2 * smtp.c -- nmh SMTP interface
4 * This code is Copyright (c) 2002, by the authors of nmh. See the
5 * COPYRIGHT file in the root directory of the nmh distribution for
6 * complete copyright information.
13 #include <h/signals.h>
16 #include <sasl/sasl.h>
17 #include <sasl/saslutil.h>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
23 #endif /* CYRUS_SASL */
26 #include <openssl/ssl.h>
27 #include <openssl/err.h>
28 #endif /* TLS_SUPPORT */
31 * This module implements an interface to SendMail very similar
32 * to the MMDF mm_(3) routines. The sm_() routines herein talk
33 * SMTP to a sendmail process, mapping SMTP reply codes into
38 * On older 4.2BSD machines without the POSIX function `sigaction',
39 * the alarm handing stuff for time-outs will NOT work due to the way
40 * syscalls get restarted. This is not really crucial, since SendMail
41 * is generally well-behaved in this area.
46 * It appears that some versions of Sendmail will return Code 451
47 * when they don't really want to indicate a failure.
48 * "Code 451 almost always means sendmail has deferred; we don't
49 * really want bomb out at this point since sendmail will rectify
50 * things later." So, if you define SENDMAILBUG, Code 451 is
51 * considered the same as Code 250. Yuck!
58 #define NBITS ((sizeof (int)) * 8)
61 * these codes must all be different!
63 #define SM_OPEN 300 /* Changed to 5 minutes to comply with a SHOULD in RFC 1123 */
66 #define SM_MAIL 301 /* changed to 5 minutes and a second (for uniqueness), see above */
67 #define SM_RCPT 302 /* see above */
68 #define SM_DATA 120 /* see above */
69 #define SM_TEXT 180 /* see above */
70 #define SM_DOT 600 /* see above */
75 static int sm_addrs = 0;
76 static int sm_alarmed = 0;
77 static int sm_child = NOTOK;
78 static int sm_debug = 0;
79 static int sm_nl = TRUE;
80 static int sm_verbose = 0;
82 static FILE *sm_rfp = NULL;
83 static FILE *sm_wfp = NULL;
87 * Some globals needed by SASL
90 static sasl_conn_t *conn = NULL; /* SASL connection state */
91 static int sasl_complete = 0; /* Has authentication succeded? */
92 static sasl_ssf_t sasl_ssf; /* Our security strength factor */
93 static char *sasl_pw_context[2]; /* Context to pass into sm_get_pass */
94 static int maxoutbuf; /* Maximum crypto output buffer */
95 static char *sasl_outbuffer; /* SASL output buffer for encryption */
96 static int sasl_outbuflen; /* Current length of data in outbuf */
97 static int sm_get_user(void *, int, const char **, unsigned *);
98 static int sm_get_pass(sasl_conn_t *, void *, int, sasl_secret_t **);
100 static sasl_callback_t callbacks[] = {
101 { SASL_CB_USER, sm_get_user, NULL },
102 #define SM_SASL_N_CB_USER 0
103 { SASL_CB_PASS, sm_get_pass, NULL },
104 #define SM_SASL_N_CB_PASS 1
105 { SASL_CB_AUTHNAME, sm_get_user, NULL },
106 #define SM_SASL_N_CB_AUTHNAME 2
107 { SASL_CB_LIST_END, NULL, NULL },
110 #else /* CYRUS_SASL */
112 #endif /* CYRUS_SASL */
115 static SSL_CTX *sslctx = NULL;
116 static SSL *ssl = NULL;
117 static BIO *sbior = NULL;
118 static BIO *sbiow = NULL;
119 static BIO *io = NULL;
120 #endif /* TLS_SUPPORT */
122 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
123 #define SASL_MAXRECVBUF 65536
124 static int sm_fgetc(FILE *);
125 static char *sasl_inbuffer; /* SASL input buffer for encryption */
126 static char *sasl_inptr; /* Pointer to current inbuf position */
127 static int sasl_inbuflen; /* Current length of data in inbuf */
129 #define sm_fgetc fgetc
132 static int tls_active = 0;
134 static char *sm_noreply = "No reply text given";
135 static char *sm_moreply = "; ";
137 struct smtp sm_reply; /* global... */
141 static int doingEHLO;
142 char *EHLOkeys[MAXEHLO + 1];
147 static int smtp_init (char *, char *, char *, int, int, int, int, int, int,
148 char *, char *, int);
149 static int sendmail_init (char *, char *, int, int, int, int, int, int,
152 static int rclient (char *, char *);
153 static int sm_ierror (char *fmt, ...);
154 static int smtalk (int time, char *fmt, ...);
155 static int sm_wrecord (char *, int);
156 static int sm_wstream (char *, int);
157 static int sm_werror (void);
158 static int smhear (void);
159 static int sm_rrecord (char *, int *);
160 static int sm_rerror (int);
161 static RETSIGTYPE alrmser (int);
162 static char *EHLOset (char *);
163 static int sm_fwrite(char *, int);
164 static int sm_fputs(char *);
165 static int sm_fputc(int);
166 static void sm_fflush(void);
167 static int sm_fgets(char *, int, FILE *);
171 * Function prototypes needed for SASL
174 static int sm_auth_sasl(char *, char *, char *);
175 #endif /* CYRUS_SASL */
178 sm_init (char *client, char *server, char *port, int watch, int verbose,
179 int debug, int onex, int queued, int sasl, char *saslmech,
182 if (sm_mts == MTS_SMTP)
183 return smtp_init (client, server, port, watch, verbose,
184 debug, onex, queued, sasl, saslmech, user, tls);
186 return sendmail_init (client, server, watch, verbose,
187 debug, onex, queued, sasl, saslmech, user);
191 smtp_init (char *client, char *server, char *port, int watch, int verbose,
192 int debug, int onex, int queued,
193 int sasl, char *saslmech, char *user, int tls)
197 #endif /* CYRUS_SASL */
198 int result, sd1, sd2;
203 sm_verbose = verbose;
206 if (sm_rfp != NULL && sm_wfp != NULL)
209 if (client == NULL || *client == '\0') {
213 client = LocalName(); /* no clientname -> LocalName */
218 * Last-ditch check just in case client still isn't set to anything
221 if (client == NULL || *client == '\0')
222 client = "localhost";
224 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
225 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
227 return sm_ierror("Unable to allocate %d bytes for read buffer",
229 #endif /* CYRUS_SASL || TLS_SUPPORT */
231 if ((sd1 = rclient (server, port)) == NOTOK)
234 if ((sd2 = dup (sd1)) == NOTOK) {
236 return sm_ierror ("unable to dup");
239 SIGNAL (SIGALRM, alrmser);
240 SIGNAL (SIGPIPE, SIG_IGN);
242 if ((sm_rfp = fdopen (sd1, "r")) == NULL
243 || (sm_wfp = fdopen (sd2, "w")) == NULL) {
246 sm_rfp = sm_wfp = NULL;
247 return sm_ierror ("unable to fdopen");
267 * Give EHLO or HELO command
271 result = smtalk (SM_HELO, "EHLO %s", client);
274 if (result >= 500 && result <= 599)
275 result = smtalk (SM_HELO, "HELO %s", client);
284 * If the user requested TLS support, then try to do the STARTTLS command
285 * as part of the initial dialog. Assuming this works, we then need to
286 * restart the EHLO dialog after TLS negotiation is complete.
292 if (! EHLOset("STARTTLS")) {
294 return sm_ierror("SMTP server does not support TLS");
297 result = smtalk(SM_HELO, "STARTTLS");
305 * Okay, the other side should be waiting for us to start TLS
306 * negotiation. Oblige them.
313 SSL_load_error_strings();
315 method = TLSv1_client_method(); /* Not sure about this */
317 sslctx = SSL_CTX_new(method);
321 return sm_ierror("Unable to initialize OpenSSL context: %s",
322 ERR_error_string(ERR_get_error(), NULL));
326 ssl = SSL_new(sslctx);
330 return sm_ierror("Unable to create SSL connection: %s",
331 ERR_error_string(ERR_get_error(), NULL));
334 sbior = BIO_new_socket(fileno(sm_rfp), BIO_NOCLOSE);
335 sbiow = BIO_new_socket(fileno(sm_wfp), BIO_NOCLOSE);
337 if (sbior == NULL || sbiow == NULL) {
339 return sm_ierror("Unable to create BIO endpoints: %s",
340 ERR_error_string(ERR_get_error(), NULL));
343 SSL_set_bio(ssl, sbior, sbiow);
344 SSL_set_connect_state(ssl);
347 * Set up a BIO to handle buffering for us
350 io = BIO_new(BIO_f_buffer());
354 return sm_ierror("Unable to create a buffer BIO: %s",
355 ERR_error_string(ERR_get_error(), NULL));
358 ssl_bio = BIO_new(BIO_f_ssl());
362 return sm_ierror("Unable to create a SSL BIO: %s",
363 ERR_error_string(ERR_get_error(), NULL));
366 BIO_set_ssl(ssl_bio, ssl, BIO_CLOSE);
367 BIO_push(io, ssl_bio);
370 * Try doing the handshake now
373 if (BIO_do_handshake(io) < 1) {
375 return sm_ierror("Unable to negotiate SSL connection: %s",
376 ERR_error_string(ERR_get_error(), NULL));
380 SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
381 printf("SSL negotiation successful: %s(%d) %s\n",
382 SSL_CIPHER_get_name(cipher),
383 SSL_CIPHER_get_bits(cipher, NULL),
384 SSL_CIPHER_get_version(cipher));
391 result = smtalk (SM_HELO, "EHLO %s", client);
399 #endif /* TLS_SUPPORT */
403 * If the user asked for SASL, then check to see if the SMTP server
404 * supports it. Otherwise, error out (because the SMTP server
405 * might have been spoofed; we don't want to just silently not
410 if (! (server_mechs = EHLOset("AUTH"))) {
412 return sm_ierror("SMTP server does not support SASL");
415 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
417 return sm_ierror("Requested SASL mech \"%s\" is not in the "
418 "list of supported mechanisms:\n%s",
419 saslmech, server_mechs);
422 if (sm_auth_sasl(user, saslmech ? saslmech : server_mechs,
428 #endif /* CYRUS_SASL */
431 if (watch && EHLOset ("XVRB"))
432 smtalk (SM_HELO, "VERB on");
433 if (onex && EHLOset ("XONE"))
434 smtalk (SM_HELO, "ONEX");
435 if (queued && EHLOset ("XQUE"))
436 smtalk (SM_HELO, "QUED");
442 sendmail_init (char *client, char *server, int watch, int verbose,
443 int debug, int onex, int queued,
444 int sasl, char *saslmech, char *user)
448 #endif /* CYRUS_SASL */
456 sm_verbose = verbose;
458 if (sm_rfp != NULL && sm_wfp != NULL)
461 if (client == NULL || *client == '\0') {
465 client = LocalName(); /* no clientname -> LocalName */
469 * Last-ditch check just in case client still isn't set to anything
472 if (client == NULL || *client == '\0')
473 client = "localhost";
475 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
476 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
478 return sm_ierror("Unable to allocate %d bytes for read buffer",
480 #endif /* CYRUS_SASL || TLS_SUPPORT */
482 if (pipe (pdi) == NOTOK)
483 return sm_ierror ("no pipes");
484 if (pipe (pdo) == NOTOK) {
487 return sm_ierror ("no pipes");
490 for (i = 0; (sm_child = fork ()) == NOTOK && i < 5; i++)
499 return sm_ierror ("unable to fork");
502 if (pdo[0] != fileno (stdin))
503 dup2 (pdo[0], fileno (stdin));
504 if (pdi[1] != fileno (stdout))
505 dup2 (pdi[1], fileno (stdout));
506 if (pdi[1] != fileno (stderr))
507 dup2 (pdi[1], fileno (stderr));
508 for (i = fileno (stderr) + 1; i < NBITS; i++)
512 vec[vecp++] = r1bindex (sendmail, '/');
514 vec[vecp++] = watch ? "-odi" : queued ? "-odq" : "-odb";
515 vec[vecp++] = "-oem";
520 # endif /* not RAND */
525 execvp (sendmail, vec);
526 fprintf (stderr, "unable to exec ");
528 _exit (-1); /* NOTREACHED */
531 SIGNAL (SIGALRM, alrmser);
532 SIGNAL (SIGPIPE, SIG_IGN);
536 if ((sm_rfp = fdopen (pdi[0], "r")) == NULL
537 || (sm_wfp = fdopen (pdo[1], "w")) == NULL) {
540 sm_rfp = sm_wfp = NULL;
541 return sm_ierror ("unable to fdopen");
557 result = smtalk (SM_HELO, "EHLO %s", client);
560 if (500 <= result && result <= 599)
561 result = smtalk (SM_HELO, "HELO %s", client);
574 * If the user asked for SASL, then check to see if the SMTP server
575 * supports it. Otherwise, error out (because the SMTP server
576 * might have been spoofed; we don't want to just silently not
581 if (! (server_mechs = EHLOset("AUTH"))) {
583 return sm_ierror("SMTP server does not support SASL");
586 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
588 return sm_ierror("Requested SASL mech \"%s\" is not in the "
589 "list of supported mechanisms:\n%s",
590 saslmech, server_mechs);
593 if (sm_auth_sasl(user, saslmech ? saslmech : server_mechs,
599 #endif /* CYRUS_SASL */
602 smtalk (SM_HELO, "ONEX");
604 smtalk (SM_HELO, "VERB on");
611 rclient (char *server, char *service)
614 char response[BUFSIZ];
616 if ((sd = client (server, service, response, sizeof(response),
620 sm_ierror ("%s", response);
625 sm_winit (int mode, char *from)
627 char *smtpcom = NULL;
647 /* Hopefully, we do not get here. */
651 switch (smtalk (SM_MAIL, "%s FROM:<%s>", smtpcom, from)) {
668 sm_wadr (char *mbox, char *host, char *path)
670 switch (smtalk (SM_RCPT, host && *host ? "RCPT TO:<%s%s@%s>"
672 path ? path : "", mbox, host)) {
682 #endif /* SENDMAILBUG */
707 switch (smtalk (SM_DATA, "DATA")) {
716 #endif /* SENDMAILBUG */
733 sm_wtxt (char *buffer, int len)
739 result = sm_wstream (buffer, len);
742 return (result == NOTOK ? RP_BHST : RP_OK);
749 if (sm_wstream ((char *) NULL, 0) == NOTOK)
752 switch (smtalk (SM_DOT + 3 * sm_addrs, ".")) {
760 #endif /* SENDMAILBUG */
778 if (sm_mts == MTS_SENDMAIL) {
789 if (sm_rfp == NULL && sm_wfp == NULL)
794 smtalk (SM_QUIT, "QUIT");
798 sm_note.code = sm_reply.code;
799 sm_note.length = sm_reply.length;
800 memcpy (sm_note.text, sm_reply.text, sm_reply.length + 1);/* fall */
802 if (smtalk (SM_RSET, "RSET") == 250 && type == DONE)
804 if (sm_mts == MTS_SMTP)
805 smtalk (SM_QUIT, "QUIT");
807 kill (sm_child, SIGKILL);
812 sm_reply.code = sm_note.code;
813 sm_reply.length = sm_note.length;
814 memcpy (sm_reply.text, sm_note.text, sm_note.length + 1);
821 BIO_ssl_shutdown(io);
824 #endif /* TLS_SUPPORT */
826 if (sm_rfp != NULL) {
831 if (sm_wfp != NULL) {
837 if (sm_mts == MTS_SMTP) {
842 if (sasl_outbuffer) {
843 free(sasl_outbuffer);
848 #endif /* CYRUS_SASL */
850 status = pidwait (sm_child, OK);
854 sm_rfp = sm_wfp = NULL;
855 return (status ? RP_BHST : RP_OK);
860 * This function implements SASL authentication for SMTP. If this function
861 * completes successfully, then authentication is successful and we've
862 * (optionally) negotiated a security layer.
865 sm_auth_sasl(char *user, char *mechlist, char *inhost)
868 unsigned int buflen, outlen;
869 char *buf, outbuf[BUFSIZ], host[NI_MAXHOST];
870 const char *chosen_mech;
871 sasl_security_properties_t secprops;
876 * Initialize the callback contexts
880 user = getusername();
882 callbacks[SM_SASL_N_CB_USER].context = user;
883 callbacks[SM_SASL_N_CB_AUTHNAME].context = user;
886 * This is a _bit_ of a hack ... but if the hostname wasn't supplied
887 * to us on the command line, then call getpeername and do a
888 * reverse-address lookup on the IP address to get the name.
891 memset(host, 0, sizeof(host));
894 struct sockaddr_storage sin;
895 socklen_t len = sizeof(sin);
898 if (getpeername(fileno(sm_wfp), (struct sockaddr *) &sin, &len) < 0) {
899 sm_ierror("getpeername on SMTP socket failed: %s",
904 result = getnameinfo((struct sockaddr *) &sin, len, host, sizeof(host),
905 NULL, 0, NI_NAMEREQD);
907 sm_ierror("Unable to look up name of connected host: %s",
908 gai_strerror(result));
912 strncpy(host, inhost, sizeof(host) - 1);
915 sasl_pw_context[0] = host;
916 sasl_pw_context[1] = user;
918 callbacks[SM_SASL_N_CB_PASS].context = sasl_pw_context;
920 result = sasl_client_init(callbacks);
922 if (result != SASL_OK) {
923 sm_ierror("SASL library initialization failed: %s",
924 sasl_errstring(result, NULL, NULL));
928 result = sasl_client_new("smtp", host, NULL, NULL, NULL, 0, &conn);
930 if (result != SASL_OK) {
931 sm_ierror("SASL client initialization failed: %s",
932 sasl_errstring(result, NULL, NULL));
937 * Initialize the security properties. But if TLS is active, then
938 * don't negotiate encryption here.
941 memset(&secprops, 0, sizeof(secprops));
942 secprops.maxbufsize = SASL_MAXRECVBUF;
943 secprops.max_ssf = tls_active ? 0 : UINT_MAX;
945 result = sasl_setprop(conn, SASL_SEC_PROPS, &secprops);
947 if (result != SASL_OK) {
948 sm_ierror("SASL security property initialization failed: %s",
949 sasl_errstring(result, NULL, NULL));
954 * Start the actual protocol. Feed the mech list into the library
955 * and get out a possible initial challenge
958 result = sasl_client_start(conn, mechlist, NULL, (const char **) &buf,
959 &buflen, (const char **) &chosen_mech);
961 if (result != SASL_OK && result != SASL_CONTINUE) {
962 sm_ierror("SASL client start failed: %s", sasl_errdetail(conn));
967 * If we got an initial challenge, send it as part of the AUTH
968 * command; otherwise, just send a plain AUTH command.
972 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
973 if (status != SASL_OK) {
974 sm_ierror("SASL base64 encode failed: %s",
975 sasl_errstring(status, NULL, NULL));
979 status = smtalk(SM_AUTH, "AUTH %s %s", chosen_mech, outbuf);
981 status = smtalk(SM_AUTH, "AUTH %s", chosen_mech);
984 * Now we loop until we either fail, get a SASL_OK, or a 235
985 * response code. Receive the challenges and process them until
989 while (result == SASL_CONTINUE) {
992 * If we get a 235 response, that means authentication has
993 * succeeded and we need to break out of the loop (yes, even if
994 * we still get SASL_CONTINUE from sasl_client_step()).
996 * Otherwise, if we get a message that doesn't seem to be a
997 * valid response, then abort
1002 else if (status < 300 || status > 399)
1006 * Special case; a zero-length response from the SMTP server
1007 * is returned as a single =. If we get that, then set buflen
1008 * to be zero. Otherwise, just decode the response.
1011 if (strcmp("=", sm_reply.text) == 0) {
1014 result = sasl_decode64(sm_reply.text, sm_reply.length,
1015 outbuf, sizeof(outbuf), &outlen);
1017 if (result != SASL_OK) {
1018 smtalk(SM_AUTH, "*");
1019 sm_ierror("SASL base64 decode failed: %s",
1020 sasl_errstring(result, NULL, NULL));
1025 result = sasl_client_step(conn, outbuf, outlen, NULL,
1026 (const char **) &buf, &buflen);
1028 if (result != SASL_OK && result != SASL_CONTINUE) {
1029 smtalk(SM_AUTH, "*");
1030 sm_ierror("SASL client negotiation failed: %s",
1031 sasl_errstring(result, NULL, NULL));
1035 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
1037 if (status != SASL_OK) {
1038 smtalk(SM_AUTH, "*");
1039 sm_ierror("SASL base64 encode failed: %s",
1040 sasl_errstring(status, NULL, NULL));
1044 status = smtalk(SM_AUTH, outbuf);
1048 * Make sure that we got the correct response
1051 if (status < 200 || status > 299)
1055 * We _should_ have completed the authentication successfully.
1056 * Get a few properties from the authentication exchange.
1059 result = sasl_getprop(conn, SASL_MAXOUTBUF, (const void **) &outbufmax);
1061 if (result != SASL_OK) {
1062 sm_ierror("Cannot retrieve SASL negotiated output buffer size: %s",
1063 sasl_errstring(result, NULL, NULL));
1067 maxoutbuf = *outbufmax;
1069 result = sasl_getprop(conn, SASL_SSF, (const void **) &ssf);
1073 if (result != SASL_OK) {
1074 sm_ierror("Cannot retrieve SASL negotiated security strength "
1075 "factor: %s", sasl_errstring(result, NULL, NULL));
1080 sasl_outbuffer = malloc(maxoutbuf);
1082 if (sasl_outbuffer == NULL) {
1083 sm_ierror("Unable to allocate %d bytes for SASL output "
1084 "buffer", maxoutbuf);
1089 sasl_inptr = sasl_inbuffer;
1091 sasl_outbuffer = NULL;
1092 /* Don't NULL out sasl_inbuffer because it could be used in
1102 * Our callback functions to feed data to the SASL library
1106 sm_get_user(void *context, int id, const char **result, unsigned *len)
1108 char *user = (char *) context;
1110 if (! result || ((id != SASL_CB_USER) && (id != SASL_CB_AUTHNAME)))
1111 return SASL_BADPARAM;
1115 *len = strlen(user);
1121 sm_get_pass(sasl_conn_t *conn, void *context, int id,
1122 sasl_secret_t **psecret)
1124 char **pw_context = (char **) context;
1128 if (! psecret || id != SASL_CB_PASS)
1129 return SASL_BADPARAM;
1131 ruserpass(pw_context[0], &(pw_context[1]), &pass);
1135 *psecret = (sasl_secret_t *) malloc(sizeof(sasl_secret_t) + len);
1142 (*psecret)->len = len;
1143 strcpy((char *) (*psecret)->data, pass);
1148 #endif /* CYRUS_SASL */
1151 sm_ierror (char *fmt, ...)
1156 vsnprintf (sm_reply.text, sizeof(sm_reply.text), fmt, ap);
1159 sm_reply.length = strlen (sm_reply.text);
1160 sm_reply.code = NOTOK;
1166 smtalk (int time, char *fmt, ...)
1170 char buffer[BUFSIZ];
1173 vsnprintf (buffer, sizeof(buffer), fmt, ap);
1178 printf("(sasl-encrypted) ");
1180 printf("(tls-encrypted) ");
1181 printf ("=> %s\n", buffer);
1186 alarm ((unsigned) time);
1187 if ((result = sm_wrecord (buffer, strlen (buffer))) != NOTOK)
1196 * write the buffer to the open SMTP channel
1200 sm_wrecord (char *buffer, int len)
1203 return sm_werror ();
1205 sm_fwrite (buffer, len);
1209 return (ferror (sm_wfp) ? sm_werror () : OK);
1214 sm_wstream (char *buffer, int len)
1217 static char lc = '\0';
1220 return sm_werror ();
1222 if (buffer == NULL && len == 0) {
1226 return (ferror (sm_wfp) ? sm_werror () : OK);
1229 for (bp = buffer; len > 0; bp++, len--) {
1238 sm_fputc ('.');/* FALL THROUGH */
1243 if (ferror (sm_wfp))
1244 return sm_werror ();
1249 return (ferror (sm_wfp) ? sm_werror () : OK);
1253 * Write out to the network, but do buffering for SASL (if enabled)
1257 sm_fwrite(char *buffer, int len)
1261 unsigned int outputlen;
1263 if (sasl_complete == 0 || sasl_ssf == 0) {
1264 #endif /* CYRUS_SASL */
1269 ret = BIO_write(io, buffer, len);
1272 sm_ierror("TLS error during write: %s",
1273 ERR_error_string(ERR_get_error(), NULL));
1277 #endif /* TLS_SUPPORT */
1278 fwrite(buffer, sizeof(*buffer), len, sm_wfp);
1281 while (len >= maxoutbuf - sasl_outbuflen) {
1282 memcpy(sasl_outbuffer + sasl_outbuflen, buffer,
1283 maxoutbuf - sasl_outbuflen);
1284 len -= maxoutbuf - sasl_outbuflen;
1287 if (sasl_encode(conn, sasl_outbuffer, maxoutbuf,
1288 &output, &outputlen) != SASL_OK) {
1289 sm_ierror("Unable to SASL encode connection data: %s",
1290 sasl_errdetail(conn));
1294 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1298 memcpy(sasl_outbuffer + sasl_outbuflen, buffer, len);
1299 sasl_outbuflen += len;
1302 #endif /* CYRUS_SASL */
1303 return ferror(sm_wfp) ? NOTOK : RP_OK;
1307 * Convenience functions to replace occurences of fputs() and fputc()
1311 sm_fputs(char *buffer)
1313 return sm_fwrite(buffer, strlen(buffer));
1321 return sm_fwrite(&h, 1);
1325 * Flush out any pending data on the connection
1333 unsigned int outputlen;
1336 if (sasl_complete == 1 && sasl_ssf > 0 && sasl_outbuflen > 0) {
1337 result = sasl_encode(conn, sasl_outbuffer, sasl_outbuflen,
1338 &output, &outputlen);
1339 if (result != SASL_OK) {
1340 sm_ierror("Unable to SASL encode connection data: %s",
1341 sasl_errdetail(conn));
1345 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1348 #endif /* CYRUS_SASL */
1352 (void) BIO_flush(io);
1354 #endif /* TLS_SUPPORT */
1363 strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no socket opened"
1364 : sm_alarmed ? "write to socket timed out"
1365 : "error writing to socket"));
1367 return (sm_reply.code = NOTOK);
1374 int i, code, cont, bc = 0, rc, more;
1377 char **ehlo = NULL, buffer[BUFSIZ];
1380 static int at_least_once = 0;
1382 if (at_least_once) {
1385 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1399 sm_reply.length = 0;
1400 sm_reply.text[0] = 0;
1402 rc = sizeof(sm_reply.text) - 1;
1404 for (more = FALSE; sm_rrecord ((char *) (bp = (unsigned char *) buffer),
1408 printf("(sasl-decrypted) ");
1410 printf("(tls-decrypted) ");
1411 printf ("<= %s\n", buffer);
1416 && strncmp (buffer, "250", sizeof("250") - 1) == 0
1417 && (buffer[3] == '-' || doingEHLO == 2)
1419 if (doingEHLO == 2) {
1420 if ((*ehlo = malloc ((size_t) (strlen (buffer + 4) + 1)))) {
1421 strcpy (*ehlo++, buffer + 4);
1423 if (ehlo >= EHLOkeys + MAXEHLO)
1433 for (; bc > 0 && (!isascii (*bp) || !isdigit (*bp)); bp++, bc--)
1437 code = atoi ((char *) bp);
1439 for (; bc > 0 && isspace (*bp); bp++, bc--)
1441 if (bc > 0 && *bp == '-') {
1444 for (; bc > 0 && isspace (*bp); bp++, bc--)
1449 if (code != sm_reply.code || cont)
1453 sm_reply.code = code;
1456 /* can never fail to 0-terminate because of size of buffer vs fixed string */
1457 strncpy (buffer, sm_noreply, sizeof(buffer));
1458 bp = (unsigned char *) buffer;
1459 bc = strlen (sm_noreply);
1463 if ((i = min (bc, rc)) > 0) {
1467 i = strlen(sm_moreply);
1468 if (more && rc > i + 1) {
1469 memcpy (rp, sm_moreply, i); /* safe because of check in if() */
1476 if (sm_reply.code < 100) {
1478 printf ("%s\n", sm_reply.text);
1484 sm_reply.length = rp - sm_reply.text;
1485 sm_reply.text[sm_reply.length] = 0;
1486 return sm_reply.code;
1493 sm_rrecord (char *buffer, int *len)
1498 return sm_rerror(0);
1500 buffer[*len = 0] = 0;
1502 if ((retval = sm_fgets (buffer, BUFSIZ, sm_rfp)) != RP_OK)
1504 *len = strlen (buffer);
1505 /* *len should be >0 except on EOF, but check for safety's sake */
1507 return sm_rerror (RP_EOF);
1508 if (buffer[*len - 1] != '\n')
1509 while ((retval = sm_fgetc (sm_rfp)) != '\n' && retval != EOF &&
1513 if ((*len > 1) && (buffer[*len - 2] == '\r'))
1522 * Our version of fgets, which calls our private fgetc function
1526 sm_fgets(char *buffer, int size, FILE *f)
1540 } while (size > 1 && c != '\n');
1548 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
1550 * Read from the network, but do SASL or TLS encryption
1556 char tmpbuf[BUFSIZ], *retbuf;
1557 unsigned int retbufsize = 0;
1561 * If we have leftover data, return it
1564 if (sasl_inbuflen) {
1566 return (int) *sasl_inptr++;
1570 * If not, read from the network until we have some data to return
1573 while (retbufsize == 0) {
1577 cc = SSL_read(ssl, tmpbuf, sizeof(tmpbuf));
1580 result = SSL_get_error(ssl, cc);
1582 if (result != SSL_ERROR_ZERO_RETURN) {
1583 sm_ierror("TLS peer aborted connection");
1590 sm_ierror("SSL_read failed: %s",
1591 ERR_error_string(ERR_get_error(), NULL));
1595 #endif /* TLS_SUPPORT */
1597 cc = read(fileno(f), tmpbuf, sizeof(tmpbuf));
1603 sm_ierror("Unable to read from network: %s", strerror(errno));
1608 * Don't call sasl_decode unless sasl is complete and we have
1609 * encryption working
1613 if (sasl_complete == 0 || sasl_ssf == 0) {
1617 result = sasl_decode(conn, tmpbuf, cc, (const char **) &retbuf,
1620 if (result != SASL_OK) {
1621 sm_ierror("Unable to decode SASL network data: %s",
1622 sasl_errdetail(conn));
1626 #else /* ! CYRUS_SASL */
1629 #endif /* CYRUS_SASL */
1632 if (retbufsize > SASL_MAXRECVBUF) {
1633 sm_ierror("Received data (%d bytes) is larger than the buffer "
1634 "size (%d bytes)", retbufsize, SASL_MAXRECVBUF);
1638 memcpy(sasl_inbuffer, retbuf, retbufsize);
1639 sasl_inptr = sasl_inbuffer + 1;
1640 sasl_inbuflen = retbufsize - 1;
1642 return (int) sasl_inbuffer[0];
1644 #endif /* CYRUS_SASL || TLS_SUPPORT */
1649 if (sm_mts == MTS_SMTP)
1651 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no socket opened"
1652 : sm_alarmed ? "read from socket timed out"
1653 : rc == RP_EOF ? "premature end-of-file on socket"
1654 : "error reading from socket"));
1657 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no pipe opened"
1658 : sm_alarmed ? "read from pipe timed out"
1659 : rc == RP_EOF ? "premature end-of-file on pipe"
1660 : "error reading from pipe"));
1662 return (sm_reply.code = NOTOK);
1669 #ifndef RELIABLE_SIGNALS
1670 SIGNAL (SIGALRM, alrmser);
1675 printf ("timed out...\n");
1682 rp_string (int code)
1685 static char buffer[BUFSIZ];
1687 switch (sm_reply.code != NOTOK ? code : NOTOK) {
1707 snprintf (buffer, sizeof(buffer), "[%s] %s", text, sm_reply.text);
1727 snprintf (buffer, sizeof(buffer), "[%s] %3d %s",
1728 text, sm_reply.code, sm_reply.text);
1740 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1742 if (strncmp (ep, s, len) == 0) {
1743 for (ep += len; *ep == ' '; ep++)