2 * socket.c -- socket library functions
4 * Copyright 1998 by Eric S. Raymond.
5 * For license terms, see the file COPYING in this directory.
12 #include <ctype.h> /* isspace() */
15 #endif /* HAVE_MEMORY_H */
16 #include <sys/types.h>
18 #ifndef HAVE_NET_SOCKET_H
19 #include <sys/socket.h>
21 #include <net/socket.h>
24 #include <netinet/in.h>
25 #ifdef HAVE_ARPA_INET_H
26 #include <arpa/inet.h>
29 #if defined(STDC_HEADERS)
32 #if defined(HAVE_UNISTD_H)
35 #if defined(HAVE_STDARG_H)
40 #if TIME_WITH_SYS_TIME
41 # include <sys/time.h>
45 # include <sys/time.h>
52 #include "fetchmail.h"
53 #include "getaddrinfo.h"
57 /* Defines to allow BeOS and Cygwin to play nice... */
60 #define fm_close(a) closesocket(a)
61 #define fm_write(a,b,c) send(a,b,c,0)
62 #define fm_peek(a,b,c) recv(a,b,c,0)
63 #define fm_read(a,b,c) recv(a,b,c,0)
65 #define fm_close(a) close(a)
66 #define fm_write(a,b,c) write(a,b,c)
67 #define fm_peek(a,b,c) recv(a,b,c, MSG_PEEK)
69 #define fm_read(a,b,c) cygwin_read(a,b,c)
70 static ssize_t cygwin_read(int sock, void *buf, size_t count);
71 #else /* ! __CYGWIN__ */
72 #define fm_read(a,b,c) read(a,b,c)
73 #endif /* __CYGWIN__ */
76 /* We need to define h_errno only if it is not already */
78 # if !HAVE_DECL_H_ERRNO
81 #endif /* ndef h_errno */
83 #ifdef HAVE_SOCKETPAIR
84 static char *const *parse_plugin(const char *plugin, const char *host, const char *service)
88 char *cp, *plugin_copy;
89 unsigned int plugin_copy_len;
90 unsigned int plugin_offset = 0, plugin_copy_offset = 0;
91 unsigned int i, s = 2 * sizeof(char*), host_count = 0, service_count = 0;
92 unsigned int plugin_len = strlen(plugin);
93 unsigned int host_len = strlen(host);
94 unsigned int service_len = strlen(service);
96 for (c = p = plugin; *c; c++)
97 { if (isspace((unsigned char)*c) && !isspace((unsigned char)*p))
99 if (*p == '%' && *c == 'h')
101 if (*p == '%' && *c == 'p')
106 plugin_copy_len = plugin_len + host_len * host_count + service_len * service_count;
107 plugin_copy = (char *)malloc(plugin_copy_len + 1);
110 report(stderr, GT_("fetchmail: malloc failed\n"));
114 while (plugin_copy_offset < plugin_copy_len)
115 { if ((plugin[plugin_offset] == '%') && (plugin[plugin_offset + 1] == 'h'))
116 { strcpy(plugin_copy + plugin_copy_offset, host);
118 plugin_copy_offset += host_len;
120 else if ((plugin[plugin_offset] == '%') && (plugin[plugin_offset + 1] == 'p'))
121 { strcpy(plugin_copy + plugin_copy_offset, service);
123 plugin_copy_offset += service_len;
126 { plugin_copy[plugin_copy_offset] = plugin[plugin_offset];
128 plugin_copy_offset++;
131 plugin_copy[plugin_copy_len] = 0;
133 argvec = (char **)malloc(s);
136 report(stderr, GT_("fetchmail: malloc failed\n"));
139 memset(argvec, 0, s);
140 for (p = cp = plugin_copy, i = 0; *cp; cp++)
141 { if ((!isspace((unsigned char)*cp)) && (cp == p ? 1 : isspace((unsigned char)*p))) {
147 for (cp = plugin_copy; *cp; cp++)
148 { if (isspace((unsigned char)*cp))
154 static int handle_plugin(const char *host,
155 const char *service, const char *plugin)
156 /* get a socket mediated through a given external command */
162 * The author of this code, Felix von Leitner <felix@convergence.de>, says:
163 * he chose socketpair() instead of pipe() because socketpair creates
164 * bidirectional sockets while allegedly some pipe() implementations don't.
166 if (socketpair(AF_UNIX,SOCK_STREAM,0,fds))
168 report(stderr, GT_("fetchmail: socketpair failed\n"));
174 report(stderr, GT_("fetchmail: fork failed\n"));
177 /* fds[1] is the parent's end; close it for proper EOF
179 (void) close(fds[1]);
180 if ( (dup2(fds[0],0) == -1) || (dup2(fds[0],1) == -1) ) {
181 report(stderr, GT_("dup2 failed\n"));
184 /* fds[0] is now connected to 0 and 1; close it */
185 (void) close(fds[0]);
186 if (outlevel >= O_VERBOSE)
187 report(stderr, GT_("running %s (host %s service %s)\n"), plugin, host, service);
188 argvec = parse_plugin(plugin,host,service);
189 execvp(*argvec, argvec);
190 report(stderr, GT_("execvp(%s) failed\n"), *argvec);
193 default: /* parent */
197 /* fds[0] is the child's end; close it for proper EOF detection */
198 (void) close(fds[0]);
201 #endif /* HAVE_SOCKETPAIR */
203 /** Set socket to SO_KEEPALIVE. \return 0 for success. */
204 int SockKeepalive(int sock) {
206 return setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof keepalive);
209 int UnixOpen(const char *path)
212 struct sockaddr_un ad;
213 memset(&ad, 0, sizeof(ad));
214 ad.sun_family = AF_UNIX;
215 strncpy(ad.sun_path, path, sizeof(ad.sun_path)-1);
217 sock = socket( AF_UNIX, SOCK_STREAM, 0 );
224 /* Socket opened saved. Usefull if connect timeout
225 * because it can be closed.
227 mailserver_socket_temp = sock;
229 if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
232 fm_close(sock); /* don't use SockClose, no traffic yet */
238 /* No connect timeout, then no need to set mailserver_socket_temp */
239 mailserver_socket_temp = -1;
244 int SockOpen(const char *host, const char *service,
245 const char *plugin, struct addrinfo **ai0)
247 struct addrinfo *ai, req;
250 char errbuf[8192] = "";
252 #ifdef HAVE_SOCKETPAIR
254 return handle_plugin(host,service,plugin);
255 #endif /* HAVE_SOCKETPAIR */
257 memset(&req, 0, sizeof(struct addrinfo));
258 req.ai_socktype = SOCK_STREAM;
260 req.ai_flags = AI_ADDRCONFIG;
263 i = fm_getaddrinfo(host, service, &req, ai0);
265 report(stderr, GT_("getaddrinfo(\"%s\",\"%s\") error: %s\n"),
266 host, service, gai_strerror(i));
267 if (i == EAI_SERVICE)
268 report(stderr, GT_("Try adding the --service option (see also FAQ item R12).\n"));
272 /* NOTE a Linux bug here - getaddrinfo will happily return 127.0.0.1
273 * twice if no IPv6 is configured */
275 for (ord = 0, ai = *ai0; ai; ord++, ai = ai->ai_next) {
276 char buf[256]; /* hostname */
277 char pb[256]; /* service name */
278 int gnie; /* getnameinfo result code */
280 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof(buf), NULL, 0, NI_NUMERICHOST);
282 snprintf(buf, sizeof(buf), GT_("unknown (%s)"), gai_strerror(gnie));
283 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, NULL, 0, pb, sizeof(pb), NI_NUMERICSERV);
285 snprintf(pb, sizeof(pb), GT_("unknown (%s)"), gai_strerror(gnie));
287 if (outlevel >= O_VERBOSE)
288 report_build(stdout, GT_("Trying to connect to %s/%s..."), buf, pb);
289 i = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
292 /* mask EAFNOSUPPORT errors, they confuse users for
293 * multihomed hosts */
294 if (errno != EAFNOSUPPORT)
296 if (outlevel >= O_VERBOSE)
297 report_complete(stdout, GT_("cannot create socket: %s\n"), strerror(e));
298 snprintf(errbuf+strlen(errbuf), sizeof(errbuf)-strlen(errbuf),\
299 GT_("name %d: cannot create socket family %d type %d: %s\n"), ord, ai->ai_family, ai->ai_socktype, strerror(e));
305 /* Save socket descriptor.
306 * Used to close the socket after connect timeout. */
307 mailserver_socket_temp = i;
309 if (connect(i, (struct sockaddr *) ai->ai_addr, ai->ai_addrlen) < 0) {
312 /* additionally, suppress IPv4 network unreach errors */
313 if (e != EAFNOSUPPORT)
316 if (outlevel >= O_VERBOSE)
317 report_complete(stdout, GT_("connection failed.\n"));
318 if (outlevel >= O_VERBOSE)
319 report(stderr, GT_("connection to %s:%s [%s/%s] failed: %s.\n"), host, service, buf, pb, strerror(e));
320 snprintf(errbuf+strlen(errbuf), sizeof(errbuf)-strlen(errbuf), GT_("name %d: connection to %s:%s [%s/%s] failed: %s.\n"), ord, host, service, buf, pb, strerror(e));
325 if (outlevel >= O_VERBOSE)
326 report_complete(stdout, GT_("connected.\n"));
329 /* No connect timeout, then no need to set mailserver_socket_temp */
330 mailserver_socket_temp = -1;
335 fm_freeaddrinfo(*ai0);
339 report(stderr, GT_("Connection errors for this poll:\n%s"), errbuf);
347 #if defined(HAVE_STDARG_H)
348 int SockPrintf(int sock, const char* format, ...)
351 int SockPrintf(sock,format,va_alist)
360 #if defined(HAVE_STDARG_H)
361 va_start(ap, format) ;
365 vsnprintf(buf, sizeof(buf), format, ap);
367 return SockWrite(sock, buf, strlen(buf));
372 #include <openssl/ssl.h>
373 #include <openssl/err.h>
374 #include <openssl/pem.h>
375 #include <openssl/x509v3.h>
376 #include <openssl/rand.h>
378 static SSL_CTX *_ctx[FD_SETSIZE];
379 static SSL *_ssl_context[FD_SETSIZE];
381 static SSL *SSLGetContext( int );
382 #endif /* SSL_ENABLE */
384 int SockWrite(int sock, const char *buf, int len)
394 if( NULL != ( ssl = SSLGetContext( sock ) ) )
395 n = SSL_write(ssl, buf, len);
397 #endif /* SSL_ENABLE */
398 n = fm_write(sock, buf, len);
408 int SockRead(int sock, char *buf, int len)
410 char *newline, *bp = buf;
428 * The reason for these gymnastics is that we want two things:
429 * (1) to read \n-terminated lines,
430 * (2) to return the true length of data read, even if the
431 * data coming in has embedded NULS.
434 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
436 /* OK... SSL_peek works a little different from MSG_PEEK
437 Problem is that SSL_peek can return 0 if there
438 is no data currently available. If, on the other
439 hand, we lose the socket, we also get a zero, but
440 the SSL_read then SEGFAULTS! To deal with this,
441 we'll check the error code any time we get a return
442 of zero from SSL_peek. If we have an error, we bail.
443 If we don't, we read one character in SSL_read and
444 loop. This should continue to work even if they
445 later change the behavior of SSL_peek
446 to "fix" this problem... :-( */
447 if ((n = SSL_peek(ssl, bp, len)) < 0) {
448 (void)SSL_get_error(ssl, n);
452 /* SSL_peek says no data... Does he mean no data
453 or did the connection blow up? If we got an error
455 if (0 != SSL_get_error(ssl, n)) {
458 /* We didn't get an error so read at least one
459 character at this point and loop */
461 /* Make sure newline start out NULL!
462 * We don't have a string to pass through
463 * the strchr at this point yet */
465 } else if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
466 n = newline - bp + 1;
467 /* Matthias Andree: SSL_read can return 0, in that case
468 * we must call SSL_get_error to figure if there was
469 * an error or just a "no data" condition */
470 if ((n = SSL_read(ssl, bp, n)) <= 0) {
471 if ((n = SSL_get_error(ssl, n))) {
475 /* Check for case where our single character turned out to
476 * be a newline... (It wasn't going to get caught by
477 * the strchr above if it came from the hack... ). */
478 if( NULL == newline && 1 == n && '\n' == *bp ) {
479 /* Got our newline - this will break
480 out of the loop now */
485 #endif /* SSL_ENABLE */
489 if ((n = fm_read(sock, bp, 1)) <= 0)
491 if ((n = fm_peek(sock, bp, len)) <= 0)
494 if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
495 n = newline - bp + 1;
497 if ((n = fm_read(sock, bp, n)) == -1)
499 #endif /* __BEOS__ */
510 int SockPeek(int sock)
511 /* peek at the next socket character without actually reading it */
520 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
521 n = SSL_peek(ssl, &ch, 1);
523 (void)SSL_get_error(ssl, n);
527 /* This code really needs to implement a "hold back"
528 * to simulate a functioning SSL_peek()... sigh...
529 * Has to be coordinated with the read code above.
530 * Next on the list todo... */
532 /* SSL_peek says 0... Does that mean no data
533 or did the connection blow up? If we got an error
535 if(0 != SSL_get_error(ssl, n)) {
539 /* Haven't seen this case actually occur, but...
540 if the problem in SockRead can occur, this should
541 be possible... Just not sure what to do here.
542 This should be a safe "punt" the "peek" but don't
543 "punt" the "session"... */
545 return 0; /* Give him a '\0' character */
549 #endif /* SSL_ENABLE */
550 n = fm_peek(sock, &ch, 1);
562 static char *_ssl_server_cname = NULL;
563 static int _check_fp;
564 static char *_check_digest;
565 static char *_server_label;
566 static int _depth0ck;
567 static int _firstrun;
568 static int _prev_err;
569 static int _verify_ok;
571 SSL *SSLGetContext( int sock )
573 if( sock < 0 || (unsigned)sock > FD_SETSIZE )
575 if( _ctx[sock] == NULL )
577 return _ssl_context[sock];
580 /* ok_return (preverify_ok) is 1 if this stage of certificate verification
581 passed, or 0 if it failed. This callback lets us display informative
582 errors, and perform additional validation (e.g. CN matches) */
583 static int SSL_verify_callback( int ok_return, X509_STORE_CTX *ctx, int strict )
585 #define SSLverbose (((outlevel) >= O_DEBUG) || ((outlevel) >= O_VERBOSE && (depth) == 0))
589 unsigned char digest[EVP_MAX_MD_SIZE];
590 char text[EVP_MAX_MD_SIZE * 3 + 1], *tp, *te;
591 const EVP_MD *digest_tp;
592 unsigned int dsz, esz;
593 X509_NAME *subj, *issuer;
596 x509_cert = X509_STORE_CTX_get_current_cert(ctx);
597 err = X509_STORE_CTX_get_error(ctx);
598 depth = X509_STORE_CTX_get_error_depth(ctx);
600 subj = X509_get_subject_name(x509_cert);
601 issuer = X509_get_issuer_name(x509_cert);
603 if (outlevel >= O_VERBOSE) {
604 if (depth == 0 && SSLverbose)
605 report(stderr, GT_("Server certificate:\n"));
610 report(stdout, GT_("Certificate chain, from root to peer, starting at depth %d:\n"), depth);
613 report(stdout, GT_("Certificate at depth %d:\n"), depth);
618 if ((i = X509_NAME_get_text_by_NID(issuer, NID_organizationName, buf, sizeof(buf))) != -1) {
619 report(stdout, GT_("Issuer Organization: %s\n"), (tt = sdump(buf, i)));
621 if ((size_t)i >= sizeof(buf) - 1)
622 report(stdout, GT_("Warning: Issuer Organization Name too long (possibly truncated).\n"));
624 report(stdout, GT_("Unknown Organization\n"));
625 if ((i = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, sizeof(buf))) != -1) {
626 report(stdout, GT_("Issuer CommonName: %s\n"), (tt = sdump(buf, i)));
628 if ((size_t)i >= sizeof(buf) - 1)
629 report(stdout, GT_("Warning: Issuer CommonName too long (possibly truncated).\n"));
631 report(stdout, GT_("Unknown Issuer CommonName\n"));
635 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
637 report(stdout, GT_("Subject CommonName: %s\n"), (tt = sdump(buf, i)));
640 if ((size_t)i >= sizeof(buf) - 1) {
641 /* Possible truncation. In this case, this is a DNS name, so this
642 * is really bad. We do not tolerate this even in the non-strict case. */
643 report(stderr, GT_("Bad certificate: Subject CommonName too long!\n"));
646 if ((size_t)i > strlen(buf)) {
647 /* Name contains embedded NUL characters, so we complain. This is likely
648 * a certificate spoofing attack. */
649 report(stderr, GT_("Bad certificate: Subject CommonName contains NUL, aborting!\n"));
654 if (depth == 0) { /* peer certificate */
659 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
660 if (_ssl_server_cname != NULL) {
662 char *p2 = _ssl_server_cname;
664 STACK_OF(GENERAL_NAME) *gens;
666 /* RFC 2595 section 2.4: find a matching name
667 * first find a match among alternative names */
668 gens = (STACK_OF(GENERAL_NAME) *)X509_get_ext_d2i(x509_cert, NID_subject_alt_name, NULL, NULL);
671 for (j = 0, r = sk_GENERAL_NAME_num(gens); j < r; ++j) {
672 const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, j);
673 if (gn->type == GEN_DNS) {
674 char *pp1 = (char *)gn->d.ia5->data;
675 char *pp2 = _ssl_server_cname;
676 if (outlevel >= O_VERBOSE) {
677 report(stdout, GT_("Subject Alternative Name: %s\n"), (tt = sdump(pp1, (size_t)gn->d.ia5->length)));
680 /* Name contains embedded NUL characters, so we complain. This
681 * is likely a certificate spoofing attack. */
682 if ((size_t)gn->d.ia5->length != strlen(pp1)) {
683 report(stderr, GT_("Bad certificate: Subject Alternative Name contains NUL, aborting!\n"));
684 sk_GENERAL_NAME_free(gens);
687 if (name_match(pp1, pp2)) {
692 sk_GENERAL_NAME_free(gens);
694 if (name_match(p1, p2)) {
698 if (strict || SSLverbose) {
700 GT_("Server CommonName mismatch: %s != %s\n"),
701 (tt = sdump(buf, i)), _ssl_server_cname );
706 } else if (ok_return) {
707 report(stderr, GT_("Server name not set, could not verify certificate!\n"));
708 if (strict) return (0);
711 if (outlevel >= O_VERBOSE)
712 report(stdout, GT_("Unknown Server CommonName\n"));
713 if (ok_return && strict) {
714 report(stderr, GT_("Server name not specified in certificate!\n"));
718 /* Print the finger print. Note that on errors, we might print it more than once
719 * normally; we kluge around that by using a global variable. */
720 if (_check_fp == 1) {
724 digest_tp = EVP_md5();
725 if (digest_tp == NULL) {
726 report(stderr, GT_("EVP_md5() failed!\n"));
729 if (!X509_digest(x509_cert, digest_tp, digest, &dsz)) {
730 report(stderr, GT_("Out of memory!\n"));
734 te = text + sizeof(text);
735 for (dp = 0; dp < dsz; dp++) {
736 esz = snprintf(tp, te - tp, dp > 0 ? ":%02X" : "%02X", digest[dp]);
737 if (esz >= (size_t)(te - tp)) {
738 report(stderr, GT_("Digest text buffer too small!\n"));
743 if (outlevel > O_NORMAL)
744 report(stdout, GT_("%s key fingerprint: %s\n"), _server_label, text);
745 if (_check_digest != NULL) {
746 if (strcasecmp(text, _check_digest) == 0) {
747 if (outlevel > O_NORMAL)
748 report(stdout, GT_("%s fingerprints match.\n"), _server_label);
750 report(stderr, GT_("%s fingerprints do not match!\n"), _server_label);
753 } /* if (_check_digest != NULL) */
754 } /* if (_check_fp) */
755 } /* if (depth == 0 && !_depth0ck) */
757 if (err != X509_V_OK && err != _prev_err && !(_check_fp != 0 && _check_digest && !strict)) {
760 report(stderr, GT_("Server certificate verification error: %s\n"), X509_verify_cert_error_string(err));
761 /* We gave the error code, but maybe we can add some more details for debugging */
764 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
765 X509_NAME_oneline(issuer, buf, sizeof(buf));
766 buf[sizeof(buf) - 1] = '\0';
767 report(stderr, GT_("unknown issuer (first %d characters): %s\n"), (int)(sizeof(buf)-1), buf);
768 report(stderr, GT_("This error usually happens when the server provides an incomplete certificate "
769 "chain, which is nothing fetchmail could do anything about. For details, "
770 "please see the README.SSL-SERVER document that comes with fetchmail.\n"));
772 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
773 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
774 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
775 X509_NAME_oneline(subj, buf, sizeof(buf));
776 buf[sizeof(buf) - 1] = '\0';
777 report(stderr, GT_("This means that the root signing certificate (issued for %s) is not in the "
778 "trusted CA certificate locations, or that c_rehash needs to be run "
779 "on the certificate directory. For details, please "
780 "see the documentation of --sslcertpath and --sslcertfile in the manual page.\n"), buf);
787 * If not in strict checking mode (--sslcertck), override this
788 * and pretend that verification had succeeded.
790 _verify_ok &= ok_return;
796 static int SSL_nock_verify_callback( int ok_return, X509_STORE_CTX *ctx )
798 return SSL_verify_callback(ok_return, ctx, 0);
801 static int SSL_ck_verify_callback( int ok_return, X509_STORE_CTX *ctx )
803 return SSL_verify_callback(ok_return, ctx, 1);
807 /* get commonName from certificate set in file.
808 * commonName is stored in buffer namebuffer, limited with namebufferlen
810 static const char *SSLCertGetCN(const char *mycert,
811 char *namebuffer, size_t namebufferlen)
813 const char *ret = NULL;
815 X509 *x509_cert = NULL;
816 X509_NAME *certname = NULL;
818 if (namebuffer && namebufferlen > 0) {
819 namebuffer[0] = 0x00;
820 certBio = BIO_new_file(mycert,"r");
822 x509_cert = PEM_read_bio_X509(certBio,NULL,NULL,NULL);
826 certname = X509_get_subject_name(x509_cert);
828 X509_NAME_get_text_by_NID(certname, NID_commonName,
829 namebuffer, namebufferlen) > 0)
831 X509_free(x509_cert);
837 /* performs initial SSL handshake over the connected socket
838 * uses SSL *ssl global variable, which is currently defined
841 int SSLOpen(int sock, char *mycert, char *mykey, const char *myproto, int certck,
842 char *cacertfile, char *certpath,
843 char *fingerprint, char *servercname, char *label, char **remotename)
845 struct stat randstat;
848 SSL_load_error_strings();
850 OpenSSL_add_all_algorithms(); /* see Debian Bug#576430 and manpage */
852 if (stat("/dev/random", &randstat) &&
853 stat("/dev/urandom", &randstat)) {
854 /* Neither /dev/random nor /dev/urandom are present, so add
855 entropy to the SSL PRNG a hard way. */
856 for (i = 0; i < 10000 && ! RAND_status (); ++i) {
859 gettimeofday (&tv, 0);
860 buf[0] = tv.tv_usec & 0xF;
861 buf[2] = (tv.tv_usec & 0xF0) >> 4;
862 buf[3] = (tv.tv_usec & 0xF00) >> 8;
863 buf[1] = (tv.tv_usec & 0xF000) >> 12;
864 RAND_add (buf, sizeof buf, 0.1);
868 if( sock < 0 || (unsigned)sock > FD_SETSIZE ) {
869 report(stderr, GT_("File descriptor out of range for SSL") );
873 /* Make sure a connection referring to an older context is not left */
874 _ssl_context[sock] = NULL;
876 if(!strcasecmp("ssl2",myproto)) {
877 _ctx[sock] = SSL_CTX_new(SSLv2_client_method());
878 } else if(!strcasecmp("ssl3",myproto)) {
879 _ctx[sock] = SSL_CTX_new(SSLv3_client_method());
880 } else if(!strcasecmp("tls1",myproto)) {
881 _ctx[sock] = SSL_CTX_new(TLSv1_client_method());
882 } else if (!strcasecmp("ssl23",myproto)) {
885 fprintf(stderr,GT_("Invalid SSL protocol '%s' specified, using default (SSLv23).\n"), myproto);
890 _ctx[sock] = SSL_CTX_new(SSLv23_client_method());
892 if(_ctx[sock] == NULL) {
893 ERR_print_errors_fp(stderr);
897 SSL_CTX_set_options(_ctx[sock], SSL_OP_ALL);
900 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_ck_verify_callback);
902 /* In this case, we do not fail if verification fails. However,
903 * we provide the callback for output and possible fingerprint
905 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_nock_verify_callback);
908 /* Check which trusted X.509 CA certificate store(s) to load */
911 int want_default_cacerts = 0;
913 /* Load user locations if any is given */
914 if (certpath || cacertfile)
915 SSL_CTX_load_verify_locations(_ctx[sock],
916 cacertfile, certpath);
918 want_default_cacerts = 1;
920 tmp = getenv("FETCHMAIL_INCLUDE_DEFAULT_X509_CA_CERTS");
921 if (want_default_cacerts || (tmp && tmp[0])) {
922 SSL_CTX_set_default_verify_paths(_ctx[sock]);
926 _ssl_context[sock] = SSL_new(_ctx[sock]);
928 if(_ssl_context[sock] == NULL) {
929 ERR_print_errors_fp(stderr);
930 SSL_CTX_free(_ctx[sock]);
935 /* This static is for the verify callback */
936 _ssl_server_cname = servercname;
937 _server_label = label;
939 _check_digest = fingerprint;
945 if( mycert || mykey ) {
947 /* Ok... He has a certificate file defined, so lets declare it. If
948 * he does NOT have a separate certificate and private key file then
949 * assume that it's a combined key and certificate file.
958 if ((!*remotename || !**remotename) && SSLCertGetCN(mycert, buffer, sizeof(buffer))) {
960 *remotename = xstrdup(buffer);
962 SSL_use_certificate_file(_ssl_context[sock], mycert, SSL_FILETYPE_PEM);
963 SSL_use_RSAPrivateKey_file(_ssl_context[sock], mykey, SSL_FILETYPE_PEM);
966 if (SSL_set_fd(_ssl_context[sock], sock) == 0
967 || SSL_connect(_ssl_context[sock]) < 1) {
968 ERR_print_errors_fp(stderr);
969 SSL_free( _ssl_context[sock] );
970 _ssl_context[sock] = NULL;
971 SSL_CTX_free(_ctx[sock]);
976 /* Paranoia: was the callback not called as we expected? */
978 report(stderr, GT_("Certificate/fingerprint verification was somehow skipped!\n"));
980 if (fingerprint != NULL || certck) {
981 if( NULL != SSLGetContext( sock ) ) {
982 /* Clean up the SSL stack */
983 SSL_shutdown( _ssl_context[sock] );
984 SSL_free( _ssl_context[sock] );
985 _ssl_context[sock] = NULL;
986 SSL_CTX_free(_ctx[sock]);
993 if (!certck && !fingerprint &&
994 (SSL_get_verify_result(_ssl_context[sock]) != X509_V_OK || !_verify_ok)) {
995 report(stderr, GT_("Warning: the connection is insecure, continuing anyways. (Better use --sslcertck!)\n"));
1002 int SockClose(int sock)
1003 /* close a socket gracefully */
1006 if( NULL != SSLGetContext( sock ) ) {
1007 /* Clean up the SSL stack */
1008 SSL_shutdown( _ssl_context[sock] );
1009 SSL_free( _ssl_context[sock] );
1010 _ssl_context[sock] = NULL;
1011 SSL_CTX_free(_ctx[sock]);
1016 /* if there's an error closing at this point, not much we can do */
1017 return(fm_close(sock)); /* this is guarded */
1022 * Workaround Microsoft Winsock recv/WSARecv(..., MSG_PEEK) bug.
1023 * See http://sources.redhat.com/ml/cygwin/2001-08/msg00628.html
1026 static ssize_t cygwin_read(int sock, void *buf, size_t count)
1028 char *bp = (char *)buf;
1031 if ((n = read(sock, bp, count)) == (size_t)-1)
1036 if (outlevel >= O_VERBOSE)
1037 report(stdout, GT_("Cygwin socket read retry\n"));
1038 n2 = read(sock, bp + n, count - n);
1039 if (n2 == (size_t)-1 || n + n2 != count) {
1040 report(stderr, GT_("Cygwin socket read retry failed!\n"));
1047 #endif /* __CYGWIN__ */