Add compile-time guard against BDB library version 6
[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 },
69d8eed7 190 { "tls_auth", 0, TLS_AUTH_CMD, FALSE, FALSE },
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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
7e3ce68e 306/* forward declarations */
bd8fbe36 307static int smtp_read_command(BOOL check_sync, unsigned buffer_lim);
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308static int synprot_error(int type, int code, uschar *data, uschar *errmess);
309static void smtp_quit_handler(uschar **, uschar **);
310static void smtp_rset_handler(void);
311
059ec3d9 312/*************************************************
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313* Recheck synchronization *
314*************************************************/
315
316/* Synchronization checks can never be perfect because a packet may be on its
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317way but not arrived when the check is done. Normally, the checks happen when
318commands are read: Exim ensures that there is no more input in the input buffer.
319In normal cases, the response to the command will be fast, and there is no
320further check.
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321
322However, for some commands an ACL is run, and that can include delays. In those
323cases, it is useful to do another check on the input just before sending the
324response. This also applies at the start of a connection. This function does
325that check by means of the select() function, as long as the facility is not
326disabled or inappropriate. A failure of select() is ignored.
327
328When there is unwanted input, we read it so that it appears in the log of the
329error.
330
331Arguments: none
332Returns: TRUE if all is well; FALSE if there is input pending
333*/
334
335static BOOL
925ac8e4 336wouldblock_reading(void)
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337{
338int fd, rc;
339fd_set fds;
340struct timeval tzero;
341
9067f574 342#ifdef SUPPORT_TLS
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343if (tls_in.active >= 0)
344 return !tls_could_read();
9067f574 345#endif
f4630439 346
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347if (smtp_inptr < smtp_inend)
348 return FALSE;
349
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350fd = fileno(smtp_in);
351FD_ZERO(&fds);
352FD_SET(fd, &fds);
353tzero.tv_sec = 0;
354tzero.tv_usec = 0;
355rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero);
356
357if (rc <= 0) return TRUE; /* Not ready to read */
bd8fbe36 358rc = smtp_getc(GETC_BUFFER_UNLIMITED);
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359if (rc < 0) return TRUE; /* End of file or error */
360
361smtp_ungetc(rc);
362rc = smtp_inend - smtp_inptr;
363if (rc > 150) rc = 150;
364smtp_inptr[rc] = 0;
365return FALSE;
366}
367
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368static BOOL
369check_sync(void)
370{
371if (!smtp_enforce_sync || sender_host_address == NULL || sender_host_notsocket)
372 return TRUE;
373
374return wouldblock_reading();
375}
376
377
378/* If there's input waiting (and we're doing pipelineing) then we can pipeline
379a reponse with the one following. */
380
381static BOOL
382pipeline_response(void)
383{
384if ( !smtp_enforce_sync || !sender_host_address
385 || sender_host_notsocket || !pipelining_advertised)
386 return FALSE;
387
388return !wouldblock_reading();
389}
390
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391
392
393/*************************************************
394* Log incomplete transactions *
395*************************************************/
396
397/* This function is called after a transaction has been aborted by RSET, QUIT,
398connection drops or other errors. It logs the envelope information received
399so far in order to preserve address verification attempts.
400
401Argument: string to indicate what aborted the transaction
402Returns: nothing
403*/
404
405static void
406incomplete_transaction_log(uschar *what)
407{
408if (sender_address == NULL || /* No transaction in progress */
409 !LOGGING(smtp_incomplete_transaction))
410 return;
411
412/* Build list of recipients for logging */
413
414if (recipients_count > 0)
415 {
416 int i;
417 raw_recipients = store_get(recipients_count * sizeof(uschar *));
418 for (i = 0; i < recipients_count; i++)
419 raw_recipients[i] = recipients_list[i].address;
420 raw_recipients_count = recipients_count;
421 }
422
423log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS,
424 "%s incomplete transaction (%s)", host_and_ident(TRUE), what);
425}
426
427
428
429
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430/* Refill the buffer, and notify DKIM verification code.
431Return false for error or EOF.
432*/
433
434static BOOL
435smtp_refill(unsigned lim)
436{
437int rc, save_errno;
438if (!smtp_out) return FALSE;
439fflush(smtp_out);
440if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
441
442/* Limit amount read, so non-message data is not fed to DKIM */
443
444rc = read(fileno(smtp_in), smtp_inbuffer, MIN(IN_BUFFER_SIZE, lim));
445save_errno = errno;
446alarm(0);
447if (rc <= 0)
448 {
449 /* Must put the error text in fixed store, because this might be during
450 header reading, where it releases unused store above the header. */
451 if (rc < 0)
452 {
453 smtp_had_error = save_errno;
454 smtp_read_error = string_copy_malloc(
455 string_sprintf(" (error: %s)", strerror(save_errno)));
456 }
457 else smtp_had_eof = 1;
458 return FALSE;
459 }
460#ifndef DISABLE_DKIM
461dkim_exim_verify_feed(smtp_inbuffer, rc);
462#endif
463smtp_inend = smtp_inbuffer + rc;
464smtp_inptr = smtp_inbuffer;
465return TRUE;
466}
467
f4630439 468/*************************************************
059ec3d9
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469* SMTP version of getc() *
470*************************************************/
471
472/* This gets the next byte from the SMTP input buffer. If the buffer is empty,
473it flushes the output, and refills the buffer, with a timeout. The signal
474handler is set appropriately by the calling function. This function is not used
4c04137d 475after a connection has negotiated itself into an TLS/SSL state.
059ec3d9 476
bd8fbe36 477Arguments: lim Maximum amount to read/buffer
059ec3d9
PH
478Returns: the next character or EOF
479*/
480
481int
bd8fbe36 482smtp_getc(unsigned lim)
059ec3d9
PH
483{
484if (smtp_inptr >= smtp_inend)
0d81dabc 485 if (!smtp_refill(lim))
059ec3d9 486 return EOF;
059ec3d9
PH
487return *smtp_inptr++;
488}
489
0d81dabc
JH
490uschar *
491smtp_getbuf(unsigned * len)
492{
493unsigned size;
494uschar * buf;
495
496if (smtp_inptr >= smtp_inend)
497 if (!smtp_refill(*len))
498 { *len = 0; return NULL; }
499
500if ((size = smtp_inend - smtp_inptr) > *len) size = *len;
501buf = smtp_inptr;
502smtp_inptr += size;
503*len = size;
504return buf;
505}
506
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507void
508smtp_get_cache(void)
509{
9960d1e5 510#ifndef DISABLE_DKIM
584e96c6
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511int n = smtp_inend - smtp_inptr;
512if (n > 0)
513 dkim_exim_verify_feed(smtp_inptr, n);
584e96c6 514#endif
9960d1e5 515}
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516
517
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518/* Get a byte from the smtp input, in CHUNKING mode. Handle ack of the
519previous BDAT chunk and getting new ones when we run out. Uses the
520underlying smtp_getc or tls_getc both for that and for getting the
521(buffered) data byte. EOD signals (an expected) no further data.
522ERR signals a protocol error, and EOF a closed input stream.
523
524Called from read_bdat_smtp() in receive.c for the message body, but also
525by the headers read loop in receive_msg(); manipulates chunking_state
526to handle the BDAT command/response.
527Placed here due to the correlation with the above smtp_getc(), which it wraps,
528and also by the need to do smtp command/response handling.
529
bd8fbe36 530Arguments: lim (ignored)
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531Returns: the next character or ERR, EOD or EOF
532*/
533
534int
bd8fbe36 535bdat_getc(unsigned lim)
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536{
537uschar * user_msg = NULL;
538uschar * log_msg;
539
540for(;;)
541 {
79de4f37
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542#ifndef DISABLE_DKIM
543 BOOL dkim_save;
544#endif
545
bd8fbe36
JH
546 if (chunking_data_left > 0)
547 return lwr_receive_getc(chunking_data_left--);
7e3ce68e
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548
549 receive_getc = lwr_receive_getc;
0d81dabc 550 receive_getbuf = lwr_receive_getbuf;
7e3ce68e 551 receive_ungetc = lwr_receive_ungetc;
bd8fbe36 552#ifndef DISABLE_DKIM
79de4f37 553 dkim_save = dkim_collect_input;
bd8fbe36
JH
554 dkim_collect_input = FALSE;
555#endif
7e3ce68e 556
f4630439
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557 /* Unless PIPELINING was offered, there should be no next command
558 until after we ack that chunk */
559
560 if (!pipelining_advertised && !check_sync())
561 {
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562 unsigned n = smtp_inend - smtp_inptr;
563 if (n > 32) n = 32;
564
f4630439
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565 incomplete_transaction_log(US"sync failure");
566 log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error "
567 "(next input sent too soon: pipelining was not advertised): "
9e0ed81f 568 "rejected \"%s\" %s next input=\"%s\"%s",
f4630439 569 smtp_cmd_buffer, host_and_ident(TRUE),
9e0ed81f
JH
570 string_printing(string_copyn(smtp_inptr, n)),
571 smtp_inend - smtp_inptr > n ? "..." : "");
572 (void) synprot_error(L_smtp_protocol_error, 554, NULL,
573 US"SMTP synchronization error");
f4630439
JH
574 goto repeat_until_rset;
575 }
576
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577 /* If not the last, ack the received chunk. The last response is delayed
578 until after the data ACL decides on it */
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579
580 if (chunking_state == CHUNKING_LAST)
584e96c6
JH
581 {
582#ifndef DISABLE_DKIM
e983e85a 583 dkim_exim_verify_feed(NULL, 0); /* notify EOD */
584e96c6 584#endif
7e3ce68e 585 return EOD;
584e96c6 586 }
7e3ce68e 587
925ac8e4 588 smtp_printf("250 %u byte chunk received\r\n", FALSE, chunking_datasize);
bd8fbe36
JH
589 chunking_state = CHUNKING_OFFERED;
590 DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
7e3ce68e
JH
591
592 /* Expect another BDAT cmd from input. RFC 3030 says nothing about
593 QUIT, RSET or NOOP but handling them seems obvious */
594
595next_cmd:
bd8fbe36 596 switch(smtp_read_command(TRUE, 1))
7e3ce68e
JH
597 {
598 default:
599 (void) synprot_error(L_smtp_protocol_error, 503, NULL,
600 US"only BDAT permissible after non-LAST BDAT");
601
602 repeat_until_rset:
bd8fbe36 603 switch(smtp_read_command(TRUE, 1))
7e3ce68e
JH
604 {
605 case QUIT_CMD: smtp_quit_handler(&user_msg, &log_msg); /*FALLTHROUGH */
606 case EOF_CMD: return EOF;
607 case RSET_CMD: smtp_rset_handler(); return ERR;
608 default: if (synprot_error(L_smtp_protocol_error, 503, NULL,
609 US"only RSET accepted now") > 0)
610 return EOF;
611 goto repeat_until_rset;
612 }
613
614 case QUIT_CMD:
615 smtp_quit_handler(&user_msg, &log_msg);
616 /*FALLTHROUGH*/
617 case EOF_CMD:
618 return EOF;
619
620 case RSET_CMD:
621 smtp_rset_handler();
622 return ERR;
623
624 case NOOP_CMD:
625 HAD(SCH_NOOP);
925ac8e4 626 smtp_printf("250 OK\r\n", FALSE);
7e3ce68e
JH
627 goto next_cmd;
628
629 case BDAT_CMD:
630 {
631 int n;
632
633 if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1)
634 {
635 (void) synprot_error(L_smtp_protocol_error, 501, NULL,
636 US"missing size for BDAT command");
637 return ERR;
638 }
639 chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0
640 ? CHUNKING_LAST : CHUNKING_ACTIVE;
641 chunking_data_left = chunking_datasize;
bd8fbe36
JH
642 DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n",
643 (int)chunking_state, chunking_data_left);
7e3ce68e
JH
644
645 if (chunking_datasize == 0)
646 if (chunking_state == CHUNKING_LAST)
647 return EOD;
648 else
649 {
650 (void) synprot_error(L_smtp_protocol_error, 504, NULL,
651 US"zero size for BDAT command");
652 goto repeat_until_rset;
653 }
654
655 receive_getc = bdat_getc;
0d81dabc 656 receive_getbuf = bdat_getbuf;
7e3ce68e 657 receive_ungetc = bdat_ungetc;
bd8fbe36 658#ifndef DISABLE_DKIM
79de4f37 659 dkim_collect_input = dkim_save;
bd8fbe36 660#endif
7e3ce68e
JH
661 break; /* to top of main loop */
662 }
663 }
664 }
665}
666
0d81dabc
JH
667uschar *
668bdat_getbuf(unsigned * len)
669{
670uschar * buf;
671
672if (chunking_data_left <= 0)
673 { *len = 0; return NULL; }
674
675if (*len > chunking_data_left) *len = chunking_data_left;
676buf = lwr_receive_getbuf(len); /* Either smtp_getbuf or tls_getbuf */
677chunking_data_left -= *len;
678return buf;
679}
680
1ebe15c3 681void
45bd315d
JH
682bdat_flush_data(void)
683{
e99a3a6c
JH
684while (chunking_data_left)
685{
686 unsigned n = chunking_data_left;
687 (void) bdat_getbuf(&n);
688}
45bd315d
JH
689
690receive_getc = lwr_receive_getc;
0d81dabc 691receive_getbuf = lwr_receive_getbuf;
45bd315d
JH
692receive_ungetc = lwr_receive_ungetc;
693
694if (chunking_state != CHUNKING_LAST)
bd8fbe36 695 {
45bd315d 696 chunking_state = CHUNKING_OFFERED;
bd8fbe36
JH
697 DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
698 }
45bd315d
JH
699}
700
7e3ce68e
JH
701
702
703
059ec3d9
PH
704/*************************************************
705* SMTP version of ungetc() *
706*************************************************/
707
708/* Puts a character back in the input buffer. Only ever
709called once.
710
711Arguments:
712 ch the character
713
714Returns: the character
715*/
716
717int
718smtp_ungetc(int ch)
719{
7e3ce68e 720*--smtp_inptr = ch;
059ec3d9
PH
721return ch;
722}
723
724
7e3ce68e
JH
725int
726bdat_ungetc(int ch)
727{
728chunking_data_left++;
729return lwr_receive_ungetc(ch);
730}
731
059ec3d9
PH
732
733
734/*************************************************
735* SMTP version of feof() *
736*************************************************/
737
738/* Tests for a previous EOF
739
740Arguments: none
741Returns: non-zero if the eof flag is set
742*/
743
744int
745smtp_feof(void)
746{
747return smtp_had_eof;
748}
749
750
751
752
753/*************************************************
754* SMTP version of ferror() *
755*************************************************/
756
757/* Tests for a previous read error, and returns with errno
758restored to what it was when the error was detected.
759
760Arguments: none
761Returns: non-zero if the error flag is set
762*/
763
764int
765smtp_ferror(void)
766{
767errno = smtp_had_error;
768return smtp_had_error;
769}
770
771
772
58eb016e
PH
773/*************************************************
774* Test for characters in the SMTP buffer *
775*************************************************/
776
777/* Used at the end of a message
778
779Arguments: none
780Returns: TRUE/FALSE
781*/
782
783BOOL
784smtp_buffered(void)
785{
786return smtp_inptr < smtp_inend;
787}
788
789
059ec3d9
PH
790
791/*************************************************
792* Write formatted string to SMTP channel *
793*************************************************/
794
795/* This is a separate function so that we don't have to repeat everything for
796TLS support or debugging. It is global so that the daemon and the
797authentication functions can use it. It does not return any error indication,
798because major problems such as dropped connections won't show up till an output
799flush for non-TLS connections. The smtp_fflush() function is available for
800checking that: for convenience, TLS output errors are remembered here so that
801they are also picked up later by smtp_fflush().
802
803Arguments:
804 format format string
925ac8e4 805 more further data expected
059ec3d9
PH
806 ... optional arguments
807
808Returns: nothing
809*/
810
811void
925ac8e4 812smtp_printf(const char *format, BOOL more, ...)
059ec3d9
PH
813{
814va_list ap;
815
925ac8e4
JH
816va_start(ap, more);
817smtp_vprintf(format, more, ap);
ce552449
NM
818va_end(ap);
819}
820
821/* This is split off so that verify.c:respond_printf() can, in effect, call
822smtp_printf(), bearing in mind that in C a vararg function can't directly
fb08281f 823call another vararg function, only a function which accepts a va_list. */
ce552449
NM
824
825void
925ac8e4 826smtp_vprintf(const char *format, BOOL more, va_list ap)
ce552449 827{
fb08281f
DW
828BOOL yield;
829
830yield = string_vformat(big_buffer, big_buffer_size, format, ap);
ce552449 831
059ec3d9
PH
832DEBUG(D_receive)
833 {
fb08281f
DW
834 void *reset_point = store_get(0);
835 uschar *msg_copy, *cr, *end;
836 msg_copy = string_copy(big_buffer);
837 end = msg_copy + Ustrlen(msg_copy);
838 while ((cr = Ustrchr(msg_copy, '\r')) != NULL) /* lose CRs */
839 memmove(cr, cr + 1, (end--) - cr);
840 debug_printf("SMTP>> %s", msg_copy);
841 store_reset(reset_point);
059ec3d9
PH
842 }
843
fb08281f 844if (!yield)
2679d413
PH
845 {
846 log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf()");
847 smtp_closedown(US"Unexpected error");
9bfb7e1b 848 exim_exit(EXIT_FAILURE, NULL);
2679d413 849 }
2679d413
PH
850
851/* If this is the first output for a (non-batch) RCPT command, see if all RCPTs
852have had the same. Note: this code is also present in smtp_respond(). It would
853be tidier to have it only in one place, but when it was added, it was easier to
854do it that way, so as not to have to mess with the code for the RCPT command,
855which sometimes uses smtp_printf() and sometimes smtp_respond(). */
856
857if (rcpt_in_progress)
858 {
859 if (rcpt_smtp_response == NULL)
860 rcpt_smtp_response = string_copy(big_buffer);
861 else if (rcpt_smtp_response_same &&
862 Ustrcmp(rcpt_smtp_response, big_buffer) != 0)
863 rcpt_smtp_response_same = FALSE;
864 rcpt_in_progress = FALSE;
865 }
059ec3d9 866
2679d413 867/* Now write the string */
059ec3d9
PH
868
869#ifdef SUPPORT_TLS
817d9f57 870if (tls_in.active >= 0)
059ec3d9 871 {
925ac8e4 872 if (tls_write(TRUE, big_buffer, Ustrlen(big_buffer), more) < 0)
817d9f57 873 smtp_write_error = -1;
059ec3d9
PH
874 }
875else
876#endif
877
2679d413 878if (fprintf(smtp_out, "%s", big_buffer) < 0) smtp_write_error = -1;
059ec3d9
PH
879}
880
881
882
883/*************************************************
884* Flush SMTP out and check for error *
885*************************************************/
886
887/* This function isn't currently used within Exim (it detects errors when it
888tries to read the next SMTP input), but is available for use in local_scan().
889For non-TLS connections, it flushes the output and checks for errors. For
890TLS-connections, it checks for a previously-detected TLS write error.
891
892Arguments: none
893Returns: 0 for no error; -1 after an error
894*/
895
896int
897smtp_fflush(void)
898{
817d9f57 899if (tls_in.active < 0 && fflush(smtp_out) != 0) smtp_write_error = -1;
059ec3d9
PH
900return smtp_write_error;
901}
902
903
904
905/*************************************************
906* SMTP command read timeout *
907*************************************************/
908
909/* Signal handler for timing out incoming SMTP commands. This attempts to
910finish off tidily.
911
912Argument: signal number (SIGALRM)
913Returns: nothing
914*/
915
916static void
917command_timeout_handler(int sig)
918{
919sig = sig; /* Keep picky compilers happy */
920log_write(L_lost_incoming_connection,
921 LOG_MAIN, "SMTP command timeout on%s connection from %s",
817d9f57 922 (tls_in.active >= 0)? " TLS" : "",
059ec3d9
PH
923 host_and_ident(FALSE));
924if (smtp_batched_input)
925 moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */
8f128379
PH
926smtp_notquit_exit(US"command-timeout", US"421",
927 US"%s: SMTP command timeout - closing connection", smtp_active_hostname);
9bfb7e1b 928exim_exit(EXIT_FAILURE, US"receiving");
059ec3d9
PH
929}
930
931
932
933/*************************************************
934* SIGTERM received *
935*************************************************/
936
937/* Signal handler for handling SIGTERM. Again, try to finish tidily.
938
939Argument: signal number (SIGTERM)
940Returns: nothing
941*/
942
943static void
944command_sigterm_handler(int sig)
945{
946sig = sig; /* Keep picky compilers happy */
947log_write(0, LOG_MAIN, "%s closed after SIGTERM", smtp_get_connection_info());
948if (smtp_batched_input)
949 moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */
8f128379
PH
950smtp_notquit_exit(US"signal-exit", US"421",
951 US"%s: Service not available - closing connection", smtp_active_hostname);
9bfb7e1b 952exim_exit(EXIT_FAILURE, US"receiving");
059ec3d9
PH
953}
954
955
956
a14e5636 957
cee5f132 958#ifdef SUPPORT_PROXY
a3c86431 959/*************************************************
a3bddaa8
TL
960* Restore socket timeout to previous value *
961*************************************************/
962/* If the previous value was successfully retrieved, restore
963it before returning control to the non-proxy routines
964
965Arguments: fd - File descriptor for input
966 get_ok - Successfully retrieved previous values
967 tvtmp - Time struct with previous values
968 vslen - Length of time struct
969Returns: none
970*/
971static void
f267271d 972restore_socket_timeout(int fd, int get_ok, struct timeval * tvtmp, socklen_t vslen)
a3bddaa8
TL
973{
974if (get_ok == 0)
f267271d 975 (void) setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS tvtmp, vslen);
a3bddaa8
TL
976}
977
978/*************************************************
a3c86431
TL
979* Check if host is required proxy host *
980*************************************************/
981/* The function determines if inbound host will be a regular smtp host
1811cb4c
JH
982or if it is configured that it must use Proxy Protocol. A local
983connection cannot.
a3c86431
TL
984
985Arguments: none
986Returns: bool
987*/
988
989static BOOL
990check_proxy_protocol_host()
991{
992int rc;
a3c86431 993
1811cb4c
JH
994if ( sender_host_address
995 && (rc = verify_check_this_host(CUSS &hosts_proxy, NULL, NULL,
996 sender_host_address, NULL)) == OK)
a3c86431
TL
997 {
998 DEBUG(D_receive)
999 debug_printf("Detected proxy protocol configured host\n");
1000 proxy_session = TRUE;
1001 }
1002return proxy_session;
1003}
1004
1005
1006/*************************************************
3f251b3c
PP
1007* Read data until newline or end of buffer *
1008*************************************************/
1009/* While SMTP is server-speaks-first, TLS is client-speaks-first, so we can't
1010read an entire buffer and assume there will be nothing past a proxy protocol
1011header. Our approach normally is to use stdio, but again that relies upon
1012"STARTTLS\r\n" and a server response before the client starts TLS handshake, or
1013reading _nothing_ before client TLS handshake. So we don't want to use the
1014usual buffering reads which may read enough to block TLS starting.
1015
1016So unfortunately we're down to "read one byte at a time, with a syscall each,
1017and expect a little overhead", for all proxy-opened connections which are v1,
1018just to handle the TLS-on-connect case. Since SSL functions wrap the
1019underlying fd, we can't assume that we can feed them any already-read content.
1020
1021We need to know where to read to, the max capacity, and we'll read until we
1022get a CR and one more character. Let the caller scream if it's CR+!LF.
1023
1024Return the amount read.
1025*/
1026
1027static int
da88acae 1028swallow_until_crlf(int fd, uschar *base, int already, int capacity)
3f251b3c 1029{
2c0f3ea1
JH
1030uschar *to = base + already;
1031uschar *cr;
1032int have = 0;
1033int ret;
1034int last = 0;
1035
1036/* For "PROXY UNKNOWN\r\n" we, at time of writing, expect to have read
1037up through the \r; for the _normal_ case, we haven't yet seen the \r. */
da88acae 1038
2c0f3ea1
JH
1039cr = memchr(base, '\r', already);
1040if (cr != NULL)
1041 {
1042 if ((cr - base) < already - 1)
da88acae 1043 {
2c0f3ea1
JH
1044 /* \r and presumed \n already within what we have; probably not
1045 actually proxy protocol, but abort cleanly. */
1046 return 0;
da88acae 1047 }
2c0f3ea1
JH
1048 /* \r is last character read, just need one more. */
1049 last = 1;
1050 }
1051
1052while (capacity > 0)
1053 {
1054 do { ret = recv(fd, to, 1, 0); } while (ret == -1 && errno == EINTR);
1055 if (ret == -1)
1056 return -1;
1057 have++;
1058 if (last)
1059 return have;
1060 if (*to == '\r')
1061 last = 1;
1062 capacity--;
1063 to++;
1064 }
1065
1066/* reached end without having room for a final newline, abort */
1067errno = EOVERFLOW;
1068return -1;
3f251b3c
PP
1069}
1070
1071/*************************************************
a3c86431
TL
1072* Setup host for proxy protocol *
1073*************************************************/
1074/* The function configures the connection based on a header from the
1075inbound host to use Proxy Protocol. The specification is very exact
1076so exit with an error if do not find the exact required pieces. This
1077includes an incorrect number of spaces separating args.
1078
1079Arguments: none
f267271d 1080Returns: Boolean success
a3c86431
TL
1081*/
1082
1811cb4c 1083static void
a3c86431
TL
1084setup_proxy_protocol_host()
1085{
1086union {
1087 struct {
1088 uschar line[108];
1089 } v1;
1090 struct {
1091 uschar sig[12];
36719342
TL
1092 uint8_t ver_cmd;
1093 uint8_t fam;
1094 uint16_t len;
a3c86431
TL
1095 union {
1096 struct { /* TCP/UDP over IPv4, len = 12 */
1097 uint32_t src_addr;
1098 uint32_t dst_addr;
1099 uint16_t src_port;
1100 uint16_t dst_port;
1101 } ip4;
1102 struct { /* TCP/UDP over IPv6, len = 36 */
1103 uint8_t src_addr[16];
1104 uint8_t dst_addr[16];
1105 uint16_t src_port;
1106 uint16_t dst_port;
1107 } ip6;
1108 struct { /* AF_UNIX sockets, len = 216 */
1109 uschar src_addr[108];
1110 uschar dst_addr[108];
1111 } unx;
1112 } addr;
1113 } v2;
1114} hdr;
1115
eb57651e
TL
1116/* Temp variables used in PPv2 address:port parsing */
1117uint16_t tmpport;
1118char tmpip[INET_ADDRSTRLEN];
1119struct sockaddr_in tmpaddr;
1120char tmpip6[INET6_ADDRSTRLEN];
1121struct sockaddr_in6 tmpaddr6;
1122
da88acae
PP
1123/* We can't read "all data until end" because while SMTP is
1124server-speaks-first, the TLS handshake is client-speaks-first, so for
1125TLS-on-connect ports the proxy protocol header will usually be immediately
1126followed by a TLS handshake, and with N TLS libraries, we can't reliably
1127reinject data for reading by those. So instead we first read "enough to be
1128safely read within the header, and figure out how much more to read".
1129For v1 we will later read to the end-of-line, for v2 we will read based upon
1130the stated length.
1131
1132The v2 sig is 12 octets, and another 4 gets us the length, so we know how much
1133data is needed total. For v1, where the line looks like:
1134PROXY TCPn L3src L3dest SrcPort DestPort \r\n
1135
1136However, for v1 there's also `PROXY UNKNOWN\r\n` which is only 15 octets.
1137We seem to support that. So, if we read 14 octets then we can tell if we're
1138v2 or v1. If we're v1, we can continue reading as normal.
1139
1140If we're v2, we can't slurp up the entire header. We need the length in the
114115th & 16th octets, then to read everything after that.
1142
1143So to safely handle v1 and v2, with client-sent-first supported correctly,
1144we have to do a minimum of 3 read calls, not 1. Eww.
1145*/
1146
1147#define PROXY_INITIAL_READ 14
1148#define PROXY_V2_HEADER_SIZE 16
1149#if PROXY_INITIAL_READ > PROXY_V2_HEADER_SIZE
1150# error Code bug in sizes of data to read for proxy usage
1151#endif
1152
eb57651e 1153int get_ok = 0;
f267271d
JH
1154int size, ret;
1155int fd = fileno(smtp_in);
36719342 1156const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";
9e7e0f6a 1157uschar * iptype; /* To display debug info */
a3c86431 1158struct timeval tv;
a3bddaa8 1159struct timeval tvtmp;
f267271d 1160socklen_t vslen = sizeof(struct timeval);
1811cb4c 1161BOOL yield = FALSE;
a3c86431 1162
a3bddaa8 1163/* Save current socket timeout values */
f267271d 1164get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tvtmp, &vslen);
a3bddaa8 1165
a3c86431
TL
1166/* Proxy Protocol host must send header within a short time
1167(default 3 seconds) or it's considered invalid */
1168tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC;
1169tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC;
f267271d 1170if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tv, sizeof(tv)) < 0)
1811cb4c 1171 goto bad;
a3bddaa8 1172
a3c86431
TL
1173do
1174 {
eb57651e 1175 /* The inbound host was declared to be a Proxy Protocol host, so
2c0f3ea1
JH
1176 don't do a PEEK into the data, actually slurp up enough to be
1177 "safe". Can't take it all because TLS-on-connect clients follow
1178 immediately with TLS handshake. */
3f251b3c 1179 ret = recv(fd, &hdr, PROXY_INITIAL_READ, 0);
a3c86431
TL
1180 }
1181 while (ret == -1 && errno == EINTR);
1182
1183if (ret == -1)
f267271d 1184 goto proxyfail;
a3c86431 1185
da88acae
PP
1186/* For v2, handle reading the length, and then the rest. */
1187if ((ret == PROXY_INITIAL_READ) && (memcmp(&hdr.v2, v2sig, sizeof(v2sig)) == 0))
a3c86431 1188 {
da88acae
PP
1189 int retmore;
1190 uint8_t ver;
1191
1192 /* First get the length fields. */
1193 do
1194 {
1195 retmore = recv(fd, (uschar*)&hdr + ret, PROXY_V2_HEADER_SIZE - PROXY_INITIAL_READ, 0);
1196 } while (retmore == -1 && errno == EINTR);
1197 if (retmore == -1)
3f251b3c 1198 goto proxyfail;
da88acae 1199 ret += retmore;
3f251b3c
PP
1200
1201 ver = (hdr.v2.ver_cmd & 0xf0) >> 4;
36719342
TL
1202
1203 /* May 2014: haproxy combined the version and command into one byte to
2c0f3ea1
JH
1204 allow two full bytes for the length field in order to proxy SSL
1205 connections. SSL Proxy is not supported in this version of Exim, but
1206 must still separate values here. */
36719342
TL
1207
1208 if (ver != 0x02)
1209 {
1210 DEBUG(D_receive) debug_printf("Invalid Proxy Protocol version: %d\n", ver);
1211 goto proxyfail;
1212 }
da88acae 1213
36719342 1214 /* The v2 header will always be 16 bytes per the spec. */
5d036699 1215 size = 16 + ntohs(hdr.v2.len);
da88acae
PP
1216 DEBUG(D_receive) debug_printf("Detected PROXYv2 header, size %d (limit %d)\n",
1217 size, (int)sizeof(hdr));
1218
1219 /* We should now have 16 octets (PROXY_V2_HEADER_SIZE), and we know the total
1220 amount that we need. Double-check that the size is not unreasonable, then
1221 get the rest. */
1222 if (size > sizeof(hdr))
a3c86431 1223 {
da88acae 1224 DEBUG(D_receive) debug_printf("PROXYv2 header size unreasonably large; security attack?\n");
a3c86431
TL
1225 goto proxyfail;
1226 }
da88acae
PP
1227
1228 do
1229 {
1230 do
1231 {
1232 retmore = recv(fd, (uschar*)&hdr + ret, size-ret, 0);
1233 } while (retmore == -1 && errno == EINTR);
1234 if (retmore == -1)
1235 goto proxyfail;
1236 ret += retmore;
1237 DEBUG(D_receive) debug_printf("PROXYv2: have %d/%d required octets\n", ret, size);
1238 } while (ret < size);
1239
1240 } /* end scope for getting rest of data for v2 */
1241
1242/* At this point: if PROXYv2, we've read the exact size required for all data;
1243if PROXYv1 then we've read "less than required for any valid line" and should
1244read the rest". */
1245
1246if (ret >= 16 && memcmp(&hdr.v2, v2sig, 12) == 0)
1247 {
1248 uint8_t cmd = (hdr.v2.ver_cmd & 0x0f);
1249
36719342 1250 switch (cmd)
a3c86431
TL
1251 {
1252 case 0x01: /* PROXY command */
1253 switch (hdr.v2.fam)
1254 {
eb57651e
TL
1255 case 0x11: /* TCPv4 address type */
1256 iptype = US"IPv4";
1257 tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr;
5d036699
JH
1258 inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
1259 if (!string_is_ip_address(US tmpip, NULL))
eb57651e
TL
1260 {
1261 DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
f267271d 1262 goto proxyfail;
eb57651e 1263 }
e6d2a989 1264 proxy_local_address = sender_host_address;
eb57651e
TL
1265 sender_host_address = string_copy(US tmpip);
1266 tmpport = ntohs(hdr.v2.addr.ip4.src_port);
e6d2a989 1267 proxy_local_port = sender_host_port;
eb57651e
TL
1268 sender_host_port = tmpport;
1269 /* Save dest ip/port */
1270 tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr;
5d036699
JH
1271 inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
1272 if (!string_is_ip_address(US tmpip, NULL))
eb57651e
TL
1273 {
1274 DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
f267271d 1275 goto proxyfail;
eb57651e 1276 }
7a2fa0bc 1277 proxy_external_address = string_copy(US tmpip);
eb57651e 1278 tmpport = ntohs(hdr.v2.addr.ip4.dst_port);
7a2fa0bc 1279 proxy_external_port = tmpport;
a3c86431 1280 goto done;
eb57651e
TL
1281 case 0x21: /* TCPv6 address type */
1282 iptype = US"IPv6";
1283 memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16);
5d036699
JH
1284 inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
1285 if (!string_is_ip_address(US tmpip6, NULL))
eb57651e
TL
1286 {
1287 DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
f267271d 1288 goto proxyfail;
eb57651e 1289 }
e6d2a989 1290 proxy_local_address = sender_host_address;
eb57651e
TL
1291 sender_host_address = string_copy(US tmpip6);
1292 tmpport = ntohs(hdr.v2.addr.ip6.src_port);
e6d2a989 1293 proxy_local_port = sender_host_port;
eb57651e
TL
1294 sender_host_port = tmpport;
1295 /* Save dest ip/port */
1296 memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16);
5d036699
JH
1297 inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
1298 if (!string_is_ip_address(US tmpip6, NULL))
eb57651e
TL
1299 {
1300 DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
f267271d 1301 goto proxyfail;
eb57651e 1302 }
7a2fa0bc 1303 proxy_external_address = string_copy(US tmpip6);
eb57651e 1304 tmpport = ntohs(hdr.v2.addr.ip6.dst_port);
7a2fa0bc 1305 proxy_external_port = tmpport;
a3c86431 1306 goto done;
eb57651e
TL
1307 default:
1308 DEBUG(D_receive)
1309 debug_printf("Unsupported PROXYv2 connection type: 0x%02x\n",
1310 hdr.v2.fam);
1311 goto proxyfail;
a3c86431
TL
1312 }
1313 /* Unsupported protocol, keep local connection address */
1314 break;
1315 case 0x00: /* LOCAL command */
1316 /* Keep local connection address for LOCAL */
9e7e0f6a 1317 iptype = US"local";
a3c86431
TL
1318 break;
1319 default:
eb57651e 1320 DEBUG(D_receive)
36719342 1321 debug_printf("Unsupported PROXYv2 command: 0x%x\n", cmd);
a3c86431
TL
1322 goto proxyfail;
1323 }
1324 }
5d036699 1325else if (ret >= 8 && memcmp(hdr.v1.line, "PROXY", 5) == 0)
a3c86431 1326 {
3f251b3c
PP
1327 uschar *p;
1328 uschar *end;
a3c86431
TL
1329 uschar *sp; /* Utility variables follow */
1330 int tmp_port;
3f251b3c 1331 int r2;
a3c86431
TL
1332 char *endc;
1333
3f251b3c 1334 /* get the rest of the line */
da88acae 1335 r2 = swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret);
3f251b3c
PP
1336 if (r2 == -1)
1337 goto proxyfail;
1338 ret += r2;
1339
1340 p = string_copy(hdr.v1.line);
1341 end = memchr(p, '\r', ret - 1);
1342
da88acae 1343 if (!end || (end == (uschar*)&hdr + ret) || end[1] != '\n')
a3c86431
TL
1344 {
1345 DEBUG(D_receive) debug_printf("Partial or invalid PROXY header\n");
1346 goto proxyfail;
1347 }
1348 *end = '\0'; /* Terminate the string */
a5d4db40 1349 size = end + 2 - p; /* Skip header + CRLF */
a3c86431 1350 DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n");
3f251b3c 1351 DEBUG(D_receive) debug_printf("Bytes read not within PROXY header: %d\n", ret - size);
a3c86431 1352 /* Step through the string looking for the required fields. Ensure
2c0f3ea1 1353 strict adherence to required formatting, exit for any error. */
a3c86431
TL
1354 p += 5;
1355 if (!isspace(*(p++)))
1356 {
1357 DEBUG(D_receive) debug_printf("Missing space after PROXY command\n");
1358 goto proxyfail;
1359 }
1360 if (!Ustrncmp(p, CCS"TCP4", 4))
1361 iptype = US"IPv4";
1362 else if (!Ustrncmp(p,CCS"TCP6", 4))
1363 iptype = US"IPv6";
1364 else if (!Ustrncmp(p,CCS"UNKNOWN", 7))
1365 {
1366 iptype = US"Unknown";
1367 goto done;
1368 }
1369 else
1370 {
1371 DEBUG(D_receive) debug_printf("Invalid TCP type\n");
1372 goto proxyfail;
1373 }
1374
1375 p += Ustrlen(iptype);
1376 if (!isspace(*(p++)))
1377 {
1378 DEBUG(D_receive) debug_printf("Missing space after TCP4/6 command\n");
1379 goto proxyfail;
1380 }
1381 /* Find the end of the arg */
1382 if ((sp = Ustrchr(p, ' ')) == NULL)
1383 {
1384 DEBUG(D_receive)
1385 debug_printf("Did not find proxied src %s\n", iptype);
1386 goto proxyfail;
1387 }
1388 *sp = '\0';
5d036699 1389 if(!string_is_ip_address(p, NULL))
a3c86431
TL
1390 {
1391 DEBUG(D_receive)
1392 debug_printf("Proxied src arg is not an %s address\n", iptype);
1393 goto proxyfail;
1394 }
e6d2a989 1395 proxy_local_address = sender_host_address;
a3c86431
TL
1396 sender_host_address = p;
1397 p = sp + 1;
1398 if ((sp = Ustrchr(p, ' ')) == NULL)
1399 {
1400 DEBUG(D_receive)
1401 debug_printf("Did not find proxy dest %s\n", iptype);
1402 goto proxyfail;
1403 }
1404 *sp = '\0';
5d036699 1405 if(!string_is_ip_address(p, NULL))
a3c86431
TL
1406 {
1407 DEBUG(D_receive)
1408 debug_printf("Proxy dest arg is not an %s address\n", iptype);
1409 goto proxyfail;
1410 }
7a2fa0bc 1411 proxy_external_address = p;
a3c86431
TL
1412 p = sp + 1;
1413 if ((sp = Ustrchr(p, ' ')) == NULL)
1414 {
1415 DEBUG(D_receive) debug_printf("Did not find proxied src port\n");
1416 goto proxyfail;
1417 }
1418 *sp = '\0';
5d036699 1419 tmp_port = strtol(CCS p, &endc, 10);
a3c86431
TL
1420 if (*endc || tmp_port == 0)
1421 {
1422 DEBUG(D_receive)
1423 debug_printf("Proxied src port '%s' not an integer\n", p);
1424 goto proxyfail;
1425 }
e6d2a989 1426 proxy_local_port = sender_host_port;
a3c86431
TL
1427 sender_host_port = tmp_port;
1428 p = sp + 1;
1429 if ((sp = Ustrchr(p, '\0')) == NULL)
1430 {
1431 DEBUG(D_receive) debug_printf("Did not find proxy dest port\n");
1432 goto proxyfail;
1433 }
5d036699 1434 tmp_port = strtol(CCS p, &endc, 10);
a3c86431
TL
1435 if (*endc || tmp_port == 0)
1436 {
1437 DEBUG(D_receive)
1438 debug_printf("Proxy dest port '%s' not an integer\n", p);
1439 goto proxyfail;
1440 }
7a2fa0bc 1441 proxy_external_port = tmp_port;
a3c86431 1442 /* Already checked for /r /n above. Good V1 header received. */
a3c86431
TL
1443 }
1444else
1445 {
1446 /* Wrong protocol */
eb57651e 1447 DEBUG(D_receive) debug_printf("Invalid proxy protocol version negotiation\n");
da88acae 1448 (void) swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret);
a3c86431
TL
1449 goto proxyfail;
1450 }
1451
1811cb4c
JH
1452done:
1453 DEBUG(D_receive)
1454 debug_printf("Valid %s sender from Proxy Protocol header\n", iptype);
1455 yield = proxy_session;
1456
1457/* Don't flush any potential buffer contents. Any input on proxyfail
1458should cause a synchronization failure */
1459
a3c86431 1460proxyfail:
1811cb4c 1461 restore_socket_timeout(fd, get_ok, &tvtmp, vslen);
a3c86431 1462
1811cb4c
JH
1463bad:
1464 if (yield)
1465 {
1466 sender_host_name = NULL;
1467 (void) host_name_lookup();
1468 host_build_sender_fullhost();
1469 }
1470 else
1471 {
1472 proxy_session_failed = TRUE;
1473 DEBUG(D_receive)
1474 debug_printf("Failure to extract proxied host, only QUIT allowed\n");
1475 }
1476
1477return;
a3c86431
TL
1478}
1479#endif
1480
059ec3d9
PH
1481/*************************************************
1482* Read one command line *
1483*************************************************/
1484
1485/* Strictly, SMTP commands coming over the net are supposed to end with CRLF.
1486There are sites that don't do this, and in any case internal SMTP probably
1487should check only for LF. Consequently, we check here for LF only. The line
1488ends up with [CR]LF removed from its end. If we get an overlong line, treat as
3ee512ff
PH
1489an unknown command. The command is read into the global smtp_cmd_buffer so that
1490it is available via $smtp_command.
059ec3d9
PH
1491
1492The character reading routine sets up a timeout for each block actually read
1493from the input (which may contain more than one command). We set up a special
1494signal handler that closes down the session on a timeout. Control does not
1495return when it runs.
1496
1497Arguments:
bd8fbe36
JH
1498 check_sync if TRUE, check synchronization rules if global option is TRUE
1499 buffer_lim maximum to buffer in lower layer
059ec3d9
PH
1500
1501Returns: a code identifying the command (enumerated above)
1502*/
1503
1504static int
bd8fbe36 1505smtp_read_command(BOOL check_sync, unsigned buffer_lim)
059ec3d9
PH
1506{
1507int c;
1508int ptr = 0;
1509smtp_cmd_list *p;
1510BOOL hadnull = FALSE;
1511
1512os_non_restarting_signal(SIGALRM, command_timeout_handler);
1513
bd8fbe36 1514while ((c = (receive_getc)(buffer_lim)) != '\n' && c != EOF)
059ec3d9 1515 {
bd8fbe36 1516 if (ptr >= SMTP_CMD_BUFFER_SIZE)
059ec3d9
PH
1517 {
1518 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1519 return OTHER_CMD;
1520 }
1521 if (c == 0)
1522 {
1523 hadnull = TRUE;
1524 c = '?';
1525 }
3ee512ff 1526 smtp_cmd_buffer[ptr++] = c;
059ec3d9
PH
1527 }
1528
1529receive_linecount++; /* For BSMTP errors */
1530os_non_restarting_signal(SIGALRM, sigalrm_handler);
1531
1532/* If hit end of file, return pseudo EOF command. Whether we have a
1533part-line already read doesn't matter, since this is an error state. */
1534
1535if (c == EOF) return EOF_CMD;
1536
1537/* Remove any CR and white space at the end of the line, and terminate the
1538string. */
1539
3ee512ff
PH
1540while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--;
1541smtp_cmd_buffer[ptr] = 0;
059ec3d9 1542
3ee512ff 1543DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer);
059ec3d9
PH
1544
1545/* NULLs are not allowed in SMTP commands */
1546
1547if (hadnull) return BADCHAR_CMD;
1548
1549/* Scan command list and return identity, having set the data pointer
1550to the start of the actual data characters. Check for SMTP synchronization
1551if required. */
1552
1553for (p = cmd_list; p < cmd_list_end; p++)
1554 {
1811cb4c 1555#ifdef SUPPORT_PROXY
a3c86431 1556 /* Only allow QUIT command if Proxy Protocol parsing failed */
1811cb4c
JH
1557 if (proxy_session && proxy_session_failed && p->cmd != QUIT_CMD)
1558 continue;
1559#endif
2f460950
JH
1560 if ( p->len
1561 && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0
1562 && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */
1563 || smtp_cmd_buffer[p->len] == 0
1564 || smtp_cmd_buffer[p->len] == ' '
1565 ) )
059ec3d9
PH
1566 {
1567 if (smtp_inptr < smtp_inend && /* Outstanding input */
1568 p->cmd < sync_cmd_limit && /* Command should sync */
1569 check_sync && /* Local flag set */
1570 smtp_enforce_sync && /* Global flag set */
1571 sender_host_address != NULL && /* Not local input */
1572 !sender_host_notsocket) /* Really is a socket */
1573 return BADSYN_CMD;
1574
ca86f471
PH
1575 /* The variables $smtp_command and $smtp_command_argument point into the
1576 unmodified input buffer. A copy of the latter is taken for actual
1577 processing, so that it can be chopped up into separate parts if necessary,
1578 for example, when processing a MAIL command options such as SIZE that can
1579 follow the sender address. */
059ec3d9 1580
3ee512ff 1581 smtp_cmd_argument = smtp_cmd_buffer + p->len;
ca86f471
PH
1582 while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++;
1583 Ustrcpy(smtp_data_buffer, smtp_cmd_argument);
1584 smtp_cmd_data = smtp_data_buffer;
059ec3d9
PH
1585
1586 /* Count non-mail commands from those hosts that are controlled in this
1587 way. The default is all hosts. We don't waste effort checking the list
1588 until we get a non-mail command, but then cache the result to save checking
1589 again. If there's a DEFER while checking the host, assume it's in the list.
1590
1591 Note that one instance of RSET, EHLO/HELO, and STARTTLS is allowed at the
1592 start of each incoming message by fiddling with the value in the table. */
1593
1594 if (!p->is_mail_cmd)
1595 {
1596 if (count_nonmail == TRUE_UNSET) count_nonmail =
1597 verify_check_host(&smtp_accept_max_nonmail_hosts) != FAIL;
1598 if (count_nonmail && ++nonmail_command_count > smtp_accept_max_nonmail)
1599 return TOO_MANY_NONMAIL_CMD;
1600 }
1601
ca86f471
PH
1602 /* If there is data for a command that does not expect it, generate the
1603 error here. */
059ec3d9 1604
ca86f471 1605 return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD;
059ec3d9
PH
1606 }
1607 }
1608
cee5f132 1609#ifdef SUPPORT_PROXY
a3c86431
TL
1610/* Only allow QUIT command if Proxy Protocol parsing failed */
1611if (proxy_session && proxy_session_failed)
1612 return PROXY_FAIL_IGNORE_CMD;
1613#endif
1614
059ec3d9
PH
1615/* Enforce synchronization for unknown commands */
1616
1617if (smtp_inptr < smtp_inend && /* Outstanding input */
1618 check_sync && /* Local flag set */
1619 smtp_enforce_sync && /* Global flag set */
1620 sender_host_address != NULL && /* Not local input */
1621 !sender_host_notsocket) /* Really is a socket */
1622 return BADSYN_CMD;
1623
1624return OTHER_CMD;
1625}
1626
1627
1628
1629/*************************************************
1630* Forced closedown of call *
1631*************************************************/
1632
1633/* This function is called from log.c when Exim is dying because of a serious
1634disaster, and also from some other places. If an incoming non-batched SMTP
1635channel is open, it swallows the rest of the incoming message if in the DATA
1636phase, sends the reply string, and gives an error to all subsequent commands
1637except QUIT. The existence of an SMTP call is detected by the non-NULLness of
1638smtp_in.
1639
8f128379
PH
1640Arguments:
1641 message SMTP reply string to send, excluding the code
1642
059ec3d9
PH
1643Returns: nothing
1644*/
1645
1646void
1647smtp_closedown(uschar *message)
1648{
1649if (smtp_in == NULL || smtp_batched_input) return;
1650receive_swallow_smtp();
925ac8e4 1651smtp_printf("421 %s\r\n", FALSE, message);
059ec3d9 1652
bd8fbe36 1653for (;;) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
059ec3d9 1654 {
60d10ce7
JH
1655 case EOF_CMD:
1656 return;
059ec3d9 1657
60d10ce7 1658 case QUIT_CMD:
925ac8e4 1659 smtp_printf("221 %s closing connection\r\n", FALSE, smtp_active_hostname);
60d10ce7
JH
1660 mac_smtp_fflush();
1661 return;
059ec3d9 1662
60d10ce7 1663 case RSET_CMD:
925ac8e4 1664 smtp_printf("250 Reset OK\r\n", FALSE);
60d10ce7 1665 break;
059ec3d9 1666
60d10ce7 1667 default:
925ac8e4 1668 smtp_printf("421 %s\r\n", FALSE, message);
60d10ce7 1669 break;
059ec3d9
PH
1670 }
1671}
1672
1673
1674
1675
1676/*************************************************
1677* Set up connection info for logging *
1678*************************************************/
1679
1680/* This function is called when logging information about an SMTP connection.
1681It sets up appropriate source information, depending on the type of connection.
dac79d3e
PH
1682If sender_fullhost is NULL, we are at a very early stage of the connection;
1683just use the IP address.
059ec3d9
PH
1684
1685Argument: none
1686Returns: a string describing the connection
1687*/
1688
1689uschar *
1690smtp_get_connection_info(void)
1691{
f5d25c2b
JH
1692const uschar * hostname = sender_fullhost
1693 ? sender_fullhost : sender_host_address;
dac79d3e 1694
059ec3d9 1695if (host_checking)
dac79d3e 1696 return string_sprintf("SMTP connection from %s", hostname);
059ec3d9
PH
1697
1698if (sender_host_unknown || sender_host_notsocket)
1699 return string_sprintf("SMTP connection from %s", sender_ident);
1700
1701if (is_inetd)
dac79d3e 1702 return string_sprintf("SMTP connection from %s (via inetd)", hostname);
059ec3d9 1703
6c6d6e48 1704if (LOGGING(incoming_interface) && interface_address != NULL)
dac79d3e 1705 return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname,
059ec3d9
PH
1706 interface_address, interface_port);
1707
dac79d3e 1708return string_sprintf("SMTP connection from %s", hostname);
059ec3d9
PH
1709}
1710
1711
1712
e45a1c37 1713#ifdef SUPPORT_TLS
887291d2
JH
1714/* Append TLS-related information to a log line
1715
1716Arguments:
acec9514 1717 g String under construction: allocated string to extend, or NULL
887291d2
JH
1718
1719Returns: Allocated string or NULL
1720*/
acec9514
JH
1721static gstring *
1722s_tlslog(gstring * g)
e45a1c37 1723{
acec9514
JH
1724if (LOGGING(tls_cipher) && tls_in.cipher)
1725 g = string_append(g, 2, US" X=", tls_in.cipher);
1726if (LOGGING(tls_certificate_verified) && tls_in.cipher)
1727 g = string_append(g, 2, US" CV=", tls_in.certificate_verified? "yes":"no");
1728if (LOGGING(tls_peerdn) && tls_in.peerdn)
1729 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
1730if (LOGGING(tls_sni) && tls_in.sni)
1731 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
1732return g;
e45a1c37
JH
1733}
1734#endif
1735
059ec3d9 1736/*************************************************
b4ed4da0
PH
1737* Log lack of MAIL if so configured *
1738*************************************************/
1739
1740/* This function is called when an SMTP session ends. If the log selector
1741smtp_no_mail is set, write a log line giving some details of what has happened
1742in the SMTP session.
1743
1744Arguments: none
1745Returns: nothing
1746*/
1747
1748void
1749smtp_log_no_mail(void)
1750{
acec9514
JH
1751int i;
1752uschar * sep, * s;
1753gstring * g = NULL;
b4ed4da0 1754
6c6d6e48 1755if (smtp_mailcmd_count > 0 || !LOGGING(smtp_no_mail))
b4ed4da0
PH
1756 return;
1757
b4ed4da0
PH
1758if (sender_host_authenticated != NULL)
1759 {
acec9514
JH
1760 g = string_append(g, 2, US" A=", sender_host_authenticated);
1761 if (authenticated_id) g = string_append(g, 2, US":", authenticated_id);
b4ed4da0
PH
1762 }
1763
1764#ifdef SUPPORT_TLS
acec9514 1765g = s_tlslog(g);
3f0945ff 1766#endif
b4ed4da0 1767
acec9514
JH
1768sep = smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE ? US" C=..." : US" C=";
1769
b4ed4da0 1770for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++)
b4ed4da0
PH
1771 if (smtp_connection_had[i] != SCH_NONE)
1772 {
acec9514 1773 g = string_append(g, 2, sep, smtp_names[smtp_connection_had[i]]);
b4ed4da0
PH
1774 sep = US",";
1775 }
b4ed4da0
PH
1776
1777for (i = 0; i < smtp_ch_index; i++)
1778 {
acec9514 1779 g = string_append(g, 2, sep, smtp_names[smtp_connection_had[i]]);
b4ed4da0
PH
1780 sep = US",";
1781 }
1782
acec9514
JH
1783if (!(s = string_from_gstring(g))) s = US"";
1784
a2673768
JH
1785log_write(0, LOG_MAIN, "no MAIL in %sSMTP connection from %s D=%s%s",
1786 tcp_in_fastopen ? US"TFO " : US"",
0f1a8658 1787 host_and_ident(FALSE), string_timesince(&smtp_connection_start), s);
b4ed4da0
PH
1788}
1789
1790
a09f2942
JH
1791/* Return list of recent smtp commands */
1792
1793uschar *
1794smtp_cmd_hist(void)
1795{
acec9514
JH
1796int i;
1797gstring * list = NULL;
1798uschar * s;
a09f2942
JH
1799
1800for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++)
1801 if (smtp_connection_had[i] != SCH_NONE)
acec9514
JH
1802 list = string_append_listele(list, ',', smtp_names[smtp_connection_had[i]]);
1803
a09f2942 1804for (i = 0; i < smtp_ch_index; i++)
acec9514
JH
1805 list = string_append_listele(list, ',', smtp_names[smtp_connection_had[i]]);
1806
1807s = string_from_gstring(list);
1808return s ? s : US"";
a09f2942
JH
1809}
1810
1811
1812
b4ed4da0
PH
1813
1814/*************************************************
059ec3d9
PH
1815* Check HELO line and set sender_helo_name *
1816*************************************************/
1817
1818/* Check the format of a HELO line. The data for HELO/EHLO is supposed to be
1819the domain name of the sending host, or an ip literal in square brackets. The
4c04137d 1820argument is placed in sender_helo_name, which is in malloc store, because it
059ec3d9
PH
1821must persist over multiple incoming messages. If helo_accept_junk is set, this
1822host is permitted to send any old junk (needed for some broken hosts).
1823Otherwise, helo_allow_chars can be used for rogue characters in general
1824(typically people want to let in underscores).
1825
1826Argument:
1827 s the data portion of the line (already past any white space)
1828
1829Returns: TRUE or FALSE
1830*/
1831
1832static BOOL
1833check_helo(uschar *s)
1834{
1835uschar *start = s;
1836uschar *end = s + Ustrlen(s);
1837BOOL yield = helo_accept_junk;
1838
1839/* Discard any previous helo name */
1840
1841if (sender_helo_name != NULL)
1842 {
1843 store_free(sender_helo_name);
1844 sender_helo_name = NULL;
1845 }
1846
1847/* Skip tests if junk is permitted. */
1848
1849if (!yield)
1850 {
1851 /* Allow the new standard form for IPv6 address literals, namely,
1852 [IPv6:....], and because someone is bound to use it, allow an equivalent
1853 IPv4 form. Allow plain addresses as well. */
1854
1855 if (*s == '[')
1856 {
1857 if (end[-1] == ']')
1858 {
1859 end[-1] = 0;
1860 if (strncmpic(s, US"[IPv6:", 6) == 0)
1861 yield = (string_is_ip_address(s+6, NULL) == 6);
1862 else if (strncmpic(s, US"[IPv4:", 6) == 0)
1863 yield = (string_is_ip_address(s+6, NULL) == 4);
1864 else
1865 yield = (string_is_ip_address(s+1, NULL) != 0);
1866 end[-1] = ']';
1867 }
1868 }
1869
1870 /* Non-literals must be alpha, dot, hyphen, plus any non-valid chars
1871 that have been configured (usually underscore - sigh). */
1872
1873 else if (*s != 0)
1874 {
1875 yield = TRUE;
1876 while (*s != 0)
1877 {
1878 if (!isalnum(*s) && *s != '.' && *s != '-' &&
1879 Ustrchr(helo_allow_chars, *s) == NULL)
1880 {
1881 yield = FALSE;
1882 break;
1883 }
1884 s++;
1885 }
1886 }
1887 }
1888
1889/* Save argument if OK */
1890
1891if (yield) sender_helo_name = string_copy_malloc(start);
1892return yield;
1893}
1894
1895
1896
1897
1898
1899/*************************************************
1900* Extract SMTP command option *
1901*************************************************/
1902
ca86f471 1903/* This function picks the next option setting off the end of smtp_cmd_data. It
059ec3d9
PH
1904is called for MAIL FROM and RCPT TO commands, to pick off the optional ESMTP
1905things that can appear there.
1906
1907Arguments:
1908 name point this at the name
1909 value point this at the data string
1910
1911Returns: TRUE if found an option
1912*/
1913
1914static BOOL
1915extract_option(uschar **name, uschar **value)
1916{
1917uschar *n;
ca86f471 1918uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1;
059ec3d9
PH
1919while (isspace(*v)) v--;
1920v[1] = 0;
d7a2c833
JH
1921while (v > smtp_cmd_data && *v != '=' && !isspace(*v))
1922 {
1923 /* Take care to not stop at a space embedded in a quoted local-part */
1924
1925 if (*v == '"') do v--; while (*v != '"' && v > smtp_cmd_data+1);
1926 v--;
1927 }
059ec3d9
PH
1928
1929n = v;
fd98a5c6 1930if (*v == '=')
a2673768 1931 {
fd98a5c6
JH
1932 while(isalpha(n[-1])) n--;
1933 /* RFC says SP, but TAB seen in wild and other major MTAs accept it */
1934 if (!isspace(n[-1])) return FALSE;
1935 n[-1] = 0;
a2673768 1936 }
fd98a5c6 1937else
a2673768 1938 {
fd98a5c6
JH
1939 n++;
1940 if (v == smtp_cmd_data) return FALSE;
a2673768 1941 }
059ec3d9 1942*v++ = 0;
fd98a5c6 1943*name = n;
059ec3d9
PH
1944*value = v;
1945return TRUE;
1946}
1947
1948
1949
1950
1951
059ec3d9
PH
1952/*************************************************
1953* Reset for new message *
1954*************************************************/
1955
1956/* This function is called whenever the SMTP session is reset from
1957within either of the setup functions.
1958
1959Argument: the stacking pool storage reset point
1960Returns: nothing
1961*/
1962
1963static void
1964smtp_reset(void *reset_point)
1965{
059ec3d9
PH
1966recipients_list = NULL;
1967rcpt_count = rcpt_defer_count = rcpt_fail_count =
1968 raw_recipients_count = recipients_count = recipients_list_max = 0;
2e0c1448 1969message_linecount = 0;
059ec3d9 1970message_size = -1;
71fafd95 1971acl_added_headers = NULL;
e7568d51 1972acl_removed_headers = NULL;
059ec3d9 1973queue_only_policy = FALSE;
2679d413
PH
1974rcpt_smtp_response = NULL;
1975rcpt_smtp_response_same = TRUE;
1976rcpt_in_progress = FALSE;
69358f02 1977deliver_freeze = FALSE; /* Can be set by ACL */
6a3f1455 1978freeze_tell = freeze_tell_config; /* Can be set by ACL */
29aba418 1979fake_response = OK; /* Can be set by ACL */
6951ac6c 1980#ifdef WITH_CONTENT_SCAN
8523533c
TK
1981no_mbox_unspool = FALSE; /* Can be set by ACL */
1982#endif
69358f02 1983submission_mode = FALSE; /* Can be set by ACL */
f4ee74ac 1984suppress_local_fixups = suppress_local_fixups_default; /* Can be set by ACL */
69358f02
PH
1985active_local_from_check = local_from_check; /* Can be set by ACL */
1986active_local_sender_retain = local_sender_retain; /* Can be set by ACL */
90341c71
JH
1987sending_ip_address = NULL;
1988return_path = sender_address = NULL;
1989sender_data = NULL; /* Can be set by ACL */
1990deliver_localpart_orig = NULL;
1991deliver_domain_orig = NULL;
1992callout_address = NULL;
2fe1a124 1993submission_name = NULL; /* Can be set by ACL */
059ec3d9
PH
1994raw_sender = NULL; /* After SMTP rewrite, before qualifying */
1995sender_address_unrewritten = NULL; /* Set only after verify rewrite */
1996sender_verified_list = NULL; /* No senders verified */
1997memset(sender_address_cache, 0, sizeof(sender_address_cache));
1998memset(sender_domain_cache, 0, sizeof(sender_domain_cache));
6c1c3d1d 1999
059ec3d9 2000authenticated_sender = NULL;
8523533c
TK
2001#ifdef EXPERIMENTAL_BRIGHTMAIL
2002bmi_run = 0;
2003bmi_verdicts = NULL;
2004#endif
90341c71 2005dnslist_domain = dnslist_matched = NULL;
80a47a2c 2006#ifndef DISABLE_DKIM
9e5d6b55 2007dkim_signers = NULL;
80a47a2c
TK
2008dkim_disable_verify = FALSE;
2009dkim_collect_input = FALSE;
f7572e5a 2010#endif
aa368db3
JH
2011dsn_ret = 0;
2012dsn_envid = NULL;
90341c71 2013deliver_host = deliver_host_address = NULL; /* Can be set by ACL */
aa368db3
JH
2014#ifndef DISABLE_PRDR
2015prdr_requested = FALSE;
2016#endif
8523533c
TK
2017#ifdef EXPERIMENTAL_SPF
2018spf_header_comment = NULL;
2019spf_received = NULL;
8e669ac1 2020spf_result = NULL;
8523533c
TK
2021spf_smtp_comment = NULL;
2022#endif
8c5d388a 2023#ifdef SUPPORT_I18N
d1a13eea
JH
2024message_smtputf8 = FALSE;
2025#endif
059ec3d9
PH
2026body_linecount = body_zerocount = 0;
2027
870f6ba8
TF
2028sender_rate = sender_rate_limit = sender_rate_period = NULL;
2029ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */
2030 /* Note that ratelimiters_conn persists across resets. */
2031
38a0a95f 2032/* Reset message ACL variables */
47ca6d6c 2033
38a0a95f 2034acl_var_m = NULL;
059ec3d9
PH
2035
2036/* The message body variables use malloc store. They may be set if this is
2037not the first message in an SMTP session and the previous message caused them
2038to be referenced in an ACL. */
2039
90341c71 2040if (message_body)
059ec3d9
PH
2041 {
2042 store_free(message_body);
2043 message_body = NULL;
2044 }
2045
90341c71 2046if (message_body_end)
059ec3d9
PH
2047 {
2048 store_free(message_body_end);
2049 message_body_end = NULL;
2050 }
2051
2052/* Warning log messages are also saved in malloc store. They are saved to avoid
2053repetition in the same message, but it seems right to repeat them for different
4e88a19f 2054messages. */
059ec3d9 2055
90341c71 2056while (acl_warn_logged)
059ec3d9
PH
2057 {
2058 string_item *this = acl_warn_logged;
2059 acl_warn_logged = acl_warn_logged->next;
2060 store_free(this);
2061 }
90341c71 2062store_reset(reset_point);
059ec3d9
PH
2063}
2064
2065
2066
2067
2068
2069/*************************************************
2070* Initialize for incoming batched SMTP message *
2071*************************************************/
2072
2073/* This function is called from smtp_setup_msg() in the case when
2074smtp_batched_input is true. This happens when -bS is used to pass a whole batch
2075of messages in one file with SMTP commands between them. All errors must be
2076reported by sending a message, and only MAIL FROM, RCPT TO, and DATA are
2077relevant. After an error on a sender, or an invalid recipient, the remainder
2078of the message is skipped. The value of received_protocol is already set.
2079
2080Argument: none
2081Returns: > 0 message successfully started (reached DATA)
2082 = 0 QUIT read or end of file reached
2083 < 0 should not occur
2084*/
2085
2086static int
2087smtp_setup_batch_msg(void)
2088{
2089int done = 0;
2090void *reset_point = store_get(0);
2091
2092/* Save the line count at the start of each transaction - single commands
2093like HELO and RSET count as whole transactions. */
2094
2095bsmtp_transaction_linecount = receive_linecount;
2096
2097if ((receive_feof)()) return 0; /* Treat EOF as QUIT */
2098
57cc2785 2099cancel_cutthrough_connection(TRUE, US"smtp_setup_batch_msg");
059ec3d9
PH
2100smtp_reset(reset_point); /* Reset for start of message */
2101
2102/* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE
2103value. The values are 2 larger than the required yield of the function. */
2104
2105while (done <= 0)
2106 {
2107 uschar *errmess;
2108 uschar *recipient = NULL;
2109 int start, end, sender_domain, recipient_domain;
2110
bd8fbe36 2111 switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
059ec3d9
PH
2112 {
2113 /* The HELO/EHLO commands set sender_address_helo if they have
2114 valid data; otherwise they are ignored, except that they do
2115 a reset of the state. */
2116
2117 case HELO_CMD:
2118 case EHLO_CMD:
2119
ca86f471 2120 check_helo(smtp_cmd_data);
059ec3d9
PH
2121 /* Fall through */
2122
2123 case RSET_CMD:
57cc2785 2124 cancel_cutthrough_connection(TRUE, US"RSET received");
059ec3d9
PH
2125 smtp_reset(reset_point);
2126 bsmtp_transaction_linecount = receive_linecount;
2127 break;
2128
2129
2130 /* The MAIL FROM command requires an address as an operand. All we
2131 do here is to parse it for syntactic correctness. The form "<>" is
2132 a special case which converts into an empty string. The start/end
2133 pointers in the original are not used further for this address, as
2134 it is the canonical extracted address which is all that is kept. */
2135
2136 case MAIL_CMD:
474f71bf 2137 smtp_mailcmd_count++; /* Count for no-mail log */
059ec3d9
PH
2138 if (sender_address != NULL)
2139 /* The function moan_smtp_batch() does not return. */
3ee512ff 2140 moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given");
059ec3d9 2141
ca86f471 2142 if (smtp_cmd_data[0] == 0)
059ec3d9 2143 /* The function moan_smtp_batch() does not return. */
3ee512ff 2144 moan_smtp_batch(smtp_cmd_buffer, "501 MAIL FROM must have an address operand");
059ec3d9
PH
2145
2146 /* Reset to start of message */
2147
57cc2785 2148 cancel_cutthrough_connection(TRUE, US"MAIL received");
059ec3d9
PH
2149 smtp_reset(reset_point);
2150
2151 /* Apply SMTP rewrite */
2152
2153 raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)?
ca86f471
PH
2154 rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE,
2155 US"", global_rewrite_rules) : smtp_cmd_data;
059ec3d9
PH
2156
2157 /* Extract the address; the TRUE flag allows <> as valid */
2158
2159 raw_sender =
2160 parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain,
2161 TRUE);
2162
2163 if (raw_sender == NULL)
2164 /* The function moan_smtp_batch() does not return. */
3ee512ff 2165 moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess);
059ec3d9
PH
2166
2167 sender_address = string_copy(raw_sender);
2168
2169 /* Qualify unqualified sender addresses if permitted to do so. */
2170
2171 if (sender_domain == 0 && sender_address[0] != 0 && sender_address[0] != '@')
2172 {
2173 if (allow_unqualified_sender)
2174 {
2175 sender_address = rewrite_address_qualify(sender_address, FALSE);
2176 DEBUG(D_receive) debug_printf("unqualified address %s accepted "
2177 "and rewritten\n", raw_sender);
2178 }
2179 /* The function moan_smtp_batch() does not return. */
3ee512ff 2180 else moan_smtp_batch(smtp_cmd_buffer, "501 sender address must contain "
059ec3d9
PH
2181 "a domain");
2182 }
2183 break;
2184
2185
2186 /* The RCPT TO command requires an address as an operand. All we do
2187 here is to parse it for syntactic correctness. There may be any number
2188 of RCPT TO commands, specifying multiple senders. We build them all into
2189 a data structure that is in argc/argv format. The start/end values
2190 given by parse_extract_address are not used, as we keep only the
2191 extracted address. */
2192
2193 case RCPT_CMD:
2194 if (sender_address == NULL)
2195 /* The function moan_smtp_batch() does not return. */
3ee512ff 2196 moan_smtp_batch(smtp_cmd_buffer, "503 No sender yet given");
059ec3d9 2197
ca86f471 2198 if (smtp_cmd_data[0] == 0)
059ec3d9 2199 /* The function moan_smtp_batch() does not return. */
3ee512ff 2200 moan_smtp_batch(smtp_cmd_buffer, "501 RCPT TO must have an address operand");
059ec3d9
PH
2201
2202 /* Check maximum number allowed */
2203
2204 if (recipients_max > 0 && recipients_count + 1 > recipients_max)
2205 /* The function moan_smtp_batch() does not return. */
3ee512ff 2206 moan_smtp_batch(smtp_cmd_buffer, "%s too many recipients",
059ec3d9
PH
2207 recipients_max_reject? "552": "452");
2208
2209 /* Apply SMTP rewrite, then extract address. Don't allow "<>" as a
2210 recipient address */
2211
2685d6e0
JH
2212 recipient = rewrite_existflags & rewrite_smtp
2213 ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
2214 global_rewrite_rules)
2215 : smtp_cmd_data;
059ec3d9 2216
059ec3d9
PH
2217 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2218 &recipient_domain, FALSE);
059ec3d9 2219
2685d6e0 2220 if (!recipient)
059ec3d9 2221 /* The function moan_smtp_batch() does not return. */
3ee512ff 2222 moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess);
059ec3d9
PH
2223
2224 /* If the recipient address is unqualified, qualify it if permitted. Then
2225 add it to the list of recipients. */
2226
2227 if (recipient_domain == 0)
2228 {
2229 if (allow_unqualified_recipient)
2230 {
2231 DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
2232 recipient);
2233 recipient = rewrite_address_qualify(recipient, TRUE);
2234 }
2235 /* The function moan_smtp_batch() does not return. */
3ee512ff 2236 else moan_smtp_batch(smtp_cmd_buffer, "501 recipient address must contain "
059ec3d9
PH
2237 "a domain");
2238 }
2239 receive_add_recipient(recipient, -1);
2240 break;
2241
2242
2243 /* The DATA command is legal only if it follows successful MAIL FROM
2244 and RCPT TO commands. This function is complete when a valid DATA
2245 command is encountered. */
2246
2247 case DATA_CMD:
2248 if (sender_address == NULL || recipients_count <= 0)
2249 {
2250 /* The function moan_smtp_batch() does not return. */
2251 if (sender_address == NULL)
3ee512ff 2252 moan_smtp_batch(smtp_cmd_buffer,
059ec3d9
PH
2253 "503 MAIL FROM:<sender> command must precede DATA");
2254 else
3ee512ff 2255 moan_smtp_batch(smtp_cmd_buffer,
059ec3d9
PH
2256 "503 RCPT TO:<recipient> must precede DATA");
2257 }
2258 else
2259 {
2260 done = 3; /* DATA successfully achieved */
2261 message_ended = END_NOTENDED; /* Indicate in middle of message */
2262 }
2263 break;
2264
2265
2266 /* The VRFY, EXPN, HELP, ETRN, and NOOP commands are ignored. */
2267
2268 case VRFY_CMD:
2269 case EXPN_CMD:
2270 case HELP_CMD:
2271 case NOOP_CMD:
2272 case ETRN_CMD:
2273 bsmtp_transaction_linecount = receive_linecount;
2274 break;
2275
2276
2277 case EOF_CMD:
2278 case QUIT_CMD:
2279 done = 2;
2280 break;
2281
2282
2283 case BADARG_CMD:
2284 /* The function moan_smtp_batch() does not return. */
3ee512ff 2285 moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected argument data");
059ec3d9
PH
2286 break;
2287
2288
2289 case BADCHAR_CMD:
2290 /* The function moan_smtp_batch() does not return. */
3ee512ff 2291 moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected NULL in SMTP command");
059ec3d9
PH
2292 break;
2293
2294
2295 default:
2296 /* The function moan_smtp_batch() does not return. */
3ee512ff 2297 moan_smtp_batch(smtp_cmd_buffer, "500 Command unrecognized");
059ec3d9
PH
2298 break;
2299 }
2300 }
2301
2302return done - 2; /* Convert yield values */
2303}
2304
2305
2306
2307
cf0c6164
JH
2308static BOOL
2309smtp_log_tls_fail(uschar * errstr)
2310{
2311uschar * conn_info = smtp_get_connection_info();
2312
2313if (Ustrncmp(conn_info, US"SMTP ", 5) == 0) conn_info += 5;
2314/* I'd like to get separated H= here, but too hard for now */
2315
2316log_write(0, LOG_MAIN, "TLS error on %s %s", conn_info, errstr);
2317return FALSE;
2318}
2319
2320
a2673768
JH
2321
2322
2323#ifdef TCP_FASTOPEN
2324static void
2325tfo_in_check(void)
2326{
2327# ifdef TCP_INFO
2328struct tcp_info tinfo;
2329socklen_t len = sizeof(tinfo);
2330
2331if ( getsockopt(fileno(smtp_out), IPPROTO_TCP, TCP_INFO, &tinfo, &len) == 0
2332 && tinfo.tcpi_state == TCP_SYN_RECV
2333 )
2334 {
1ccd5f67 2335 DEBUG(D_receive) debug_printf("TCP_FASTOPEN mode connection (state TCP_SYN_RECV)\n");
a2673768
JH
2336 tcp_in_fastopen = TRUE;
2337 }
2338# endif
2339}
2340#endif
2341
2342
059ec3d9
PH
2343/*************************************************
2344* Start an SMTP session *
2345*************************************************/
2346
2347/* This function is called at the start of an SMTP session. Thereafter,
2348smtp_setup_msg() is called to initiate each separate message. This
2349function does host-specific testing, and outputs the banner line.
2350
2351Arguments: none
2352Returns: FALSE if the session can not continue; something has
2353 gone wrong, or the connection to the host is blocked
2354*/
2355
2356BOOL
2357smtp_start_session(void)
2358{
acec9514 2359int esclen;
4e88a19f
PH
2360uschar *user_msg, *log_msg;
2361uschar *code, *esc;
acec9514
JH
2362uschar *p, *s;
2363gstring * ss;
059ec3d9 2364
0f1a8658 2365gettimeofday(&smtp_connection_start, NULL);
b4ed4da0
PH
2366for (smtp_ch_index = 0; smtp_ch_index < SMTP_HBUFF_SIZE; smtp_ch_index++)
2367 smtp_connection_had[smtp_ch_index] = SCH_NONE;
2368smtp_ch_index = 0;
2369
00f00ca5
PH
2370/* Default values for certain variables */
2371
059ec3d9 2372helo_seen = esmtp = helo_accept_junk = FALSE;
b4ed4da0 2373smtp_mailcmd_count = 0;
059ec3d9
PH
2374count_nonmail = TRUE_UNSET;
2375synprot_error_count = unknown_command_count = nonmail_command_count = 0;
2376smtp_delay_mail = smtp_rlm_base;
2377auth_advertised = FALSE;
2378pipelining_advertised = FALSE;
cf8b11a5 2379pipelining_enable = TRUE;
059ec3d9 2380sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING;
8f128379 2381smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */
059ec3d9 2382
33d73e3b
PH
2383/* If receiving by -bs from a trusted user, or testing with -bh, we allow
2384authentication settings from -oMaa to remain in force. */
2385
2386if (!host_checking && !sender_host_notsocket) sender_host_authenticated = NULL;
059ec3d9
PH
2387authenticated_by = NULL;
2388
2389#ifdef SUPPORT_TLS
817d9f57 2390tls_in.cipher = tls_in.peerdn = NULL;
9d1c15ef
JH
2391tls_in.ourcert = tls_in.peercert = NULL;
2392tls_in.sni = NULL;
44662487 2393tls_in.ocsp = OCSP_NOT_REQ;
059ec3d9
PH
2394tls_advertised = FALSE;
2395#endif
6c1c3d1d 2396dsn_advertised = FALSE;
8c5d388a 2397#ifdef SUPPORT_I18N
d1a13eea
JH
2398smtputf8_advertised = FALSE;
2399#endif
059ec3d9
PH
2400
2401/* Reset ACL connection variables */
2402
38a0a95f 2403acl_var_c = NULL;
059ec3d9 2404
ca86f471 2405/* Allow for trailing 0 in the command and data buffers. */
3ee512ff 2406
bd8fbe36 2407if (!(smtp_cmd_buffer = US malloc(2*SMTP_CMD_BUFFER_SIZE + 2)))
059ec3d9
PH
2408 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2409 "malloc() failed for SMTP command buffer");
40c90bca 2410
2416c261 2411smtp_cmd_buffer[0] = 0;
bd8fbe36 2412smtp_data_buffer = smtp_cmd_buffer + SMTP_CMD_BUFFER_SIZE + 1;
059ec3d9
PH
2413
2414/* For batched input, the protocol setting can be overridden from the
2415command line by a trusted caller. */
2416
2417if (smtp_batched_input)
2418 {
40c90bca 2419 if (!received_protocol) received_protocol = US"local-bsmtp";
059ec3d9
PH
2420 }
2421
2422/* For non-batched SMTP input, the protocol setting is forced here. It will be
2423reset later if any of EHLO/AUTH/STARTTLS are received. */
2424
2425else
2426 received_protocol =
e524074d 2427 (sender_host_address ? protocols : protocols_local) [pnormal];
059ec3d9
PH
2428
2429/* Set up the buffer for inputting using direct read() calls, and arrange to
2430call the local functions instead of the standard C ones. */
2431
5903c6ff 2432if (!(smtp_inbuffer = US malloc(IN_BUFFER_SIZE)))
059ec3d9 2433 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer");
40c90bca 2434
059ec3d9 2435receive_getc = smtp_getc;
0d81dabc 2436receive_getbuf = smtp_getbuf;
584e96c6 2437receive_get_cache = smtp_get_cache;
059ec3d9
PH
2438receive_ungetc = smtp_ungetc;
2439receive_feof = smtp_feof;
2440receive_ferror = smtp_ferror;
58eb016e 2441receive_smtp_buffered = smtp_buffered;
059ec3d9
PH
2442smtp_inptr = smtp_inend = smtp_inbuffer;
2443smtp_had_eof = smtp_had_error = 0;
2444
2445/* Set up the message size limit; this may be host-specific */
2446
d45b1de8
PH
2447thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
2448if (expand_string_message != NULL)
059ec3d9
PH
2449 {
2450 if (thismessage_size_limit == -1)
2451 log_write(0, LOG_MAIN|LOG_PANIC, "unable to expand message_size_limit: "
2452 "%s", expand_string_message);
2453 else
2454 log_write(0, LOG_MAIN|LOG_PANIC, "invalid message_size_limit: "
2455 "%s", expand_string_message);
2456 smtp_closedown(US"Temporary local problem - please try later");
2457 return FALSE;
2458 }
2459
2460/* When a message is input locally via the -bs or -bS options, sender_host_
2461unknown is set unless -oMa was used to force an IP address, in which case it
2462is checked like a real remote connection. When -bs is used from inetd, this
2463flag is not set, causing the sending host to be checked. The code that deals
2464with IP source routing (if configured) is never required for -bs or -bS and
2465the flag sender_host_notsocket is used to suppress it.
2466
2467If smtp_accept_max and smtp_accept_reserve are set, keep some connections in
2468reserve for certain hosts and/or networks. */
2469
2470if (!sender_host_unknown)
2471 {
2472 int rc;
2473 BOOL reserved_host = FALSE;
2474
2475 /* Look up IP options (source routing info) on the socket if this is not an
2476 -oMa "host", and if any are found, log them and drop the connection.
2477
2478 Linux (and others now, see below) is different to everyone else, so there
2479 has to be some conditional compilation here. Versions of Linux before 2.1.15
2480 used a structure whose name was "options". Somebody finally realized that
2481 this name was silly, and it got changed to "ip_options". I use the
2482 newer name here, but there is a fudge in the script that sets up os.h
2483 to define a macro in older Linux systems.
2484
2485 Sigh. Linux is a fast-moving target. Another generation of Linux uses
2486 glibc 2, which has chosen ip_opts for the structure name. This is now
2487 really a glibc thing rather than a Linux thing, so the condition name
2488 has been changed to reflect this. It is relevant also to GNU/Hurd.
2489
2490 Mac OS 10.x (Darwin) is like the later glibc versions, but without the
2491 setting of the __GLIBC__ macro, so we can't detect it automatically. There's
2492 a special macro defined in the os.h file.
2493
2494 Some DGUX versions on older hardware appear not to support IP options at
2495 all, so there is now a general macro which can be set to cut out this
2496 support altogether.
2497
2498 How to do this properly in IPv6 is not yet known. */
2499
2500 #if !HAVE_IPV6 && !defined(NO_IP_OPTIONS)
2501
2502 #ifdef GLIBC_IP_OPTIONS
2503 #if (!defined __GLIBC__) || (__GLIBC__ < 2)
2504 #define OPTSTYLE 1
2505 #else
2506 #define OPTSTYLE 2
2507 #endif
2508 #elif defined DARWIN_IP_OPTIONS
2509 #define OPTSTYLE 2
2510 #else
2511 #define OPTSTYLE 3
2512 #endif
2513
2514 if (!host_checking && !sender_host_notsocket)
2515 {
2516 #if OPTSTYLE == 1
36a3b041 2517 EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN;
059ec3d9
PH
2518 struct ip_options *ipopt = store_get(optlen);
2519 #elif OPTSTYLE == 2
2520 struct ip_opts ipoptblock;
2521 struct ip_opts *ipopt = &ipoptblock;
36a3b041 2522 EXIM_SOCKLEN_T optlen = sizeof(ipoptblock);
059ec3d9
PH
2523 #else
2524 struct ipoption ipoptblock;
2525 struct ipoption *ipopt = &ipoptblock;
36a3b041 2526 EXIM_SOCKLEN_T optlen = sizeof(ipoptblock);
059ec3d9
PH
2527 #endif
2528
2529 /* Occasional genuine failures of getsockopt() have been seen - for
2530 example, "reset by peer". Therefore, just log and give up on this
2531 call, unless the error is ENOPROTOOPT. This error is given by systems
2532 that have the interfaces but not the mechanism - e.g. GNU/Hurd at the time
2533 of writing. So for that error, carry on - we just can't do an IP options
2534 check. */
2535
2536 DEBUG(D_receive) debug_printf("checking for IP options\n");
2537
5903c6ff 2538 if (getsockopt(fileno(smtp_out), IPPROTO_IP, IP_OPTIONS, US (ipopt),
059ec3d9
PH
2539 &optlen) < 0)
2540 {
2541 if (errno != ENOPROTOOPT)
2542 {
2543 log_write(0, LOG_MAIN, "getsockopt() failed from %s: %s",
2544 host_and_ident(FALSE), strerror(errno));
925ac8e4 2545 smtp_printf("451 SMTP service not available\r\n", FALSE);
059ec3d9
PH
2546 return FALSE;
2547 }
2548 }
2549
2550 /* Deal with any IP options that are set. On the systems I have looked at,
2551 the value of MAX_IPOPTLEN has been 40, meaning that there should never be
2552 more logging data than will fit in big_buffer. Nevertheless, after somebody
2553 questioned this code, I've added in some paranoid checking. */
2554
2555 else if (optlen > 0)
2556 {
2557 uschar *p = big_buffer;
2558 uschar *pend = big_buffer + big_buffer_size;
2559 uschar *opt, *adptr;
2560 int optcount;
2561 struct in_addr addr;
2562
2563 #if OPTSTYLE == 1
5903c6ff 2564 uschar *optstart = US (ipopt->__data);
059ec3d9 2565 #elif OPTSTYLE == 2
5903c6ff 2566 uschar *optstart = US (ipopt->ip_opts);
059ec3d9 2567 #else
5903c6ff 2568 uschar *optstart = US (ipopt->ipopt_list);
059ec3d9
PH
2569 #endif
2570
2571 DEBUG(D_receive) debug_printf("IP options exist\n");
2572
2573 Ustrcpy(p, "IP options on incoming call:");
2574 p += Ustrlen(p);
2575
2576 for (opt = optstart; opt != NULL &&
5903c6ff 2577 opt < US (ipopt) + optlen;)
059ec3d9
PH
2578 {
2579 switch (*opt)
2580 {
2581 case IPOPT_EOL:
2582 opt = NULL;
2583 break;
2584
2585 case IPOPT_NOP:
2586 opt++;
2587 break;
2588
2589 case IPOPT_SSRR:
2590 case IPOPT_LSRR:
2591 if (!string_format(p, pend-p, " %s [@%s",
2592 (*opt == IPOPT_SSRR)? "SSRR" : "LSRR",
2593 #if OPTSTYLE == 1
2594 inet_ntoa(*((struct in_addr *)(&(ipopt->faddr))))))
2595 #elif OPTSTYLE == 2
2596 inet_ntoa(ipopt->ip_dst)))
2597 #else
2598 inet_ntoa(ipopt->ipopt_dst)))
2599 #endif
2600 {
2601 opt = NULL;
2602 break;
2603 }
2604
2605 p += Ustrlen(p);
2606 optcount = (opt[1] - 3) / sizeof(struct in_addr);
2607 adptr = opt + 3;
2608 while (optcount-- > 0)
2609 {
2610 memcpy(&addr, adptr, sizeof(addr));
2611 if (!string_format(p, pend - p - 1, "%s%s",
2612 (optcount == 0)? ":" : "@", inet_ntoa(addr)))
2613 {
2614 opt = NULL;
2615 break;
2616 }
2617 p += Ustrlen(p);
2618 adptr += sizeof(struct in_addr);
2619 }
2620 *p++ = ']';
2621 opt += opt[1];
2622 break;
2623
2624 default:
2625 {
2626 int i;
2627 if (pend - p < 4 + 3*opt[1]) { opt = NULL; break; }
2628 Ustrcat(p, "[ ");
2629 p += 2;
2630 for (i = 0; i < opt[1]; i++)
5976eb99 2631 p += sprintf(CS p, "%2.2x ", opt[i]);
059ec3d9
PH
2632 *p++ = ']';
2633 }
2634 opt += opt[1];
2635 break;
2636 }
2637 }
2638
2639 *p = 0;
2640 log_write(0, LOG_MAIN, "%s", big_buffer);
2641
2642 /* Refuse any call with IP options. This is what tcpwrappers 7.5 does. */
2643
2644 log_write(0, LOG_MAIN|LOG_REJECT,
2645 "connection from %s refused (IP options)", host_and_ident(FALSE));
2646
925ac8e4 2647 smtp_printf("554 SMTP service not available\r\n", FALSE);
059ec3d9
PH
2648 return FALSE;
2649 }
2650
2651 /* Length of options = 0 => there are no options */
2652
2653 else DEBUG(D_receive) debug_printf("no IP options found\n");
2654 }
2655 #endif /* HAVE_IPV6 && !defined(NO_IP_OPTIONS) */
2656
2657 /* Set keep-alive in socket options. The option is on by default. This
2658 setting is an attempt to get rid of some hanging connections that stick in
2659 read() when the remote end (usually a dialup) goes away. */
2660
2661 if (smtp_accept_keepalive && !sender_host_notsocket)
2662 ip_keepalive(fileno(smtp_out), sender_host_address, FALSE);
2663
2664 /* If the current host matches host_lookup, set the name by doing a
2665 reverse lookup. On failure, sender_host_name will be NULL and
2666 host_lookup_failed will be TRUE. This may or may not be serious - optional
2667 checks later. */
2668
2669 if (verify_check_host(&host_lookup) == OK)
2670 {
2671 (void)host_name_lookup();
2672 host_build_sender_fullhost();
2673 }
2674
2675 /* Delay this until we have the full name, if it is looked up. */
2676
2677 set_process_info("handling incoming connection from %s",
2678 host_and_ident(FALSE));
2679
1ad6489e
JH
2680 /* Expand smtp_receive_timeout, if needed */
2681
2682 if (smtp_receive_timeout_s)
2683 {
2684 uschar * exp;
2685 if ( !(exp = expand_string(smtp_receive_timeout_s))
2686 || !(*exp)
2687 || (smtp_receive_timeout = readconf_readtime(exp, 0, FALSE)) < 0
2688 )
2689 log_write(0, LOG_MAIN|LOG_PANIC,
2690 "bad value for smtp_receive_timeout: '%s'", exp ? exp : US"");
2691 }
2692
059ec3d9
PH
2693 /* Test for explicit connection rejection */
2694
2695 if (verify_check_host(&host_reject_connection) == OK)
2696 {
2697 log_write(L_connection_reject, LOG_MAIN|LOG_REJECT, "refused connection "
2698 "from %s (host_reject_connection)", host_and_ident(FALSE));
925ac8e4 2699 smtp_printf("554 SMTP service not available\r\n", FALSE);
059ec3d9
PH
2700 return FALSE;
2701 }
2702
afb3eaaf
PH
2703 /* Test with TCP Wrappers if so configured. There is a problem in that
2704 hosts_ctl() returns 0 (deny) under a number of system failure circumstances,
2705 such as disks dying. In these cases, it is desirable to reject with a 4xx
2706 error instead of a 5xx error. There isn't a "right" way to detect such
2707 problems. The following kludge is used: errno is zeroed before calling
2708 hosts_ctl(). If the result is "reject", a 5xx error is given only if the
2709 value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does
2710 not exist). */
059ec3d9 2711
1811cb4c 2712#ifdef USE_TCP_WRAPPERS
afb3eaaf 2713 errno = 0;
1811cb4c 2714 if (!(tcp_wrappers_name = expand_string(tcp_wrappers_daemon_name)))
5dc43717
JJ
2715 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2716 "(tcp_wrappers_name) failed: %s", string_printing(tcp_wrappers_name),
2717 expand_string_message);
1811cb4c 2718
5dc43717 2719 if (!hosts_ctl(tcp_wrappers_name,
1811cb4c
JH
2720 sender_host_name ? CS sender_host_name : STRING_UNKNOWN,
2721 sender_host_address ? CS sender_host_address : STRING_UNKNOWN,
2722 sender_ident ? CS sender_ident : STRING_UNKNOWN))
059ec3d9 2723 {
afb3eaaf
PH
2724 if (errno == 0 || errno == ENOENT)
2725 {
2726 HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n");
2727 log_write(L_connection_reject,
2728 LOG_MAIN|LOG_REJECT, "refused connection from %s "
2729 "(tcp wrappers)", host_and_ident(FALSE));
925ac8e4 2730 smtp_printf("554 SMTP service not available\r\n", FALSE);
afb3eaaf
PH
2731 }
2732 else
2733 {
2734 int save_errno = errno;
2735 HDEBUG(D_receive) debug_printf("tcp wrappers rejected with unexpected "
2736 "errno value %d\n", save_errno);
2737 log_write(L_connection_reject,
2738 LOG_MAIN|LOG_REJECT, "temporarily refused connection from %s "
2739 "(tcp wrappers errno=%d)", host_and_ident(FALSE), save_errno);
925ac8e4 2740 smtp_printf("451 Temporary local problem - please try later\r\n", FALSE);
afb3eaaf 2741 }
059ec3d9
PH
2742 return FALSE;
2743 }
1811cb4c 2744#endif
059ec3d9 2745
b01dd148
PH
2746 /* Check for reserved slots. The value of smtp_accept_count has already been
2747 incremented to include this process. */
059ec3d9
PH
2748
2749 if (smtp_accept_max > 0 &&
b01dd148 2750 smtp_accept_count > smtp_accept_max - smtp_accept_reserve)
059ec3d9
PH
2751 {
2752 if ((rc = verify_check_host(&smtp_reserve_hosts)) != OK)
2753 {
2754 log_write(L_connection_reject,
2755 LOG_MAIN, "temporarily refused connection from %s: not in "
2756 "reserve list: connected=%d max=%d reserve=%d%s",
b01dd148 2757 host_and_ident(FALSE), smtp_accept_count - 1, smtp_accept_max,
059ec3d9
PH
2758 smtp_accept_reserve, (rc == DEFER)? " (lookup deferred)" : "");
2759 smtp_printf("421 %s: Too many concurrent SMTP connections; "
925ac8e4 2760 "please try again later\r\n", FALSE, smtp_active_hostname);
059ec3d9
PH
2761 return FALSE;
2762 }
2763 reserved_host = TRUE;
2764 }
2765
2766 /* If a load level above which only messages from reserved hosts are
2767 accepted is set, check the load. For incoming calls via the daemon, the
2768 check is done in the superior process if there are no reserved hosts, to
2769 save a fork. In all cases, the load average will already be available
2770 in a global variable at this point. */
2771
2772 if (smtp_load_reserve >= 0 &&
2773 load_average > smtp_load_reserve &&
2774 !reserved_host &&
2775 verify_check_host(&smtp_reserve_hosts) != OK)
2776 {
2777 log_write(L_connection_reject,
2778 LOG_MAIN, "temporarily refused connection from %s: not in "
2779 "reserve list and load average = %.2f", host_and_ident(FALSE),
2780 (double)load_average/1000.0);
925ac8e4 2781 smtp_printf("421 %s: Too much load; please try again later\r\n", FALSE,
059ec3d9
PH
2782 smtp_active_hostname);
2783 return FALSE;
2784 }
2785
2786 /* Determine whether unqualified senders or recipients are permitted
2787 for this host. Unfortunately, we have to do this every time, in order to
2788 set the flags so that they can be inspected when considering qualifying
2789 addresses in the headers. For a site that permits no qualification, this
2790 won't take long, however. */
2791
2792 allow_unqualified_sender =
2793 verify_check_host(&sender_unqualified_hosts) == OK;
2794
2795 allow_unqualified_recipient =
2796 verify_check_host(&recipient_unqualified_hosts) == OK;
2797
2798 /* Determine whether HELO/EHLO is required for this host. The requirement
2799 can be hard or soft. */
2800
2801 helo_required = verify_check_host(&helo_verify_hosts) == OK;
2802 if (!helo_required)
2803 helo_verify = verify_check_host(&helo_try_verify_hosts) == OK;
2804
2805 /* Determine whether this hosts is permitted to send syntactic junk
2806 after a HELO or EHLO command. */
2807
2808 helo_accept_junk = verify_check_host(&helo_accept_junk_hosts) == OK;
2809 }
2810
2811/* For batch SMTP input we are now done. */
2812
2813if (smtp_batched_input) return TRUE;
2814
a3c86431
TL
2815/* If valid Proxy Protocol source is connecting, set up session.
2816 * Failure will not allow any SMTP function other than QUIT. */
1811cb4c
JH
2817
2818#ifdef SUPPORT_PROXY
a3c86431
TL
2819proxy_session = FALSE;
2820proxy_session_failed = FALSE;
2821if (check_proxy_protocol_host())
1811cb4c
JH
2822 setup_proxy_protocol_host();
2823#endif
2824
2825 /* Start up TLS if tls_on_connect is set. This is for supporting the legacy
2826 smtps port for use with older style SSL MTAs. */
2827
2828#ifdef SUPPORT_TLS
69d8eed7
JH
2829 if (tls_in.on_connect)
2830 {
2831 if (tls_server_start(tls_require_ciphers, &user_msg) != OK)
2832 return smtp_log_tls_fail(user_msg);
2833 cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE;
2834 }
a3c86431
TL
2835#endif
2836
1811cb4c 2837/* Run the connect ACL if it exists */
059ec3d9 2838
4e88a19f 2839user_msg = NULL;
3cc3f762 2840if (acl_smtp_connect)
059ec3d9
PH
2841 {
2842 int rc;
3cc3f762
JH
2843 if ((rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg,
2844 &log_msg)) != OK)
059ec3d9 2845 {
3cc3f762 2846 (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg);
059ec3d9
PH
2847 return FALSE;
2848 }
2849 }
2850
2851/* Output the initial message for a two-way SMTP connection. It may contain
2852newlines, which then cause a multi-line response to be given. */
2853
4e88a19f
PH
2854code = US"220"; /* Default status code */
2855esc = US""; /* Default extended status code */
2856esclen = 0; /* Length of esc */
2857
d4ff61d1 2858if (!user_msg)
4e88a19f 2859 {
d4ff61d1 2860 if (!(s = expand_string(smtp_banner)))
4e88a19f
PH
2861 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) "
2862 "failed: %s", smtp_banner, expand_string_message);
2863 }
2864else
2865 {
2866 int codelen = 3;
2867 s = user_msg;
4f6ae5c3 2868 smtp_message_code(&code, &codelen, &s, NULL, TRUE);
d6a96edc 2869 if (codelen > 4)
4e88a19f
PH
2870 {
2871 esc = code + 4;
2872 esclen = codelen - 4;
2873 }
2874 }
059ec3d9
PH
2875
2876/* Remove any terminating newlines; might as well remove trailing space too */
2877
2878p = s + Ustrlen(s);
2879while (p > s && isspace(p[-1])) p--;
2880*p = 0;
2881
2882/* It seems that CC:Mail is braindead, and assumes that the greeting message
2883is all contained in a single IP packet. The original code wrote out the
2884greeting using several calls to fprint/fputc, and on busy servers this could
2885cause it to be split over more than one packet - which caused CC:Mail to fall
2886over when it got the second part of the greeting after sending its first
2887command. Sigh. To try to avoid this, build the complete greeting message
2888first, and output it in one fell swoop. This gives a better chance of it
2889ending up as a single packet. */
2890
acec9514 2891ss = string_get(256);
059ec3d9
PH
2892
2893p = s;
2894do /* At least once, in case we have an empty string */
2895 {
2896 int len;
2897 uschar *linebreak = Ustrchr(p, '\n');
acec9514 2898 ss = string_catn(ss, code, 3);
059ec3d9
PH
2899 if (linebreak == NULL)
2900 {
2901 len = Ustrlen(p);
acec9514 2902 ss = string_catn(ss, US" ", 1);
059ec3d9
PH
2903 }
2904 else
2905 {
2906 len = linebreak - p;
acec9514 2907 ss = string_catn(ss, US"-", 1);
059ec3d9 2908 }
acec9514
JH
2909 ss = string_catn(ss, esc, esclen);
2910 ss = string_catn(ss, p, len);
2911 ss = string_catn(ss, US"\r\n", 2);
059ec3d9
PH
2912 p += len;
2913 if (linebreak != NULL) p++;
2914 }
2915while (*p != 0);
2916
059ec3d9
PH
2917/* Before we write the banner, check that there is no input pending, unless
2918this synchronisation check is disabled. */
2919
a14e5636 2920if (!check_sync())
059ec3d9 2921 {
40525d07
JH
2922 unsigned n = smtp_inend - smtp_inptr;
2923 if (n > 32) n = 32;
2924
a14e5636
PH
2925 log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol "
2926 "synchronization error (input sent without waiting for greeting): "
2927 "rejected connection from %s input=\"%s\"", host_and_ident(TRUE),
40525d07 2928 string_printing(string_copyn(smtp_inptr, n)));
925ac8e4 2929 smtp_printf("554 SMTP synchronization error\r\n", FALSE);
a14e5636 2930 return FALSE;
059ec3d9
PH
2931 }
2932
2933/* Now output the banner */
2934
acec9514 2935smtp_printf("%s", FALSE, string_from_gstring(ss));
a2673768
JH
2936
2937/* Attempt to see if we sent the banner before the last ACK of the 3-way
2938handshake arrived. If so we must have managed a TFO. */
2939
2940#ifdef TCP_FASTOPEN
2941tfo_in_check();
2942#endif
2943
059ec3d9
PH
2944return TRUE;
2945}
2946
2947
2948
2949
2950
2951/*************************************************
2952* Handle SMTP syntax and protocol errors *
2953*************************************************/
2954
2955/* Write to the log for SMTP syntax errors in incoming commands, if configured
2956to do so. Then transmit the error response. The return value depends on the
2957number of syntax and protocol errors in this SMTP session.
2958
2959Arguments:
2960 type error type, given as a log flag bit
2961 code response code; <= 0 means don't send a response
2962 data data to reflect in the response (can be NULL)
2963 errmess the error message
2964
2965Returns: -1 limit of syntax/protocol errors NOT exceeded
2966 +1 limit of syntax/protocol errors IS exceeded
2967
2968These values fit in with the values of the "done" variable in the main
2969processing loop in smtp_setup_msg(). */
2970
2971static int
2972synprot_error(int type, int code, uschar *data, uschar *errmess)
2973{
2974int yield = -1;
2975
2976log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s",
2977 (type == L_smtp_syntax_error)? "syntax" : "protocol",
3ee512ff 2978 string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess);
059ec3d9
PH
2979
2980if (++synprot_error_count > smtp_max_synprot_errors)
2981 {
2982 yield = 1;
2983 log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
2984 "syntax or protocol errors (last command was \"%s\")",
0ebc4d69 2985 host_and_ident(FALSE), string_printing(smtp_cmd_buffer));
059ec3d9
PH
2986 }
2987
2988if (code > 0)
2989 {
925ac8e4
JH
2990 smtp_printf("%d%c%s%s%s\r\n", FALSE, code, yield == 1 ? '-' : ' ',
2991 data ? data : US"", data ? US": " : US"", errmess);
059ec3d9 2992 if (yield == 1)
925ac8e4 2993 smtp_printf("%d Too many syntax or protocol errors\r\n", FALSE, code);
059ec3d9
PH
2994 }
2995
2996return yield;
2997}
2998
2999
3000
3001
3002/*************************************************
059ec3d9
PH
3003* Send SMTP response, possibly multiline *
3004*************************************************/
3005
3006/* There are, it seems, broken clients out there that cannot handle multiline
3007responses. If no_multiline_responses is TRUE (it can be set from an ACL), we
3008output nothing for non-final calls, and only the first line for anything else.
3009
3010Arguments:
a5bd321b 3011 code SMTP code, may involve extended status codes
d6a96edc 3012 codelen length of smtp code; if > 4 there's an ESC
059ec3d9
PH
3013 final FALSE if the last line isn't the final line
3014 msg message text, possibly containing newlines
3015
3016Returns: nothing
3017*/
3018
3019void
a5bd321b 3020smtp_respond(uschar* code, int codelen, BOOL final, uschar *msg)
059ec3d9 3021{
a5bd321b
PH
3022int esclen = 0;
3023uschar *esc = US"";
3024
059ec3d9
PH
3025if (!final && no_multiline_responses) return;
3026
d6a96edc 3027if (codelen > 4)
a5bd321b
PH
3028 {
3029 esc = code + 4;
3030 esclen = codelen - 4;
3031 }
3032
2679d413
PH
3033/* If this is the first output for a (non-batch) RCPT command, see if all RCPTs
3034have had the same. Note: this code is also present in smtp_printf(). It would
3035be tidier to have it only in one place, but when it was added, it was easier to
3036do it that way, so as not to have to mess with the code for the RCPT command,
3037which sometimes uses smtp_printf() and sometimes smtp_respond(). */
3038
3039if (rcpt_in_progress)
3040 {
3041 if (rcpt_smtp_response == NULL)
3042 rcpt_smtp_response = string_copy(msg);
3043 else if (rcpt_smtp_response_same &&
3044 Ustrcmp(rcpt_smtp_response, msg) != 0)
3045 rcpt_smtp_response_same = FALSE;
3046 rcpt_in_progress = FALSE;
3047 }
3048
e5de01f0 3049/* Now output the message, splitting it up into multiple lines if necessary.
925ac8e4
JH
3050We only handle pipelining these responses as far as nonfinal/final groups,
3051not the whole MAIL/RCPT/DATA response set. */
2679d413 3052
059ec3d9
PH
3053for (;;)
3054 {
3055 uschar *nl = Ustrchr(msg, '\n');
3056 if (nl == NULL)
3057 {
925ac8e4 3058 smtp_printf("%.3s%c%.*s%s\r\n", !final, code, final ? ' ':'-', esclen, esc, msg);
059ec3d9
PH
3059 return;
3060 }
3061 else if (nl[1] == 0 || no_multiline_responses)
3062 {
925ac8e4 3063 smtp_printf("%.3s%c%.*s%.*s\r\n", !final, code, final ? ' ':'-', esclen, esc,
a5bd321b 3064 (int)(nl - msg), msg);
059ec3d9
PH
3065 return;
3066 }
3067 else
3068 {
925ac8e4 3069 smtp_printf("%.3s-%.*s%.*s\r\n", TRUE, code, esclen, esc, (int)(nl - msg), msg);
059ec3d9
PH
3070 msg = nl + 1;
3071 while (isspace(*msg)) msg++;
3072 }
3073 }
3074}
3075
3076
3077
3078
3079/*************************************************
4e88a19f
PH
3080* Parse user SMTP message *
3081*************************************************/
3082
3083/* This function allows for user messages overriding the response code details
3084by providing a suitable response code string at the start of the message
3085user_msg. Check the message for starting with a response code and optionally an
3086extended status code. If found, check that the first digit is valid, and if so,
3087change the code pointer and length to use the replacement. An invalid code
3088causes a panic log; in this case, if the log messages is the same as the user
3089message, we must also adjust the value of the log message to show the code that
3090is actually going to be used (the original one).
3091
3092This function is global because it is called from receive.c as well as within
3093this module.
3094
d6a96edc
PH
3095Note that the code length returned includes the terminating whitespace
3096character, which is always included in the regex match.
3097
4e88a19f
PH
3098Arguments:
3099 code SMTP code, may involve extended status codes
d6a96edc 3100 codelen length of smtp code; if > 4 there's an ESC
4e88a19f
PH
3101 msg message text
3102 log_msg optional log message, to be adjusted with the new SMTP code
4f6ae5c3 3103 check_valid if true, verify the response code
4e88a19f
PH
3104
3105Returns: nothing
3106*/
3107
3108void
4f6ae5c3
JH
3109smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg,
3110 BOOL check_valid)
4e88a19f
PH
3111{
3112int n;
3113int ovector[3];
3114
4f6ae5c3 3115if (!msg || !*msg) return;
4e88a19f 3116
4f6ae5c3
JH
3117if ((n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0,
3118 PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int))) < 0) return;
4e88a19f 3119
4f6ae5c3 3120if (check_valid && (*msg)[0] != (*code)[0])
4e88a19f
PH
3121 {
3122 log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with "
3123 "incorrect digit (expected %c) in \"%s\"", (*code)[0], *msg);
3124 if (log_msg != NULL && *log_msg == *msg)
3125 *log_msg = string_sprintf("%s %s", *code, *log_msg + ovector[1]);
3126 }
3127else
3128 {
3129 *code = *msg;
3130 *codelen = ovector[1]; /* Includes final space */
3131 }
3132*msg += ovector[1]; /* Chop the code off the message */
3133return;
3134}
3135
3136
3137
3138
3139/*************************************************
059ec3d9
PH
3140* Handle an ACL failure *
3141*************************************************/
3142
3143/* This function is called when acl_check() fails. As well as calls from within
3144this module, it is called from receive.c for an ACL after DATA. It sorts out
3145logging the incident, and sets up the error response. A message containing
3146newlines is turned into a multiline SMTP response, but for logging, only the
3147first line is used.
3148
a5bd321b
PH
3149There's a table of default permanent failure response codes to use in
3150globals.c, along with the table of names. VFRY is special. Despite RFC1123 it
3151defaults disabled in Exim. However, discussion in connection with RFC 821bis
3152(aka RFC 2821) has concluded that the response should be 252 in the disabled
3153state, because there are broken clients that try VRFY before RCPT. A 5xx
3154response should be given only when the address is positively known to be
4f6ae5c3
JH
3155undeliverable. Sigh. We return 252 if there is no VRFY ACL or it provides
3156no explicit code, but if there is one we let it know best.
3157Also, for ETRN, 458 is given on refusal, and for AUTH, 503.
a5bd321b
PH
3158
3159From Exim 4.63, it is possible to override the response code details by
3160providing a suitable response code string at the start of the message provided
3161in user_msg. The code's first digit is checked for validity.
059ec3d9
PH
3162
3163Arguments:
4f6ae5c3
JH
3164 where where the ACL was called from
3165 rc the failure code
3166 user_msg a message that can be included in an SMTP response
3167 log_msg a message for logging
059ec3d9
PH
3168
3169Returns: 0 in most cases
3170 2 if the failure code was FAIL_DROP, in which case the
3171 SMTP connection should be dropped (this value fits with the
3172 "done" variable in smtp_setup_msg() below)
3173*/
3174
3175int
3176smtp_handle_acl_fail(int where, int rc, uschar *user_msg, uschar *log_msg)
3177{
059ec3d9 3178BOOL drop = rc == FAIL_DROP;
a5bd321b 3179int codelen = 3;
a5bd321b 3180uschar *smtp_code;
059ec3d9
PH
3181uschar *lognl;
3182uschar *sender_info = US"";
64ffc24f 3183uschar *what =
8523533c 3184#ifdef WITH_CONTENT_SCAN
3cc3f762 3185 where == ACL_WHERE_MIME ? US"during MIME ACL checks" :
8e669ac1 3186#endif
3cc3f762
JH
3187 where == ACL_WHERE_PREDATA ? US"DATA" :
3188 where == ACL_WHERE_DATA ? US"after DATA" :
8ccd00b1 3189#ifndef DISABLE_PRDR
3cc3f762 3190 where == ACL_WHERE_PRDR ? US"after DATA PRDR" :
fd98a5c6 3191#endif
3cc3f762
JH
3192 smtp_cmd_data ?
3193 string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data) :
3194 string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]);
059ec3d9
PH
3195
3196if (drop) rc = FAIL;
3197
4e88a19f 3198/* Set the default SMTP code, and allow a user message to change it. */
a5bd321b 3199
4f6ae5c3
JH
3200smtp_code = rc == FAIL ? acl_wherecodes[where] : US"451";
3201smtp_message_code(&smtp_code, &codelen, &user_msg, &log_msg,
3202 where != ACL_WHERE_VRFY);
a5bd321b 3203
059ec3d9
PH
3204/* We used to have sender_address here; however, there was a bug that was not
3205updating sender_address after a rewrite during a verify. When this bug was
3206fixed, sender_address at this point became the rewritten address. I'm not sure
3207this is what should be logged, so I've changed to logging the unrewritten
3208address to retain backward compatibility. */
3209
8523533c 3210#ifndef WITH_CONTENT_SCAN
059ec3d9 3211if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA)
8523533c
TK
3212#else
3213if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA || where == ACL_WHERE_MIME)
3214#endif
059ec3d9 3215 {
b98bb9ac
PP
3216 sender_info = string_sprintf("F=<%s>%s%s%s%s ",
3217 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
3218 sender_host_authenticated ? US" A=" : US"",
3219 sender_host_authenticated ? sender_host_authenticated : US"",
3220 sender_host_authenticated && authenticated_id ? US":" : US"",
3221 sender_host_authenticated && authenticated_id ? authenticated_id : US""
3222 );
059ec3d9
PH
3223 }
3224
3225/* If there's been a sender verification failure with a specific message, and
3226we have not sent a response about it yet, do so now, as a preliminary line for
278c6e6c
PH
3227failures, but not defers. However, always log it for defer, and log it for fail
3228unless the sender_verify_fail log selector has been turned off. */
059ec3d9 3229
02b41d71 3230if (sender_verified_failed &&
059ec3d9
PH
3231 !testflag(sender_verified_failed, af_sverify_told))
3232 {
2679d413
PH
3233 BOOL save_rcpt_in_progress = rcpt_in_progress;
3234 rcpt_in_progress = FALSE; /* So as not to treat these as the error */
3235
059ec3d9
PH
3236 setflag(sender_verified_failed, af_sverify_told);
3237
6c6d6e48 3238 if (rc != FAIL || LOGGING(sender_verify_fail))
278c6e6c
PH
3239 log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s",
3240 host_and_ident(TRUE),
3241 ((sender_verified_failed->special_action & 255) == DEFER)? "defer":"fail",
3242 sender_verified_failed->address,
3243 (sender_verified_failed->message == NULL)? US"" :
3244 string_sprintf(": %s", sender_verified_failed->message));
059ec3d9 3245
02b41d71 3246 if (rc == FAIL && sender_verified_failed->user_message)
a5bd321b 3247 smtp_respond(smtp_code, codelen, FALSE, string_sprintf(
059ec3d9
PH
3248 testflag(sender_verified_failed, af_verify_pmfail)?
3249 "Postmaster verification failed while checking <%s>\n%s\n"
3250 "Several RFCs state that you are required to have a postmaster\n"
3251 "mailbox for each mail domain. This host does not accept mail\n"
3252 "from domains whose servers reject the postmaster address."
3253 :
3254 testflag(sender_verified_failed, af_verify_nsfail)?
3255 "Callback setup failed while verifying <%s>\n%s\n"
3256 "The initial connection, or a HELO or MAIL FROM:<> command was\n"
3257 "rejected. Refusing MAIL FROM:<> does not help fight spam, disregards\n"
3258 "RFC requirements, and stops you from receiving standard bounce\n"
3259 "messages. This host does not accept mail from domains whose servers\n"
3260 "refuse bounces."
3261 :
3262 "Verification failed for <%s>\n%s",
3263 sender_verified_failed->address,
3264 sender_verified_failed->user_message));
2679d413
PH
3265
3266 rcpt_in_progress = save_rcpt_in_progress;
059ec3d9
PH
3267 }
3268
3269/* Sort out text for logging */
3270
3cc3f762
JH
3271log_msg = log_msg ? string_sprintf(": %s", log_msg) : US"";
3272if ((lognl = Ustrchr(log_msg, '\n'))) *lognl = 0;
059ec3d9
PH
3273
3274/* Send permanent failure response to the command, but the code used isn't
3275always a 5xx one - see comments at the start of this function. If the original
3276rc was FAIL_DROP we drop the connection and yield 2. */
3277
ff5929e3
JH
3278if (rc == FAIL)
3279 smtp_respond(smtp_code, codelen, TRUE,
3280 user_msg ? user_msg : US"Administrative prohibition");
059ec3d9
PH
3281
3282/* Send temporary failure response to the command. Don't give any details,
3283unless acl_temp_details is set. This is TRUE for a callout defer, a "defer"
3284verb, and for a header verify when smtp_return_error_details is set.
3285
3286This conditional logic is all somewhat of a mess because of the odd
3287interactions between temp_details and return_error_details. One day it should
3288be re-implemented in a tidier fashion. */
3289
3290else
ff5929e3 3291 if (acl_temp_details && user_msg)
059ec3d9 3292 {
ff5929e3
JH
3293 if ( smtp_return_error_details
3294 && sender_verified_failed
3295 && sender_verified_failed->message
3296 )
a5bd321b 3297 smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message);
ff5929e3 3298
a5bd321b 3299 smtp_respond(smtp_code, codelen, TRUE, user_msg);
059ec3d9
PH
3300 }
3301 else
a5bd321b
PH
3302 smtp_respond(smtp_code, codelen, TRUE,
3303 US"Temporary local problem - please try later");
059ec3d9 3304
6ea85e9a
PH
3305/* Log the incident to the logs that are specified by log_reject_target
3306(default main, reject). This can be empty to suppress logging of rejections. If
3307the connection is not forcibly to be dropped, return 0. Otherwise, log why it
3308is closing if required and return 2. */
059ec3d9 3309
6ea85e9a 3310if (log_reject_target != 0)
887291d2 3311 {
e45a1c37 3312#ifdef SUPPORT_TLS
acec9514
JH
3313 gstring * g = s_tlslog(NULL);
3314 uschar * tls = string_from_gstring(g);
fc16abb4 3315 if (!tls) tls = US"";
e45a1c37 3316#else
fc16abb4 3317 uschar * tls = US"";
e45a1c37 3318#endif
3cc3f762
JH
3319 log_write(where == ACL_WHERE_CONNECT ? L_connection_reject : 0,
3320 log_reject_target, "%s%s%s %s%srejected %s%s",
fc16abb4
JH
3321 LOGGING(dnssec) && sender_host_dnssec ? US" DS" : US"",
3322 host_and_ident(TRUE),
3323 tls,
3324 sender_info,
3325 rc == FAIL ? US"" : US"temporarily ",
3326 what, log_msg);
887291d2 3327 }
059ec3d9
PH
3328
3329if (!drop) return 0;
3330
3331log_write(L_smtp_connection, LOG_MAIN, "%s closed by DROP in ACL",
3332 smtp_get_connection_info());
8f128379
PH
3333
3334/* Run the not-quit ACL, but without any custom messages. This should not be a
3335problem, because we get here only if some other ACL has issued "drop", and
3336in that case, *its* custom messages will have been used above. */
3337
3338smtp_notquit_exit(US"acl-drop", NULL, NULL);
059ec3d9
PH
3339return 2;
3340}
3341
3342
3343
3344
3345/*************************************************
8f128379
PH
3346* Handle SMTP exit when QUIT is not given *
3347*************************************************/
3348
3349/* This function provides a logging/statistics hook for when an SMTP connection
3350is dropped on the floor or the other end goes away. It's a global function
3351because it's called from receive.c as well as this module. As well as running
3352the NOTQUIT ACL, if there is one, this function also outputs a final SMTP
3353response, either with a custom message from the ACL, or using a default. There
3354is one case, however, when no message is output - after "drop". In that case,
3355the ACL that obeyed "drop" has already supplied the custom message, and NULL is
3356passed to this function.
3357
3358In case things go wrong while processing this function, causing an error that
4c04137d 3359may re-enter this function, there is a recursion check.
8f128379
PH
3360
3361Arguments:
3362 reason What $smtp_notquit_reason will be set to in the ACL;
3363 if NULL, the ACL is not run
3364 code The error code to return as part of the response
3365 defaultrespond The default message if there's no user_msg
3366
3367Returns: Nothing
3368*/
3369
3370void
3371smtp_notquit_exit(uschar *reason, uschar *code, uschar *defaultrespond, ...)
3372{
3373int rc;
3374uschar *user_msg = NULL;
3375uschar *log_msg = NULL;
3376
3377/* Check for recursive acll */
3378
3379if (smtp_exit_function_called)
3380 {
3381 log_write(0, LOG_PANIC, "smtp_notquit_exit() called more than once (%s)",
3382 reason);
3383 return;
3384 }
3385smtp_exit_function_called = TRUE;
3386
3387/* Call the not-QUIT ACL, if there is one, unless no reason is given. */
3388
eea0defe 3389if (acl_smtp_notquit && reason)
8f128379
PH
3390 {
3391 smtp_notquit_reason = reason;
eea0defe
JB
3392 if ((rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg,
3393 &log_msg)) == ERROR)
8f128379
PH
3394 log_write(0, LOG_MAIN|LOG_PANIC, "ACL for not-QUIT returned ERROR: %s",
3395 log_msg);
3396 }
3397
3398/* Write an SMTP response if we are expected to give one. As the default
3399responses are all internal, they should always fit in the buffer, but code a
3400warning, just in case. Note that string_vformat() still leaves a complete
3401string, even if it is incomplete. */
3402
eea0defe 3403if (code && defaultrespond)
8f128379 3404 {
eea0defe
JB
3405 if (user_msg)
3406 smtp_respond(code, 3, TRUE, user_msg);
3407 else
8f128379
PH
3408 {
3409 uschar buffer[128];
3410 va_list ap;
3411 va_start(ap, defaultrespond);
3412 if (!string_vformat(buffer, sizeof(buffer), CS defaultrespond, ap))
3413 log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_notquit_exit()");
925ac8e4 3414 smtp_printf("%s %s\r\n", FALSE, code, buffer);
8f128379
PH
3415 va_end(ap);
3416 }
8f128379
PH
3417 mac_smtp_fflush();
3418 }
3419}
3420
3421
3422
3423
3424/*************************************************
d7b47fd0
PH
3425* Verify HELO argument *
3426*************************************************/
3427
3428/* This function is called if helo_verify_hosts or helo_try_verify_hosts is
3429matched. It is also called from ACL processing if verify = helo is used and
3430verification was not previously tried (i.e. helo_try_verify_hosts was not
3431matched). The result of its processing is to set helo_verified and
3432helo_verify_failed. These variables should both be FALSE for this function to
3433be called.
3434
3435Note that EHLO/HELO is legitimately allowed to quote an address literal. Allow
3436for IPv6 ::ffff: literals.
3437
3438Argument: none
3439Returns: TRUE if testing was completed;
3440 FALSE on a temporary failure
3441*/
3442
3443BOOL
3444smtp_verify_helo(void)
3445{
3446BOOL yield = TRUE;
3447
3448HDEBUG(D_receive) debug_printf("verifying EHLO/HELO argument \"%s\"\n",
3449 sender_helo_name);
3450
3451if (sender_helo_name == NULL)
3452 {
3453 HDEBUG(D_receive) debug_printf("no EHLO/HELO command was issued\n");
3454 }
3455
d1d5595c
PH
3456/* Deal with the case of -bs without an IP address */
3457
3458else if (sender_host_address == NULL)
3459 {
3460 HDEBUG(D_receive) debug_printf("no client IP address: assume success\n");
3461 helo_verified = TRUE;
3462 }
3463
3464/* Deal with the more common case when there is a sending IP address */
3465
d7b47fd0
PH
3466else if (sender_helo_name[0] == '[')
3467 {
3468 helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address,
3469 Ustrlen(sender_host_address)) == 0;
3470
3471 #if HAVE_IPV6
3472 if (!helo_verified)
3473 {
3474 if (strncmpic(sender_host_address, US"::ffff:", 7) == 0)
3475 helo_verified = Ustrncmp(sender_helo_name + 1,
3476 sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0;
3477 }
3478 #endif
3479
3480 HDEBUG(D_receive)
3481 { if (helo_verified) debug_printf("matched host address\n"); }
3482 }
3483
3484/* Do a reverse lookup if one hasn't already given a positive or negative
3485response. If that fails, or the name doesn't match, try checking with a forward
3486lookup. */
3487
3488else
3489 {
3490 if (sender_host_name == NULL && !host_lookup_failed)
3491 yield = host_name_lookup() != DEFER;
3492
3493 /* If a host name is known, check it and all its aliases. */
3494
1705dd20
JH
3495 if (sender_host_name)
3496 if ((helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0))
d7b47fd0 3497 {
1705dd20 3498 sender_helo_dnssec = sender_host_dnssec;
d7b47fd0
PH
3499 HDEBUG(D_receive) debug_printf("matched host name\n");
3500 }
3501 else
3502 {
3503 uschar **aliases = sender_host_aliases;
1705dd20
JH
3504 while (*aliases)
3505 if ((helo_verified = strcmpic(*aliases++, sender_helo_name) == 0))
3506 {
3507 sender_helo_dnssec = sender_host_dnssec;
3508 break;
3509 }
3510
3511 HDEBUG(D_receive) if (helo_verified)
d7b47fd0 3512 debug_printf("matched alias %s\n", *(--aliases));
d7b47fd0 3513 }
d7b47fd0
PH
3514
3515 /* Final attempt: try a forward lookup of the helo name */
3516
3517 if (!helo_verified)
3518 {
3519 int rc;
3520 host_item h;
1705dd20
JH
3521 dnssec_domains d;
3522 host_item *hh;
3523
d7b47fd0
PH
3524 h.name = sender_helo_name;
3525 h.address = NULL;
3526 h.mx = MX_NONE;
3527 h.next = NULL;
1705dd20
JH
3528 d.request = US"*";
3529 d.require = US"";
3530
d7b47fd0
PH
3531 HDEBUG(D_receive) debug_printf("getting IP address for %s\n",
3532 sender_helo_name);
1705dd20
JH
3533 rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A,
3534 NULL, NULL, NULL, &d, NULL, NULL);
d7b47fd0 3535 if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
1705dd20 3536 for (hh = &h; hh; hh = hh->next)
d7b47fd0
PH
3537 if (Ustrcmp(hh->address, sender_host_address) == 0)
3538 {
3539 helo_verified = TRUE;
1705dd20 3540 if (h.dnssec == DS_YES) sender_helo_dnssec = TRUE;
d7b47fd0 3541 HDEBUG(D_receive)
1705dd20
JH
3542 {
3543 debug_printf("IP address for %s matches calling address\n"
3544 "Forward DNS security status: %sverified\n",
3545 sender_helo_name, sender_helo_dnssec ? "" : "un");
3546 }
d7b47fd0
PH
3547 break;
3548 }
d7b47fd0
PH
3549 }
3550 }
3551
d1d5595c 3552if (!helo_verified) helo_verify_failed = TRUE; /* We've tried ... */
d7b47fd0
PH
3553return yield;
3554}
3555
3556
3557
3558
3559/*************************************************
4e88a19f
PH
3560* Send user response message *
3561*************************************************/
3562
3563/* This function is passed a default response code and a user message. It calls
3564smtp_message_code() to check and possibly modify the response code, and then
3565calls smtp_respond() to transmit the response. I put this into a function
3566just to avoid a lot of repetition.
3567
3568Arguments:
3569 code the response code
3570 user_msg the user message
3571
3572Returns: nothing
3573*/
3574
3575static void
3576smtp_user_msg(uschar *code, uschar *user_msg)
3577{
3578int len = 3;
4f6ae5c3 3579smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4e88a19f
PH
3580smtp_respond(code, len, TRUE, user_msg);
3581}
3582
3583
3584
b3ef41c9
JH
3585static int
3586smtp_in_auth(auth_instance *au, uschar ** s, uschar ** ss)
3587{
3588const uschar *set_id = NULL;
3589int rc, i;
3590
3591/* Run the checking code, passing the remainder of the command line as
3592data. Initials the $auth<n> variables as empty. Initialize $0 empty and set
3593it as the only set numerical variable. The authenticator may set $auth<n>
3594and also set other numeric variables. The $auth<n> variables are preferred
3595nowadays; the numerical variables remain for backwards compatibility.
3596
3597Afterwards, have a go at expanding the set_id string, even if
3598authentication failed - for bad passwords it can be useful to log the
3599userid. On success, require set_id to expand and exist, and put it in
3600authenticated_id. Save this in permanent store, as the working store gets
3601reset at HELO, RSET, etc. */
3602
3603for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
3604expand_nmax = 0;
3605expand_nlength[0] = 0; /* $0 contains nothing */
3606
3607rc = (au->info->servercode)(au, smtp_cmd_data);