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 #endif /* CYRUS_SASL */
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 static BIO *io = NULL;
122 #endif /* TLS_SUPPORT */
124 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
125 #define SASL_MAXRECVBUF 65536
126 static int sm_fgetc(FILE *);
127 static char *sasl_inbuffer; /* SASL input buffer for encryption */
128 static char *sasl_inptr; /* Pointer to current inbuf position */
129 static int sasl_inbuflen; /* Current length of data in inbuf */
131 #define sm_fgetc fgetc
134 static int tls_active = 0;
136 static char *sm_noreply = "No reply text given";
137 static char *sm_moreply = "; ";
139 struct smtp sm_reply; /* global... */
143 static int doingEHLO;
144 char *EHLOkeys[MAXEHLO + 1];
149 static int smtp_init (char *, char *, char *, int, int, int, int, int, int,
150 int, char *, char *, int);
151 static int sendmail_init (char *, char *, int, int, int, int, int, int,
152 int, char *, char *);
154 static int rclient (char *, char *);
155 static int sm_ierror (char *fmt, ...);
156 static int smtalk (int time, char *fmt, ...);
157 static int sm_wrecord (char *, int);
158 static int sm_wstream (char *, int);
159 static int sm_werror (void);
160 static int smhear (void);
161 static int sm_rrecord (char *, int *);
162 static int sm_rerror (int);
163 static void alrmser (int);
164 static char *EHLOset (char *);
165 static int sm_fwrite(char *, int);
166 static int sm_fputs(char *);
167 static int sm_fputc(int);
168 static void sm_fflush(void);
169 static int sm_fgets(char *, int, FILE *);
173 * Function prototypes needed for SASL
176 static int sm_auth_sasl(char *, int, char *, char *);
177 #endif /* CYRUS_SASL */
180 sm_init (char *client, char *server, char *port, int watch, int verbose,
181 int debug, int onex, int queued, int sasl, int saslssf,
182 char *saslmech, char *user, int tls)
184 if (sm_mts == MTS_SMTP)
185 return smtp_init (client, server, port, watch, verbose,
186 debug, onex, queued, sasl, saslssf, saslmech,
189 return sendmail_init (client, server, watch, verbose,
190 debug, onex, queued, sasl, saslssf, saslmech,
195 smtp_init (char *client, char *server, char *port, int watch, int verbose,
196 int debug, int onex, int queued,
197 int sasl, int saslssf, char *saslmech, char *user, int tls)
201 #else /* CYRUS_SASL */
203 NMH_UNUSED (saslssf);
204 NMH_UNUSED (saslmech);
206 #endif /* CYRUS_SASL */
207 int result, sd1, sd2;
212 sm_verbose = verbose;
215 if (sm_rfp != NULL && sm_wfp != NULL)
218 if (client == NULL || *client == '\0') {
222 client = LocalName(1); /* no clientname -> LocalName */
227 * Last-ditch check just in case client still isn't set to anything
230 if (client == NULL || *client == '\0')
231 client = "localhost";
233 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
234 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
236 return sm_ierror("Unable to allocate %d bytes for read buffer",
238 #endif /* CYRUS_SASL || TLS_SUPPORT */
240 if ((sd1 = rclient (server, port)) == NOTOK)
243 if ((sd2 = dup (sd1)) == NOTOK) {
245 return sm_ierror ("unable to dup");
248 SIGNAL (SIGALRM, alrmser);
249 SIGNAL (SIGPIPE, SIG_IGN);
251 if ((sm_rfp = fdopen (sd1, "r")) == NULL
252 || (sm_wfp = fdopen (sd2, "w")) == NULL) {
255 sm_rfp = sm_wfp = NULL;
256 return sm_ierror ("unable to fdopen");
276 * Give EHLO or HELO command
280 result = smtalk (SM_HELO, "EHLO %s", client);
283 if (result >= 500 && result <= 599)
284 result = smtalk (SM_HELO, "HELO %s", client);
293 * If the user requested TLS support, then try to do the STARTTLS command
294 * as part of the initial dialog. Assuming this works, we then need to
295 * restart the EHLO dialog after TLS negotiation is complete.
301 if (! EHLOset("STARTTLS")) {
303 return sm_ierror("SMTP server does not support TLS");
306 result = smtalk(SM_HELO, "STARTTLS");
314 * Okay, the other side should be waiting for us to start TLS
315 * negotiation. Oblige them.
319 const SSL_METHOD *method;
322 SSL_load_error_strings();
324 method = TLSv1_client_method(); /* Not sure about this */
326 sslctx = SSL_CTX_new(method);
330 return sm_ierror("Unable to initialize OpenSSL context: %s",
331 ERR_error_string(ERR_get_error(), NULL));
335 ssl = SSL_new(sslctx);
339 return sm_ierror("Unable to create SSL connection: %s",
340 ERR_error_string(ERR_get_error(), NULL));
343 sbior = BIO_new_socket(fileno(sm_rfp), BIO_NOCLOSE);
344 sbiow = BIO_new_socket(fileno(sm_wfp), BIO_NOCLOSE);
346 if (sbior == NULL || sbiow == NULL) {
348 return sm_ierror("Unable to create BIO endpoints: %s",
349 ERR_error_string(ERR_get_error(), NULL));
352 SSL_set_bio(ssl, sbior, sbiow);
353 SSL_set_connect_state(ssl);
356 * Set up a BIO to handle buffering for us
359 io = BIO_new(BIO_f_buffer());
363 return sm_ierror("Unable to create a buffer BIO: %s",
364 ERR_error_string(ERR_get_error(), NULL));
367 ssl_bio = BIO_new(BIO_f_ssl());
371 return sm_ierror("Unable to create a SSL BIO: %s",
372 ERR_error_string(ERR_get_error(), NULL));
375 BIO_set_ssl(ssl_bio, ssl, BIO_CLOSE);
376 BIO_push(io, ssl_bio);
379 * Try doing the handshake now
382 if (BIO_do_handshake(io) < 1) {
384 return sm_ierror("Unable to negotiate SSL connection: %s",
385 ERR_error_string(ERR_get_error(), NULL));
389 const SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
390 printf("SSL negotiation successful: %s(%d) %s\n",
391 SSL_CIPHER_get_name(cipher),
392 SSL_CIPHER_get_bits(cipher, NULL),
393 SSL_CIPHER_get_version(cipher));
400 result = smtalk (SM_HELO, "EHLO %s", client);
408 #else /* TLS_SUPPORT */
410 #endif /* TLS_SUPPORT */
414 * If the user asked for SASL, then check to see if the SMTP server
415 * supports it. Otherwise, error out (because the SMTP server
416 * might have been spoofed; we don't want to just silently not
421 if (! (server_mechs = EHLOset("AUTH"))) {
423 return sm_ierror("SMTP server does not support SASL");
426 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
428 return sm_ierror("Requested SASL mech \"%s\" is not in the "
429 "list of supported mechanisms:\n%s",
430 saslmech, server_mechs);
433 if (sm_auth_sasl(user, saslssf, saslmech ? saslmech : server_mechs,
439 #endif /* CYRUS_SASL */
442 if (watch && EHLOset ("XVRB"))
443 smtalk (SM_HELO, "VERB on");
444 if (onex && EHLOset ("XONE"))
445 smtalk (SM_HELO, "ONEX");
446 if (queued && EHLOset ("XQUE"))
447 smtalk (SM_HELO, "QUED");
453 sendmail_init (char *client, char *server, int watch, int verbose,
454 int debug, int onex, int queued,
455 int sasl, int saslssf, char *saslmech, char *user)
459 #else /* CYRUS_SASL */
462 NMH_UNUSED (saslssf);
463 NMH_UNUSED (saslmech);
465 #endif /* CYRUS_SASL */
466 unsigned int i, result, vecp;
473 sm_verbose = verbose;
475 if (sm_rfp != NULL && sm_wfp != NULL)
478 if (client == NULL || *client == '\0') {
482 client = LocalName(1); /* no clientname -> LocalName */
486 * Last-ditch check just in case client still isn't set to anything
489 if (client == NULL || *client == '\0')
490 client = "localhost";
492 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
493 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
495 return sm_ierror("Unable to allocate %d bytes for read buffer",
497 #endif /* CYRUS_SASL || TLS_SUPPORT */
499 if (pipe (pdi) == NOTOK)
500 return sm_ierror ("no pipes");
501 if (pipe (pdo) == NOTOK) {
504 return sm_ierror ("no pipes");
507 for (i = 0; (sm_child = fork ()) == NOTOK && i < 5; i++)
516 return sm_ierror ("unable to fork");
519 if (pdo[0] != fileno (stdin))
520 dup2 (pdo[0], fileno (stdin));
521 if (pdi[1] != fileno (stdout))
522 dup2 (pdi[1], fileno (stdout));
523 if (pdi[1] != fileno (stderr))
524 dup2 (pdi[1], fileno (stderr));
525 for (i = fileno (stderr) + 1; i < NBITS; i++)
529 vec[vecp++] = r1bindex (sendmail, '/');
531 vec[vecp++] = watch ? "-odi" : queued ? "-odq" : "-odb";
532 vec[vecp++] = "-oem";
537 # endif /* not RAND */
542 execvp (sendmail, vec);
543 fprintf (stderr, "unable to exec ");
545 _exit (-1); /* NOTREACHED */
548 SIGNAL (SIGALRM, alrmser);
549 SIGNAL (SIGPIPE, SIG_IGN);
553 if ((sm_rfp = fdopen (pdi[0], "r")) == NULL
554 || (sm_wfp = fdopen (pdo[1], "w")) == NULL) {
557 sm_rfp = sm_wfp = NULL;
558 return sm_ierror ("unable to fdopen");
574 result = smtalk (SM_HELO, "EHLO %s", client);
577 if (500 <= result && result <= 599)
578 result = smtalk (SM_HELO, "HELO %s", client);
591 * If the user asked for SASL, then check to see if the SMTP server
592 * supports it. Otherwise, error out (because the SMTP server
593 * might have been spoofed; we don't want to just silently not
598 if (! (server_mechs = EHLOset("AUTH"))) {
600 return sm_ierror("SMTP server does not support SASL");
603 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
605 return sm_ierror("Requested SASL mech \"%s\" is not in the "
606 "list of supported mechanisms:\n%s",
607 saslmech, server_mechs);
610 if (sm_auth_sasl(user, saslssf, saslmech ? saslmech : server_mechs,
616 #endif /* CYRUS_SASL */
619 smtalk (SM_HELO, "ONEX");
621 smtalk (SM_HELO, "VERB on");
628 rclient (char *server, char *service)
631 char response[BUFSIZ];
633 if ((sd = client (server, service, response, sizeof(response),
637 sm_ierror ("%s", response);
642 sm_winit (char *from)
644 switch (smtalk (SM_MAIL, "MAIL FROM:<%s>", from)) {
661 sm_wadr (char *mbox, char *host, char *path)
663 switch (smtalk (SM_RCPT, host && *host ? "RCPT TO:<%s%s@%s>"
665 path ? path : "", mbox, host)) {
675 #endif /* SENDMAILBUG */
700 switch (smtalk (SM_DATA, "DATA")) {
709 #endif /* SENDMAILBUG */
726 sm_wtxt (char *buffer, int len)
732 result = sm_wstream (buffer, len);
735 return (result == NOTOK ? RP_BHST : RP_OK);
742 if (sm_wstream ((char *) NULL, 0) == NOTOK)
745 switch (smtalk (SM_DOT + 3 * sm_addrs, ".")) {
753 #endif /* SENDMAILBUG */
771 if (sm_mts == MTS_SENDMAIL) {
782 if (sm_rfp == NULL && sm_wfp == NULL)
787 smtalk (SM_QUIT, "QUIT");
791 sm_note.code = sm_reply.code;
792 sm_note.length = sm_reply.length;
793 memcpy (sm_note.text, sm_reply.text, sm_reply.length + 1);/* fall */
795 if (smtalk (SM_RSET, "RSET") == 250 && type == DONE)
797 if (sm_mts == MTS_SMTP)
798 smtalk (SM_QUIT, "QUIT");
800 kill (sm_child, SIGKILL);
805 sm_reply.code = sm_note.code;
806 sm_reply.length = sm_note.length;
807 memcpy (sm_reply.text, sm_note.text, sm_note.length + 1);
814 BIO_ssl_shutdown(io);
817 #endif /* TLS_SUPPORT */
819 if (sm_rfp != NULL) {
824 if (sm_wfp != NULL) {
830 if (sm_mts == MTS_SMTP) {
835 if (sasl_outbuffer) {
836 free(sasl_outbuffer);
841 #endif /* CYRUS_SASL */
843 status = pidwait (sm_child, OK);
847 sm_rfp = sm_wfp = NULL;
848 return (status ? RP_BHST : RP_OK);
853 * This function implements SASL authentication for SMTP. If this function
854 * completes successfully, then authentication is successful and we've
855 * (optionally) negotiated a security layer.
858 sm_auth_sasl(char *user, int saslssf, char *mechlist, char *inhost)
861 unsigned int buflen, outlen;
862 char *buf, outbuf[BUFSIZ], host[NI_MAXHOST];
863 const char *chosen_mech;
864 sasl_security_properties_t secprops;
869 * Initialize the callback contexts
873 user = getusername();
875 callbacks[SM_SASL_N_CB_USER].context = user;
876 callbacks[SM_SASL_N_CB_AUTHNAME].context = user;
879 * This is a _bit_ of a hack ... but if the hostname wasn't supplied
880 * to us on the command line, then call getpeername and do a
881 * reverse-address lookup on the IP address to get the name.
884 memset(host, 0, sizeof(host));
887 struct sockaddr_storage sin;
888 socklen_t len = sizeof(sin);
891 if (getpeername(fileno(sm_wfp), (struct sockaddr *) &sin, &len) < 0) {
892 sm_ierror("getpeername on SMTP socket failed: %s",
897 result = getnameinfo((struct sockaddr *) &sin, len, host, sizeof(host),
898 NULL, 0, NI_NAMEREQD);
900 sm_ierror("Unable to look up name of connected host: %s",
901 gai_strerror(result));
905 strncpy(host, inhost, sizeof(host) - 1);
908 sasl_pw_context[0] = host;
909 sasl_pw_context[1] = user;
911 callbacks[SM_SASL_N_CB_PASS].context = sasl_pw_context;
913 result = sasl_client_init(callbacks);
915 if (result != SASL_OK) {
916 sm_ierror("SASL library initialization failed: %s",
917 sasl_errstring(result, NULL, NULL));
921 result = sasl_client_new("smtp", host, NULL, NULL, NULL, 0, &conn);
923 if (result != SASL_OK) {
924 sm_ierror("SASL client initialization failed: %s",
925 sasl_errstring(result, NULL, NULL));
930 * Initialize the security properties. But if TLS is active, then
931 * don't negotiate encryption here.
934 memset(&secprops, 0, sizeof(secprops));
935 secprops.maxbufsize = SASL_MAXRECVBUF;
937 tls_active ? 0 : (saslssf != -1 ? (unsigned int) saslssf : UINT_MAX);
939 result = sasl_setprop(conn, SASL_SEC_PROPS, &secprops);
941 if (result != SASL_OK) {
942 sm_ierror("SASL security property initialization failed: %s",
943 sasl_errstring(result, NULL, NULL));
948 * Start the actual protocol. Feed the mech list into the library
949 * and get out a possible initial challenge
952 result = sasl_client_start(conn, mechlist, NULL, (const char **) &buf,
953 &buflen, (const char **) &chosen_mech);
955 if (result != SASL_OK && result != SASL_CONTINUE) {
956 sm_ierror("SASL client start failed: %s", sasl_errdetail(conn));
961 * If we got an initial challenge, send it as part of the AUTH
962 * command; otherwise, just send a plain AUTH command.
966 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
967 if (status != SASL_OK) {
968 sm_ierror("SASL base64 encode failed: %s",
969 sasl_errstring(status, NULL, NULL));
973 status = smtalk(SM_AUTH, "AUTH %s %s", chosen_mech, outbuf);
975 status = smtalk(SM_AUTH, "AUTH %s", chosen_mech);
978 * Now we loop until we either fail, get a SASL_OK, or a 235
979 * response code. Receive the challenges and process them until
983 while (result == SASL_CONTINUE) {
986 * If we get a 235 response, that means authentication has
987 * succeeded and we need to break out of the loop (yes, even if
988 * we still get SASL_CONTINUE from sasl_client_step()).
990 * Otherwise, if we get a message that doesn't seem to be a
991 * valid response, then abort
996 else if (status < 300 || status > 399)
1000 * Special case; a zero-length response from the SMTP server
1001 * is returned as a single =. If we get that, then set buflen
1002 * to be zero. Otherwise, just decode the response.
1005 if (strcmp("=", sm_reply.text) == 0) {
1008 result = sasl_decode64(sm_reply.text, sm_reply.length,
1009 outbuf, sizeof(outbuf), &outlen);
1011 if (result != SASL_OK) {
1012 smtalk(SM_AUTH, "*");
1013 sm_ierror("SASL base64 decode failed: %s",
1014 sasl_errstring(result, NULL, NULL));
1019 result = sasl_client_step(conn, outbuf, outlen, NULL,
1020 (const char **) &buf, &buflen);
1022 if (result != SASL_OK && result != SASL_CONTINUE) {
1023 smtalk(SM_AUTH, "*");
1024 sm_ierror("SASL client negotiation failed: %s",
1025 sasl_errstring(result, NULL, NULL));
1029 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
1031 if (status != SASL_OK) {
1032 smtalk(SM_AUTH, "*");
1033 sm_ierror("SASL base64 encode failed: %s",
1034 sasl_errstring(status, NULL, NULL));
1038 status = smtalk(SM_AUTH, outbuf);
1042 * Make sure that we got the correct response
1045 if (status < 200 || status > 299)
1049 * We _should_ have completed the authentication successfully.
1050 * Get a few properties from the authentication exchange.
1053 result = sasl_getprop(conn, SASL_MAXOUTBUF, (const void **) &outbufmax);
1055 if (result != SASL_OK) {
1056 sm_ierror("Cannot retrieve SASL negotiated output buffer size: %s",
1057 sasl_errstring(result, NULL, NULL));
1061 maxoutbuf = *outbufmax;
1063 result = sasl_getprop(conn, SASL_SSF, (const void **) &ssf);
1067 if (result != SASL_OK) {
1068 sm_ierror("Cannot retrieve SASL negotiated security strength "
1069 "factor: %s", sasl_errstring(result, NULL, NULL));
1074 sasl_outbuffer = malloc(maxoutbuf);
1076 if (sasl_outbuffer == NULL) {
1077 sm_ierror("Unable to allocate %d bytes for SASL output "
1078 "buffer", maxoutbuf);
1083 sasl_inptr = sasl_inbuffer;
1085 sasl_outbuffer = NULL;
1086 /* Don't NULL out sasl_inbuffer because it could be used in
1096 * Our callback functions to feed data to the SASL library
1100 sm_get_user(void *context, int id, const char **result, unsigned *len)
1102 char *user = (char *) context;
1104 if (! result || ((id != SASL_CB_USER) && (id != SASL_CB_AUTHNAME)))
1105 return SASL_BADPARAM;
1109 *len = strlen(user);
1115 sm_get_pass(sasl_conn_t *conn, void *context, int id,
1116 sasl_secret_t **psecret)
1120 char **pw_context = (char **) context;
1124 if (! psecret || id != SASL_CB_PASS)
1125 return SASL_BADPARAM;
1127 ruserpass(pw_context[0], &(pw_context[1]), &pass);
1131 *psecret = (sasl_secret_t *) malloc(sizeof(sasl_secret_t) + len);
1138 (*psecret)->len = len;
1139 strcpy((char *) (*psecret)->data, pass);
1144 #endif /* CYRUS_SASL */
1147 sm_ierror (char *fmt, ...)
1152 vsnprintf (sm_reply.text, sizeof(sm_reply.text), fmt, ap);
1155 sm_reply.length = strlen (sm_reply.text);
1156 sm_reply.code = NOTOK;
1162 smtalk (int time, char *fmt, ...)
1166 char buffer[BUFSIZ];
1169 vsnprintf (buffer, sizeof(buffer), fmt, ap);
1174 printf("(sasl-encrypted) ");
1176 printf("(tls-encrypted) ");
1177 printf ("=> %s\n", buffer);
1182 alarm ((unsigned) time);
1183 if ((result = sm_wrecord (buffer, strlen (buffer))) != NOTOK)
1192 * write the buffer to the open SMTP channel
1196 sm_wrecord (char *buffer, int len)
1199 return sm_werror ();
1201 sm_fwrite (buffer, len);
1205 return (ferror (sm_wfp) ? sm_werror () : OK);
1210 sm_wstream (char *buffer, int len)
1213 static char lc = '\0';
1216 return sm_werror ();
1218 if (buffer == NULL && len == 0) {
1222 return (ferror (sm_wfp) ? sm_werror () : OK);
1225 for (bp = buffer; len > 0; bp++, len--) {
1234 sm_fputc ('.');/* FALL THROUGH */
1239 if (ferror (sm_wfp))
1240 return sm_werror ();
1245 return (ferror (sm_wfp) ? sm_werror () : OK);
1249 * Write out to the network, but do buffering for SASL (if enabled)
1253 sm_fwrite(char *buffer, int len)
1257 unsigned int outputlen;
1259 if (sasl_complete == 0 || sasl_ssf == 0) {
1260 #endif /* CYRUS_SASL */
1265 ret = BIO_write(io, buffer, len);
1268 sm_ierror("TLS error during write: %s",
1269 ERR_error_string(ERR_get_error(), NULL));
1273 #endif /* TLS_SUPPORT */
1274 fwrite(buffer, sizeof(*buffer), len, sm_wfp);
1277 while (len >= maxoutbuf - sasl_outbuflen) {
1278 memcpy(sasl_outbuffer + sasl_outbuflen, buffer,
1279 maxoutbuf - sasl_outbuflen);
1280 len -= maxoutbuf - sasl_outbuflen;
1283 if (sasl_encode(conn, sasl_outbuffer, maxoutbuf,
1284 &output, &outputlen) != SASL_OK) {
1285 sm_ierror("Unable to SASL encode connection data: %s",
1286 sasl_errdetail(conn));
1290 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1294 memcpy(sasl_outbuffer + sasl_outbuflen, buffer, len);
1295 sasl_outbuflen += len;
1298 #endif /* CYRUS_SASL */
1299 return ferror(sm_wfp) ? NOTOK : RP_OK;
1303 * Convenience functions to replace occurences of fputs() and fputc()
1307 sm_fputs(char *buffer)
1309 return sm_fwrite(buffer, strlen(buffer));
1317 return sm_fwrite(&h, 1);
1321 * Flush out any pending data on the connection
1329 unsigned int outputlen;
1332 if (sasl_complete == 1 && sasl_ssf > 0 && sasl_outbuflen > 0) {
1333 result = sasl_encode(conn, sasl_outbuffer, sasl_outbuflen,
1334 &output, &outputlen);
1335 if (result != SASL_OK) {
1336 sm_ierror("Unable to SASL encode connection data: %s",
1337 sasl_errdetail(conn));
1341 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1344 #endif /* CYRUS_SASL */
1348 (void) BIO_flush(io);
1350 #endif /* TLS_SUPPORT */
1359 strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no socket opened"
1360 : sm_alarmed ? "write to socket timed out"
1361 : "error writing to socket"));
1363 return (sm_reply.code = NOTOK);
1370 int i, code, cont, bc = 0, rc, more;
1373 char **ehlo = NULL, buffer[BUFSIZ];
1376 static int at_least_once = 0;
1378 if (at_least_once) {
1381 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1395 sm_reply.length = 0;
1396 sm_reply.text[0] = 0;
1398 rc = sizeof(sm_reply.text) - 1;
1400 for (more = FALSE; sm_rrecord ((char *) (bp = (unsigned char *) buffer),
1404 printf("(sasl-decrypted) ");
1406 printf("(tls-decrypted) ");
1407 printf ("<= %s\n", buffer);
1412 && strncmp (buffer, "250", sizeof("250") - 1) == 0
1413 && (buffer[3] == '-' || doingEHLO == 2)
1415 if (doingEHLO == 2) {
1416 if ((*ehlo = malloc ((size_t) (strlen (buffer + 4) + 1)))) {
1417 strcpy (*ehlo++, buffer + 4);
1419 if (ehlo >= EHLOkeys + MAXEHLO)
1429 for (; bc > 0 && (!isascii (*bp) || !isdigit (*bp)); bp++, bc--)
1433 code = atoi ((char *) bp);
1435 for (; bc > 0 && isspace (*bp); bp++, bc--)
1437 if (bc > 0 && *bp == '-') {
1440 for (; bc > 0 && isspace (*bp); bp++, bc--)
1445 if (code != sm_reply.code || cont)
1449 sm_reply.code = code;
1452 /* can never fail to 0-terminate because of size of buffer vs fixed string */
1453 strncpy (buffer, sm_noreply, sizeof(buffer));
1454 bp = (unsigned char *) buffer;
1455 bc = strlen (sm_noreply);
1459 if ((i = min (bc, rc)) > 0) {
1463 i = strlen(sm_moreply);
1464 if (more && rc > i + 1) {
1465 memcpy (rp, sm_moreply, i); /* safe because of check in if() */
1472 if (sm_reply.code < 100) {
1474 printf ("%s\n", sm_reply.text);
1480 sm_reply.length = rp - sm_reply.text;
1481 sm_reply.text[sm_reply.length] = 0;
1482 return sm_reply.code;
1489 sm_rrecord (char *buffer, int *len)
1494 return sm_rerror(0);
1496 buffer[*len = 0] = 0;
1498 if ((retval = sm_fgets (buffer, BUFSIZ, sm_rfp)) != RP_OK)
1499 return sm_rerror (retval);
1500 *len = strlen (buffer);
1501 /* *len should be >0 except on EOF, but check for safety's sake */
1503 return sm_rerror (RP_EOF);
1504 if (buffer[*len - 1] != '\n')
1505 while ((retval = sm_fgetc (sm_rfp)) != '\n' && retval != EOF &&
1509 if ((*len > 1) && (buffer[*len - 2] == '\r'))
1518 * Our version of fgets, which calls our private fgetc function
1522 sm_fgets(char *buffer, int size, FILE *f)
1536 } while (size > 1 && c != '\n');
1544 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
1546 * Read from the network, but do SASL or TLS encryption
1552 char tmpbuf[BUFSIZ], *retbuf;
1553 unsigned int retbufsize = 0;
1557 * If we have leftover data, return it
1560 if (sasl_inbuflen) {
1562 return (int) *sasl_inptr++;
1566 * If not, read from the network until we have some data to return
1569 while (retbufsize == 0) {
1573 cc = SSL_read(ssl, tmpbuf, sizeof(tmpbuf));
1576 result = SSL_get_error(ssl, cc);
1578 if (result != SSL_ERROR_ZERO_RETURN) {
1579 sm_ierror("TLS peer aborted connection");
1586 sm_ierror("SSL_read failed: %s",
1587 ERR_error_string(ERR_get_error(), NULL));
1591 #endif /* TLS_SUPPORT */
1593 cc = read(fileno(f), tmpbuf, sizeof(tmpbuf));
1599 sm_ierror("Unable to read from network: %s", strerror(errno));
1604 * Don't call sasl_decode unless sasl is complete and we have
1605 * encryption working
1609 if (sasl_complete == 0 || sasl_ssf == 0) {
1613 result = sasl_decode(conn, tmpbuf, cc, (const char **) &retbuf,
1616 if (result != SASL_OK) {
1617 sm_ierror("Unable to decode SASL network data: %s",
1618 sasl_errdetail(conn));
1622 #else /* ! CYRUS_SASL */
1625 #endif /* CYRUS_SASL */
1628 if (retbufsize > SASL_MAXRECVBUF) {
1629 sm_ierror("Received data (%d bytes) is larger than the buffer "
1630 "size (%d bytes)", retbufsize, SASL_MAXRECVBUF);
1634 memcpy(sasl_inbuffer, retbuf, retbufsize);
1635 sasl_inptr = sasl_inbuffer + 1;
1636 sasl_inbuflen = retbufsize - 1;
1638 return (int) sasl_inbuffer[0];
1640 #endif /* CYRUS_SASL || TLS_SUPPORT */
1645 if (sm_mts == MTS_SMTP)
1647 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no socket opened"
1648 : sm_alarmed ? "read from socket timed out"
1649 : rc == RP_EOF ? "premature end-of-file on socket"
1650 : "error reading from socket"));
1653 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no pipe opened"
1654 : sm_alarmed ? "read from pipe timed out"
1655 : rc == RP_EOF ? "premature end-of-file on pipe"
1656 : "error reading from pipe"));
1658 return (sm_reply.code = NOTOK);
1667 #ifndef RELIABLE_SIGNALS
1668 SIGNAL (SIGALRM, alrmser);
1673 printf ("timed out...\n");
1680 rp_string (int code)
1683 static char buffer[BUFSIZ];
1685 switch (sm_reply.code != NOTOK ? code : NOTOK) {
1705 snprintf (buffer, sizeof(buffer), "[%s] %s", text, sm_reply.text);
1725 snprintf (buffer, sizeof(buffer), "[%s] %3d %s",
1726 text, sm_reply.code, sm_reply.text);
1738 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1740 if (strncmp (ep, s, len) == 0) {
1741 for (ep += len; *ep == ' '; ep++)