2 * smtp.c -- nmh SMTP interface
6 * This code is Copyright (c) 2002, by the authors of nmh. See the
7 * COPYRIGHT file in the root directory of the nmh distribution for
8 * complete copyright information.
15 #include <h/signals.h>
18 #include <sasl/sasl.h>
19 #include <sasl/saslutil.h>
20 #include <sys/socket.h>
21 #include <netinet/in.h>
22 #include <arpa/inet.h>
25 #endif /* CYRUS_SASL */
28 #include <openssl/ssl.h>
29 #include <openssl/err.h>
30 #endif /* TLS_SUPPORT */
33 * This module implements an interface to SendMail very similar
34 * to the MMDF mm_(3) routines. The sm_() routines herein talk
35 * SMTP to a sendmail process, mapping SMTP reply codes into
40 * On older 4.2BSD machines without the POSIX function `sigaction',
41 * the alarm handing stuff for time-outs will NOT work due to the way
42 * syscalls get restarted. This is not really crucial, since SendMail
43 * is generally well-behaved in this area.
48 * It appears that some versions of Sendmail will return Code 451
49 * when they don't really want to indicate a failure.
50 * "Code 451 almost always means sendmail has deferred; we don't
51 * really want bomb out at this point since sendmail will rectify
52 * things later." So, if you define SENDMAILBUG, Code 451 is
53 * considered the same as Code 250. Yuck!
60 #define NBITS ((sizeof (int)) * 8)
63 * these codes must all be different!
65 #define SM_OPEN 300 /* Changed to 5 minutes to comply with a SHOULD in RFC 1123 */
68 #define SM_MAIL 301 /* changed to 5 minutes and a second (for uniqueness), see above */
69 #define SM_RCPT 302 /* see above */
70 #define SM_DATA 120 /* see above */
71 #define SM_TEXT 180 /* see above */
72 #define SM_DOT 600 /* see above */
77 static int sm_addrs = 0;
78 static int sm_alarmed = 0;
79 static int sm_child = NOTOK;
80 static int sm_debug = 0;
81 static int sm_nl = TRUE;
82 static int sm_verbose = 0;
84 static FILE *sm_rfp = NULL;
85 static FILE *sm_wfp = NULL;
89 * Some globals needed by SASL
92 static sasl_conn_t *conn = NULL; /* SASL connection state */
93 static int sasl_complete = 0; /* Has authentication succeded? */
94 static sasl_ssf_t sasl_ssf; /* Our security strength factor */
95 static char *sasl_pw_context[2]; /* Context to pass into sm_get_pass */
96 static int maxoutbuf; /* Maximum crypto output buffer */
97 static char *sasl_outbuffer; /* SASL output buffer for encryption */
98 static int sasl_outbuflen; /* Current length of data in outbuf */
99 static int sm_get_user(void *, int, const char **, unsigned *);
100 static int sm_get_pass(sasl_conn_t *, void *, int, sasl_secret_t **);
102 static sasl_callback_t callbacks[] = {
103 { SASL_CB_USER, sm_get_user, NULL },
104 #define SM_SASL_N_CB_USER 0
105 { SASL_CB_PASS, sm_get_pass, NULL },
106 #define SM_SASL_N_CB_PASS 1
107 { SASL_CB_AUTHNAME, sm_get_user, NULL },
108 #define SM_SASL_N_CB_AUTHNAME 2
109 { SASL_CB_LIST_END, NULL, NULL },
112 #else /* CYRUS_SASL */
114 #endif /* CYRUS_SASL */
117 static SSL_CTX *sslctx = NULL;
118 static SSL *ssl = NULL;
119 static BIO *sbior = NULL;
120 static BIO *sbiow = NULL;
121 #endif /* TLS_SUPPORT */
123 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
124 #define SASL_MAXRECVBUF 65536
125 static int sm_fgetc(FILE *);
126 static char *sasl_inbuffer; /* SASL input buffer for encryption */
127 static char *sasl_inptr; /* Pointer to current inbuf position */
128 static int sasl_inbuflen; /* Current length of data in inbuf */
130 #define sm_fgetc fgetc
133 static int tls_active = 0;
135 static char *sm_noreply = "No reply text given";
136 static char *sm_moreply = "; ";
138 struct smtp sm_reply; /* global... */
142 static int doingEHLO;
143 char *EHLOkeys[MAXEHLO + 1];
148 static int smtp_init (char *, char *, char *, int, int, int, int, int, int,
149 char *, char *, int);
150 static int sendmail_init (char *, char *, int, int, int, int, int, int,
153 static int rclient (char *, char *);
154 static int sm_ierror (char *fmt, ...);
155 static int smtalk (int time, char *fmt, ...);
156 static int sm_wrecord (char *, int);
157 static int sm_wstream (char *, int);
158 static int sm_werror (void);
159 static int smhear (void);
160 static int sm_rrecord (char *, int *);
161 static int sm_rerror (int);
162 static RETSIGTYPE alrmser (int);
163 static char *EHLOset (char *);
164 static int sm_fwrite(char *, int);
165 static int sm_fputs(char *);
166 static int sm_fputc(int);
167 static void sm_fflush(void);
168 static int sm_fgets(char *, int, FILE *);
172 * Function prototypes needed for SASL
175 static int sm_auth_sasl(char *, char *, char *);
176 #endif /* CYRUS_SASL */
179 sm_init (char *client, char *server, char *port, int watch, int verbose,
180 int debug, int onex, int queued, int sasl, char *saslmech,
183 if (sm_mts == MTS_SMTP)
184 return smtp_init (client, server, port, watch, verbose,
185 debug, onex, queued, sasl, saslmech, user, tls);
187 return sendmail_init (client, server, watch, verbose,
188 debug, onex, queued, sasl, saslmech, user);
192 smtp_init (char *client, char *server, char *port, int watch, int verbose,
193 int debug, int onex, int queued,
194 int sasl, char *saslmech, char *user, int tls)
198 #endif /* CYRUS_SASL */
199 int result, sd1, sd2;
204 sm_verbose = verbose;
207 if (sm_rfp != NULL && sm_wfp != NULL)
210 if (client == NULL || *client == '\0') {
214 client = LocalName(); /* no clientname -> LocalName */
219 * Last-ditch check just in case client still isn't set to anything
222 if (client == NULL || *client == '\0')
223 client = "localhost";
225 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
226 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
228 return sm_ierror("Unable to allocate %d bytes for read buffer",
230 #endif /* CYRUS_SASL || TLS_SUPPORT */
232 if ((sd1 = rclient (server, port)) == NOTOK)
235 if ((sd2 = dup (sd1)) == NOTOK) {
237 return sm_ierror ("unable to dup");
240 SIGNAL (SIGALRM, alrmser);
241 SIGNAL (SIGPIPE, SIG_IGN);
243 if ((sm_rfp = fdopen (sd1, "r")) == NULL
244 || (sm_wfp = fdopen (sd2, "w")) == NULL) {
247 sm_rfp = sm_wfp = NULL;
248 return sm_ierror ("unable to fdopen");
268 * Give EHLO or HELO command
272 result = smtalk (SM_HELO, "EHLO %s", client);
275 if (result >= 500 && result <= 599)
276 result = smtalk (SM_HELO, "HELO %s", client);
285 * If the user requested TLS support, then try to do the STARTTLS command
286 * as part of the initial dialog. Assuming this works, we then need to
287 * restart the EHLO dialog after TLS negotiation is complete.
291 if (! EHLOset("STARTTLS")) {
293 return sm_ierror("SMTP server does not support TLS");
296 result = smtalk(SM_HELO, "STARTTLS");
304 * Okay, the other side should be waiting for us to start TLS
305 * negotiation. Oblige them.
312 SSL_load_error_strings();
314 method = TLSv1_client_method(); /* Not sure about this */
316 sslctx = SSL_CTX_new(method);
320 return sm_ierror("Unable to initialize OpenSSL context: %s",
321 ERR_error_string(ERR_get_error(), NULL));
325 ssl = SSL_new(sslctx);
329 return sm_ierror("Unable to create SSL connection: %s",
330 ERR_error_string(ERR_get_error(), NULL));
333 sbior = BIO_new_socket(fileno(sm_rfp), BIO_NOCLOSE);
334 sbiow = BIO_new_socket(fileno(sm_wfp), BIO_NOCLOSE);
336 if (sbior == NULL || sbiow == NULL) {
338 return sm_ierror("Unable to create BIO endpoints: %s",
339 ERR_error_string(ERR_get_error(), NULL));
342 SSL_set_bio(ssl, sbior, sbiow);
344 if (SSL_connect(ssl) < 1) {
346 return sm_ierror("Unable to negotiate SSL connection: %s",
347 ERR_error_string(ERR_get_error(), NULL));
351 SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
352 printf("SSL negotiation successful: %s(%d) %s\n",
353 SSL_CIPHER_get_name(cipher),
354 SSL_CIPHER_get_bits(cipher, NULL),
355 SSL_CIPHER_get_version(cipher));
362 result = smtalk (SM_HELO, "EHLO %s", client);
370 #endif /* TLS_SUPPORT */
374 * If the user asked for SASL, then check to see if the SMTP server
375 * supports it. Otherwise, error out (because the SMTP server
376 * might have been spoofed; we don't want to just silently not
381 if (! (server_mechs = EHLOset("AUTH"))) {
383 return sm_ierror("SMTP server does not support SASL");
386 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
388 return sm_ierror("Requested SASL mech \"%s\" is not in the "
389 "list of supported mechanisms:\n%s",
390 saslmech, server_mechs);
393 if (sm_auth_sasl(user, saslmech ? saslmech : server_mechs,
399 #endif /* CYRUS_SASL */
402 if (watch && EHLOset ("XVRB"))
403 smtalk (SM_HELO, "VERB on");
404 if (onex && EHLOset ("XONE"))
405 smtalk (SM_HELO, "ONEX");
406 if (queued && EHLOset ("XQUE"))
407 smtalk (SM_HELO, "QUED");
413 sendmail_init (char *client, char *server, int watch, int verbose,
414 int debug, int onex, int queued,
415 int sasl, char *saslmech, char *user)
419 #endif /* CYRUS_SASL */
427 sm_verbose = verbose;
429 if (sm_rfp != NULL && sm_wfp != NULL)
432 if (client == NULL || *client == '\0') {
436 client = LocalName(); /* no clientname -> LocalName */
440 * Last-ditch check just in case client still isn't set to anything
443 if (client == NULL || *client == '\0')
444 client = "localhost";
447 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
449 return sm_ierror("Unable to allocate %d bytes for read buffer",
451 #endif /* CYRUS_SASL */
453 if (pipe (pdi) == NOTOK)
454 return sm_ierror ("no pipes");
455 if (pipe (pdo) == NOTOK) {
458 return sm_ierror ("no pipes");
461 for (i = 0; (sm_child = fork ()) == NOTOK && i < 5; i++)
470 return sm_ierror ("unable to fork");
473 if (pdo[0] != fileno (stdin))
474 dup2 (pdo[0], fileno (stdin));
475 if (pdi[1] != fileno (stdout))
476 dup2 (pdi[1], fileno (stdout));
477 if (pdi[1] != fileno (stderr))
478 dup2 (pdi[1], fileno (stderr));
479 for (i = fileno (stderr) + 1; i < NBITS; i++)
483 vec[vecp++] = r1bindex (sendmail, '/');
485 vec[vecp++] = watch ? "-odi" : queued ? "-odq" : "-odb";
486 vec[vecp++] = "-oem";
491 # endif /* not RAND */
496 execvp (sendmail, vec);
497 fprintf (stderr, "unable to exec ");
499 _exit (-1); /* NOTREACHED */
502 SIGNAL (SIGALRM, alrmser);
503 SIGNAL (SIGPIPE, SIG_IGN);
507 if ((sm_rfp = fdopen (pdi[0], "r")) == NULL
508 || (sm_wfp = fdopen (pdo[1], "w")) == NULL) {
511 sm_rfp = sm_wfp = NULL;
512 return sm_ierror ("unable to fdopen");
528 result = smtalk (SM_HELO, "EHLO %s", client);
531 if (500 <= result && result <= 599)
532 result = smtalk (SM_HELO, "HELO %s", client);
545 * If the user asked for SASL, then check to see if the SMTP server
546 * supports it. Otherwise, error out (because the SMTP server
547 * might have been spoofed; we don't want to just silently not
552 if (! (server_mechs = EHLOset("AUTH"))) {
554 return sm_ierror("SMTP server does not support SASL");
557 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
559 return sm_ierror("Requested SASL mech \"%s\" is not in the "
560 "list of supported mechanisms:\n%s",
561 saslmech, server_mechs);
564 if (sm_auth_sasl(user, saslmech ? saslmech : server_mechs,
570 #endif /* CYRUS_SASL */
573 smtalk (SM_HELO, "ONEX");
575 smtalk (SM_HELO, "VERB on");
582 rclient (char *server, char *service)
585 char response[BUFSIZ];
587 if ((sd = client (server, service, response, sizeof(response),
591 sm_ierror ("%s", response);
596 sm_winit (int mode, char *from)
598 char *smtpcom = NULL;
618 /* Hopefully, we do not get here. */
622 switch (smtalk (SM_MAIL, "%s FROM:<%s>", smtpcom, from)) {
639 sm_wadr (char *mbox, char *host, char *path)
641 switch (smtalk (SM_RCPT, host && *host ? "RCPT TO:<%s%s@%s>"
643 path ? path : "", mbox, host)) {
653 #endif /* SENDMAILBUG */
678 switch (smtalk (SM_DATA, "DATA")) {
687 #endif /* SENDMAILBUG */
704 sm_wtxt (char *buffer, int len)
710 result = sm_wstream (buffer, len);
713 return (result == NOTOK ? RP_BHST : RP_OK);
720 if (sm_wstream ((char *) NULL, 0) == NOTOK)
723 switch (smtalk (SM_DOT + 3 * sm_addrs, ".")) {
731 #endif /* SENDMAILBUG */
749 if (sm_mts == MTS_SENDMAIL) {
760 if (sm_rfp == NULL && sm_wfp == NULL)
765 smtalk (SM_QUIT, "QUIT");
769 sm_note.code = sm_reply.code;
770 sm_note.length = sm_reply.length;
771 memcpy (sm_note.text, sm_reply.text, sm_reply.length + 1);/* fall */
773 if (smtalk (SM_RSET, "RSET") == 250 && type == DONE)
775 if (sm_mts == MTS_SMTP)
776 smtalk (SM_QUIT, "QUIT");
778 kill (sm_child, SIGKILL);
783 sm_reply.code = sm_note.code;
784 sm_reply.length = sm_note.length;
785 memcpy (sm_reply.text, sm_note.text, sm_note.length + 1);
795 #endif /* TLS_SUPPORT */
797 if (sm_rfp != NULL) {
802 if (sm_wfp != NULL) {
808 if (sm_mts == MTS_SMTP) {
813 if (sasl_outbuffer) {
814 free(sasl_outbuffer);
819 #endif /* CYRUS_SASL */
821 status = pidwait (sm_child, OK);
825 sm_rfp = sm_wfp = NULL;
826 return (status ? RP_BHST : RP_OK);
831 * This function implements SASL authentication for SMTP. If this function
832 * completes successfully, then authentication is successful and we've
833 * (optionally) negotiated a security layer.
836 sm_auth_sasl(char *user, char *mechlist, char *inhost)
839 unsigned int buflen, outlen;
840 char *buf, outbuf[BUFSIZ], host[NI_MAXHOST];
841 const char *chosen_mech;
842 sasl_security_properties_t secprops;
847 * Initialize the callback contexts
851 user = getusername();
853 callbacks[SM_SASL_N_CB_USER].context = user;
854 callbacks[SM_SASL_N_CB_AUTHNAME].context = user;
857 * This is a _bit_ of a hack ... but if the hostname wasn't supplied
858 * to us on the command line, then call getpeername and do a
859 * reverse-address lookup on the IP address to get the name.
862 memset(host, 0, sizeof(host));
865 struct sockaddr_storage sin;
866 socklen_t len = sizeof(sin);
869 if (getpeername(fileno(sm_wfp), (struct sockaddr *) &sin, &len) < 0) {
870 sm_ierror("getpeername on SMTP socket failed: %s",
875 result = getnameinfo((struct sockaddr *) &sin, len, host, sizeof(host),
876 NULL, 0, NI_NAMEREQD);
878 sm_ierror("Unable to look up name of connected host: %s",
879 gai_strerror(result));
883 strncpy(host, inhost, sizeof(host) - 1);
886 sasl_pw_context[0] = host;
887 sasl_pw_context[1] = user;
889 callbacks[SM_SASL_N_CB_PASS].context = sasl_pw_context;
891 result = sasl_client_init(callbacks);
893 if (result != SASL_OK) {
894 sm_ierror("SASL library initialization failed: %s",
895 sasl_errstring(result, NULL, NULL));
899 result = sasl_client_new("smtp", host, NULL, NULL, NULL, 0, &conn);
901 if (result != SASL_OK) {
902 sm_ierror("SASL client initialization failed: %s",
903 sasl_errstring(result, NULL, NULL));
908 * Initialize the security properties. But if TLS is active, then
909 * don't negotiate encryption here.
912 memset(&secprops, 0, sizeof(secprops));
913 secprops.maxbufsize = SASL_MAXRECVBUF;
914 secprops.max_ssf = tls_active ? 0 : UINT_MAX;
916 result = sasl_setprop(conn, SASL_SEC_PROPS, &secprops);
918 if (result != SASL_OK) {
919 sm_ierror("SASL security property initialization failed: %s",
920 sasl_errstring(result, NULL, NULL));
925 * Start the actual protocol. Feed the mech list into the library
926 * and get out a possible initial challenge
929 result = sasl_client_start(conn, mechlist, NULL, (const char **) &buf,
930 &buflen, (const char **) &chosen_mech);
932 if (result != SASL_OK && result != SASL_CONTINUE) {
933 sm_ierror("SASL client start failed: %s", sasl_errdetail(conn));
938 * If we got an initial challenge, send it as part of the AUTH
939 * command; otherwise, just send a plain AUTH command.
943 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
944 if (status != SASL_OK) {
945 sm_ierror("SASL base64 encode failed: %s",
946 sasl_errstring(status, NULL, NULL));
950 status = smtalk(SM_AUTH, "AUTH %s %s", chosen_mech, outbuf);
952 status = smtalk(SM_AUTH, "AUTH %s", chosen_mech);
955 * Now we loop until we either fail, get a SASL_OK, or a 235
956 * response code. Receive the challenges and process them until
960 while (result == SASL_CONTINUE) {
963 * If we get a 235 response, that means authentication has
964 * succeeded and we need to break out of the loop (yes, even if
965 * we still get SASL_CONTINUE from sasl_client_step()).
967 * Otherwise, if we get a message that doesn't seem to be a
968 * valid response, then abort
973 else if (status < 300 || status > 399)
977 * Special case; a zero-length response from the SMTP server
978 * is returned as a single =. If we get that, then set buflen
979 * to be zero. Otherwise, just decode the response.
982 if (strcmp("=", sm_reply.text) == 0) {
985 result = sasl_decode64(sm_reply.text, sm_reply.length,
986 outbuf, sizeof(outbuf), &outlen);
988 if (result != SASL_OK) {
989 smtalk(SM_AUTH, "*");
990 sm_ierror("SASL base64 decode failed: %s",
991 sasl_errstring(result, NULL, NULL));
996 result = sasl_client_step(conn, outbuf, outlen, NULL,
997 (const char **) &buf, &buflen);
999 if (result != SASL_OK && result != SASL_CONTINUE) {
1000 smtalk(SM_AUTH, "*");
1001 sm_ierror("SASL client negotiation failed: %s",
1002 sasl_errstring(result, NULL, NULL));
1006 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
1008 if (status != SASL_OK) {
1009 smtalk(SM_AUTH, "*");
1010 sm_ierror("SASL base64 encode failed: %s",
1011 sasl_errstring(status, NULL, NULL));
1015 status = smtalk(SM_AUTH, outbuf);
1019 * Make sure that we got the correct response
1022 if (status < 200 || status > 299)
1026 * We _should_ have completed the authentication successfully.
1027 * Get a few properties from the authentication exchange.
1030 result = sasl_getprop(conn, SASL_MAXOUTBUF, (const void **) &outbufmax);
1032 if (result != SASL_OK) {
1033 sm_ierror("Cannot retrieve SASL negotiated output buffer size: %s",
1034 sasl_errstring(result, NULL, NULL));
1038 maxoutbuf = *outbufmax;
1040 result = sasl_getprop(conn, SASL_SSF, (const void **) &ssf);
1044 if (result != SASL_OK) {
1045 sm_ierror("Cannot retrieve SASL negotiated security strength "
1046 "factor: %s", sasl_errstring(result, NULL, NULL));
1051 sasl_outbuffer = malloc(maxoutbuf);
1053 if (sasl_outbuffer == NULL) {
1054 sm_ierror("Unable to allocate %d bytes for SASL output "
1055 "buffer", maxoutbuf);
1060 sasl_inptr = sasl_inbuffer;
1062 sasl_outbuffer = NULL;
1063 /* Don't NULL out sasl_inbuffer because it could be used in
1073 * Our callback functions to feed data to the SASL library
1077 sm_get_user(void *context, int id, const char **result, unsigned *len)
1079 char *user = (char *) context;
1081 if (! result || ((id != SASL_CB_USER) && (id != SASL_CB_AUTHNAME)))
1082 return SASL_BADPARAM;
1086 *len = strlen(user);
1092 sm_get_pass(sasl_conn_t *conn, void *context, int id,
1093 sasl_secret_t **psecret)
1095 char **pw_context = (char **) context;
1099 if (! psecret || id != SASL_CB_PASS)
1100 return SASL_BADPARAM;
1102 ruserpass(pw_context[0], &(pw_context[1]), &pass);
1106 *psecret = (sasl_secret_t *) malloc(sizeof(sasl_secret_t) + len);
1113 (*psecret)->len = len;
1114 strcpy((char *) (*psecret)->data, pass);
1119 #endif /* CYRUS_SASL */
1122 sm_ierror (char *fmt, ...)
1127 vsnprintf (sm_reply.text, sizeof(sm_reply.text), fmt, ap);
1130 sm_reply.length = strlen (sm_reply.text);
1131 sm_reply.code = NOTOK;
1137 smtalk (int time, char *fmt, ...)
1141 char buffer[BUFSIZ];
1144 vsnprintf (buffer, sizeof(buffer), fmt, ap);
1149 printf("(sasl-encrypted) ");
1151 printf("(tls-encrypted) ");
1152 printf ("=> %s\n", buffer);
1157 alarm ((unsigned) time);
1158 if ((result = sm_wrecord (buffer, strlen (buffer))) != NOTOK)
1167 * write the buffer to the open SMTP channel
1171 sm_wrecord (char *buffer, int len)
1174 return sm_werror ();
1176 sm_fwrite (buffer, len);
1180 return (ferror (sm_wfp) ? sm_werror () : OK);
1185 sm_wstream (char *buffer, int len)
1188 static char lc = '\0';
1191 return sm_werror ();
1193 if (buffer == NULL && len == 0) {
1197 return (ferror (sm_wfp) ? sm_werror () : OK);
1200 for (bp = buffer; len > 0; bp++, len--) {
1209 sm_fputc ('.');/* FALL THROUGH */
1214 if (ferror (sm_wfp))
1215 return sm_werror ();
1220 return (ferror (sm_wfp) ? sm_werror () : OK);
1224 * Write out to the network, but do buffering for SASL (if enabled)
1228 sm_fwrite(char *buffer, int len)
1232 unsigned int outputlen;
1234 if (sasl_complete == 0 || sasl_ssf == 0) {
1235 #endif /* CYRUS_SASL */
1240 ret = SSL_write(ssl, buffer, len);
1242 if (SSL_get_error(ssl, ret) != SSL_ERROR_NONE) {
1243 sm_ierror("TLS error during write: %s",
1244 ERR_error_string(ERR_get_error(), NULL));
1248 #endif /* TLS_SUPPORT */
1249 fwrite(buffer, sizeof(*buffer), len, sm_wfp);
1252 while (len >= maxoutbuf - sasl_outbuflen) {
1253 memcpy(sasl_outbuffer + sasl_outbuflen, buffer,
1254 maxoutbuf - sasl_outbuflen);
1255 len -= maxoutbuf - sasl_outbuflen;
1258 if (sasl_encode(conn, sasl_outbuffer, maxoutbuf,
1259 &output, &outputlen) != SASL_OK) {
1260 sm_ierror("Unable to SASL encode connection data: %s",
1261 sasl_errdetail(conn));
1265 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1269 memcpy(sasl_outbuffer + sasl_outbuflen, buffer, len);
1270 sasl_outbuflen += len;
1273 #endif /* CYRUS_SASL */
1274 return ferror(sm_wfp) ? NOTOK : RP_OK;
1278 * Convenience functions to replace occurences of fputs() and fputc()
1282 sm_fputs(char *buffer)
1284 return sm_fwrite(buffer, strlen(buffer));
1292 return sm_fwrite(&h, 1);
1296 * Flush out any pending data on the connection
1304 unsigned int outputlen;
1307 if (sasl_complete == 1 && sasl_ssf > 0 && sasl_outbuflen > 0) {
1308 result = sasl_encode(conn, sasl_outbuffer, sasl_outbuflen,
1309 &output, &outputlen);
1310 if (result != SASL_OK) {
1311 sm_ierror("Unable to SASL encode connection data: %s",
1312 sasl_errdetail(conn));
1316 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1319 #endif /* CYRUS_SASL */
1328 strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no socket opened"
1329 : sm_alarmed ? "write to socket timed out"
1330 : "error writing to socket"));
1332 return (sm_reply.code = NOTOK);
1339 int i, code, cont, bc = 0, rc, more;
1342 char **ehlo = NULL, buffer[BUFSIZ];
1345 static int at_least_once = 0;
1347 if (at_least_once) {
1350 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1364 sm_reply.length = 0;
1365 sm_reply.text[0] = 0;
1367 rc = sizeof(sm_reply.text) - 1;
1369 for (more = FALSE; sm_rrecord ((char *) (bp = (unsigned char *) buffer),
1373 printf("(sasl-decrypted) ");
1375 printf("(tls-decrypted) ");
1376 printf ("<= %s\n", buffer);
1381 && strncmp (buffer, "250", sizeof("250") - 1) == 0
1382 && (buffer[3] == '-' || doingEHLO == 2)
1384 if (doingEHLO == 2) {
1385 if ((*ehlo = malloc ((size_t) (strlen (buffer + 4) + 1)))) {
1386 strcpy (*ehlo++, buffer + 4);
1388 if (ehlo >= EHLOkeys + MAXEHLO)
1398 for (; bc > 0 && (!isascii (*bp) || !isdigit (*bp)); bp++, bc--)
1402 code = atoi ((char *) bp);
1404 for (; bc > 0 && isspace (*bp); bp++, bc--)
1406 if (bc > 0 && *bp == '-') {
1409 for (; bc > 0 && isspace (*bp); bp++, bc--)
1414 if (code != sm_reply.code || cont)
1418 sm_reply.code = code;
1421 /* can never fail to 0-terminate because of size of buffer vs fixed string */
1422 strncpy (buffer, sm_noreply, sizeof(buffer));
1423 bp = (unsigned char *) buffer;
1424 bc = strlen (sm_noreply);
1428 if ((i = min (bc, rc)) > 0) {
1432 i = strlen(sm_moreply);
1433 if (more && rc > i + 1) {
1434 memcpy (rp, sm_moreply, i); /* safe because of check in if() */
1441 if (sm_reply.code < 100) {
1443 printf ("%s\n", sm_reply.text);
1449 sm_reply.length = rp - sm_reply.text;
1450 sm_reply.text[sm_reply.length] = 0;
1451 return sm_reply.code;
1458 sm_rrecord (char *buffer, int *len)
1463 return sm_rerror(0);
1465 buffer[*len = 0] = 0;
1467 if ((retval = sm_fgets (buffer, BUFSIZ, sm_rfp)) != RP_OK)
1469 *len = strlen (buffer);
1470 /* *len should be >0 except on EOF, but check for safety's sake */
1472 return sm_rerror (RP_EOF);
1473 if (buffer[*len - 1] != '\n')
1474 while ((retval = sm_fgetc (sm_rfp)) != '\n' && retval != EOF &&
1478 if ((*len > 1) && (buffer[*len - 2] == '\r'))
1487 * Our version of fgets, which calls our private fgetc function
1491 sm_fgets(char *buffer, int size, FILE *f)
1505 } while (size > 1 && c != '\n');
1513 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
1515 * Read from the network, but do SASL or TLS encryption
1521 char tmpbuf[BUFSIZ], *retbuf;
1522 unsigned int retbufsize = 0;
1526 * If we have leftover data, return it
1529 if (sasl_inbuflen) {
1531 return (int) *sasl_inptr++;
1535 * If not, read from the network until we have some data to return
1538 while (retbufsize == 0) {
1542 cc = SSL_read(ssl, tmpbuf, sizeof(tmpbuf));
1545 result = SSL_get_error(ssl, cc);
1547 if (result != SSL_ERROR_ZERO_RETURN) {
1548 sm_ierror("TLS peer aborted connection");
1555 sm_ierror("SSL_read failed: %s",
1556 ERR_error_string(ERR_get_error(), NULL));
1560 #endif /* TLS_SUPPORT */
1562 cc = read(fileno(f), tmpbuf, sizeof(tmpbuf));
1568 sm_ierror("Unable to read from network: %s", strerror(errno));
1573 * Don't call sasl_decode unless sasl is complete and we have
1574 * encryption working
1577 if (sasl_complete == 0 || sasl_ssf == 0) {
1581 result = sasl_decode(conn, tmpbuf, cc, (const char **) &retbuf,
1584 if (result != SASL_OK) {
1585 sm_ierror("Unable to decode SASL network data: %s",
1586 sasl_errdetail(conn));
1592 if (retbufsize > SASL_MAXRECVBUF) {
1593 sm_ierror("Received data (%d bytes) is larger than the buffer "
1594 "size (%d bytes)", retbufsize, SASL_MAXRECVBUF);
1598 memcpy(sasl_inbuffer, retbuf, retbufsize);
1599 sasl_inptr = sasl_inbuffer + 1;
1600 sasl_inbuflen = retbufsize - 1;
1602 return (int) sasl_inbuffer[0];
1604 #endif /* CYRUS_SASL || TLS_SUPPORT */
1609 if (sm_mts == MTS_SMTP)
1611 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no socket opened"
1612 : sm_alarmed ? "read from socket timed out"
1613 : rc == RP_EOF ? "premature end-of-file on socket"
1614 : "error reading from socket"));
1617 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no pipe opened"
1618 : sm_alarmed ? "read from pipe timed out"
1619 : rc == RP_EOF ? "premature end-of-file on pipe"
1620 : "error reading from pipe"));
1622 return (sm_reply.code = NOTOK);
1629 #ifndef RELIABLE_SIGNALS
1630 SIGNAL (SIGALRM, alrmser);
1635 printf ("timed out...\n");
1642 rp_string (int code)
1645 static char buffer[BUFSIZ];
1647 switch (sm_reply.code != NOTOK ? code : NOTOK) {
1667 snprintf (buffer, sizeof(buffer), "[%s] %s", text, sm_reply.text);
1687 snprintf (buffer, sizeof(buffer), "[%s] %3d %s",
1688 text, sm_reply.code, sm_reply.text);
1700 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1702 if (strncmp (ep, s, len) == 0) {
1703 for (ep += len; *ep == ' '; ep++)