check() fails. As well as calls from within
2929this module, it is called from receive.c for an ACL after DATA. It sorts out
2930logging the incident, and sets up the error response. A message containing
2931newlines is turned into a multiline SMTP response, but for logging, only the
2932first line is used.
2933
a5bd321b
PH
2934There's a table of default permanent failure response codes to use in
2935globals.c, along with the table of names. VFRY is special. Despite RFC1123 it
2936defaults disabled in Exim. However, discussion in connection with RFC 821bis
2937(aka RFC 2821) has concluded that the response should be 252 in the disabled
2938state, because there are broken clients that try VRFY before RCPT. A 5xx
2939response should be given only when the address is positively known to be
4f6ae5c3
JH
2940undeliverable. Sigh. We return 252 if there is no VRFY ACL or it provides
2941no explicit code, but if there is one we let it know best.
2942Also, for ETRN, 458 is given on refusal, and for AUTH, 503.
a5bd321b
PH
2943
2944From Exim 4.63, it is possible to override the response code details by
2945providing a suitable response code string at the start of the message provided
2946in user_msg. The code's first digit is checked for validity.
059ec3d9
PH
2947
2948Arguments:
4f6ae5c3
JH
2949 where where the ACL was called from
2950 rc the failure code
2951 user_msg a message that can be included in an SMTP response
2952 log_msg a message for logging
059ec3d9
PH
2953
2954Returns: 0 in most cases
2955 2 if the failure code was FAIL_DROP, in which case the
2956 SMTP connection should be dropped (this value fits with the
2957 "done" variable in smtp_setup_msg() below)
2958*/
2959
2960int
2961smtp_handle_acl_fail(int where, int rc, uschar *user_msg, uschar *log_msg)
2962{
059ec3d9 2963BOOL drop = rc == FAIL_DROP;
a5bd321b 2964int codelen = 3;
a5bd321b 2965uschar *smtp_code;
059ec3d9
PH
2966uschar *lognl;
2967uschar *sender_info = US"";
64ffc24f 2968uschar *what =
8523533c 2969#ifdef WITH_CONTENT_SCAN
3cc3f762 2970 where == ACL_WHERE_MIME ? US"during MIME ACL checks" :
8e669ac1 2971#endif
3cc3f762
JH
2972 where == ACL_WHERE_PREDATA ? US"DATA" :
2973 where == ACL_WHERE_DATA ? US"after DATA" :
8ccd00b1 2974#ifndef DISABLE_PRDR
3cc3f762 2975 where == ACL_WHERE_PRDR ? US"after DATA PRDR" :
fd98a5c6 2976#endif
3cc3f762
JH
2977 smtp_cmd_data ?
2978 string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data) :
2979 string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]);
059ec3d9
PH
2980
2981if (drop) rc = FAIL;
2982
4e88a19f 2983/* Set the default SMTP code, and allow a user message to change it. */
a5bd321b 2984
4f6ae5c3
JH
2985smtp_code = rc == FAIL ? acl_wherecodes[where] : US"451";
2986smtp_message_code(&smtp_code, &codelen, &user_msg, &log_msg,
2987 where != ACL_WHERE_VRFY);
a5bd321b 2988
059ec3d9
PH
2989/* We used to have sender_address here; however, there was a bug that was not
2990updating sender_address after a rewrite during a verify. When this bug was
2991fixed, sender_address at this point became the rewritten address. I'm not sure
2992this is what should be logged, so I've changed to logging the unrewritten
2993address to retain backward compatibility. */
2994
8523533c 2995#ifndef WITH_CONTENT_SCAN
059ec3d9 2996if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA)
8523533c
TK
2997#else
2998if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA || where == ACL_WHERE_MIME)
2999#endif
059ec3d9 3000 {
b98bb9ac
PP
3001 sender_info = string_sprintf("F=<%s>%s%s%s%s ",
3002 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
3003 sender_host_authenticated ? US" A=" : US"",
3004 sender_host_authenticated ? sender_host_authenticated : US"",
3005 sender_host_authenticated && authenticated_id ? US":" : US"",
3006 sender_host_authenticated && authenticated_id ? authenticated_id : US""
3007 );
059ec3d9
PH
3008 }
3009
3010/* If there's been a sender verification failure with a specific message, and
3011we have not sent a response about it yet, do so now, as a preliminary line for
278c6e6c
PH
3012failures, but not defers. However, always log it for defer, and log it for fail
3013unless the sender_verify_fail log selector has been turned off. */
059ec3d9 3014
02b41d71 3015if (sender_verified_failed &&
059ec3d9
PH
3016 !testflag(sender_verified_failed, af_sverify_told))
3017 {
2679d413
PH
3018 BOOL save_rcpt_in_progress = rcpt_in_progress;
3019 rcpt_in_progress = FALSE; /* So as not to treat these as the error */
3020
059ec3d9
PH
3021 setflag(sender_verified_failed, af_sverify_told);
3022
6c6d6e48 3023 if (rc != FAIL || LOGGING(sender_verify_fail))
278c6e6c
PH
3024 log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s",
3025 host_and_ident(TRUE),
3026 ((sender_verified_failed->special_action & 255) == DEFER)? "defer":"fail",
3027 sender_verified_failed->address,
3028 (sender_verified_failed->message == NULL)? US"" :
3029 string_sprintf(": %s", sender_verified_failed->message));
059ec3d9 3030
02b41d71 3031 if (rc == FAIL && sender_verified_failed->user_message)
a5bd321b 3032 smtp_respond(smtp_code, codelen, FALSE, string_sprintf(
059ec3d9
PH
3033 testflag(sender_verified_failed, af_verify_pmfail)?
3034 "Postmaster verification failed while checking <%s>\n%s\n"
3035 "Several RFCs state that you are required to have a postmaster\n"
3036 "mailbox for each mail domain. This host does not accept mail\n"
3037 "from domains whose servers reject the postmaster address."
3038 :
3039 testflag(sender_verified_failed, af_verify_nsfail)?
3040 "Callback setup failed while verifying <%s>\n%s\n"
3041 "The initial connection, or a HELO or MAIL FROM:<> command was\n"
3042 "rejected. Refusing MAIL FROM:<> does not help fight spam, disregards\n"
3043 "RFC requirements, and stops you from receiving standard bounce\n"
3044 "messages. This host does not accept mail from domains whose servers\n"
3045 "refuse bounces."
3046 :
3047 "Verification failed for <%s>\n%s",
3048 sender_verified_failed->address,
3049 sender_verified_failed->user_message));
2679d413
PH
3050
3051 rcpt_in_progress = save_rcpt_in_progress;
059ec3d9
PH
3052 }
3053
3054/* Sort out text for logging */
3055
3cc3f762
JH
3056log_msg = log_msg ? string_sprintf(": %s", log_msg) : US"";
3057if ((lognl = Ustrchr(log_msg, '\n'))) *lognl = 0;
059ec3d9
PH
3058
3059/* Send permanent failure response to the command, but the code used isn't
3060always a 5xx one - see comments at the start of this function. If the original
3061rc was FAIL_DROP we drop the connection and yield 2. */
3062
ff5929e3
JH
3063if (rc == FAIL)
3064 smtp_respond(smtp_code, codelen, TRUE,
3065 user_msg ? user_msg : US"Administrative prohibition");
059ec3d9
PH
3066
3067/* Send temporary failure response to the command. Don't give any details,
3068unless acl_temp_details is set. This is TRUE for a callout defer, a "defer"
3069verb, and for a header verify when smtp_return_error_details is set.
3070
3071This conditional logic is all somewhat of a mess because of the odd
3072interactions between temp_details and return_error_details. One day it should
3073be re-implemented in a tidier fashion. */
3074
3075else
ff5929e3 3076 if (acl_temp_details && user_msg)
059ec3d9 3077 {
ff5929e3
JH
3078 if ( smtp_return_error_details
3079 && sender_verified_failed
3080 && sender_verified_failed->message
3081 )
a5bd321b 3082 smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message);
ff5929e3 3083
a5bd321b 3084 smtp_respond(smtp_code, codelen, TRUE, user_msg);
059ec3d9
PH
3085 }
3086 else
a5bd321b
PH
3087 smtp_respond(smtp_code, codelen, TRUE,
3088 US"Temporary local problem - please try later");
059ec3d9 3089
6ea85e9a
PH
3090/* Log the incident to the logs that are specified by log_reject_target
3091(default main, reject). This can be empty to suppress logging of rejections. If
3092the connection is not forcibly to be dropped, return 0. Otherwise, log why it
3093is closing if required and return 2. */
059ec3d9 3094
6ea85e9a 3095if (log_reject_target != 0)
887291d2 3096 {
e45a1c37 3097#ifdef SUPPORT_TLS
fc16abb4
JH
3098 uschar * tls = s_tlslog(NULL, NULL, NULL);
3099 if (!tls) tls = US"";
e45a1c37 3100#else
fc16abb4 3101 uschar * tls = US"";
e45a1c37 3102#endif
3cc3f762
JH
3103 log_write(where == ACL_WHERE_CONNECT ? L_connection_reject : 0,
3104 log_reject_target, "%s%s%s %s%srejected %s%s",
fc16abb4
JH
3105 LOGGING(dnssec) && sender_host_dnssec ? US" DS" : US"",
3106 host_and_ident(TRUE),
3107 tls,
3108 sender_info,
3109 rc == FAIL ? US"" : US"temporarily ",
3110 what, log_msg);
887291d2 3111 }
059ec3d9
PH
3112
3113if (!drop) return 0;
3114
3115log_write(L_smtp_connection, LOG_MAIN, "%s closed by DROP in ACL",
3116 smtp_get_connection_info());
8f128379
PH
3117
3118/* Run the not-quit ACL, but without any custom messages. This should not be a
3119problem, because we get here only if some other ACL has issued "drop", and
3120in that case, *its* custom messages will have been used above. */
3121
3122smtp_notquit_exit(US"acl-drop", NULL, NULL);
059ec3d9
PH
3123return 2;
3124}
3125
3126
3127
3128
3129/*************************************************
8f128379
PH
3130* Handle SMTP exit when QUIT is not given *
3131*************************************************/
3132
3133/* This function provides a logging/statistics hook for when an SMTP connection
3134is dropped on the floor or the other end goes away. It's a global function
3135because it's called from receive.c as well as this module. As well as running
3136the NOTQUIT ACL, if there is one, this function also outputs a final SMTP
3137response, either with a custom message from the ACL, or using a default. There
3138is one case, however, when no message is output - after "drop". In that case,
3139the ACL that obeyed "drop" has already supplied the custom message, and NULL is
3140passed to this function.
3141
3142In case things go wrong while processing this function, causing an error that
4c04137d 3143may re-enter this function, there is a recursion check.
8f128379
PH
3144
3145Arguments:
3146 reason What $smtp_notquit_reason will be set to in the ACL;
3147 if NULL, the ACL is not run
3148 code The error code to return as part of the response
3149 defaultrespond The default message if there's no user_msg
3150
3151Returns: Nothing
3152*/
3153
3154void
3155smtp_notquit_exit(uschar *reason, uschar *code, uschar *defaultrespond, ...)
3156{
3157int rc;
3158uschar *user_msg = NULL;
3159uschar *log_msg = NULL;
3160
3161/* Check for recursive acll */
3162
3163if (smtp_exit_function_called)
3164 {
3165 log_write(0, LOG_PANIC, "smtp_notquit_exit() called more than once (%s)",
3166 reason);
3167 return;
3168 }
3169smtp_exit_function_called = TRUE;
3170
3171/* Call the not-QUIT ACL, if there is one, unless no reason is given. */
3172
eea0defe 3173if (acl_smtp_notquit && reason)
8f128379
PH
3174 {
3175 smtp_notquit_reason = reason;
eea0defe
JB
3176 if ((rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg,
3177 &log_msg)) == ERROR)
8f128379
PH
3178 log_write(0, LOG_MAIN|LOG_PANIC, "ACL for not-QUIT returned ERROR: %s",
3179 log_msg);
3180 }
3181
3182/* Write an SMTP response if we are expected to give one. As the default
3183responses are all internal, they should always fit in the buffer, but code a
3184warning, just in case. Note that string_vformat() still leaves a complete
3185string, even if it is incomplete. */
3186
eea0defe 3187if (code && defaultrespond)
8f128379 3188 {
eea0defe
JB
3189 if (user_msg)
3190 smtp_respond(code, 3, TRUE, user_msg);
3191 else
8f128379
PH
3192 {
3193 uschar buffer[128];
3194 va_list ap;
3195 va_start(ap, defaultrespond);
3196 if (!string_vformat(buffer, sizeof(buffer), CS defaultrespond, ap))
3197 log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_notquit_exit()");
3198 smtp_printf("%s %s\r\n", code, buffer);
3199 va_end(ap);
3200 }
8f128379
PH
3201 mac_smtp_fflush();
3202 }
3203}
3204
3205
3206
3207
3208/*************************************************
d7b47fd0
PH
3209* Verify HELO argument *
3210*************************************************/
3211
3212/* This function is called if helo_verify_hosts or helo_try_verify_hosts is
3213matched. It is also called from ACL processing if verify = helo is used and
3214verification was not previously tried (i.e. helo_try_verify_hosts was not
3215matched). The result of its processing is to set helo_verified and
3216helo_verify_failed. These variables should both be FALSE for this function to
3217be called.
3218
3219Note that EHLO/HELO is legitimately allowed to quote an address literal. Allow
3220for IPv6 ::ffff: literals.
3221
3222Argument: none
3223Returns: TRUE if testing was completed;
3224 FALSE on a temporary failure
3225*/
3226
3227BOOL
3228smtp_verify_helo(void)
3229{
3230BOOL yield = TRUE;
3231
3232HDEBUG(D_receive) debug_printf("verifying EHLO/HELO argument \"%s\"\n",
3233 sender_helo_name);
3234
3235if (sender_helo_name == NULL)
3236 {
3237 HDEBUG(D_receive) debug_printf("no EHLO/HELO command was issued\n");
3238 }
3239
d1d5595c
PH
3240/* Deal with the case of -bs without an IP address */
3241
3242else if (sender_host_address == NULL)
3243 {
3244 HDEBUG(D_receive) debug_printf("no client IP address: assume success\n");
3245 helo_verified = TRUE;
3246 }
3247
3248/* Deal with the more common case when there is a sending IP address */
3249
d7b47fd0
PH
3250else if (sender_helo_name[0] == '[')
3251 {
3252 helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address,
3253 Ustrlen(sender_host_address)) == 0;
3254
3255 #if HAVE_IPV6
3256 if (!helo_verified)
3257 {
3258 if (strncmpic(sender_host_address, US"::ffff:", 7) == 0)
3259 helo_verified = Ustrncmp(sender_helo_name + 1,
3260 sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0;
3261 }
3262 #endif
3263
3264 HDEBUG(D_receive)
3265 { if (helo_verified) debug_printf("matched host address\n"); }
3266 }
3267
3268/* Do a reverse lookup if one hasn't already given a positive or negative
3269response. If that fails, or the name doesn't match, try checking with a forward
3270lookup. */
3271
3272else
3273 {
3274 if (sender_host_name == NULL && !host_lookup_failed)
3275 yield = host_name_lookup() != DEFER;
3276
3277 /* If a host name is known, check it and all its aliases. */
3278
1705dd20
JH
3279 if (sender_host_name)
3280 if ((helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0))
d7b47fd0 3281 {
1705dd20 3282 sender_helo_dnssec = sender_host_dnssec;
d7b47fd0
PH
3283 HDEBUG(D_receive) debug_printf("matched host name\n");
3284 }
3285 else
3286 {
3287 uschar **aliases = sender_host_aliases;
1705dd20
JH
3288 while (*aliases)
3289 if ((helo_verified = strcmpic(*aliases++, sender_helo_name) == 0))
3290 {
3291 sender_helo_dnssec = sender_host_dnssec;
3292 break;
3293 }
3294
3295 HDEBUG(D_receive) if (helo_verified)
d7b47fd0 3296 debug_printf("matched alias %s\n", *(--aliases));
d7b47fd0 3297 }
d7b47fd0
PH
3298
3299 /* Final attempt: try a forward lookup of the helo name */
3300
3301 if (!helo_verified)
3302 {
3303 int rc;
3304 host_item h;
1705dd20
JH
3305 dnssec_domains d;
3306 host_item *hh;
3307
d7b47fd0
PH
3308 h.name = sender_helo_name;
3309 h.address = NULL;
3310 h.mx = MX_NONE;
3311 h.next = NULL;
1705dd20
JH
3312 d.request = US"*";
3313 d.require = US"";
3314
d7b47fd0
PH
3315 HDEBUG(D_receive) debug_printf("getting IP address for %s\n",
3316 sender_helo_name);
1705dd20
JH
3317 rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A,
3318 NULL, NULL, NULL, &d, NULL, NULL);
d7b47fd0 3319 if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
1705dd20 3320 for (hh = &h; hh; hh = hh->next)
d7b47fd0
PH
3321 if (Ustrcmp(hh->address, sender_host_address) == 0)
3322 {
3323 helo_verified = TRUE;
1705dd20 3324 if (h.dnssec == DS_YES) sender_helo_dnssec = TRUE;
d7b47fd0 3325 HDEBUG(D_receive)
1705dd20
JH
3326 {
3327 debug_printf("IP address for %s matches calling address\n"
3328 "Forward DNS security status: %sverified\n",
3329 sender_helo_name, sender_helo_dnssec ? "" : "un");
3330 }
d7b47fd0
PH
3331 break;
3332 }
d7b47fd0
PH
3333 }
3334 }
3335
d1d5595c 3336if (!helo_verified) helo_verify_failed = TRUE; /* We've tried ... */
d7b47fd0
PH
3337return yield;
3338}
3339
3340
3341
3342
3343/*************************************************
4e88a19f
PH
3344* Send user response message *
3345*************************************************/
3346
3347/* This function is passed a default response code and a user message. It calls
3348smtp_message_code() to check and possibly modify the response code, and then
3349calls smtp_respond() to transmit the response. I put this into a function
3350just to avoid a lot of repetition.
3351
3352Arguments:
3353 code the response code
3354 user_msg the user message
3355
3356Returns: nothing
3357*/
3358
3359static void
3360smtp_user_msg(uschar *code, uschar *user_msg)
3361{
3362int len = 3;
4f6ae5c3 3363smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4e88a19f
PH
3364smtp_respond(code, len, TRUE, user_msg);
3365}
3366
3367
3368
b3ef41c9
JH
3369static int
3370smtp_in_auth(auth_instance *au, uschar ** s, uschar ** ss)
3371{
3372const uschar *set_id = NULL;
3373int rc, i;
3374
3375/* Run the checking code, passing the remainder of the command line as
3376data. Initials the $auth<n> variables as empty. Initialize $0 empty and set
3377it as the only set numerical variable. The authenticator may set $auth<n>
3378and also set other numeric variables. The $auth<n> variables are preferred
3379nowadays; the numerical variables remain for backwards compatibility.
3380
3381Afterwards, have a go at expanding the set_id string, even if
3382authentication failed - for bad passwords it can be useful to log the
3383userid. On success, require set_id to expand and exist, and put it in
3384authenticated_id. Save this in permanent store, as the working store gets
3385reset at HELO, RSET, etc. */
3386
3387for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
3388expand_nmax = 0;
3389expand_nlength[0] = 0; /* $0 contains nothing */
3390
3391rc = (au->info->servercode)(au, smtp_cmd_data);
3392if (au->set_id) set_id = expand_string(au->set_id);
3393expand_nmax = -1; /* Reset numeric variables */
3394for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */
3395
3396/* The value of authenticated_id is stored in the spool file and printed in
3397log lines. It must not contain binary zeros or newline characters. In
3398normal use, it never will, but when playing around or testing, this error
3399can (did) happen. To guard against this, ensure that the id contains only
3400printing characters. */
3401
3402if (set_id) set_id = string_printing(set_id);
3403
3404/* For the non-OK cases, set up additional logging data if set_id
3405is not empty. */
3406
3407if (rc != OK)
3408 set_id = set_id && *set_id
3409 ? string_sprintf(" (set_id=%s)", set_id) : US"";
3410
3411/* Switch on the result */
3412
3413switch(rc)
3414 {
3415 case OK:
3416 if (!au->set_id || set_id) /* Complete success */
3417 {
3418 if (set_id) authenticated_id = string_copy_malloc(set_id);
3419 sender_host_authenticated = au->name;
3420 authentication_failed = FALSE;
3421 authenticated_fail_id = NULL; /* Impossible to already be set? */
3422
3423 received_protocol =
3424 (sender_host_address ? protocols : protocols_local)
3425 [pextend + pauthed + (tls_in.active >= 0 ? pcrpted:0)];
3426 *s = *ss = US"235 Authentication succeeded";
3427 authenticated_by = au;
3428 break;
3429 }
3430
3431 /* Authentication succeeded, but we failed to expand the set_id string.
3432 Treat this as a temporary error. */
3433
3434 auth_defer_msg = expand_string_message;
3435 /* Fall through */
3436
3437 case DEFER:
3438 if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
3439 *s = string_sprintf("435 Unable to authenticate at present%s",
3440 auth_defer_user_msg);
3441 *ss = string_sprintf("435 Unable to authenticate at present%s: %s",
3442 set_id, auth_defer_msg);
3443 break;
3444
3445 case BAD64:
3446 *s = *ss = US"501 Invalid base64 data";
3447 break;
3448
3449 case CANCELLED:
3450 *s = *ss = US"501 Authentication cancelled";
3451 break;
3452
3453 case UNEXPECTED:
3454 *s = *ss = US"553 Initial data not expected";
3455 break;
3456
3457 case FAIL:
3458 if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
3459 *s = US"535 Incorrect authentication data";
3460 *ss = string_sprintf("535 Incorrect authentication data%s", set_id);
3461 break;
3462
3463 default:
3464 if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
3465 *s = US"435 Internal error";
3466 *ss = string_sprintf("435 Internal error%s: return %d from authentication "
3467 "check", set_id, rc);
3468 break;
3469 }
3470
3471return rc;
3472}
3473
3474
3475
2685d6e0
JH
3476
3477
3478static int
3479qualify_recipient(uschar ** recipient, uschar * smtp_cmd_data, uschar * tag)
3480{
3481int rd;
3482if (allow_unqualified_recipient || strcmpic(*recipient, US"postmaster") == 0)
3483 {
3484 DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
3485 *recipient);
3486 rd = Ustrlen(recipient) + 1;
3487 *recipient = rewrite_address_qualify(*recipient, TRUE);
3488 return rd;
3489 }
3490smtp_printf("501 %s: recipient address must contain a domain\r\n",
3491 smtp_cmd_data);
3492log_write(L_smtp_syntax_error,
3493 LOG_MAIN|LOG_REJECT, "unqualified %s rejected: <%s> %s%s",
3494 tag, *recipient, host_and_ident(TRUE), host_lookup_msg);
3495return 0;
3496}
3497
3498
3499
3500
7e3ce68e
JH
3501static void
3502smtp_quit_handler(uschar ** user_msgp, uschar ** log_msgp)
3503{
3504HAD(SCH_QUIT);
3505incomplete_transaction_log(US"QUIT");
60d10ce7 3506if (acl_smtp_quit)
7e3ce68e
JH
3507 {
3508 int rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, user_msgp, log_msgp);
3509 if (rc == ERROR)
3510 log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
3511 *log_msgp);
3512 }
3513if (*user_msgp)
3514 smtp_respond(US"221", 3, TRUE, *user_msgp);
3515else
3516 smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
3517
3518#ifdef SUPPORT_TLS
3519tls_close(TRUE, TRUE);
3520#endif
3521
3522log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
3523 smtp_get_connection_info());
3524}
3525
3526
3527static void
3528smtp_rset_handler(void)
3529{
3530HAD(SCH_RSET);
3531incomplete_transaction_log(US"RSET");
3532smtp_printf("250 Reset OK\r\n");
3533cmd_list[CMD_LIST_RSET].is_mail_cmd = FALSE;
3534}
3535
3536
3537
4e88a19f 3538/*************************************************
059ec3d9
PH
3539* Initialize for SMTP incoming message *
3540*************************************************/
3541
3542/* This function conducts the initial dialogue at the start of an incoming SMTP
3543message, and builds a list of recipients. However, if the incoming message
3544is part of a batch (-bS option) a separate function is called since it would
3545be messy having tests splattered about all over this function. This function
3546therefore handles the case where interaction is occurring. The input and output
3547files are set up in smtp_in and smtp_out.
3548
3549The global recipients_list is set to point to a vector of recipient_item
3550blocks, whose number is given by recipients_count. This is extended by the
3551receive_add_recipient() function. The global variable sender_address is set to
3552the sender's address. The yield is +1 if a message has been successfully
3553started, 0 if a QUIT command was encountered or the connection was refused from
3554the particular host, or -1 if the connection was lost.
3555
3556Argument: none
3557
3558Returns: > 0 message successfully started (reached DATA)
3559 = 0 QUIT read or end of file reached or call refused
3560 < 0 lost connection
3561*/
3562
3563int
3564smtp_setup_msg(void)
3565{
3566int done = 0;
3567BOOL toomany = FALSE;
3568BOOL discarded = FALSE;
3569BOOL last_was_rej_mail = FALSE;
3570BOOL last_was_rcpt = FALSE;
3571void *reset_point = store_get(0);
3572
3573DEBUG(D_receive) debug_printf("smtp_setup_msg entered\n");
3574
3575/* Reset for start of new message. We allow one RSET not to be counted as a
3576nonmail command, for those MTAs that insist on sending it between every
3577message. Ditto for EHLO/HELO and for STARTTLS, to allow for going in and out of
3578TLS between messages (an Exim client may do this if it has messages queued up
3579for the host). Note: we do NOT reset AUTH at this point. */
3580
3581smtp_reset(reset_point);
3582message_ended = END_NOTSTARTED;
3583
7e3ce68e
JH
3584chunking_state = chunking_offered ? CHUNKING_OFFERED : CHUNKING_NOT_OFFERED;
3585
059ec3d9
PH
3586cmd_list[CMD_LIST_RSET].is_mail_cmd = TRUE;
3587cmd_list[CMD_LIST_HELO].is_mail_cmd = TRUE;
3588cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE;
3589#ifdef SUPPORT_TLS
3590cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = TRUE;
b3ef41c9 3591cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE;
059ec3d9
PH
3592#endif
3593
3594/* Set the local signal handler for SIGTERM - it tries to end off tidily */
3595
3596os_non_restarting_signal(SIGTERM, command_sigterm_handler);
3597
3598/* Batched SMTP is handled in a different function. */
3599
3600if (smtp_batched_input) return smtp_setup_batch_msg();
3601
3602/* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE
3603value. The values are 2 larger than the required yield of the function. */
3604
3605while (done <= 0)
3606 {
55414b25 3607 const uschar **argv;
059ec3d9
PH
3608 uschar *etrn_command;
3609 uschar *etrn_serialize_key;
3610 uschar *errmess;
4e88a19f
PH
3611 uschar *log_msg, *smtp_code;
3612 uschar *user_msg = NULL;
059ec3d9
PH
3613 uschar *recipient = NULL;
3614 uschar *hello = NULL;
059ec3d9
PH
3615 uschar *s, *ss;
3616 BOOL was_rej_mail = FALSE;
3617 BOOL was_rcpt = FALSE;
3618 void (*oldsignal)(int);
3619 pid_t pid;
3620 int start, end, sender_domain, recipient_domain;
3621 int ptr, size, rc;
aa7751be 3622 int c;
059ec3d9 3623 auth_instance *au;
6c1c3d1d
WB
3624 uschar *orcpt = NULL;
3625 int flags;
059ec3d9 3626
16be7f11 3627#ifdef AUTH_TLS
b3ef41c9
JH
3628 /* Check once per STARTTLS or SSL-on-connect for a TLS AUTH */
3629 if ( tls_in.active >= 0
3630 && tls_in.peercert
3631 && tls_in.certificate_verified
3632 && cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd
3633 )
3634 {
3635 cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = FALSE;
4f6ae5c3
JH
3636 if ( acl_smtp_auth
3637 && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth,
3638 &user_msg, &log_msg)) != OK
3639 )
b3ef41c9 3640 {
4f6ae5c3
JH
3641 done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg);
3642 continue;
b3ef41c9
JH
3643 }
3644
3645 for (au = auths; au; au = au->next)
3646 if (strcmpic(US"tls", au->driver_name) == 0)
3647 {
3648 smtp_cmd_data = NULL;
3649
805bb5c3 3650 if (smtp_in_auth(au, &s, &ss) == OK)
cb570b5e 3651 { DEBUG(D_auth) debug_printf("tls auth succeeded\n"); }
805bb5c3 3652 else
cb570b5e 3653 { DEBUG(D_auth) debug_printf("tls auth not succeeded\n"); }
b3ef41c9
JH
3654 break;
3655 }
3656 }
3657#endif
3658
8d330698
JH
3659#ifdef TCP_QUICKACK
3660 if (smtp_in) /* Avoid pure-ACKs while in cmd pingpong phase */
3661 (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
3662 US &off, sizeof(off));
3663#endif
3664
bd8fbe36 3665 switch(smtp_read_command(TRUE, GETC_BUFFER_UNLIMITED))
059ec3d9
PH
3666 {
3667 /* The AUTH command is not permitted to occur inside a transaction, and may
c46782ef
PH
3668 occur successfully only once per connection. Actually, that isn't quite
3669 true. When TLS is started, all previous information about a connection must
3670 be discarded, so a new AUTH is permitted at that time.
3671
3672 AUTH may only be used when it has been advertised. However, it seems that
3673 there are clients that send AUTH when it hasn't been advertised, some of
3674 them even doing this after HELO. And there are MTAs that accept this. Sigh.
3675 So there's a get-out that allows this to happen.
059ec3d9
PH
3676
3677 AUTH is initially labelled as a "nonmail command" so that one occurrence
3678 doesn't get counted. We change the label here so that multiple failing
3679 AUTHS will eventually hit the nonmail threshold. */
3680
3681 case AUTH_CMD:
b4ed4da0 3682 HAD(SCH_AUTH);
059ec3d9
PH
3683 authentication_failed = TRUE;
3684 cmd_list[CMD_LIST_AUTH].is_mail_cmd = FALSE;
3685
c46782ef 3686 if (!auth_advertised && !allow_auth_unadvertised)
059ec3d9
PH
3687 {
3688 done = synprot_error(L_smtp_protocol_error, 503, NULL,
3689 US"AUTH command used when not advertised");
3690 break;
3691 }
b3ef41c9 3692 if (sender_host_authenticated)
059