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 #endif /* TLS_SUPPORT */
121 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
122 #define SASL_MAXRECVBUF 65536
123 static int sm_fgetc(FILE *);
124 static char *sasl_inbuffer; /* SASL input buffer for encryption */
125 static char *sasl_inptr; /* Pointer to current inbuf position */
126 static int sasl_inbuflen; /* Current length of data in inbuf */
128 #define sm_fgetc fgetc
131 static int tls_active = 0;
133 static char *sm_noreply = "No reply text given";
134 static char *sm_moreply = "; ";
136 struct smtp sm_reply; /* global... */
140 static int doingEHLO;
141 char *EHLOkeys[MAXEHLO + 1];
146 static int smtp_init (char *, char *, char *, int, int, int, int, int, int,
147 char *, char *, int);
148 static int sendmail_init (char *, char *, int, int, int, int, int, int,
151 static int rclient (char *, char *);
152 static int sm_ierror (char *fmt, ...);
153 static int smtalk (int time, char *fmt, ...);
154 static int sm_wrecord (char *, int);
155 static int sm_wstream (char *, int);
156 static int sm_werror (void);
157 static int smhear (void);
158 static int sm_rrecord (char *, int *);
159 static int sm_rerror (int);
160 static RETSIGTYPE alrmser (int);
161 static char *EHLOset (char *);
162 static int sm_fwrite(char *, int);
163 static int sm_fputs(char *);
164 static int sm_fputc(int);
165 static void sm_fflush(void);
166 static int sm_fgets(char *, int, FILE *);
170 * Function prototypes needed for SASL
173 static int sm_auth_sasl(char *, char *, char *);
174 #endif /* CYRUS_SASL */
177 sm_init (char *client, char *server, char *port, int watch, int verbose,
178 int debug, int onex, int queued, int sasl, char *saslmech,
181 if (sm_mts == MTS_SMTP)
182 return smtp_init (client, server, port, watch, verbose,
183 debug, onex, queued, sasl, saslmech, user, tls);
185 return sendmail_init (client, server, watch, verbose,
186 debug, onex, queued, sasl, saslmech, user);
190 smtp_init (char *client, char *server, char *port, int watch, int verbose,
191 int debug, int onex, int queued,
192 int sasl, char *saslmech, char *user, int tls)
196 #endif /* CYRUS_SASL */
197 int result, sd1, sd2;
202 sm_verbose = verbose;
205 if (sm_rfp != NULL && sm_wfp != NULL)
208 if (client == NULL || *client == '\0') {
212 client = LocalName(); /* no clientname -> LocalName */
217 * Last-ditch check just in case client still isn't set to anything
220 if (client == NULL || *client == '\0')
221 client = "localhost";
223 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
224 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
226 return sm_ierror("Unable to allocate %d bytes for read buffer",
228 #endif /* CYRUS_SASL || TLS_SUPPORT */
230 if ((sd1 = rclient (server, port)) == NOTOK)
233 if ((sd2 = dup (sd1)) == NOTOK) {
235 return sm_ierror ("unable to dup");
238 SIGNAL (SIGALRM, alrmser);
239 SIGNAL (SIGPIPE, SIG_IGN);
241 if ((sm_rfp = fdopen (sd1, "r")) == NULL
242 || (sm_wfp = fdopen (sd2, "w")) == NULL) {
245 sm_rfp = sm_wfp = NULL;
246 return sm_ierror ("unable to fdopen");
266 * Give EHLO or HELO command
270 result = smtalk (SM_HELO, "EHLO %s", client);
273 if (result >= 500 && result <= 599)
274 result = smtalk (SM_HELO, "HELO %s", client);
283 * If the user requested TLS support, then try to do the STARTTLS command
284 * as part of the initial dialog. Assuming this works, we then need to
285 * restart the EHLO dialog after TLS negotiation is complete.
289 if (! EHLOset("STARTTLS")) {
291 return sm_ierror("SMTP server does not support TLS");
294 result = smtalk(SM_HELO, "STARTTLS");
302 * Okay, the other side should be waiting for us to start TLS
303 * negotiation. Oblige them.
310 SSL_load_error_strings();
312 method = TLSv1_client_method(); /* Not sure about this */
314 sslctx = SSL_CTX_new(method);
318 return sm_ierror("Unable to initialize OpenSSL context: %s",
319 ERR_error_string(ERR_get_error(), NULL));
323 ssl = SSL_new(sslctx);
327 return sm_ierror("Unable to create SSL connection: %s",
328 ERR_error_string(ERR_get_error(), NULL));
331 sbior = BIO_new_socket(fileno(sm_rfp), BIO_NOCLOSE);
332 sbiow = BIO_new_socket(fileno(sm_wfp), BIO_NOCLOSE);
334 if (sbior == NULL || sbiow == NULL) {
336 return sm_ierror("Unable to create BIO endpoints: %s",
337 ERR_error_string(ERR_get_error(), NULL));
340 SSL_set_bio(ssl, sbior, sbiow);
342 if (SSL_connect(ssl) < 1) {
344 return sm_ierror("Unable to negotiate SSL connection: %s",
345 ERR_error_string(ERR_get_error(), NULL));
349 SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
350 printf("SSL negotiation successful: %s(%d) %s\n",
351 SSL_CIPHER_get_name(cipher),
352 SSL_CIPHER_get_bits(cipher, NULL),
353 SSL_CIPHER_get_version(cipher));
360 result = smtalk (SM_HELO, "EHLO %s", client);
368 #endif /* TLS_SUPPORT */
372 * If the user asked for SASL, then check to see if the SMTP server
373 * supports it. Otherwise, error out (because the SMTP server
374 * might have been spoofed; we don't want to just silently not
379 if (! (server_mechs = EHLOset("AUTH"))) {
381 return sm_ierror("SMTP server does not support SASL");
384 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
386 return sm_ierror("Requested SASL mech \"%s\" is not in the "
387 "list of supported mechanisms:\n%s",
388 saslmech, server_mechs);
391 if (sm_auth_sasl(user, saslmech ? saslmech : server_mechs,
397 #endif /* CYRUS_SASL */
400 if (watch && EHLOset ("XVRB"))
401 smtalk (SM_HELO, "VERB on");
402 if (onex && EHLOset ("XONE"))
403 smtalk (SM_HELO, "ONEX");
404 if (queued && EHLOset ("XQUE"))
405 smtalk (SM_HELO, "QUED");
411 sendmail_init (char *client, char *server, int watch, int verbose,
412 int debug, int onex, int queued,
413 int sasl, char *saslmech, char *user)
417 #endif /* CYRUS_SASL */
425 sm_verbose = verbose;
427 if (sm_rfp != NULL && sm_wfp != NULL)
430 if (client == NULL || *client == '\0') {
434 client = LocalName(); /* no clientname -> LocalName */
438 * Last-ditch check just in case client still isn't set to anything
441 if (client == NULL || *client == '\0')
442 client = "localhost";
444 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
445 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
447 return sm_ierror("Unable to allocate %d bytes for read buffer",
449 #endif /* CYRUS_SASL || TLS_SUPPORT */
451 if (pipe (pdi) == NOTOK)
452 return sm_ierror ("no pipes");
453 if (pipe (pdo) == NOTOK) {
456 return sm_ierror ("no pipes");
459 for (i = 0; (sm_child = fork ()) == NOTOK && i < 5; i++)
468 return sm_ierror ("unable to fork");
471 if (pdo[0] != fileno (stdin))
472 dup2 (pdo[0], fileno (stdin));
473 if (pdi[1] != fileno (stdout))
474 dup2 (pdi[1], fileno (stdout));
475 if (pdi[1] != fileno (stderr))
476 dup2 (pdi[1], fileno (stderr));
477 for (i = fileno (stderr) + 1; i < NBITS; i++)
481 vec[vecp++] = r1bindex (sendmail, '/');
483 vec[vecp++] = watch ? "-odi" : queued ? "-odq" : "-odb";
484 vec[vecp++] = "-oem";
489 # endif /* not RAND */
494 execvp (sendmail, vec);
495 fprintf (stderr, "unable to exec ");
497 _exit (-1); /* NOTREACHED */
500 SIGNAL (SIGALRM, alrmser);
501 SIGNAL (SIGPIPE, SIG_IGN);
505 if ((sm_rfp = fdopen (pdi[0], "r")) == NULL
506 || (sm_wfp = fdopen (pdo[1], "w")) == NULL) {
509 sm_rfp = sm_wfp = NULL;
510 return sm_ierror ("unable to fdopen");
526 result = smtalk (SM_HELO, "EHLO %s", client);
529 if (500 <= result && result <= 599)
530 result = smtalk (SM_HELO, "HELO %s", client);
543 * If the user asked for SASL, then check to see if the SMTP server
544 * supports it. Otherwise, error out (because the SMTP server
545 * might have been spoofed; we don't want to just silently not
550 if (! (server_mechs = EHLOset("AUTH"))) {
552 return sm_ierror("SMTP server does not support SASL");
555 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
557 return sm_ierror("Requested SASL mech \"%s\" is not in the "
558 "list of supported mechanisms:\n%s",
559 saslmech, server_mechs);
562 if (sm_auth_sasl(user, saslmech ? saslmech : server_mechs,
568 #endif /* CYRUS_SASL */
571 smtalk (SM_HELO, "ONEX");
573 smtalk (SM_HELO, "VERB on");
580 rclient (char *server, char *service)
583 char response[BUFSIZ];
585 if ((sd = client (server, service, response, sizeof(response),
589 sm_ierror ("%s", response);
594 sm_winit (int mode, char *from)
596 char *smtpcom = NULL;
616 /* Hopefully, we do not get here. */
620 switch (smtalk (SM_MAIL, "%s FROM:<%s>", smtpcom, from)) {
637 sm_wadr (char *mbox, char *host, char *path)
639 switch (smtalk (SM_RCPT, host && *host ? "RCPT TO:<%s%s@%s>"
641 path ? path : "", mbox, host)) {
651 #endif /* SENDMAILBUG */
676 switch (smtalk (SM_DATA, "DATA")) {
685 #endif /* SENDMAILBUG */
702 sm_wtxt (char *buffer, int len)
708 result = sm_wstream (buffer, len);
711 return (result == NOTOK ? RP_BHST : RP_OK);
718 if (sm_wstream ((char *) NULL, 0) == NOTOK)
721 switch (smtalk (SM_DOT + 3 * sm_addrs, ".")) {
729 #endif /* SENDMAILBUG */
747 if (sm_mts == MTS_SENDMAIL) {
758 if (sm_rfp == NULL && sm_wfp == NULL)
763 smtalk (SM_QUIT, "QUIT");
767 sm_note.code = sm_reply.code;
768 sm_note.length = sm_reply.length;
769 memcpy (sm_note.text, sm_reply.text, sm_reply.length + 1);/* fall */
771 if (smtalk (SM_RSET, "RSET") == 250 && type == DONE)
773 if (sm_mts == MTS_SMTP)
774 smtalk (SM_QUIT, "QUIT");
776 kill (sm_child, SIGKILL);
781 sm_reply.code = sm_note.code;
782 sm_reply.length = sm_note.length;
783 memcpy (sm_reply.text, sm_note.text, sm_note.length + 1);
793 #endif /* TLS_SUPPORT */
795 if (sm_rfp != NULL) {
800 if (sm_wfp != NULL) {
806 if (sm_mts == MTS_SMTP) {
811 if (sasl_outbuffer) {
812 free(sasl_outbuffer);
817 #endif /* CYRUS_SASL */
819 status = pidwait (sm_child, OK);
823 sm_rfp = sm_wfp = NULL;
824 return (status ? RP_BHST : RP_OK);
829 * This function implements SASL authentication for SMTP. If this function
830 * completes successfully, then authentication is successful and we've
831 * (optionally) negotiated a security layer.
834 sm_auth_sasl(char *user, char *mechlist, char *inhost)
837 unsigned int buflen, outlen;
838 char *buf, outbuf[BUFSIZ], host[NI_MAXHOST];
839 const char *chosen_mech;
840 sasl_security_properties_t secprops;
845 * Initialize the callback contexts
849 user = getusername();
851 callbacks[SM_SASL_N_CB_USER].context = user;
852 callbacks[SM_SASL_N_CB_AUTHNAME].context = user;
855 * This is a _bit_ of a hack ... but if the hostname wasn't supplied
856 * to us on the command line, then call getpeername and do a
857 * reverse-address lookup on the IP address to get the name.
860 memset(host, 0, sizeof(host));
863 struct sockaddr_storage sin;
864 socklen_t len = sizeof(sin);
867 if (getpeername(fileno(sm_wfp), (struct sockaddr *) &sin, &len) < 0) {
868 sm_ierror("getpeername on SMTP socket failed: %s",
873 result = getnameinfo((struct sockaddr *) &sin, len, host, sizeof(host),
874 NULL, 0, NI_NAMEREQD);
876 sm_ierror("Unable to look up name of connected host: %s",
877 gai_strerror(result));
881 strncpy(host, inhost, sizeof(host) - 1);
884 sasl_pw_context[0] = host;
885 sasl_pw_context[1] = user;
887 callbacks[SM_SASL_N_CB_PASS].context = sasl_pw_context;
889 result = sasl_client_init(callbacks);
891 if (result != SASL_OK) {
892 sm_ierror("SASL library initialization failed: %s",
893 sasl_errstring(result, NULL, NULL));
897 result = sasl_client_new("smtp", host, NULL, NULL, NULL, 0, &conn);
899 if (result != SASL_OK) {
900 sm_ierror("SASL client initialization failed: %s",
901 sasl_errstring(result, NULL, NULL));
906 * Initialize the security properties. But if TLS is active, then
907 * don't negotiate encryption here.
910 memset(&secprops, 0, sizeof(secprops));
911 secprops.maxbufsize = SASL_MAXRECVBUF;
912 secprops.max_ssf = tls_active ? 0 : UINT_MAX;
914 result = sasl_setprop(conn, SASL_SEC_PROPS, &secprops);
916 if (result != SASL_OK) {
917 sm_ierror("SASL security property initialization failed: %s",
918 sasl_errstring(result, NULL, NULL));
923 * Start the actual protocol. Feed the mech list into the library
924 * and get out a possible initial challenge
927 result = sasl_client_start(conn, mechlist, NULL, (const char **) &buf,
928 &buflen, (const char **) &chosen_mech);
930 if (result != SASL_OK && result != SASL_CONTINUE) {
931 sm_ierror("SASL client start failed: %s", sasl_errdetail(conn));
936 * If we got an initial challenge, send it as part of the AUTH
937 * command; otherwise, just send a plain AUTH command.
941 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
942 if (status != SASL_OK) {
943 sm_ierror("SASL base64 encode failed: %s",
944 sasl_errstring(status, NULL, NULL));
948 status = smtalk(SM_AUTH, "AUTH %s %s", chosen_mech, outbuf);
950 status = smtalk(SM_AUTH, "AUTH %s", chosen_mech);
953 * Now we loop until we either fail, get a SASL_OK, or a 235
954 * response code. Receive the challenges and process them until
958 while (result == SASL_CONTINUE) {
961 * If we get a 235 response, that means authentication has
962 * succeeded and we need to break out of the loop (yes, even if
963 * we still get SASL_CONTINUE from sasl_client_step()).
965 * Otherwise, if we get a message that doesn't seem to be a
966 * valid response, then abort
971 else if (status < 300 || status > 399)
975 * Special case; a zero-length response from the SMTP server
976 * is returned as a single =. If we get that, then set buflen
977 * to be zero. Otherwise, just decode the response.
980 if (strcmp("=", sm_reply.text) == 0) {
983 result = sasl_decode64(sm_reply.text, sm_reply.length,
984 outbuf, sizeof(outbuf), &outlen);
986 if (result != SASL_OK) {
987 smtalk(SM_AUTH, "*");
988 sm_ierror("SASL base64 decode failed: %s",
989 sasl_errstring(result, NULL, NULL));
994 result = sasl_client_step(conn, outbuf, outlen, NULL,
995 (const char **) &buf, &buflen);
997 if (result != SASL_OK && result != SASL_CONTINUE) {
998 smtalk(SM_AUTH, "*");
999 sm_ierror("SASL client negotiation failed: %s",
1000 sasl_errstring(result, NULL, NULL));
1004 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
1006 if (status != SASL_OK) {
1007 smtalk(SM_AUTH, "*");
1008 sm_ierror("SASL base64 encode failed: %s",
1009 sasl_errstring(status, NULL, NULL));
1013 status = smtalk(SM_AUTH, outbuf);
1017 * Make sure that we got the correct response
1020 if (status < 200 || status > 299)
1024 * We _should_ have completed the authentication successfully.
1025 * Get a few properties from the authentication exchange.
1028 result = sasl_getprop(conn, SASL_MAXOUTBUF, (const void **) &outbufmax);
1030 if (result != SASL_OK) {
1031 sm_ierror("Cannot retrieve SASL negotiated output buffer size: %s",
1032 sasl_errstring(result, NULL, NULL));
1036 maxoutbuf = *outbufmax;
1038 result = sasl_getprop(conn, SASL_SSF, (const void **) &ssf);
1042 if (result != SASL_OK) {
1043 sm_ierror("Cannot retrieve SASL negotiated security strength "
1044 "factor: %s", sasl_errstring(result, NULL, NULL));
1049 sasl_outbuffer = malloc(maxoutbuf);
1051 if (sasl_outbuffer == NULL) {
1052 sm_ierror("Unable to allocate %d bytes for SASL output "
1053 "buffer", maxoutbuf);
1058 sasl_inptr = sasl_inbuffer;
1060 sasl_outbuffer = NULL;
1061 /* Don't NULL out sasl_inbuffer because it could be used in
1071 * Our callback functions to feed data to the SASL library
1075 sm_get_user(void *context, int id, const char **result, unsigned *len)
1077 char *user = (char *) context;
1079 if (! result || ((id != SASL_CB_USER) && (id != SASL_CB_AUTHNAME)))
1080 return SASL_BADPARAM;
1084 *len = strlen(user);
1090 sm_get_pass(sasl_conn_t *conn, void *context, int id,
1091 sasl_secret_t **psecret)
1093 char **pw_context = (char **) context;
1097 if (! psecret || id != SASL_CB_PASS)
1098 return SASL_BADPARAM;
1100 ruserpass(pw_context[0], &(pw_context[1]), &pass);
1104 *psecret = (sasl_secret_t *) malloc(sizeof(sasl_secret_t) + len);
1111 (*psecret)->len = len;
1112 strcpy((char *) (*psecret)->data, pass);
1117 #endif /* CYRUS_SASL */
1120 sm_ierror (char *fmt, ...)
1125 vsnprintf (sm_reply.text, sizeof(sm_reply.text), fmt, ap);
1128 sm_reply.length = strlen (sm_reply.text);
1129 sm_reply.code = NOTOK;
1135 smtalk (int time, char *fmt, ...)
1139 char buffer[BUFSIZ];
1142 vsnprintf (buffer, sizeof(buffer), fmt, ap);
1147 printf("(sasl-encrypted) ");
1149 printf("(tls-encrypted) ");
1150 printf ("=> %s\n", buffer);
1155 alarm ((unsigned) time);
1156 if ((result = sm_wrecord (buffer, strlen (buffer))) != NOTOK)
1165 * write the buffer to the open SMTP channel
1169 sm_wrecord (char *buffer, int len)
1172 return sm_werror ();
1174 sm_fwrite (buffer, len);
1178 return (ferror (sm_wfp) ? sm_werror () : OK);
1183 sm_wstream (char *buffer, int len)
1186 static char lc = '\0';
1189 return sm_werror ();
1191 if (buffer == NULL && len == 0) {
1195 return (ferror (sm_wfp) ? sm_werror () : OK);
1198 for (bp = buffer; len > 0; bp++, len--) {
1207 sm_fputc ('.');/* FALL THROUGH */
1212 if (ferror (sm_wfp))
1213 return sm_werror ();
1218 return (ferror (sm_wfp) ? sm_werror () : OK);
1222 * Write out to the network, but do buffering for SASL (if enabled)
1226 sm_fwrite(char *buffer, int len)
1230 unsigned int outputlen;
1232 if (sasl_complete == 0 || sasl_ssf == 0) {
1233 #endif /* CYRUS_SASL */
1238 ret = SSL_write(ssl, buffer, len);
1240 if (SSL_get_error(ssl, ret) != SSL_ERROR_NONE) {
1241 sm_ierror("TLS error during write: %s",
1242 ERR_error_string(ERR_get_error(), NULL));
1246 #endif /* TLS_SUPPORT */
1247 fwrite(buffer, sizeof(*buffer), len, sm_wfp);
1250 while (len >= maxoutbuf - sasl_outbuflen) {
1251 memcpy(sasl_outbuffer + sasl_outbuflen, buffer,
1252 maxoutbuf - sasl_outbuflen);
1253 len -= maxoutbuf - sasl_outbuflen;
1256 if (sasl_encode(conn, sasl_outbuffer, maxoutbuf,
1257 &output, &outputlen) != SASL_OK) {
1258 sm_ierror("Unable to SASL encode connection data: %s",
1259 sasl_errdetail(conn));
1263 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1267 memcpy(sasl_outbuffer + sasl_outbuflen, buffer, len);
1268 sasl_outbuflen += len;
1271 #endif /* CYRUS_SASL */
1272 return ferror(sm_wfp) ? NOTOK : RP_OK;
1276 * Convenience functions to replace occurences of fputs() and fputc()
1280 sm_fputs(char *buffer)
1282 return sm_fwrite(buffer, strlen(buffer));
1290 return sm_fwrite(&h, 1);
1294 * Flush out any pending data on the connection
1302 unsigned int outputlen;
1305 if (sasl_complete == 1 && sasl_ssf > 0 && sasl_outbuflen > 0) {
1306 result = sasl_encode(conn, sasl_outbuffer, sasl_outbuflen,
1307 &output, &outputlen);
1308 if (result != SASL_OK) {
1309 sm_ierror("Unable to SASL encode connection data: %s",
1310 sasl_errdetail(conn));
1314 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1317 #endif /* CYRUS_SASL */
1326 strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no socket opened"
1327 : sm_alarmed ? "write to socket timed out"
1328 : "error writing to socket"));
1330 return (sm_reply.code = NOTOK);
1337 int i, code, cont, bc = 0, rc, more;
1340 char **ehlo = NULL, buffer[BUFSIZ];
1343 static int at_least_once = 0;
1345 if (at_least_once) {
1348 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1362 sm_reply.length = 0;
1363 sm_reply.text[0] = 0;
1365 rc = sizeof(sm_reply.text) - 1;
1367 for (more = FALSE; sm_rrecord ((char *) (bp = (unsigned char *) buffer),
1371 printf("(sasl-decrypted) ");
1373 printf("(tls-decrypted) ");
1374 printf ("<= %s\n", buffer);
1379 && strncmp (buffer, "250", sizeof("250") - 1) == 0
1380 && (buffer[3] == '-' || doingEHLO == 2)
1382 if (doingEHLO == 2) {
1383 if ((*ehlo = malloc ((size_t) (strlen (buffer + 4) + 1)))) {
1384 strcpy (*ehlo++, buffer + 4);
1386 if (ehlo >= EHLOkeys + MAXEHLO)
1396 for (; bc > 0 && (!isascii (*bp) || !isdigit (*bp)); bp++, bc--)
1400 code = atoi ((char *) bp);
1402 for (; bc > 0 && isspace (*bp); bp++, bc--)
1404 if (bc > 0 && *bp == '-') {
1407 for (; bc > 0 && isspace (*bp); bp++, bc--)
1412 if (code != sm_reply.code || cont)
1416 sm_reply.code = code;
1419 /* can never fail to 0-terminate because of size of buffer vs fixed string */
1420 strncpy (buffer, sm_noreply, sizeof(buffer));
1421 bp = (unsigned char *) buffer;
1422 bc = strlen (sm_noreply);
1426 if ((i = min (bc, rc)) > 0) {
1430 i = strlen(sm_moreply);
1431 if (more && rc > i + 1) {
1432 memcpy (rp, sm_moreply, i); /* safe because of check in if() */
1439 if (sm_reply.code < 100) {
1441 printf ("%s\n", sm_reply.text);
1447 sm_reply.length = rp - sm_reply.text;
1448 sm_reply.text[sm_reply.length] = 0;
1449 return sm_reply.code;
1456 sm_rrecord (char *buffer, int *len)
1461 return sm_rerror(0);
1463 buffer[*len = 0] = 0;
1465 if ((retval = sm_fgets (buffer, BUFSIZ, sm_rfp)) != RP_OK)
1467 *len = strlen (buffer);
1468 /* *len should be >0 except on EOF, but check for safety's sake */
1470 return sm_rerror (RP_EOF);
1471 if (buffer[*len - 1] != '\n')
1472 while ((retval = sm_fgetc (sm_rfp)) != '\n' && retval != EOF &&
1476 if ((*len > 1) && (buffer[*len - 2] == '\r'))
1485 * Our version of fgets, which calls our private fgetc function
1489 sm_fgets(char *buffer, int size, FILE *f)
1503 } while (size > 1 && c != '\n');
1511 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
1513 * Read from the network, but do SASL or TLS encryption
1519 char tmpbuf[BUFSIZ], *retbuf;
1520 unsigned int retbufsize = 0;
1524 * If we have leftover data, return it
1527 if (sasl_inbuflen) {
1529 return (int) *sasl_inptr++;
1533 * If not, read from the network until we have some data to return
1536 while (retbufsize == 0) {
1540 cc = SSL_read(ssl, tmpbuf, sizeof(tmpbuf));
1543 result = SSL_get_error(ssl, cc);
1545 if (result != SSL_ERROR_ZERO_RETURN) {
1546 sm_ierror("TLS peer aborted connection");
1553 sm_ierror("SSL_read failed: %s",
1554 ERR_error_string(ERR_get_error(), NULL));
1558 #endif /* TLS_SUPPORT */
1560 cc = read(fileno(f), tmpbuf, sizeof(tmpbuf));
1566 sm_ierror("Unable to read from network: %s", strerror(errno));
1571 * Don't call sasl_decode unless sasl is complete and we have
1572 * encryption working
1576 if (sasl_complete == 0 || sasl_ssf == 0) {
1580 result = sasl_decode(conn, tmpbuf, cc, (const char **) &retbuf,
1583 if (result != SASL_OK) {
1584 sm_ierror("Unable to decode SASL network data: %s",
1585 sasl_errdetail(conn));
1589 #else /* ! CYRUS_SASL */
1592 #endif /* CYRUS_SASL */
1595 if (retbufsize > SASL_MAXRECVBUF) {
1596 sm_ierror("Received data (%d bytes) is larger than the buffer "
1597 "size (%d bytes)", retbufsize, SASL_MAXRECVBUF);
1601 memcpy(sasl_inbuffer, retbuf, retbufsize);
1602 sasl_inptr = sasl_inbuffer + 1;
1603 sasl_inbuflen = retbufsize - 1;
1605 return (int) sasl_inbuffer[0];
1607 #endif /* CYRUS_SASL || TLS_SUPPORT */
1612 if (sm_mts == MTS_SMTP)
1614 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no socket opened"
1615 : sm_alarmed ? "read from socket timed out"
1616 : rc == RP_EOF ? "premature end-of-file on socket"
1617 : "error reading from socket"));
1620 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no pipe opened"
1621 : sm_alarmed ? "read from pipe timed out"
1622 : rc == RP_EOF ? "premature end-of-file on pipe"
1623 : "error reading from pipe"));
1625 return (sm_reply.code = NOTOK);
1632 #ifndef RELIABLE_SIGNALS
1633 SIGNAL (SIGALRM, alrmser);
1638 printf ("timed out...\n");
1645 rp_string (int code)
1648 static char buffer[BUFSIZ];
1650 switch (sm_reply.code != NOTOK ? code : NOTOK) {
1670 snprintf (buffer, sizeof(buffer), "[%s] %s", text, sm_reply.text);
1690 snprintf (buffer, sizeof(buffer), "[%s] %3d %s",
1691 text, sm_reply.code, sm_reply.text);
1703 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1705 if (strncmp (ep, s, len) == 0) {
1706 for (ep += len; *ep == ' '; ep++)