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 static int setsocktimeout(int sock, int which, int timeout) {
209 rc = setsockopt(sock, SOL_SOCKET, which, &tv, sizeof(tv));
211 report(stderr, GT_("setsockopt(%d, SOL_SOCKET) failed: %s"), sock, strerror(errno));
216 /** Configure socket options such as send/receive timeout at the socket
217 * level, to avoid network-induced stalls.
219 int SockTimeout(int sock, int timeout)
223 if (setsocktimeout(sock, SO_RCVTIMEO, timeout)) err = 1;
224 if (setsocktimeout(sock, SO_SNDTIMEO, timeout)) err = 1;
228 /** Set socket to SO_KEEPALIVE. \return 0 for success. */
229 int SockKeepalive(int sock) {
231 return setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof keepalive);
234 int UnixOpen(const char *path)
237 struct sockaddr_un ad;
238 memset(&ad, 0, sizeof(ad));
239 ad.sun_family = AF_UNIX;
240 strncpy(ad.sun_path, path, sizeof(ad.sun_path)-1);
242 sock = socket( AF_UNIX, SOCK_STREAM, 0 );
249 /* Socket opened saved. Usefull if connect timeout
250 * because it can be closed.
252 mailserver_socket_temp = sock;
254 if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
257 fm_close(sock); /* don't use SockClose, no traffic yet */
263 /* No connect timeout, then no need to set mailserver_socket_temp */
264 mailserver_socket_temp = -1;
269 int SockOpen(const char *host, const char *service,
270 const char *plugin, struct addrinfo **ai0)
272 struct addrinfo *ai, req;
275 char errbuf[8192] = "";
277 #ifdef HAVE_SOCKETPAIR
279 return handle_plugin(host,service,plugin);
280 #endif /* HAVE_SOCKETPAIR */
282 memset(&req, 0, sizeof(struct addrinfo));
283 req.ai_socktype = SOCK_STREAM;
285 req.ai_flags = AI_ADDRCONFIG;
288 i = fm_getaddrinfo(host, service, &req, ai0);
290 report(stderr, GT_("getaddrinfo(\"%s\",\"%s\") error: %s\n"),
291 host, service, gai_strerror(i));
292 if (i == EAI_SERVICE)
293 report(stderr, GT_("Try adding the --service option (see also FAQ item R12).\n"));
297 /* NOTE a Linux bug here - getaddrinfo will happily return 127.0.0.1
298 * twice if no IPv6 is configured */
300 for (ord = 0, ai = *ai0; ai; ord++, ai = ai->ai_next) {
301 char buf[256]; /* hostname */
302 char pb[256]; /* service name */
303 int gnie; /* getnameinfo result code */
305 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof(buf), NULL, 0, NI_NUMERICHOST);
307 snprintf(buf, sizeof(buf), GT_("unknown (%s)"), gai_strerror(gnie));
308 gnie = getnameinfo(ai->ai_addr, ai->ai_addrlen, NULL, 0, pb, sizeof(pb), NI_NUMERICSERV);
310 snprintf(pb, sizeof(pb), GT_("unknown (%s)"), gai_strerror(gnie));
312 if (outlevel >= O_VERBOSE)
313 report_build(stdout, GT_("Trying to connect to %s/%s..."), buf, pb);
314 i = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
317 /* mask EAFNOSUPPORT errors, they confuse users for
318 * multihomed hosts */
319 if (errno != EAFNOSUPPORT)
321 if (outlevel >= O_VERBOSE)
322 report_complete(stdout, GT_("cannot create socket: %s\n"), strerror(e));
323 snprintf(errbuf+strlen(errbuf), sizeof(errbuf)-strlen(errbuf),\
324 GT_("name %d: cannot create socket family %d type %d: %s\n"), ord, ai->ai_family, ai->ai_socktype, strerror(e));
328 SockTimeout(i, mytimeout);
331 /* Save socket descriptor.
332 * Used to close the socket after connect timeout. */
333 mailserver_socket_temp = i;
335 if (connect(i, (struct sockaddr *) ai->ai_addr, ai->ai_addrlen) < 0) {
338 /* additionally, suppress IPv4 network unreach errors */
339 if (e != EAFNOSUPPORT)
342 if (outlevel >= O_VERBOSE)
343 report_complete(stdout, GT_("connection failed.\n"));
344 if (outlevel >= O_VERBOSE)
345 report(stderr, GT_("connection to %s:%s [%s/%s] failed: %s.\n"), host, service, buf, pb, strerror(e));
346 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));
351 if (outlevel >= O_VERBOSE)
352 report_complete(stdout, GT_("connected.\n"));
355 /* No connect timeout, then no need to set mailserver_socket_temp */
356 mailserver_socket_temp = -1;
361 fm_freeaddrinfo(*ai0);
365 report(stderr, GT_("Connection errors for this poll:\n%s"), errbuf);
373 #if defined(HAVE_STDARG_H)
374 int SockPrintf(int sock, const char* format, ...)
377 int SockPrintf(sock,format,va_alist)
386 #if defined(HAVE_STDARG_H)
387 va_start(ap, format) ;
391 vsnprintf(buf, sizeof(buf), format, ap);
393 return SockWrite(sock, buf, strlen(buf));
398 #include <openssl/ssl.h>
399 #include <openssl/err.h>
400 #include <openssl/pem.h>
401 #include <openssl/x509v3.h>
402 #include <openssl/rand.h>
404 static SSL_CTX *_ctx[FD_SETSIZE];
405 static SSL *_ssl_context[FD_SETSIZE];
407 static SSL *SSLGetContext( int );
408 #endif /* SSL_ENABLE */
410 int SockWrite(int sock, const char *buf, int len)
420 if( NULL != ( ssl = SSLGetContext( sock ) ) )
421 n = SSL_write(ssl, buf, len);
423 #endif /* SSL_ENABLE */
424 n = fm_write(sock, buf, len);
434 int SockRead(int sock, char *buf, int len)
436 char *newline, *bp = buf;
454 * The reason for these gymnastics is that we want two things:
455 * (1) to read \n-terminated lines,
456 * (2) to return the true length of data read, even if the
457 * data coming in has embedded NULS.
460 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
462 /* OK... SSL_peek works a little different from MSG_PEEK
463 Problem is that SSL_peek can return 0 if there
464 is no data currently available. If, on the other
465 hand, we lose the socket, we also get a zero, but
466 the SSL_read then SEGFAULTS! To deal with this,
467 we'll check the error code any time we get a return
468 of zero from SSL_peek. If we have an error, we bail.
469 If we don't, we read one character in SSL_read and
470 loop. This should continue to work even if they
471 later change the behavior of SSL_peek
472 to "fix" this problem... :-( */
473 if ((n = SSL_peek(ssl, bp, len)) < 0) {
474 (void)SSL_get_error(ssl, n);
478 /* SSL_peek says no data... Does he mean no data
479 or did the connection blow up? If we got an error
481 if (0 != SSL_get_error(ssl, n)) {
484 /* We didn't get an error so read at least one
485 character at this point and loop */
487 /* Make sure newline start out NULL!
488 * We don't have a string to pass through
489 * the strchr at this point yet */
491 } else if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
492 n = newline - bp + 1;
493 /* Matthias Andree: SSL_read can return 0, in that case
494 * we must call SSL_get_error to figure if there was
495 * an error or just a "no data" condition */
496 if ((n = SSL_read(ssl, bp, n)) <= 0) {
497 if ((n = SSL_get_error(ssl, n))) {
501 /* Check for case where our single character turned out to
502 * be a newline... (It wasn't going to get caught by
503 * the strchr above if it came from the hack... ). */
504 if( NULL == newline && 1 == n && '\n' == *bp ) {
505 /* Got our newline - this will break
506 out of the loop now */
511 #endif /* SSL_ENABLE */
515 if ((n = fm_read(sock, bp, 1)) <= 0)
517 if ((n = fm_peek(sock, bp, len)) <= 0)
520 if ((newline = (char *)memchr(bp, '\n', n)) != NULL)
521 n = newline - bp + 1;
523 if ((n = fm_read(sock, bp, n)) == -1)
525 #endif /* __BEOS__ */
536 int SockPeek(int sock)
537 /* peek at the next socket character without actually reading it */
546 if( NULL != ( ssl = SSLGetContext( sock ) ) ) {
547 n = SSL_peek(ssl, &ch, 1);
549 (void)SSL_get_error(ssl, n);
553 /* This code really needs to implement a "hold back"
554 * to simulate a functioning SSL_peek()... sigh...
555 * Has to be coordinated with the read code above.
556 * Next on the list todo... */
558 /* SSL_peek says 0... Does that mean no data
559 or did the connection blow up? If we got an error
561 if(0 != SSL_get_error(ssl, n)) {
565 /* Haven't seen this case actually occur, but...
566 if the problem in SockRead can occur, this should
567 be possible... Just not sure what to do here.
568 This should be a safe "punt" the "peek" but don't
569 "punt" the "session"... */
571 return 0; /* Give him a '\0' character */
575 #endif /* SSL_ENABLE */
576 n = fm_peek(sock, &ch, 1);
588 static char *_ssl_server_cname = NULL;
589 static int _check_fp;
590 static char *_check_digest;
591 static char *_server_label;
592 static int _depth0ck;
593 static int _firstrun;
594 static int _prev_err;
595 static int _verify_ok;
597 SSL *SSLGetContext( int sock )
599 if( sock < 0 || (unsigned)sock > FD_SETSIZE )
601 if( _ctx[sock] == NULL )
603 return _ssl_context[sock];
606 /* ok_return (preverify_ok) is 1 if this stage of certificate verification
607 passed, or 0 if it failed. This callback lets us display informative
608 errors, and perform additional validation (e.g. CN matches) */
609 static int SSL_verify_callback( int ok_return, X509_STORE_CTX *ctx, int strict )
611 #define SSLverbose (((outlevel) >= O_DEBUG) || ((outlevel) >= O_VERBOSE && (depth) == 0))
615 unsigned char digest[EVP_MAX_MD_SIZE];
616 char text[EVP_MAX_MD_SIZE * 3 + 1], *tp, *te;
617 const EVP_MD *digest_tp;
618 unsigned int dsz, esz;
619 X509_NAME *subj, *issuer;
622 x509_cert = X509_STORE_CTX_get_current_cert(ctx);
623 err = X509_STORE_CTX_get_error(ctx);
624 depth = X509_STORE_CTX_get_error_depth(ctx);
626 subj = X509_get_subject_name(x509_cert);
627 issuer = X509_get_issuer_name(x509_cert);
629 if (outlevel >= O_VERBOSE) {
630 if (depth == 0 && SSLverbose)
631 report(stderr, GT_("Server certificate:\n"));
636 report(stdout, GT_("Certificate chain, from root to peer, starting at depth %d:\n"), depth);
639 report(stdout, GT_("Certificate at depth %d:\n"), depth);
644 if ((i = X509_NAME_get_text_by_NID(issuer, NID_organizationName, buf, sizeof(buf))) != -1) {
645 report(stdout, GT_("Issuer Organization: %s\n"), (tt = sdump(buf, i)));
647 if ((size_t)i >= sizeof(buf) - 1)
648 report(stdout, GT_("Warning: Issuer Organization Name too long (possibly truncated).\n"));
650 report(stdout, GT_("Unknown Organization\n"));
651 if ((i = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, sizeof(buf))) != -1) {
652 report(stdout, GT_("Issuer CommonName: %s\n"), (tt = sdump(buf, i)));
654 if ((size_t)i >= sizeof(buf) - 1)
655 report(stdout, GT_("Warning: Issuer CommonName too long (possibly truncated).\n"));
657 report(stdout, GT_("Unknown Issuer CommonName\n"));
661 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
663 report(stdout, GT_("Subject CommonName: %s\n"), (tt = sdump(buf, i)));
666 if ((size_t)i >= sizeof(buf) - 1) {
667 /* Possible truncation. In this case, this is a DNS name, so this
668 * is really bad. We do not tolerate this even in the non-strict case. */
669 report(stderr, GT_("Bad certificate: Subject CommonName too long!\n"));
672 if ((size_t)i > strlen(buf)) {
673 /* Name contains embedded NUL characters, so we complain. This is likely
674 * a certificate spoofing attack. */
675 report(stderr, GT_("Bad certificate: Subject CommonName contains NUL, aborting!\n"));
680 if (depth == 0) { /* peer certificate */
685 if ((i = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, sizeof(buf))) != -1) {
686 if (_ssl_server_cname != NULL) {
688 char *p2 = _ssl_server_cname;
690 STACK_OF(GENERAL_NAME) *gens;
692 /* RFC 2595 section 2.4: find a matching name
693 * first find a match among alternative names */
694 gens = (STACK_OF(GENERAL_NAME) *)X509_get_ext_d2i(x509_cert, NID_subject_alt_name, NULL, NULL);
697 for (j = 0, r = sk_GENERAL_NAME_num(gens); j < r; ++j) {
698 const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, j);
699 if (gn->type == GEN_DNS) {
700 char *pp1 = (char *)gn->d.ia5->data;
701 char *pp2 = _ssl_server_cname;
702 if (outlevel >= O_VERBOSE) {
703 report(stdout, GT_("Subject Alternative Name: %s\n"), (tt = sdump(pp1, (size_t)gn->d.ia5->length)));
706 /* Name contains embedded NUL characters, so we complain. This
707 * is likely a certificate spoofing attack. */
708 if ((size_t)gn->d.ia5->length != strlen(pp1)) {
709 report(stderr, GT_("Bad certificate: Subject Alternative Name contains NUL, aborting!\n"));
710 sk_GENERAL_NAME_free(gens);
713 if (name_match(pp1, pp2)) {
718 sk_GENERAL_NAME_free(gens);
720 if (name_match(p1, p2)) {
724 if (strict || SSLverbose) {
726 GT_("Server CommonName mismatch: %s != %s\n"),
727 (tt = sdump(buf, i)), _ssl_server_cname );
732 } else if (ok_return) {
733 report(stderr, GT_("Server name not set, could not verify certificate!\n"));
734 if (strict) return (0);
737 if (outlevel >= O_VERBOSE)
738 report(stdout, GT_("Unknown Server CommonName\n"));
739 if (ok_return && strict) {
740 report(stderr, GT_("Server name not specified in certificate!\n"));
744 /* Print the finger print. Note that on errors, we might print it more than once
745 * normally; we kluge around that by using a global variable. */
746 if (_check_fp == 1) {
750 digest_tp = EVP_md5();
751 if (digest_tp == NULL) {
752 report(stderr, GT_("EVP_md5() failed!\n"));
755 if (!X509_digest(x509_cert, digest_tp, digest, &dsz)) {
756 report(stderr, GT_("Out of memory!\n"));
760 te = text + sizeof(text);
761 for (dp = 0; dp < dsz; dp++) {
762 esz = snprintf(tp, te - tp, dp > 0 ? ":%02X" : "%02X", digest[dp]);
763 if (esz >= (size_t)(te - tp)) {
764 report(stderr, GT_("Digest text buffer too small!\n"));
769 if (outlevel > O_NORMAL)
770 report(stdout, GT_("%s key fingerprint: %s\n"), _server_label, text);
771 if (_check_digest != NULL) {
772 if (strcasecmp(text, _check_digest) == 0) {
773 if (outlevel > O_NORMAL)
774 report(stdout, GT_("%s fingerprints match.\n"), _server_label);
776 report(stderr, GT_("%s fingerprints do not match!\n"), _server_label);
779 } /* if (_check_digest != NULL) */
780 } /* if (_check_fp) */
781 } /* if (depth == 0 && !_depth0ck) */
783 if (err != X509_V_OK && err != _prev_err && !(_check_fp != 0 && _check_digest && !strict)) {
786 report(stderr, GT_("Server certificate verification error: %s\n"), X509_verify_cert_error_string(err));
787 /* We gave the error code, but maybe we can add some more details for debugging */
790 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
791 X509_NAME_oneline(issuer, buf, sizeof(buf));
792 buf[sizeof(buf) - 1] = '\0';
793 report(stderr, GT_("unknown issuer (first %d characters): %s\n"), (int)(sizeof(buf)-1), buf);
794 report(stderr, GT_("This error usually happens when the server provides an incomplete certificate "
795 "chain, which is nothing fetchmail could do anything about. For details, "
796 "please see the README.SSL-SERVER document that comes with fetchmail.\n"));
798 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
799 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
800 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
801 X509_NAME_oneline(subj, buf, sizeof(buf));
802 buf[sizeof(buf) - 1] = '\0';
803 report(stderr, GT_("This means that the root signing certificate (issued for %s) is not in the "
804 "trusted CA certificate locations, or that c_rehash needs to be run "
805 "on the certificate directory. For details, please "
806 "see the documentation of --sslcertpath and --sslcertfile in the manual page.\n"), buf);
813 * If not in strict checking mode (--sslcertck), override this
814 * and pretend that verification had succeeded.
816 _verify_ok &= ok_return;
822 static int SSL_nock_verify_callback( int ok_return, X509_STORE_CTX *ctx )
824 return SSL_verify_callback(ok_return, ctx, 0);
827 static int SSL_ck_verify_callback( int ok_return, X509_STORE_CTX *ctx )
829 return SSL_verify_callback(ok_return, ctx, 1);
833 /* get commonName from certificate set in file.
834 * commonName is stored in buffer namebuffer, limited with namebufferlen
836 static const char *SSLCertGetCN(const char *mycert,
837 char *namebuffer, size_t namebufferlen)
839 const char *ret = NULL;
841 X509 *x509_cert = NULL;
842 X509_NAME *certname = NULL;
844 if (namebuffer && namebufferlen > 0) {
845 namebuffer[0] = 0x00;
846 certBio = BIO_new_file(mycert,"r");
848 x509_cert = PEM_read_bio_X509(certBio,NULL,NULL,NULL);
852 certname = X509_get_subject_name(x509_cert);
854 X509_NAME_get_text_by_NID(certname, NID_commonName,
855 namebuffer, namebufferlen) > 0)
857 X509_free(x509_cert);
863 /* performs initial SSL handshake over the connected socket
864 * uses SSL *ssl global variable, which is currently defined
867 int SSLOpen(int sock, char *mycert, char *mykey, const char *myproto, int certck,
868 char *cacertfile, char *certpath,
869 char *fingerprint, char *servercname, char *label, char **remotename)
871 struct stat randstat;
874 SSL_load_error_strings();
876 OpenSSL_add_all_algorithms(); /* see Debian Bug#576430 and manpage */
878 if (stat("/dev/random", &randstat) &&
879 stat("/dev/urandom", &randstat)) {
880 /* Neither /dev/random nor /dev/urandom are present, so add
881 entropy to the SSL PRNG a hard way. */
882 for (i = 0; i < 10000 && ! RAND_status (); ++i) {
885 gettimeofday (&tv, 0);
886 buf[0] = tv.tv_usec & 0xF;
887 buf[2] = (tv.tv_usec & 0xF0) >> 4;
888 buf[3] = (tv.tv_usec & 0xF00) >> 8;
889 buf[1] = (tv.tv_usec & 0xF000) >> 12;
890 RAND_add (buf, sizeof buf, 0.1);
894 if( sock < 0 || (unsigned)sock > FD_SETSIZE ) {
895 report(stderr, GT_("File descriptor out of range for SSL") );
899 /* Make sure a connection referring to an older context is not left */
900 _ssl_context[sock] = NULL;
902 if(!strcasecmp("ssl3",myproto)) {
903 _ctx[sock] = SSL_CTX_new(SSLv3_client_method());
904 } else if(!strcasecmp("tls1",myproto)) {
905 _ctx[sock] = SSL_CTX_new(TLSv1_client_method());
906 } else if (!strcasecmp("ssl23",myproto)) {
909 fprintf(stderr,GT_("Invalid SSL protocol '%s' specified, using default (SSL23).\n"), myproto);
914 _ctx[sock] = SSL_CTX_new(SSLv23_client_method());
916 if(_ctx[sock] == NULL) {
917 ERR_print_errors_fp(stderr);
921 SSL_CTX_set_options(_ctx[sock], SSL_OP_ALL | SSL_OP_NO_SSLv2);
924 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_ck_verify_callback);
926 /* In this case, we do not fail if verification fails. However,
927 * we provide the callback for output and possible fingerprint
929 SSL_CTX_set_verify(_ctx[sock], SSL_VERIFY_PEER, SSL_nock_verify_callback);
932 /* Check which trusted X.509 CA certificate store(s) to load */
935 int want_default_cacerts = 0;
937 /* Load user locations if any is given */
938 if (certpath || cacertfile)
939 SSL_CTX_load_verify_locations(_ctx[sock],
940 cacertfile, certpath);
942 want_default_cacerts = 1;
944 tmp = getenv("FETCHMAIL_INCLUDE_DEFAULT_X509_CA_CERTS");
945 if (want_default_cacerts || (tmp && tmp[0])) {
946 SSL_CTX_set_default_verify_paths(_ctx[sock]);
950 _ssl_context[sock] = SSL_new(_ctx[sock]);
952 if(_ssl_context[sock] == NULL) {
953 ERR_print_errors_fp(stderr);
954 SSL_CTX_free(_ctx[sock]);
959 /* This static is for the verify callback */
960 _ssl_server_cname = servercname;
961 _server_label = label;
963 _check_digest = fingerprint;
969 if( mycert || mykey ) {
971 /* Ok... He has a certificate file defined, so lets declare it. If
972 * he does NOT have a separate certificate and private key file then
973 * assume that it's a combined key and certificate file.
982 if ((!*remotename || !**remotename) && SSLCertGetCN(mycert, buffer, sizeof(buffer))) {
984 *remotename = xstrdup(buffer);
986 SSL_use_certificate_file(_ssl_context[sock], mycert, SSL_FILETYPE_PEM);
987 SSL_use_RSAPrivateKey_file(_ssl_context[sock], mykey, SSL_FILETYPE_PEM);
990 if (SSL_set_fd(_ssl_context[sock], sock) == 0
991 || SSL_connect(_ssl_context[sock]) < 1) {
992 ERR_print_errors_fp(stderr);
993 SSL_free( _ssl_context[sock] );
994 _ssl_context[sock] = NULL;
995 SSL_CTX_free(_ctx[sock]);
1000 /* Paranoia: was the callback not called as we expected? */
1002 report(stderr, GT_("Certificate/fingerprint verification was somehow skipped!\n"));
1004 if (fingerprint != NULL || certck) {
1005 if( NULL != SSLGetContext( sock ) ) {
1006 /* Clean up the SSL stack */
1007 SSL_shutdown( _ssl_context[sock] );
1008 SSL_free( _ssl_context[sock] );
1009 _ssl_context[sock] = NULL;
1010 SSL_CTX_free(_ctx[sock]);
1017 if (!certck && !fingerprint &&
1018 (SSL_get_verify_result(_ssl_context[sock]) != X509_V_OK || !_verify_ok)) {
1019 report(stderr, GT_("Warning: the connection is insecure, continuing anyways. (Better use --sslcertck!)\n"));
1026 int SockClose(int sock)
1027 /* close a socket gracefully */
1030 if( NULL != SSLGetContext( sock ) ) {
1031 /* Clean up the SSL stack */
1032 SSL_shutdown( _ssl_context[sock] );
1033 SSL_free( _ssl_context[sock] );
1034 _ssl_context[sock] = NULL;
1035 SSL_CTX_free(_ctx[sock]);
1040 /* if there's an error closing at this point, not much we can do */
1041 return(fm_close(sock)); /* this is guarded */
1046 * Workaround Microsoft Winsock recv/WSARecv(..., MSG_PEEK) bug.
1047 * See http://sources.redhat.com/ml/cygwin/2001-08/msg00628.html
1050 static ssize_t cygwin_read(int sock, void *buf, size_t count)
1052 char *bp = (char *)buf;
1055 if ((n = read(sock, bp, count)) == (size_t)-1)
1060 if (outlevel >= O_VERBOSE)
1061 report(stdout, GT_("Cygwin socket read retry\n"));
1062 n2 = read(sock, bp + n, count - n);
1063 if (n2 == (size_t)-1 || n + n2 != count) {
1064 report(stderr, GT_("Cygwin socket read retry failed!\n"));
1071 #endif /* __CYGWIN__ */