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 void report_SSL_errors(FILE *stream)
382 while (0ul != (err = ERR_get_error())) {
383 char *errstr = ERR_error_string(err, NULL);
384 report(stream, GT_("OpenSSL reported: %s\n"), errstr);
388 /* override ERR_print_errors_fp to our own implementation */
389 #undef ERR_print_errors_fp
390 #define ERR_print_errors_fp(stream) report_SSL_errors((stream))
392 static SSL_CTX *_ctx[FD_SETSIZE];
393 static SSL *_ssl_context[FD_SETSIZE];
395 static SSL *SSLGetContext( int );
396 #endif /* SSL_ENABLE */
398 int SockWrite(int sock, const char *buf, int len)
408 if( NULL != ( ssl = SSLGetContext( sock ) ) )
409 n = SSL_write(ssl, buf, len);
411 #endif /* SSL_ENABLE */
412 n = fm_write(sock, buf, len);
422 int SockRead(int sock, char *buf, int len)
424 char *newline, *bp = buf;
442 * The reason for these gymnastics is that we want two things:
443 * (1) to read \n-terminated lines,
444 * (2) to return the true length of data read, even if the
445 * data coming in has embedded NULS.
448 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
450 /* OK... SSL_peek works a little different from MSG_PEEK
451 Problem is that SSL_peek can return 0 if there
452 is no data currently available. If, on the other
453 hand, we lose the socket, we also get a zero, but
454 the SSL_read then SEGFAULTS! To deal with this,
455 we'll check the error code any time we get a return
456 of zero from SSL_peek. If we have an error, we bail.
457 If we don't, we read one character in SSL_read and
458 loop. This should continue to work even if they
459 later change the behavior of SSL_peek
460 to "fix" this problem... :-( */
461 if ((n = SSL_peek(ssl, bp, len)) < 0) {
462 (void)SSL_get_error(ssl, n);
466 /* SSL_peek says no data... Does he mean no data
467 or did the connection blow up? If we got an error
469 if (0 != SSL_get_error(ssl, n)) {
472 /* We didn't get an error so read at least one
473 character at this point and loop */
475 /* Make sure newline start out NULL!
476 * We don't have a string to pass through
477 * the strchr at this point yet */
479 } else if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
480 n = newline - bp + 1;
481 /* Matthias Andree: SSL_read can return 0, in that case
482 * we must call SSL_get_error to figure if there was
483 * an error or just a "no data" condition */
484 if ((n = SSL_read(ssl, bp, n)) <= 0) {
485 if ((n = SSL_get_error(ssl, n))) {
489 /* Check for case where our single character turned out to
490 * be a newline... (It wasn't going to get caught by
491 * the strchr above if it came from the hack... ). */
492 if( NULL == newline && 1 == n && '\n' == *bp ) {
493 /* Got our newline - this will break
494 out of the loop now */
499 #endif /* SSL_ENABLE */
503 if ((n = fm_read(sock, bp, 1)) <= 0)
505 if ((n = fm_peek(sock, bp, len)) <= 0)
508 if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
509 n = newline - bp + 1;
511 if ((n = fm_read(sock, bp, n)) == -1)
513 #endif /* __BEOS__ */
524 int SockPeek(int sock)
525 /* peek at the next socket character without actually reading it */
534 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
535 n = SSL_peek(ssl, &ch, 1);
537 (void)SSL_get_error(ssl, n);
541 /* This code really needs to implement a "hold back"
542 * to simulate a functioning SSL_peek()... sigh...
543 * Has to be coordinated with the read code above.
544 * Next on the list todo... */
546 /* SSL_peek says 0... Does that mean no data
547 or did the connection blow up? If we got an error
549 if(0 != SSL_get_error(ssl, n)) {
553 /* Haven't seen this case actually occur, but...
554 if the problem in SockRead can occur, this should
555 be possible... Just not sure what to do here.
556 This should be a safe "punt" the "peek" but don't
557 "punt" the "session"... */
559 return 0; /* Give him a '\0' character */
563 #endif /* SSL_ENABLE */
564 n = fm_peek(sock, &ch, 1);
576 static char *_ssl_server_cname = NULL;
577 static int _check_fp;
578 static char *_check_digest;
579 static char *_server_label;
580 static int _depth0ck;
581 static int _firstrun;
582 static int _prev_err;
583 static int _verify_ok;
585 SSL *SSLGetContext( int sock )
587 if( sock < 0 || (unsigned)sock > FD_SETSIZE )
589 if( _ctx[sock] == NULL )
591 return _ssl_context[sock];
594 /* ok_return (preverify_ok) is 1 if this stage of certificate verification
595 passed, or 0 if it failed. This callback lets us display informative
596 errors, and perform additional validation (e.g. CN matches) */
597 static int SSL_verify_callback( int ok_return, X509_STORE_CTX *ctx, int strict )
599 #define SSLverbose (((outlevel) >= O_DEBUG) || ((outlevel) >= O_VERBOSE && (depth) == 0))
603 unsigned char digest[EVP_MAX_MD_SIZE];
604 char text[EVP_MAX_MD_SIZE * 3 + 1], *tp, *te;
605 const EVP_MD *digest_tp;
606 unsigned int dsz, esz;
607 X509_NAME *subj, *issuer;
610 x509_cert = X509_STORE_CTX_get_current_cert(ctx);
611 err = X509_STORE_CTX_get_error(ctx);
612 depth = X509_STORE_CTX_get_error_depth(ctx);
614 subj = X509_get_subject_name(x509_cert);
615 issuer = X509_get_issuer_name(x509_cert);
617 if (outlevel >= O_VERBOSE) {
618 if (depth == 0 && SSLverbose)
619 report(stdout, GT_("Server certificate:\n"));
624 report(stdout, GT_("Certificate chain, from root to peer, starting at depth %d:\n"), depth);
627 report(stdout, GT_("Certificate at depth %d:\n"), depth);
632 if ((i = X509_NAME_get_text_by_NID(issuer, NID_organizationName, buf, sizeof(buf))) != -1) {
633 report(stdout, GT_("Issuer Organization: %s\n"), (tt = sdump(buf, i)));
635 if ((size_t)i >= sizeof(buf) - 1)
636 report(stdout, GT_("Warning: Issuer Organization Name too long (possibly truncated).\n"));
638 report(stdout, GT_("Unknown Organization\n"));
639 if ((i = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, sizeof(buf))) != -1) {
640 report(stdout, GT_("Issuer CommonName: %s\n"), (tt = sdump(buf, i)));
642 if ((size_t)i >= sizeof(buf) - 1)
643 report(stdout, GT_("Warning: Issuer CommonName too long (possibly truncated).\n"));
645 report(stdout, GT_("Unknown Issuer CommonName\n"));
649 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
651 report(stdout, GT_("Subject CommonName: %s\n"), (tt = sdump(buf, i)));
654 if ((size_t)i >= sizeof(buf) - 1) {
655 /* Possible truncation. In this case, this is a DNS name, so this
656 * is really bad. We do not tolerate this even in the non-strict case. */
657 report(stderr, GT_("Bad certificate: Subject CommonName too long!\n"));
660 if ((size_t)i > strlen(buf)) {
661 /* Name contains embedded NUL characters, so we complain. This is likely
662 * a certificate spoofing attack. */
663 report(stderr, GT_("Bad certificate: Subject CommonName contains NUL, aborting!\n"));
668 if (depth == 0) { /* peer certificate */
673 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
674 if (_ssl_server_cname != NULL) {
676 char *p2 = _ssl_server_cname;
678 STACK_OF(GENERAL_NAME) *gens;
680 /* RFC 2595 section 2.4: find a matching name
681 * first find a match among alternative names */
682 gens = (STACK_OF(GENERAL_NAME) *)X509_get_ext_d2i(x509_cert, NID_subject_alt_name, NULL, NULL);
685 for (j = 0, r = sk_GENERAL_NAME_num(gens); j < r; ++j) {
686 const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, j);
687 if (gn->type == GEN_DNS) {
688 char *pp1 = (char *)gn->d.ia5->data;
689 char *pp2 = _ssl_server_cname;
690 if (outlevel >= O_VERBOSE) {
691 report(stdout, GT_("Subject Alternative Name: %s\n"), (tt = sdump(pp1, (size_t)gn->d.ia5->length)));
694 /* Name contains embedded NUL characters, so we complain. This
695 * is likely a certificate spoofing attack. */
696 if ((size_t)gn->d.ia5->length != strlen(pp1)) {
697 report(stderr, GT_("Bad certificate: Subject Alternative Name contains NUL, aborting!\n"));
698 sk_GENERAL_NAME_free(gens);
701 if (name_match(pp1, pp2)) {
706 GENERAL_NAMES_free(gens);
708 if (name_match(p1, p2)) {
712 if (strict || SSLverbose) {
714 GT_("Server CommonName mismatch: %s != %s\n"),
715 (tt = sdump(buf, i)), _ssl_server_cname );
720 } else if (ok_return) {
721 report(stderr, GT_("Server name not set, could not verify certificate!\n"));
722 if (strict) return (0);
725 if (outlevel >= O_VERBOSE)
726 report(stdout, GT_("Unknown Server CommonName\n"));
727 if (ok_return && strict) {
728 report(stderr, GT_("Server name not specified in certificate!\n"));
732 /* Print the finger print. Note that on errors, we might print it more than once
733 * normally; we kluge around that by using a global variable. */
734 if (_check_fp == 1) {
738 digest_tp = EVP_md5();
739 if (digest_tp == NULL) {
740 report(stderr, GT_("EVP_md5() failed!\n"));
743 if (!X509_digest(x509_cert, digest_tp, digest, &dsz)) {
744 report(stderr, GT_("Out of memory!\n"));
748 te = text + sizeof(text);
749 for (dp = 0; dp < dsz; dp++) {
750 esz = snprintf(tp, te - tp, dp > 0 ? ":%02X" : "%02X", digest[dp]);
751 if (esz >= (size_t)(te - tp)) {
752 report(stderr, GT_("Digest text buffer too small!\n"));
757 if (outlevel > O_NORMAL)
758 report(stdout, GT_("%s key fingerprint: %s\n"), _server_label, text);
759 if (_check_digest != NULL) {
760 if (strcasecmp(text, _check_digest) == 0) {
761 if (outlevel > O_NORMAL)
762 report(stdout, GT_("%s fingerprints match.\n"), _server_label);
764 report(stderr, GT_("%s fingerprints do not match!\n"), _server_label);
767 } /* if (_check_digest != NULL) */
768 } /* if (_check_fp) */
769 } /* if (depth == 0 && !_depth0ck) */
771 if (err != X509_V_OK && err != _prev_err && !(_check_fp != 0 && _check_digest && !strict)) {
776 report(stderr, GT_("Server certificate verification error: %s\n"), X509_verify_cert_error_string(err));
777 /* We gave the error code, but maybe we can add some more details for debugging */
780 /* actually we do not want to lump these together, but
781 * since OpenSSL flipped the meaning of these error
782 * codes in the past, and they do hardly make a
783 * practical difference because servers need not provide
784 * the root signing certificate, we don't bother telling
785 * users the difference:
787 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
788 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
789 X509_NAME_oneline(issuer, buf, sizeof(buf));
790 buf[sizeof(buf) - 1] = '\0';
791 report(stderr, GT_("Broken certification chain at: %s\n"), (tmp = sdump(buf, strlen(buf))));
793 report(stderr, GT_( "This could mean that the server did not provide the intermediate CA's certificate(s), "
794 "which is nothing fetchmail could do anything about. For details, "
795 "please see the README.SSL-SERVER document that ships with fetchmail.\n"));
798 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
799 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
801 X509_NAME_oneline(issuer, buf, sizeof(buf));
802 buf[sizeof(buf) - 1] = '\0';
803 report(stderr, GT_("Missing trust anchor certificate: %s\n"), (tmp = sdump(buf, strlen(buf))));
806 report(stderr, GT_( "This could mean that the root CA's signing certificate is not in the "
807 "trusted CA certificate location, or that c_rehash needs to be run "
808 "on the certificate directory. For details, please "
809 "see the documentation of --sslcertpath and --sslcertfile in the manual page.\n"));
816 * If not in strict checking mode (--sslcertck), override this
817 * and pretend that verification had succeeded.
819 _verify_ok &= ok_return;
825 static int SSL_nock_verify_callback( int ok_return, X509_STORE_CTX *ctx )
827 return SSL_verify_callback(ok_return, ctx, 0);
830 static int SSL_ck_verify_callback( int ok_return, X509_STORE_CTX *ctx )
832 return SSL_verify_callback(ok_return, ctx, 1);
836 /* get commonName from certificate set in file.
837 * commonName is stored in buffer namebuffer, limited with namebufferlen
839 static const char *SSLCertGetCN(const char *mycert,
840 char *namebuffer, size_t namebufferlen)
842 const char *ret = NULL;
844 X509 *x509_cert = NULL;
845 X509_NAME *certname = NULL;
847 if (namebuffer && namebufferlen > 0) {
848 namebuffer[0] = 0x00;
849 certBio = BIO_new_file(mycert,"r");
851 x509_cert = PEM_read_bio_X509(certBio,NULL,NULL,NULL);
855 certname = X509_get_subject_name(x509_cert);
857 X509_NAME_get_text_by_NID(certname, NID_commonName,
858 namebuffer, namebufferlen) > 0)
860 X509_free(x509_cert);
866 /* performs initial SSL handshake over the connected socket
867 * uses SSL *ssl global variable, which is currently defined
870 int SSLOpen(int sock, char *mycert, char *mykey, const char *myproto, int certck,
871 char *cacertfile, char *certpath,
872 char *fingerprint, char *servercname, char *label, char **remotename)
874 struct stat randstat;
876 long sslopts = SSL_OP_ALL;
878 SSL_load_error_strings();
880 OpenSSL_add_all_algorithms(); /* see Debian Bug#576430 and manpage */
882 if (stat("/dev/random", &randstat) &&
883 stat("/dev/urandom", &randstat)) {
884 /* Neither /dev/random nor /dev/urandom are present, so add
885 entropy to the SSL PRNG a hard way. */
886 for (i = 0; i < 10000 && ! RAND_status (); ++i) {
889 gettimeofday (&tv, 0);
890 buf[0] = tv.tv_usec & 0xF;
891 buf[2] = (tv.tv_usec & 0xF0) >> 4;
892 buf[3] = (tv.tv_usec & 0xF00) >> 8;
893 buf[1] = (tv.tv_usec & 0xF000) >> 12;
894 RAND_add (buf, sizeof buf, 0.1);
898 if( sock < 0 || (unsigned)sock > FD_SETSIZE ) {
899 report(stderr, GT_("File descriptor out of range for SSL") );
903 /* Make sure a connection referring to an older context is not left */
904 _ssl_context[sock] = NULL;
906 if(!strcasecmp("ssl2",myproto)) {
907 #if HAVE_DECL_SSLV2_CLIENT_METHOD + 0 > 0
908 _ctx[sock] = SSL_CTX_new(SSLv2_client_method());
910 report(stderr, GT_("Your operating system does not support SSLv2.\n"));
913 } else if(!strcasecmp("ssl3",myproto)) {
914 _ctx[sock] = SSL_CTX_new(SSLv3_client_method());
915 } else if(!strcasecmp("tls1",myproto)) {
916 _ctx[sock] = SSL_CTX_new(TLSv1_client_method());
917 } else if (!strcasecmp("ssl23",myproto)) {
920 report(stderr,GT_("Invalid SSL protocol '%s' specified, using default (SSLv23).\n"), myproto);
925 _ctx[sock] = SSL_CTX_new(SSLv23_client_method());
927 if(_ctx[sock] == NULL) {
928 ERR_print_errors_fp(stderr);
933 char *tmp = getenv("FETCHMAIL_DISABLE_CBC_IV_COUNTERMEASURE");
934 if (tmp == NULL || *tmp == '\0' || strspn(tmp, " \t") == strlen(tmp))
935 sslopts &= ~ SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
938 SSL_CTX_set_options(_ctx[sock], sslopts);
941 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_ck_verify_callback);
943 /* In this case, we do not fail if verification fails. However,
944 * we provide the callback for output and possible fingerprint
946 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_nock_verify_callback);
949 /* Check which trusted X.509 CA certificate store(s) to load */
952 int want_default_cacerts = 0;
954 /* Load user locations if any is given */
955 if (certpath || cacertfile)
956 SSL_CTX_load_verify_locations(_ctx[sock],
957 cacertfile, certpath);
959 want_default_cacerts = 1;
961 tmp = getenv("FETCHMAIL_INCLUDE_DEFAULT_X509_CA_CERTS");
962 if (want_default_cacerts || (tmp && tmp[0])) {
963 SSL_CTX_set_default_verify_paths(_ctx[sock]);
967 _ssl_context[sock] = SSL_new(_ctx[sock]);
969 if(_ssl_context[sock] == NULL) {
970 ERR_print_errors_fp(stderr);
971 SSL_CTX_free(_ctx[sock]);
976 /* This static is for the verify callback */
977 _ssl_server_cname = servercname;
978 _server_label = label;
980 _check_digest = fingerprint;
986 if( mycert || mykey ) {
988 /* Ok... He has a certificate file defined, so lets declare it. If
989 * he does NOT have a separate certificate and private key file then
990 * assume that it's a combined key and certificate file.
999 if ((!*remotename || !**remotename) && SSLCertGetCN(mycert, buffer, sizeof(buffer))) {
1001 *remotename = xstrdup(buffer);
1003 SSL_use_certificate_file(_ssl_context[sock], mycert, SSL_FILETYPE_PEM);
1004 SSL_use_RSAPrivateKey_file(_ssl_context[sock], mykey, SSL_FILETYPE_PEM);
1007 if (SSL_set_fd(_ssl_context[sock], sock) == 0
1008 || SSL_connect(_ssl_context[sock]) < 1) {
1009 ERR_print_errors_fp(stderr);
1010 SSL_free( _ssl_context[sock] );
1011 _ssl_context[sock] = NULL;
1012 SSL_CTX_free(_ctx[sock]);
1017 /* Paranoia: was the callback not called as we expected? */
1019 report(stderr, GT_("Certificate/fingerprint verification was somehow skipped!\n"));
1021 if (fingerprint != NULL || certck) {
1022 if( NULL != SSLGetContext( sock ) ) {
1023 /* Clean up the SSL stack */
1024 SSL_shutdown( _ssl_context[sock] );
1025 SSL_free( _ssl_context[sock] );
1026 _ssl_context[sock] = NULL;
1027 SSL_CTX_free(_ctx[sock]);
1034 if (!certck && !fingerprint &&
1035 (SSL_get_verify_result(_ssl_context[sock]) != X509_V_OK || !_verify_ok)) {
1036 report(stderr, GT_("Warning: the connection is insecure, continuing anyways. (Better use --sslcertck!)\n"));
1043 int SockClose(int sock)
1044 /* close a socket gracefully */
1047 if( NULL != SSLGetContext( sock ) ) {
1048 /* Clean up the SSL stack */
1049 SSL_shutdown( _ssl_context[sock] );
1050 SSL_free( _ssl_context[sock] );
1051 _ssl_context[sock] = NULL;
1052 SSL_CTX_free(_ctx[sock]);
1057 /* if there's an error closing at this point, not much we can do */
1058 return(fm_close(sock)); /* this is guarded */
1063 * Workaround Microsoft Winsock recv/WSARecv(..., MSG_PEEK) bug.
1064 * See http://sources.redhat.com/ml/cygwin/2001-08/msg00628.html
1067 static ssize_t cygwin_read(int sock, void *buf, size_t count)
1069 char *bp = (char *)buf;
1072 if ((n = read(sock, bp, count)) == (size_t)-1)
1077 if (outlevel >= O_VERBOSE)
1078 report(stdout, GT_("Cygwin socket read retry\n"));
1079 n2 = read(sock, bp + n, count - n);
1080 if (n2 == (size_t)-1 || n + n2 != count) {
1081 report(stderr, GT_("Cygwin socket read retry failed!\n"));
1088 #endif /* __CYGWIN__ */