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);
137 report(stderr, GT_("fetchmail: malloc failed\n"));
140 memset(argvec, 0, s);
141 for (p = cp = plugin_copy, i = 0; *cp; cp++)
142 { if ((!isspace((unsigned char)*cp)) && (cp == p ? 1 : isspace((unsigned char)*p))) {
148 for (cp = plugin_copy; *cp; cp++)
149 { if (isspace((unsigned char)*cp))
155 static int handle_plugin(const char *host,
156 const char *service, const char *plugin)
157 /* get a socket mediated through a given external command */
163 * The author of this code, Felix von Leitner <felix@convergence.de>, says:
164 * he chose socketpair() instead of pipe() because socketpair creates
165 * bidirectional sockets while allegedly some pipe() implementations don't.
167 if (socketpair(AF_UNIX,SOCK_STREAM,0,fds))
169 report(stderr, GT_("fetchmail: socketpair failed\n"));
175 report(stderr, GT_("fetchmail: fork failed\n"));
178 /* fds[1] is the parent's end; close it for proper EOF
180 (void) close(fds[1]);
181 if ( (dup2(fds[0],0) == -1) || (dup2(fds[0],1) == -1) ) {
182 report(stderr, GT_("dup2 failed\n"));
185 /* fds[0] is now connected to 0 and 1; close it */
186 (void) close(fds[0]);
187 if (outlevel >= O_VERBOSE)
188 report(stderr, GT_("running %s (host %s service %s)\n"), plugin, host, service);
189 argvec = parse_plugin(plugin,host,service);
192 execvp(*argvec, argvec);
193 report(stderr, GT_("execvp(%s) failed\n"), *argvec);
196 default: /* parent */
200 /* fds[0] is the child's end; close it for proper EOF detection */
201 (void) close(fds[0]);
204 #endif /* HAVE_SOCKETPAIR */
206 /** Set socket to SO_KEEPALIVE. \return 0 for success. */
207 int SockKeepalive(int sock) {
209 return setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof keepalive);
212 int UnixOpen(const char *path)
215 struct sockaddr_un ad;
216 memset(&ad, 0, sizeof(ad));
217 ad.sun_family = AF_UNIX;
218 strncpy(ad.sun_path, path, sizeof(ad.sun_path)-1);
220 sock = socket( AF_UNIX, SOCK_STREAM, 0 );
227 /* Socket opened saved. Usefull if connect timeout
228 * because it can be closed.
230 mailserver_socket_temp = sock;
232 if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
235 fm_close(sock); /* don't use SockClose, no traffic yet */
241 /* No connect timeout, then no need to set mailserver_socket_temp */
242 mailserver_socket_temp = -1;
247 int SockOpen(const char *host, const char *service,
248 const char *plugin, struct addrinfo **ai0)
250 struct addrinfo *ai, req;
253 char errbuf[8192] = "";
255 #ifdef HAVE_SOCKETPAIR
257 return handle_plugin(host,service,plugin);
258 #endif /* HAVE_SOCKETPAIR */
260 memset(&req, 0, sizeof(struct addrinfo));
261 req.ai_socktype = SOCK_STREAM;
263 req.ai_flags = AI_ADDRCONFIG;
266 i = fm_getaddrinfo(host, service, &req, ai0);
268 report(stderr, GT_("getaddrinfo(\"%s\",\"%s\") error: %s\n"),
269 host, service, gai_strerror(i));
270 if (i == EAI_SERVICE)
271 report(stderr, GT_("Try adding the --service option (see also FAQ item R12).\n"));
275 /* NOTE a Linux bug here - getaddrinfo will happily return 127.0.0.1
276 * twice if no IPv6 is configured */
278 for (ord = 0, ai = *ai0; ai; ord++, ai = ai->ai_next) {
279 char buf[256]; /* hostname */
280 char pb[256]; /* service name */
281 int gnie; /* getnameinfo result code */
283 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof(buf), NULL, 0, NI_NUMERICHOST);
285 snprintf(buf, sizeof(buf), GT_("unknown (%s)"), gai_strerror(gnie));
286 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, NULL, 0, pb, sizeof(pb), NI_NUMERICSERV);
288 snprintf(pb, sizeof(pb), GT_("unknown (%s)"), gai_strerror(gnie));
290 if (outlevel >= O_VERBOSE)
291 report_build(stdout, GT_("Trying to connect to %s/%s..."), buf, pb);
292 i = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
295 /* mask EAFNOSUPPORT errors, they confuse users for
296 * multihomed hosts */
297 if (errno != EAFNOSUPPORT)
299 if (outlevel >= O_VERBOSE)
300 report_complete(stdout, GT_("cannot create socket: %s\n"), strerror(e));
301 snprintf(errbuf+strlen(errbuf), sizeof(errbuf)-strlen(errbuf),\
302 GT_("name %d: cannot create socket family %d type %d: %s\n"), ord, ai->ai_family, ai->ai_socktype, strerror(e));
308 /* Save socket descriptor.
309 * Used to close the socket after connect timeout. */
310 mailserver_socket_temp = i;
312 if (connect(i, (struct sockaddr *) ai->ai_addr, ai->ai_addrlen) < 0) {
315 /* additionally, suppress IPv4 network unreach errors */
316 if (e != EAFNOSUPPORT)
319 if (outlevel >= O_VERBOSE)
320 report_complete(stdout, GT_("connection failed.\n"));
321 if (outlevel >= O_VERBOSE)
322 report(stderr, GT_("connection to %s:%s [%s/%s] failed: %s.\n"), host, service, buf, pb, strerror(e));
323 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));
328 if (outlevel >= O_VERBOSE)
329 report_complete(stdout, GT_("connected.\n"));
332 /* No connect timeout, then no need to set mailserver_socket_temp */
333 mailserver_socket_temp = -1;
338 fm_freeaddrinfo(*ai0);
342 report(stderr, GT_("Connection errors for this poll:\n%s"), errbuf);
350 #if defined(HAVE_STDARG_H)
351 int SockPrintf(int sock, const char* format, ...)
354 int SockPrintf(sock,format,va_alist)
363 #if defined(HAVE_STDARG_H)
364 va_start(ap, format) ;
368 vsnprintf(buf, sizeof(buf), format, ap);
370 return SockWrite(sock, buf, strlen(buf));
375 #include <openssl/ssl.h>
376 #include <openssl/err.h>
377 #include <openssl/pem.h>
378 #include <openssl/x509v3.h>
379 #include <openssl/rand.h>
381 static void report_SSL_errors(FILE *stream)
385 while (0ul != (err = ERR_get_error())) {
386 char *errstr = ERR_error_string(err, NULL);
387 report(stream, GT_("OpenSSL reported: %s\n"), errstr);
391 /* override ERR_print_errors_fp to our own implementation */
392 #undef ERR_print_errors_fp
393 #define ERR_print_errors_fp(stream) report_SSL_errors((stream))
395 static SSL_CTX *_ctx[FD_SETSIZE];
396 static SSL *_ssl_context[FD_SETSIZE];
398 static SSL *SSLGetContext( int );
399 #endif /* SSL_ENABLE */
401 int SockWrite(int sock, const char *buf, int len)
411 if( NULL != ( ssl = SSLGetContext( sock ) ) )
412 n = SSL_write(ssl, buf, len);
414 #endif /* SSL_ENABLE */
415 n = fm_write(sock, buf, len);
425 int SockRead(int sock, char *buf, int len)
427 char *newline, *bp = buf;
445 * The reason for these gymnastics is that we want two things:
446 * (1) to read \n-terminated lines,
447 * (2) to return the true length of data read, even if the
448 * data coming in has embedded NULS.
451 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
453 /* OK... SSL_peek works a little different from MSG_PEEK
454 Problem is that SSL_peek can return 0 if there
455 is no data currently available. If, on the other
456 hand, we lose the socket, we also get a zero, but
457 the SSL_read then SEGFAULTS! To deal with this,
458 we'll check the error code any time we get a return
459 of zero from SSL_peek. If we have an error, we bail.
460 If we don't, we read one character in SSL_read and
461 loop. This should continue to work even if they
462 later change the behavior of SSL_peek
463 to "fix" this problem... :-( */
464 if ((n = SSL_peek(ssl, bp, len)) < 0) {
465 (void)SSL_get_error(ssl, n);
469 /* SSL_peek says no data... Does he mean no data
470 or did the connection blow up? If we got an error
472 if (0 != SSL_get_error(ssl, n)) {
475 /* We didn't get an error so read at least one
476 character at this point and loop */
478 /* Make sure newline start out NULL!
479 * We don't have a string to pass through
480 * the strchr at this point yet */
482 } else if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
483 n = newline - bp + 1;
484 /* Matthias Andree: SSL_read can return 0, in that case
485 * we must call SSL_get_error to figure if there was
486 * an error or just a "no data" condition */
487 if ((n = SSL_read(ssl, bp, n)) <= 0) {
488 if ((n = SSL_get_error(ssl, n))) {
492 /* Check for case where our single character turned out to
493 * be a newline... (It wasn't going to get caught by
494 * the strchr above if it came from the hack... ). */
495 if( NULL == newline && 1 == n && '\n' == *bp ) {
496 /* Got our newline - this will break
497 out of the loop now */
502 #endif /* SSL_ENABLE */
506 if ((n = fm_read(sock, bp, 1)) <= 0)
508 if ((n = fm_peek(sock, bp, len)) <= 0)
511 if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
512 n = newline - bp + 1;
514 if ((n = fm_read(sock, bp, n)) == -1)
516 #endif /* __BEOS__ */
527 int SockPeek(int sock)
528 /* peek at the next socket character without actually reading it */
537 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
538 n = SSL_peek(ssl, &ch, 1);
540 (void)SSL_get_error(ssl, n);
544 /* This code really needs to implement a "hold back"
545 * to simulate a functioning SSL_peek()... sigh...
546 * Has to be coordinated with the read code above.
547 * Next on the list todo... */
549 /* SSL_peek says 0... Does that mean no data
550 or did the connection blow up? If we got an error
552 if(0 != SSL_get_error(ssl, n)) {
556 /* Haven't seen this case actually occur, but...
557 if the problem in SockRead can occur, this should
558 be possible... Just not sure what to do here.
559 This should be a safe "punt" the "peek" but don't
560 "punt" the "session"... */
562 return 0; /* Give him a '\0' character */
566 #endif /* SSL_ENABLE */
567 n = fm_peek(sock, &ch, 1);
579 static char *_ssl_server_cname = NULL;
580 static int _check_fp;
581 static char *_check_digest;
582 static char *_server_label;
583 static int _depth0ck;
584 static int _firstrun;
585 static int _prev_err;
586 static int _verify_ok;
588 SSL *SSLGetContext( int sock )
590 if( sock < 0 || (unsigned)sock > FD_SETSIZE )
592 if( _ctx[sock] == NULL )
594 return _ssl_context[sock];
597 /* ok_return (preverify_ok) is 1 if this stage of certificate verification
598 passed, or 0 if it failed. This callback lets us display informative
599 errors, and perform additional validation (e.g. CN matches) */
600 static int SSL_verify_callback( int ok_return, X509_STORE_CTX *ctx, int strict )
602 #define SSLverbose (((outlevel) >= O_DEBUG) || ((outlevel) >= O_VERBOSE && (depth) == 0))
606 unsigned char digest[EVP_MAX_MD_SIZE];
607 char text[EVP_MAX_MD_SIZE * 3 + 1], *tp, *te;
608 const EVP_MD *digest_tp;
609 unsigned int dsz, esz;
610 X509_NAME *subj, *issuer;
613 x509_cert = X509_STORE_CTX_get_current_cert(ctx);
614 err = X509_STORE_CTX_get_error(ctx);
615 depth = X509_STORE_CTX_get_error_depth(ctx);
617 subj = X509_get_subject_name(x509_cert);
618 issuer = X509_get_issuer_name(x509_cert);
620 if (outlevel >= O_VERBOSE) {
621 if (depth == 0 && SSLverbose)
622 report(stdout, GT_("Server certificate:\n"));
627 report(stdout, GT_("Certificate chain, from root to peer, starting at depth %d:\n"), depth);
630 report(stdout, GT_("Certificate at depth %d:\n"), depth);
635 if ((i = X509_NAME_get_text_by_NID(issuer, NID_organizationName, buf, sizeof(buf))) != -1) {
636 report(stdout, GT_("Issuer Organization: %s\n"), (tt = sdump(buf, i)));
638 if ((size_t)i >= sizeof(buf) - 1)
639 report(stdout, GT_("Warning: Issuer Organization Name too long (possibly truncated).\n"));
641 report(stdout, GT_("Unknown Organization\n"));
642 if ((i = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, sizeof(buf))) != -1) {
643 report(stdout, GT_("Issuer CommonName: %s\n"), (tt = sdump(buf, i)));
645 if ((size_t)i >= sizeof(buf) - 1)
646 report(stdout, GT_("Warning: Issuer CommonName too long (possibly truncated).\n"));
648 report(stdout, GT_("Unknown Issuer CommonName\n"));
652 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
654 report(stdout, GT_("Subject CommonName: %s\n"), (tt = sdump(buf, i)));
657 if ((size_t)i >= sizeof(buf) - 1) {
658 /* Possible truncation. In this case, this is a DNS name, so this
659 * is really bad. We do not tolerate this even in the non-strict case. */
660 report(stderr, GT_("Bad certificate: Subject CommonName too long!\n"));
663 if ((size_t)i > strlen(buf)) {
664 /* Name contains embedded NUL characters, so we complain. This is likely
665 * a certificate spoofing attack. */
666 report(stderr, GT_("Bad certificate: Subject CommonName contains NUL, aborting!\n"));
671 if (depth == 0) { /* peer certificate */
676 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
677 if (_ssl_server_cname != NULL) {
679 char *p2 = _ssl_server_cname;
681 STACK_OF(GENERAL_NAME) *gens;
683 /* RFC 2595 section 2.4: find a matching name
684 * first find a match among alternative names */
685 gens = (STACK_OF(GENERAL_NAME) *)X509_get_ext_d2i(x509_cert, NID_subject_alt_name, NULL, NULL);
688 for (j = 0, r = sk_GENERAL_NAME_num(gens); j < r; ++j) {
689 const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, j);
690 if (gn->type == GEN_DNS) {
691 char *pp1 = (char *)gn->d.ia5->data;
692 char *pp2 = _ssl_server_cname;
693 if (outlevel >= O_VERBOSE) {
694 report(stdout, GT_("Subject Alternative Name: %s\n"), (tt = sdump(pp1, (size_t)gn->d.ia5->length)));
697 /* Name contains embedded NUL characters, so we complain. This
698 * is likely a certificate spoofing attack. */
699 if ((size_t)gn->d.ia5->length != strlen(pp1)) {
700 report(stderr, GT_("Bad certificate: Subject Alternative Name contains NUL, aborting!\n"));
701 sk_GENERAL_NAME_free(gens);
704 if (name_match(pp1, pp2)) {
709 GENERAL_NAMES_free(gens);
711 if (name_match(p1, p2)) {
715 if (strict || SSLverbose) {
717 GT_("Server CommonName mismatch: %s != %s\n"),
718 (tt = sdump(buf, i)), _ssl_server_cname );
723 } else if (ok_return) {
724 report(stderr, GT_("Server name not set, could not verify certificate!\n"));
725 if (strict) return (0);
728 if (outlevel >= O_VERBOSE)
729 report(stdout, GT_("Unknown Server CommonName\n"));
730 if (ok_return && strict) {
731 report(stderr, GT_("Server name not specified in certificate!\n"));
735 /* Print the finger print. Note that on errors, we might print it more than once
736 * normally; we kluge around that by using a global variable. */
737 if (_check_fp == 1) {
741 digest_tp = EVP_md5();
742 if (digest_tp == NULL) {
743 report(stderr, GT_("EVP_md5() failed!\n"));
746 if (!X509_digest(x509_cert, digest_tp, digest, &dsz)) {
747 report(stderr, GT_("Out of memory!\n"));
751 te = text + sizeof(text);
752 for (dp = 0; dp < dsz; dp++) {
753 esz = snprintf(tp, te - tp, dp > 0 ? ":%02X" : "%02X", digest[dp]);
754 if (esz >= (size_t)(te - tp)) {
755 report(stderr, GT_("Digest text buffer too small!\n"));
760 if (outlevel > O_NORMAL)
761 report(stdout, GT_("%s key fingerprint: %s\n"), _server_label, text);
762 if (_check_digest != NULL) {
763 if (strcasecmp(text, _check_digest) == 0) {
764 if (outlevel > O_NORMAL)
765 report(stdout, GT_("%s fingerprints match.\n"), _server_label);
767 report(stderr, GT_("%s fingerprints do not match!\n"), _server_label);
770 } /* if (_check_digest != NULL) */
771 } /* if (_check_fp) */
772 } /* if (depth == 0 && !_depth0ck) */
774 if (err != X509_V_OK && err != _prev_err && !(_check_fp != 0 && _check_digest && !strict)) {
779 report(stderr, GT_("Server certificate verification error: %s\n"), X509_verify_cert_error_string(err));
780 /* We gave the error code, but maybe we can add some more details for debugging */
783 /* actually we do not want to lump these together, but
784 * since OpenSSL flipped the meaning of these error
785 * codes in the past, and they do hardly make a
786 * practical difference because servers need not provide
787 * the root signing certificate, we don't bother telling
788 * users the difference:
790 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
791 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
792 X509_NAME_oneline(issuer, buf, sizeof(buf));
793 buf[sizeof(buf) - 1] = '\0';
794 report(stderr, GT_("Broken certification chain at: %s\n"), (tmp = sdump(buf, strlen(buf))));
796 report(stderr, GT_( "This could mean that the server did not provide the intermediate CA's certificate(s), "
797 "which is nothing fetchmail could do anything about. For details, "
798 "please see the README.SSL-SERVER document that ships with fetchmail.\n"));
801 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
802 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
804 X509_NAME_oneline(issuer, buf, sizeof(buf));
805 buf[sizeof(buf) - 1] = '\0';
806 report(stderr, GT_("Missing trust anchor certificate: %s\n"), (tmp = sdump(buf, strlen(buf))));
809 report(stderr, GT_( "This could mean that the root CA's signing certificate is not in the "
810 "trusted CA certificate location, or that c_rehash needs to be run "
811 "on the certificate directory. For details, please "
812 "see the documentation of --sslcertpath and --sslcertfile in the manual page.\n"));
819 * If not in strict checking mode (--sslcertck), override this
820 * and pretend that verification had succeeded.
822 _verify_ok &= ok_return;
828 static int SSL_nock_verify_callback( int ok_return, X509_STORE_CTX *ctx )
830 return SSL_verify_callback(ok_return, ctx, 0);
833 static int SSL_ck_verify_callback( int ok_return, X509_STORE_CTX *ctx )
835 return SSL_verify_callback(ok_return, ctx, 1);
839 /* get commonName from certificate set in file.
840 * commonName is stored in buffer namebuffer, limited with namebufferlen
842 static const char *SSLCertGetCN(const char *mycert,
843 char *namebuffer, size_t namebufferlen)
845 const char *ret = NULL;
847 X509 *x509_cert = NULL;
848 X509_NAME *certname = NULL;
850 if (namebuffer && namebufferlen > 0) {
851 namebuffer[0] = 0x00;
852 certBio = BIO_new_file(mycert,"r");
854 x509_cert = PEM_read_bio_X509(certBio,NULL,NULL,NULL);
858 certname = X509_get_subject_name(x509_cert);
860 X509_NAME_get_text_by_NID(certname, NID_commonName,
861 namebuffer, namebufferlen) > 0)
863 X509_free(x509_cert);
869 /* performs initial SSL handshake over the connected socket
870 * uses SSL *ssl global variable, which is currently defined
873 int SSLOpen(int sock, char *mycert, char *mykey, const char *myproto, int certck,
874 char *cacertfile, char *certpath,
875 char *fingerprint, char *servercname, char *label, char **remotename)
877 struct stat randstat;
879 long sslopts = SSL_OP_ALL;
881 SSL_load_error_strings();
883 OpenSSL_add_all_algorithms(); /* see Debian Bug#576430 and manpage */
885 if (stat("/dev/random", &randstat) &&
886 stat("/dev/urandom", &randstat)) {
887 /* Neither /dev/random nor /dev/urandom are present, so add
888 entropy to the SSL PRNG a hard way. */
889 for (i = 0; i < 10000 && ! RAND_status (); ++i) {
892 gettimeofday (&tv, 0);
893 buf[0] = tv.tv_usec & 0xF;
894 buf[2] = (tv.tv_usec & 0xF0) >> 4;
895 buf[3] = (tv.tv_usec & 0xF00) >> 8;
896 buf[1] = (tv.tv_usec & 0xF000) >> 12;
897 RAND_add (buf, sizeof buf, 0.1);
901 if( sock < 0 || (unsigned)sock > FD_SETSIZE ) {
902 report(stderr, GT_("File descriptor out of range for SSL") );
906 /* Make sure a connection referring to an older context is not left */
907 _ssl_context[sock] = NULL;
909 if(!strcasecmp("ssl2",myproto)) {
910 #if HAVE_DECL_SSLV2_CLIENT_METHOD + 0 > 0
911 _ctx[sock] = SSL_CTX_new(SSLv2_client_method());
913 report(stderr, GT_("Your operating system does not support SSLv2.\n"));
916 } else if(!strcasecmp("ssl3",myproto)) {
917 _ctx[sock] = SSL_CTX_new(SSLv3_client_method());
918 } else if(!strcasecmp("tls1",myproto)) {
919 _ctx[sock] = SSL_CTX_new(TLSv1_client_method());
920 } else if (!strcasecmp("ssl23",myproto)) {
923 report(stderr,GT_("Invalid SSL protocol '%s' specified, using default (SSLv23).\n"), myproto);
928 _ctx[sock] = SSL_CTX_new(SSLv23_client_method());
930 if(_ctx[sock] == NULL) {
931 ERR_print_errors_fp(stderr);
936 char *tmp = getenv("FETCHMAIL_DISABLE_CBC_IV_COUNTERMEASURE");
937 if (tmp == NULL || *tmp == '\0' || strspn(tmp, " \t") == strlen(tmp))
938 sslopts &= ~ SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
941 SSL_CTX_set_options(_ctx[sock], sslopts);
944 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_ck_verify_callback);
946 /* In this case, we do not fail if verification fails. However,
947 * we provide the callback for output and possible fingerprint
949 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_nock_verify_callback);
952 /* Check which trusted X.509 CA certificate store(s) to load */
955 int want_default_cacerts = 0;
957 /* Load user locations if any is given */
958 if (certpath || cacertfile)
959 SSL_CTX_load_verify_locations(_ctx[sock],
960 cacertfile, certpath);
962 want_default_cacerts = 1;
964 tmp = getenv("FETCHMAIL_INCLUDE_DEFAULT_X509_CA_CERTS");
965 if (want_default_cacerts || (tmp && tmp[0])) {
966 SSL_CTX_set_default_verify_paths(_ctx[sock]);
970 _ssl_context[sock] = SSL_new(_ctx[sock]);
972 if(_ssl_context[sock] == NULL) {
973 ERR_print_errors_fp(stderr);
974 SSL_CTX_free(_ctx[sock]);
979 /* This static is for the verify callback */
980 _ssl_server_cname = servercname;
981 _server_label = label;
983 _check_digest = fingerprint;
989 if( mycert || mykey ) {
991 /* Ok... He has a certificate file defined, so lets declare it. If
992 * he does NOT have a separate certificate and private key file then
993 * assume that it's a combined key and certificate file.
1002 if ((!*remotename || !**remotename) && SSLCertGetCN(mycert, buffer, sizeof(buffer))) {
1004 *remotename = xstrdup(buffer);
1006 SSL_use_certificate_file(_ssl_context[sock], mycert, SSL_FILETYPE_PEM);
1007 SSL_use_RSAPrivateKey_file(_ssl_context[sock], mykey, SSL_FILETYPE_PEM);
1010 if (SSL_set_fd(_ssl_context[sock], sock) == 0
1011 || SSL_connect(_ssl_context[sock]) < 1) {
1012 ERR_print_errors_fp(stderr);
1013 SSL_free( _ssl_context[sock] );
1014 _ssl_context[sock] = NULL;
1015 SSL_CTX_free(_ctx[sock]);
1020 /* Paranoia: was the callback not called as we expected? */
1022 report(stderr, GT_("Certificate/fingerprint verification was somehow skipped!\n"));
1024 if (fingerprint != NULL || certck) {
1025 if( NULL != SSLGetContext( sock ) ) {
1026 /* Clean up the SSL stack */
1027 SSL_shutdown( _ssl_context[sock] );
1028 SSL_free( _ssl_context[sock] );
1029 _ssl_context[sock] = NULL;
1030 SSL_CTX_free(_ctx[sock]);
1037 if (!certck && !fingerprint &&
1038 (SSL_get_verify_result(_ssl_context[sock]) != X509_V_OK || !_verify_ok)) {
1039 report(stderr, GT_("Warning: the connection is insecure, continuing anyways. (Better use --sslcertck!)\n"));
1046 int SockClose(int sock)
1047 /* close a socket gracefully */
1050 if( NULL != SSLGetContext( sock ) ) {
1051 /* Clean up the SSL stack */
1052 SSL_shutdown( _ssl_context[sock] );
1053 SSL_free( _ssl_context[sock] );
1054 _ssl_context[sock] = NULL;
1055 SSL_CTX_free(_ctx[sock]);
1060 /* if there's an error closing at this point, not much we can do */
1061 return(fm_close(sock)); /* this is guarded */
1066 * Workaround Microsoft Winsock recv/WSARecv(..., MSG_PEEK) bug.
1067 * See http://sources.redhat.com/ml/cygwin/2001-08/msg00628.html
1070 static ssize_t cygwin_read(int sock, void *buf, size_t count)
1072 char *bp = (char *)buf;
1075 if ((n = read(sock, bp, count)) == (size_t)-1)
1080 if (outlevel >= O_VERBOSE)
1081 report(stdout, GT_("Cygwin socket read retry\n"));
1082 n2 = read(sock, bp + n, count - n);
1083 if (n2 == (size_t)-1 || n + n2 != count) {
1084 report(stderr, GT_("Cygwin socket read retry failed!\n"));
1091 #endif /* __CYGWIN__ */