/* ======================================================================== * Copyright 2018 Eduardo Chappa * Copyright 2008-2009 Mark Crispin * ======================================================================== */ /* * Program: SSL authentication/encryption module for Windows 9x and NT * * Author: Mark Crispin * * Date: 22 September 1998 * Last Edited: 8 November 2009 * * Previous versions of this file were * * Copyright 1988-2008 University of Washington * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * */ #ifdef ENABLE_WINDOWS_LIBRESSL #define crypt ssl_private_crypt #define STRING OPENSSL_STRING #include #include #include #include #include #include #include #include #ifdef OPENSSL_1_1_0 #include #include #ifdef TLSv1_client_method #undef TLSv1_client_method #endif /* TLSv1_client_method */ #ifdef TLSv1_1_client_method #undef TLSv1_1_client_method #endif /* TLSv1_1_client_method */ #ifdef TLSv1_2_client_method #undef TLSv1_2_client_method #endif /* TLSv1_2_client_method */ #ifdef DTLSv1_client_method #undef DTLSv1_client_method #endif /* DTLSv1_client_method */ #ifdef DTLSv1_2_client_method #undef DTLSv1_2_client_method #endif /* DTLSv1_2_client_method */ #define TLSv1_client_method TLS_client_method #define TLSv1_1_client_method TLS_client_method #define TLSv1_2_client_method TLS_client_method #define DTLSv1_client_method DTLS_client_method #define DTLSv1_2_client_method DTLS_client_method #endif /* OPENSSL_1_1_0 */ #ifndef DTLSv1_2_client_method #define DTLSv1_2_client_method DTLSv1_client_method #endif /* DTLSv1_2_client_method */ #undef STRING #undef crypt #define SSLBUFLEN 8192 /* * PCI auditing compliance, disable: * SSLv2 * anonymous D-H (no certificate * export encryption ciphers (40 and 56 bits) * low encryption cipher suites (40 and 56 bits, excluding export) * null encryption (disabling implied by "ALL") * * UW imapd just disables low-grade and null ("ALL:!LOW"). This setting * will break clients that attempt to use the newly-prohibited mechanisms. * * I question the value of disabling SSLv2, as opposed to disabling the SSL * ports (e.g., 993 for IMAP, 995 for POP3) and using TLS exclusively. */ #define SSLCIPHERLIST "ALL:!SSLv2:!ADH:!EXP:!LOW" /* SSL I/O stream */ typedef struct ssl_stream { TCPSTREAM *tcpstream; /* TCP stream */ SSL_CTX *context; /* SSL context */ SSL *con; /* SSL connection */ int ictr; /* input counter */ char *iptr; /* input pointer */ char ibuf[SSLBUFLEN]; /* input buffer */ } SSLSTREAM; #include "sslio.h" /* Function prototypes */ const SSL_METHOD *ssl_connect_mthd(int flag); static SSLSTREAM *ssl_start(TCPSTREAM *tstream,char *host,unsigned long flags); static char *ssl_start_work (SSLSTREAM *stream,char *host,unsigned long flags); static int ssl_open_verify (int ok,X509_STORE_CTX *ctx); static char *ssl_validate_cert (X509 *cert,char *host); static long ssl_compare_hostnames (unsigned char *s,unsigned char *pat); static char *ssl_getline_work (SSLSTREAM *stream,unsigned long *size, long *contd); static long ssl_abort (SSLSTREAM *stream); #ifdef OPENSSL_1_1_0 #define SSL_CTX_TYPE SSL_CTX #else #define SSL_CTX_TYPE SSL #endif /* OPENSSL_1_1_0 */ static RSA *ssl_genkey (SSL_CTX_TYPE *con,int export,int keylength); /* Secure Sockets Layer network driver dispatch */ static struct ssl_driver ssldriver = { ssl_open, /* open connection */ ssl_aopen, /* open preauthenticated connection */ ssl_getline, /* get a line */ ssl_getbuffer, /* get a buffer */ ssl_soutr, /* output pushed data */ ssl_sout, /* output string */ ssl_close, /* close connection */ ssl_host, /* return host name */ ssl_remotehost, /* return remote host name */ ssl_port, /* return port number */ ssl_localhost /* return local host name */ }; /* non-NIL if doing SSL primary I/O */ static SSLSTDIOSTREAM *sslstdio = NIL; static char *start_tls = NIL; /* non-NIL if start TLS requested */ /* One-time SSL initialization */ static int sslonceonly = 0; void ssl_onceonlyinit (void) { if (!sslonceonly++) { /* only need to call it once */ int fd; char tmp[MAILTMPLEN]; struct stat sbuf; /* if system doesn't have /dev/urandom */ if (stat ("/dev/urandom",&sbuf)) { strcpy(tmp, "SSLXXXXXX"); fd = fopen(tmp,"a"); unlink (tmp); /* don't need the file */ fstat (fd,&sbuf); /* get information about the file */ close (fd); /* flush descriptor */ /* not great but it'll have to do */ sprintf (tmp + strlen (tmp),"%.80s%lx%.80s%lx%lx%lx%lx%lx", tcp_serveraddr (),(unsigned long) tcp_serverport (), tcp_clientaddr (),(unsigned long) tcp_clientport (), (unsigned long) sbuf.st_ino,(unsigned long) time (0), (unsigned long) gethostid (),(unsigned long) getpid ()); RAND_seed (tmp,strlen (tmp)); } /* apply runtime linkage */ mail_parameters (NIL,SET_SSLDRIVER,(void *) &ssldriver); mail_parameters (NIL,SET_SSLSTART,(void *) ssl_start); #ifdef OPENSSL_1_1_0 OPENSSL_init_ssl(0, NULL); #else SSL_library_init (); /* add all algorithms */ #endif /* OPENSSL_1_1_0 */ } } /* SSL open * Accepts: host name * contact service name * contact port number * Returns: SSL stream if success else NIL */ SSLSTREAM *ssl_open (char *host,char *service,unsigned long port) { TCPSTREAM *stream = tcp_open (host,service,port); return stream ? ssl_start (stream,host,port) : NIL; } /* SSL authenticated open * Accepts: host name * service name * returned user name buffer * Returns: SSL stream if success else NIL */ SSLSTREAM *ssl_aopen (NETMBX *mb,char *service,char *usrbuf) { return NIL; /* don't use this mechanism with SSL */ } /* ssl_connect_mthd: returns a context pointer to the connection to * a ssl server */ const SSL_METHOD *ssl_connect_mthd(int flag) { if (flag & NET_TRYTLS1) #ifndef OPENSSL_NO_TLS1_METHOD return TLSv1_client_method(); #else return TLS_client_method(); #endif /* OPENSSL_NO_TLS1_METHOD */ else if(flag & NET_TRYTLS1_1) #ifndef OPENSSL_NO_TLS1_1_METHOD return TLSv1_1_client_method(); #else return TLS_client_method(); #endif /* OPENSSL_NO_TLS1_1_METHOD */ else if(flag & NET_TRYTLS1_2) #ifndef OPENSSL_NO_TLS1_2_METHOD return TLSv1_2_client_method(); #else return TLS_client_method(); #endif /* OPENSSL_NO_TLS1_2_METHOD */ else if(flag & NET_TRYTLS1_3) return TLS_client_method(); else if(flag & NET_TRYDTLS1) #ifndef OPENSSL_NO_DTLS1_METHOD return DTLSv1_client_method(); #else return DTLS_client_method(); #endif /* OPENSSL_NO_DTLS1_METHOD */ else if(flag & NET_TRYDTLS1_2) #ifndef OPENSSL_NO_DTLS1_METHOD return DTLSv1_2_client_method(); #else return DTLS_client_method(); #endif /* OPENSSL_NO_DTLS1_METHOD */ else return SSLv23_client_method(); } /* Start SSL/TLS negotiations * Accepts: open TCP stream of session * user's host name * flags * Returns: SSL stream if success else NIL */ static SSLSTREAM *ssl_start (TCPSTREAM *tstream,char *host,unsigned long flags) { char *reason,tmp[MAILTMPLEN]; sslfailure_t sf = (sslfailure_t) mail_parameters (NIL,GET_SSLFAILURE,NIL); blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL); void *data = (*bn) (BLOCK_SENSITIVE,NIL); SSLSTREAM *stream = (SSLSTREAM *) memset (fs_get (sizeof (SSLSTREAM)),0, sizeof (SSLSTREAM)); stream->tcpstream = tstream; /* bind TCP stream */ /* do the work */ reason = ssl_start_work (stream,host,flags); (*bn) (BLOCK_NONSENSITIVE,data); if (reason) { /* failed? */ ssl_close (stream); /* failed to do SSL */ stream = NIL; /* no stream returned */ switch (*reason) { /* analyze reason */ case '*': /* certificate failure */ ++reason; /* skip over certificate failure indication */ /* pass to error callback */ if (sf) (*sf) (host,reason,flags); else { /* no error callback, build error message */ sprintf (tmp,"Certificate failure for %.80s: %.512s",host,reason); mm_log (tmp,ERROR); } case '\0': /* user answered no to certificate callback */ if (flags & NET_TRYSSL) /* return dummy stream to stop tryssl */ stream = (SSLSTREAM *) memset (fs_get (sizeof (SSLSTREAM)),0, sizeof (SSLSTREAM)); break; default: /* non-certificate failure */ if (flags & NET_TRYSSL); /* no error output if tryssl */ /* pass to error callback */ else if (sf) (*sf) (host,reason,flags); else { /* no error callback, build error message */ sprintf (tmp,"TLS/SSL failure for %.80s: %.512s",host,reason); mm_log (tmp,ERROR); } break; } } return stream; } /* Start SSL/TLS negotiations worker routine * Accepts: SSL stream * user's host name * flags * Returns: NIL if success, else error reason */ /* evil but I had no choice */ static char *ssl_last_error = NIL; static char *ssl_last_host = NIL; static char *ssl_start_work (SSLSTREAM *stream,char *host,unsigned long flags) { BIO *bio; X509 *cert; unsigned long sl,tl; char *s,*t,*err,tmp[MAILTMPLEN], buf[256]; sslcertificatequery_t scq = (sslcertificatequery_t) mail_parameters (NIL,GET_SSLCERTIFICATEQUERY,NIL); sslclientcert_t scc = (sslclientcert_t) mail_parameters (NIL,GET_SSLCLIENTCERT,NIL); sslclientkey_t sck = (sslclientkey_t) mail_parameters (NIL,GET_SSLCLIENTKEY,NIL); if (ssl_last_error) fs_give ((void **) &ssl_last_error); ssl_last_host = host; if (!(stream->context = SSL_CTX_new (ssl_connect_mthd(flags)))) return "SSL context failed"; SSL_CTX_set_options (stream->context,0); /* disable certificate validation? */ if (flags & NET_NOVALIDATECERT) SSL_CTX_set_verify (stream->context,SSL_VERIFY_NONE,NIL); else SSL_CTX_set_verify (stream->context,SSL_VERIFY_PEER,ssl_open_verify); /* set default paths to CAs... */ SSL_CTX_set_default_verify_paths (stream->context); /* ...unless a non-standard path desired */ if ((s = (char *) mail_parameters (NIL,GET_SSLCAPATH,NIL)) != NULL) SSL_CTX_load_verify_locations (stream->context,NIL,s); /* want to send client certificate? */ if (scc && (s = (*scc) ()) && (sl = strlen (s))) { if ((cert = PEM_read_bio_X509 (bio = BIO_new_mem_buf (s,sl),NIL,NIL,NIL)) != NULL) { SSL_CTX_use_certificate (stream->context,cert); X509_free (cert); } BIO_free (bio); if (!cert) return "SSL client certificate failed"; /* want to supply private key? */ if ((t = (sck ? (*sck) () : s)) && (tl = strlen (t))) { EVP_PKEY *key; if ((key = PEM_read_bio_PrivateKey (bio = BIO_new_mem_buf (t,tl), NIL,NIL,"")) != NULL) { SSL_CTX_use_PrivateKey (stream->context,key); EVP_PKEY_free (key); } BIO_free (bio); memset (t,0,tl); /* erase key */ } if (s != t) memset (s,0,sl);/* erase certificate if different from key */ } /* create connection */ if (!(stream->con = (SSL *) SSL_new (stream->context))) return "SSL connection failed"; bio = BIO_new_socket (stream->tcpstream->tcpsi,BIO_NOCLOSE); SSL_set_bio (stream->con,bio,bio); SSL_set_connect_state (stream->con); if (SSL_in_init (stream->con)) SSL_total_renegotiations (stream->con); /* now negotiate SSL */ if (SSL_write (stream->con,"",0) < 0) return ssl_last_error ? ssl_last_error : "SSL negotiation failed"; /* need to validate host names? */ if (!(flags & NET_NOVALIDATECERT) && (err = ssl_validate_cert (cert = SSL_get_peer_certificate (stream->con), host))) { /* application callback */ X509_NAME_oneline (X509_get_subject_name(cert), buf, sizeof(buf)); if (scq) return (*scq) (err,host,cert ? buf : "???") ? NIL : ""; /* error message to return via mm_log() */ sprintf (tmp,"*%.128s: %.255s",err,cert ? buf : "???"); return ssl_last_error = cpystr (tmp); } return NIL; } /* SSL certificate verification callback * Accepts: error flag * X509 context * Returns: error flag */ static int ssl_open_verify (int ok,X509_STORE_CTX *ctx) { char *err,cert[256],tmp[MAILTMPLEN]; sslcertificatequery_t scq = (sslcertificatequery_t) mail_parameters (NIL,GET_SSLCERTIFICATEQUERY,NIL); if (!ok) { /* in case failure */ err = (char *) X509_verify_cert_error_string (X509_STORE_CTX_get_error (ctx)); X509_NAME_oneline (X509_get_subject_name (X509_STORE_CTX_get_current_cert (ctx)),cert,255); if (!scq) { /* mm_log() error message if no callback */ sprintf (tmp,"*%.128s: %.255s",err,cert); ssl_last_error = cpystr (tmp); } /* ignore error if application says to */ else if ((*scq) (err,ssl_last_host,cert)) ok = T; /* application wants punt */ else ssl_last_error = cpystr (""); } return ok; } /* SSL validate certificate * Accepts: certificate * host to validate against * Returns: NIL if validated, else string of error message */ static char *ssl_validate_cert (X509 *cert,char *host) { int i,n; char *s=NULL,*t,*ret; void *ext; GENERAL_NAME *name; X509_NAME *cname; X509_NAME_ENTRY *e; char buf[256]; /* make sure have a certificate */ if (!cert) ret = "No certificate from server"; /* and that it has a name */ else if (!(cname = X509_get_subject_name(cert))) ret = "No name in certificate"; /* locate CN */ else{ if((e = X509_NAME_get_entry(cname, X509_NAME_entry_count(cname)-1)) != NULL){ X509_NAME_get_text_by_OBJ(cname, X509_NAME_ENTRY_get_object(e), buf, sizeof(buf)); s = (char *) buf; } else s = NULL; } if (s != NULL) { /* host name matches pattern? */ ret = ssl_compare_hostnames (host,s) ? NIL : "Server name does not match certificate"; /* if mismatch, see if in extensions */ if (ret && (ext = X509_get_ext_d2i (cert,NID_subject_alt_name,NIL,NIL)) && (n = sk_GENERAL_NAME_num (ext))) /* older versions of OpenSSL use "ia5" instead of dNSName */ for (i = 0; ret && (i < n); i++) if ((name = sk_GENERAL_NAME_value (ext,i)) && (name->type = GEN_DNS) && (s = name->d.ia5->data) && ssl_compare_hostnames (host,s)) ret = NIL; } else ret = "Unable to locate common name in certificate"; return ret; } /* Case-independent wildcard pattern match * Accepts: base string * pattern string * Returns: T if pattern matches base, else NIL */ static long ssl_compare_hostnames (unsigned char *s,unsigned char *pat) { long ret = NIL; switch (*pat) { case '*': /* wildcard */ if (pat[1]) { /* there must be a pattern suffix */ /* there is, scan base against it */ do if (ssl_compare_hostnames (s,pat+1)) ret = LONGT; while (!ret && (*s != '.') && *s++); } break; case '\0': /* end of pattern */ if (!*s) ret = LONGT; /* success if base is also at end */ break; default: /* non-wildcard, recurse if match */ if (!compare_uchar (*pat,*s)) ret = ssl_compare_hostnames (s+1,pat+1); break; } return ret; } /* SSL receive line * Accepts: SSL stream * Returns: text line string or NIL if failure */ char *ssl_getline (SSLSTREAM *stream) { unsigned long n,contd; char *ret = ssl_getline_work (stream,&n,&contd); if (ret && contd) { /* got a line needing continuation? */ STRINGLIST *stl = mail_newstringlist (); STRINGLIST *stc = stl; do { /* collect additional lines */ stc->text.data = (unsigned char *) ret; stc->text.size = n; stc = stc->next = mail_newstringlist (); ret = ssl_getline_work (stream,&n,&contd); } while (ret && contd); if (ret) { /* stash final part of line on list */ stc->text.data = (unsigned char *) ret; stc->text.size = n; /* determine how large a buffer we need */ for (n = 0, stc = stl; stc; stc = stc->next) n += stc->text.size; ret = fs_get (n + 1); /* copy parts into buffer */ for (n = 0, stc = stl; stc; n += stc->text.size, stc = stc->next) memcpy (ret + n,stc->text.data,stc->text.size); ret[n] = '\0'; } mail_free_stringlist (&stl);/* either way, done with list */ } return ret; } /* SSL receive line or partial line * Accepts: SSL stream * pointer to return size * pointer to return continuation flag * Returns: text line string, size and continuation flag, or NIL if failure */ static char *ssl_getline_work (SSLSTREAM *stream,unsigned long *size, long *contd) { unsigned long n; char *s,*ret,c,d; *contd = NIL; /* assume no continuation */ /* make sure have data */ if (!ssl_getdata (stream)) return NIL; for (s = stream->iptr, n = 0, c = '\0'; stream->ictr--; n++, c = d) { d = *stream->iptr++; /* slurp another character */ if ((c == '\015') && (d == '\012')) { ret = (char *) fs_get (n--); memcpy (ret,s,*size = n); /* copy into a free storage string */ ret[n] = '\0'; /* tie off string with null */ return ret; } } /* copy partial string from buffer */ memcpy ((ret = (char *) fs_get (n)),s,*size = n); /* get more data from the net */ if (!ssl_getdata (stream)) fs_give ((void **) &ret); /* special case of newline broken by buffer */ else if ((c == '\015') && (*stream->iptr == '\012')) { stream->iptr++; /* eat the line feed */ stream->ictr--; ret[*size = --n] = '\0'; /* tie off string with null */ } else *contd = LONGT; /* continuation needed */ return ret; } /* SSL receive buffer * Accepts: SSL stream * size in bytes * buffer to read into * Returns: T if success, NIL otherwise */ long ssl_getbuffer (SSLSTREAM *stream,unsigned long size,char *buffer) { unsigned long n; while (size > 0) { /* until request satisfied */ if (!ssl_getdata (stream)) return NIL; n = min (size,stream->ictr);/* number of bytes to transfer */ /* do the copy */ memcpy (buffer,stream->iptr,n); buffer += n; /* update pointer */ stream->iptr += n; size -= n; /* update # of bytes to do */ stream->ictr -= n; } buffer[0] = '\0'; /* tie off string */ return T; } /* SSL receive data * Accepts: TCP/IP stream * Returns: T if success, NIL otherwise */ #ifdef FD_SETSIZE #undef FD_SETSIZE #endif /* FD_SETSIZE */ #define FD_SETSIZE 16384 long ssl_getdata (SSLSTREAM *stream) { int i,sock; fd_set fds,efds; struct timeval tmo; tcptimeout_t tmoh = (tcptimeout_t) mail_parameters (NIL,GET_TIMEOUT,NIL); long ttmo_read = (long) mail_parameters (NIL,GET_READTIMEOUT,NIL); time_t t = time (0); blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL); if (!stream->con || ((sock = SSL_get_fd (stream->con)) < 0)) return NIL; /* tcp_unix should have prevented this */ if (sock >= FD_SETSIZE) fatal ("unselectable socket in ssl_getdata()"); (*bn) (BLOCK_TCPREAD,NIL); while (stream->ictr < 1) { /* if nothing in the buffer */ time_t tl = time (0); /* start of request */ time_t now = tl; int ti = ttmo_read ? now + ttmo_read : 0; if (SSL_pending (stream->con)) i = 1; else { if (tcpdebug) mm_log ("Reading SSL data",TCPDEBUG); tmo.tv_usec = 0; FD_ZERO (&fds); /* initialize selection vector */ FD_ZERO (&efds); /* handle errors too */ FD_SET (sock,&fds); /* set bit in selection vector */ FD_SET (sock,&efds); /* set bit in error selection vector */ errno = NIL; /* block and read */ do { /* block under timeout */ tmo.tv_sec = ti ? ti - now : 0; i = select (sock+1,&fds,0,&efds,ti ? &tmo : 0); now = time (0); /* fake timeout if interrupt & time expired */ if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0; } while ((i < 0) && (errno == EINTR)); } if (i) { /* non-timeout result from select? */ errno = 0; /* just in case */ if (i > 0) /* read what we can */ while (((i = SSL_read (stream->con,stream->ibuf,SSLBUFLEN)) < 0) && ((errno == EINTR) || (SSL_get_error (stream->con,i) == SSL_ERROR_WANT_READ))); if (i <= 0) { /* error seen? */ if (tcpdebug) { char *s,tmp[MAILTMPLEN]; if (i) sprintf (s = tmp,"SSL data read I/O error %d SSL error %d", errno,SSL_get_error (stream->con,i)); else s = "SSL data read end of file"; mm_log (s,TCPDEBUG); } return ssl_abort (stream); } stream->iptr = stream->ibuf;/* point at TCP buffer */ stream->ictr = i; /* set new byte count */ if (tcpdebug) mm_log ("Successfully read SSL data",TCPDEBUG); } /* timeout, punt unless told not to */ else if (!tmoh || !(*tmoh) (now - t,now - tl, stream->tcpstream->host)) { if (tcpdebug) mm_log ("SSL data read timeout",TCPDEBUG); return ssl_abort (stream); } } (*bn) (BLOCK_NONE,NIL); return T; } /* SSL send string as record * Accepts: SSL stream * string pointer * Returns: T if success else NIL */ long ssl_soutr (SSLSTREAM *stream,char *string) { return ssl_sout (stream,string,(unsigned long) strlen (string)); } /* SSL send string * Accepts: SSL stream * string pointer * byte count * Returns: T if success else NIL */ long ssl_sout (SSLSTREAM *stream,char *string,unsigned long size) { long i; blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL); if (!stream->con) return NIL; (*bn) (BLOCK_TCPWRITE,NIL); if (tcpdebug) mm_log ("Writing to SSL",TCPDEBUG); /* until request satisfied */ for (i = 0; size > 0; string += i,size -= i) /* write as much as we can */ if ((i = SSL_write (stream->con,string,(int) min (SSLBUFLEN,size))) < 0) { if (tcpdebug) { char tmp[MAILTMPLEN]; sprintf (tmp,"SSL data write I/O error %d SSL error %d", errno,SSL_get_error (stream->con,i)); mm_log (tmp,TCPDEBUG); } return ssl_abort (stream);/* write failed */ } if (tcpdebug) mm_log ("successfully wrote to TCP",TCPDEBUG); (*bn) (BLOCK_NONE,NIL); return LONGT; /* all done */ } /* SSL close * Accepts: SSL stream */ void ssl_close (SSLSTREAM *stream) { ssl_abort (stream); /* nuke the stream */ fs_give ((void **) &stream); /* flush the stream */ } /* SSL abort stream * Accepts: SSL stream * Returns: NIL always */ static long ssl_abort (SSLSTREAM *stream) { blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL); if (stream->con) { /* close SSL connection */ SSL_shutdown (stream->con); SSL_free (stream->con); stream->con = NIL; } if (stream->context) { /* clean up context */ SSL_CTX_free (stream->context); stream->context = NIL; } if (stream->tcpstream) { /* close TCP stream */ tcp_close (stream->tcpstream); stream->tcpstream = NIL; } (*bn) (BLOCK_NONE,NIL); return NIL; } /* SSL get host name * Accepts: SSL stream * Returns: host name for this stream */ char *ssl_host (SSLSTREAM *stream) { return stream ? tcp_host (stream->tcpstream) : "UNKNOWN"; } /* SSL get remote host name * Accepts: SSL stream * Returns: host name for this stream */ char *ssl_remotehost (SSLSTREAM *stream) { return tcp_remotehost (stream->tcpstream); } /* SSL return port for this stream * Accepts: SSL stream * Returns: port number for this stream */ unsigned long ssl_port (SSLSTREAM *stream) { return tcp_port (stream->tcpstream); } /* SSL get local host name * Accepts: SSL stream * Returns: local host name */ char *ssl_localhost (SSLSTREAM *stream) { return tcp_localhost (stream->tcpstream); } #ifdef SSL_CERT_DIRECTORY #undef SSL_CERT_DIRECTORY #endif /* SSL_CERT_DIRECTORY */ #define SSL_CERT_DIRECTORY "C:\\\\libressl\\ssl\\certs" #ifdef SSL_KEY_DIRECTORY #undef SSL_KEY_DIRECTORY #endif /* SSL_KEY_DIRECTORY */ #define SSL_KEY_DIRECTORY "C:\\\\libressl\\ssl\\private" /* Start TLS * Accepts: /etc/services service name * Returns: cpystr'd error string if TLS failed, else NIL for success */ char *ssl_start_tls (char *server) { char tmp[MAILTMPLEN]; struct stat sbuf; if (sslstdio) return cpystr ("Already in an SSL session"); if (start_tls) return cpystr ("TLS already started"); if (server) { /* build specific certificate/key file name */ sprintf (tmp,"%s\\%s-%s.pem",SSL_CERT_DIRECTORY,server,tcp_serveraddr ()); if (stat (tmp,&sbuf)) { /* use non-specific name if no specific file */ sprintf (tmp,"%s\\%s.pem",SSL_CERT_DIRECTORY,server); if (stat (tmp,&sbuf)) return cpystr ("Server certificate not installed"); } start_tls = server; /* switch to STARTTLS mode */ } return NIL; } /* Init server for SSL * Accepts: server name */ void ssl_server_init (char *server) { char cert[MAILTMPLEN],key[MAILTMPLEN]; unsigned long i; struct stat sbuf; SSLSTREAM *stream = (SSLSTREAM *) memset (fs_get (sizeof (SSLSTREAM)),0, sizeof (SSLSTREAM)); ssl_onceonlyinit (); /* make sure algorithms added */ #ifdef OPENSSL_1_1_0 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL); OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS|OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL); #else ERR_load_crypto_strings (); SSL_load_error_strings (); #endif /* OPENSSL_1_1_0 */ /* build specific certificate/key file names */ sprintf (cert,"%s\\%s-%s.pem",SSL_CERT_DIRECTORY,server,tcp_serveraddr ()); sprintf (key,"%s\\%s-%s.pem",SSL_KEY_DIRECTORY,server,tcp_serveraddr ()); /* use non-specific name if no specific cert */ if (stat (cert,&sbuf)) sprintf (cert,"%s\\%s.pem",SSL_CERT_DIRECTORY,server); if (stat (key,&sbuf)) { /* use non-specific name if no specific key */ sprintf (key,"%s\\%s.pem",SSL_KEY_DIRECTORY,server); /* use cert file as fallback for key */ if (stat (key,&sbuf)) strcpy (key,cert); } /* create context */ #ifdef OPENSSL_1_1_0 if (!(stream->context = SSL_CTX_new (start_tls ? TLS_server_method () : SSLv23_server_method ()))) #else if (!(stream->context = SSL_CTX_new (start_tls ? TLSv1_server_method () : SSLv23_server_method ()))) #endif /* OPENSSL_1_1_0 */ syslog (LOG_ALERT,"Unable to create SSL context, host=%.80s", tcp_clienthost ()); else { /* set context options */ SSL_CTX_set_options (stream->context,SSL_OP_ALL); /* set cipher list */ if (!SSL_CTX_set_cipher_list (stream->context,SSLCIPHERLIST)) syslog (LOG_ALERT,"Unable to set cipher list %.80s, host=%.80s", SSLCIPHERLIST,tcp_clienthost ()); /* load certificate */ else if (!SSL_CTX_use_certificate_chain_file (stream->context,cert)) syslog (LOG_ALERT,"Unable to load certificate from %.80s, host=%.80s", cert,tcp_clienthost ()); /* load key */ else if (!(SSL_CTX_use_RSAPrivateKey_file (stream->context,key, SSL_FILETYPE_PEM))) syslog (LOG_ALERT,"Unable to load private key from %.80s, host=%.80s", key,tcp_clienthost ()); else { /* generate key if needed */ #ifdef OPENSSL_1_1_0 if (0) ssl_genkey(stream->context, 0, 0); #else if (SSL_CTX_need_tmp_RSA (stream->context)) SSL_CTX_set_tmp_rsa_callback (stream->context,ssl_genkey); #endif /* OPENSSL_1_1_0 */ /* create new SSL connection */ if (!(stream->con = SSL_new (stream->context))) syslog (LOG_ALERT,"Unable to create SSL connection, host=%.80s", tcp_clienthost ()); else { /* set file descriptor */ SSL_set_fd (stream->con,0); /* all OK if accepted */ if (SSL_accept (stream->con) < 0) syslog (LOG_INFO,"Unable to accept SSL connection, host=%.80s", tcp_clienthost ()); else { /* server set up */ sslstdio = (SSLSTDIOSTREAM *) memset (fs_get (sizeof(SSLSTDIOSTREAM)),0,sizeof (SSLSTDIOSTREAM)); sslstdio->sslstream = stream; /* available space in output buffer */ sslstdio->octr = SSLBUFLEN; /* current output buffer pointer */ sslstdio->optr = sslstdio->obuf; /* allow plaintext if disable value was 2 */ if ((long) mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL) > 1) mail_parameters (NIL,SET_DISABLEPLAINTEXT,NIL); /* unhide PLAIN SASL authenticator */ mail_parameters (NIL,UNHIDE_AUTHENTICATOR,"PLAIN"); mail_parameters (NIL,UNHIDE_AUTHENTICATOR,"LOGIN"); return; } } } } while ((i = ERR_get_error ()) != 0L) /* SSL failure */ syslog (LOG_ERR,"SSL error status: %.80s",ERR_error_string (i,NIL)); ssl_close (stream); /* punt stream */ exit (1); /* punt this program too */ } /* Generate one-time key for server * Accepts: SSL connection * export flag * keylength * Returns: generated key, always */ static RSA *ssl_genkey (SSL_CTX_TYPE *con,int export,int keylength) { unsigned long i; static RSA *key = NIL; if (!key) { /* if don't have a key already */ /* generate key */ #ifdef OPENSSL_1_1_0 BIGNUM *e = BN_new(); if (!RSA_generate_key_ex (key, export ? keylength : 1024, e,NIL)) { #else if (!(key = RSA_generate_key (export ? keylength : 1024,RSA_F4,NIL,NIL))) { #endif /* OPENSSL_1_1_0 */ syslog (LOG_ALERT,"Unable to generate temp key, host=%.80s", tcp_clienthost ()); while ((i = ERR_get_error ()) != 0L) syslog (LOG_ALERT,"SSL error status: %s",ERR_error_string (i,NIL)); exit (1); } #ifdef OPENSSL_1_1_0 BN_free(e); e = NULL; #endif /* OPENSSL_1_1_0 */ } return key; } /* Wait for stdin input * Accepts: timeout in seconds * Returns: T if have input on stdin, else NIL */ long ssl_server_input_wait (long seconds) { int i,sock; fd_set fds,efd; struct timeval tmo; SSLSTREAM *stream; if (!sslstdio) return server_input_wait (seconds); /* input available in buffer */ if (((stream = sslstdio->sslstream)->ictr > 0) || !stream->con || ((sock = SSL_get_fd (stream->con)) < 0)) return LONGT; /* sock ought to be 0 always */ if (sock >= FD_SETSIZE) fatal ("unselectable socket in ssl_getdata()"); /* input available from SSL */ if (SSL_pending (stream->con) && ((i = SSL_read (stream->con,stream->ibuf,SSLBUFLEN)) > 0)) { stream->iptr = stream->ibuf;/* point at TCP buffer */ stream->ictr = i; /* set new byte count */ return LONGT; } FD_ZERO (&fds); /* initialize selection vector */ FD_ZERO (&efd); /* initialize selection vector */ FD_SET (sock,&fds); /* set bit in selection vector */ FD_SET (sock,&efd); /* set bit in selection vector */ tmo.tv_sec = seconds; tmo.tv_usec = 0; /* see if input available from the socket */ return select (sock+1,&fds,0,&efd,&tmo) ? LONGT : NIL; } #include "sslstdio.c" #else /* ENABLE_WINDOWS_LIBRESSL */ #define SECURITY_WIN32 #include #include #define SSLBUFLEN 8192 /* SSL I/O stream */ typedef struct ssl_stream { TCPSTREAM *tcpstream; /* TCP stream */ CredHandle cred; /* SSL credentials */ CtxtHandle context; /* SSL context */ /* stream encryption sizes */ SecPkgContext_StreamSizes sizes; size_t bufsize; int ictr; /* input counter */ char *iptr; /* input pointer */ int iextractr; /* extra input counter */ char *iextraptr; /* extra input pointer */ char *ibuf; /* input buffer */ char *obuf; /* output buffer */ } SSLSTREAM; #include "sslio.h" /* Function prototypes */ static SSLSTREAM *ssl_start(TCPSTREAM *tstream,char *host,unsigned long flags); static char *ssl_analyze_status (SECURITY_STATUS err,char *buf); static char *ssl_getline_work (SSLSTREAM *stream,unsigned long *size, long *contd); static long ssl_abort (SSLSTREAM *stream); /* Secure Sockets Layer network driver dispatch */ static struct ssl_driver ssldriver = { ssl_open, /* open connection */ ssl_aopen, /* open preauthenticated connection */ ssl_getline, /* get a line */ ssl_getbuffer, /* get a buffer */ ssl_soutr, /* output pushed data */ ssl_sout, /* output string */ ssl_close, /* close connection */ ssl_host, /* return host name */ ssl_remotehost, /* return remote host name */ ssl_port, /* return port number */ ssl_localhost /* return local host name */ }; /* security function table */ static SecurityFunctionTable *sft = NIL; static unsigned long ssltsz = 0;/* SSL maximum token length */ /* Define crypt32.dll stuff here in case a pre-IE5 Win9x system */ typedef DWORD (CALLBACK *CNTS) (DWORD,PCERT_NAME_BLOB,DWORD,LPSTR,DWORD); typedef BOOL (CALLBACK *CGCC) (HCERTCHAINENGINE,PCCERT_CONTEXT,LPFILETIME, HCERTSTORE,PCERT_CHAIN_PARA,DWORD,LPVOID, PCCERT_CHAIN_CONTEXT *); typedef BOOL (CALLBACK *CVCCP) (LPCSTR,PCCERT_CHAIN_CONTEXT, PCERT_CHAIN_POLICY_PARA, PCERT_CHAIN_POLICY_STATUS); typedef VOID (CALLBACK *CFCC) (PCCERT_CHAIN_CONTEXT); typedef BOOL (CALLBACK *CFCCX) (PCCERT_CONTEXT); static CNTS certNameToStr = NIL; static CGCC certGetCertificateChain = NIL; static CVCCP certVerifyCertificateChainPolicy = NIL; static CFCC certFreeCertificateChain = NIL; static CFCCX certFreeCertificateContext = NIL; /* One-time SSL initialization */ static int sslonceonly = 0; void ssl_onceonlyinit (void) { if (!sslonceonly++) { /* only need to call it once */ HINSTANCE lib; FARPROC pi; ULONG np; SecPkgInfo *pp; int i; /* get security library */ if (((lib = LoadLibrary ("schannel.dll")) || (lib = LoadLibrary ("security.dll"))) && (pi = GetProcAddress (lib,SECURITY_ENTRYPOINT)) && (sft = (SecurityFunctionTable *) pi ()) && !(sft->EnumerateSecurityPackages (&np,&pp))) { /* look for an SSL package */ for (i = 0; (i < (int) np); i++) if (!strcmp (pp[i].Name,UNISP_NAME)) { /* note maximum token size and name */ ssltsz = pp[i].cbMaxToken; /* apply runtime linkage */ mail_parameters (NIL,SET_SSLDRIVER,(void *) &ssldriver); mail_parameters (NIL,SET_SSLSTART,(void *) ssl_start); if ((lib = LoadLibrary ("crypt32.dll")) && (certGetCertificateChain = (CGCC) GetProcAddress (lib,"CertGetCertificateChain")) && (certVerifyCertificateChainPolicy = (CVCCP) GetProcAddress (lib,"CertVerifyCertificateChainPolicy")) && (certFreeCertificateChain = (CFCC) GetProcAddress (lib,"CertFreeCertificateChain")) && (certFreeCertificateContext = (CFCCX) GetProcAddress (lib,"CertFreeCertificateContext"))) certNameToStr = (CNTS) GetProcAddress (lib,"CertNameToStrA"); return; /* all done */ } } } } /* SSL open * Accepts: host name * contact service name * contact port number * Returns: SSL stream if success else NIL */ SSLSTREAM *ssl_open (char *host,char *service,unsigned long port) { TCPSTREAM *stream = tcp_open (host,service,port); return stream ? ssl_start (stream,host,port) : NIL; } /* SSL authenticated open * Accepts: host name * service name * returned user name buffer * Returns: SSL stream if success else NIL */ SSLSTREAM *ssl_aopen (NETMBX *mb,char *service,char *usrbuf) { return NIL; /* don't use this mechanism with SSL */ } /* Start SSL/TLS negotiations * Accepts: open TCP stream of session * user's host name * flags * Returns: SSL stream if success else NIL */ static SSLSTREAM *ssl_start (TCPSTREAM *tstream,char *host,unsigned long flags) { SECURITY_STATUS e; ULONG a; TimeStamp t; SecBuffer ibuf[2],obuf[1]; SecBufferDesc ibufs,obufs; SCHANNEL_CRED tlscred; CERT_CONTEXT *cert = NIL; CERT_CHAIN_PARA chparam; CERT_CHAIN_CONTEXT *chain; SSL_EXTRA_CERT_CHAIN_POLICY_PARA policy; CERT_CHAIN_POLICY_PARA polparam; CERT_CHAIN_POLICY_STATUS status; char tmp[MAILTMPLEN],certname[256]; char *reason = NIL; ULONG req = ISC_REQ_REPLAY_DETECT | ISC_REQ_SEQUENCE_DETECT | ISC_REQ_CONFIDENTIALITY | ISC_REQ_USE_SESSION_KEY | ISC_REQ_ALLOCATE_MEMORY | ISC_REQ_STREAM | ISC_REQ_EXTENDED_ERROR | ISC_REQ_MANUAL_CRED_VALIDATION; LPSTR usage[] = { szOID_PKIX_KP_SERVER_AUTH, szOID_SERVER_GATED_CRYPTO, szOID_SGC_NETSCAPE }; PWSTR whost = NIL; char *buf = (char *) fs_get (ssltsz); unsigned long size = 0; sslcertificatequery_t scq = (sslcertificatequery_t) mail_parameters (NIL,GET_SSLCERTIFICATEQUERY,NIL); sslfailure_t sf = (sslfailure_t) mail_parameters (NIL,GET_SSLFAILURE,NIL); SSLSTREAM *stream = (SSLSTREAM *) memset (fs_get (sizeof (SSLSTREAM)),0, sizeof (SSLSTREAM)); stream->tcpstream = tstream; /* bind TCP stream */ /* initialize TLS credential */ memset (&tlscred,0,sizeof (SCHANNEL_CRED)); tlscred.dwVersion = SCHANNEL_CRED_VERSION; tlscred.grbitEnabledProtocols = SP_PROT_TLS1; /* acquire credentials */ if (sft->AcquireCredentialsHandle (NIL,UNISP_NAME,SECPKG_CRED_OUTBOUND,NIL,(flags & NET_TLSCLIENT) ? &tlscred : NIL,NIL,NIL,&stream->cred,&t) != SEC_E_OK) reason = "Acquire credentials handle failed"; else while (!reason) { /* negotiate security context */ /* initialize buffers */ ibuf[0].cbBuffer = size; ibuf[0].pvBuffer = buf; ibuf[1].cbBuffer = 0; ibuf[1].pvBuffer = NIL; obuf[0].cbBuffer = 0; obuf[0].pvBuffer = NIL; ibuf[0].BufferType = obuf[0].BufferType = SECBUFFER_TOKEN; ibuf[1].BufferType = SECBUFFER_EMPTY; /* initialize buffer descriptors */ ibufs.ulVersion = obufs.ulVersion = SECBUFFER_VERSION; ibufs.cBuffers = 2; obufs.cBuffers = 1; ibufs.pBuffers = ibuf; obufs.pBuffers = obuf; /* negotiate security */ e = sft->InitializeSecurityContext (&stream->cred,size ? &stream->context : NIL,host,req,0, SECURITY_NETWORK_DREP,size? &ibufs:NIL,0,&stream->context,&obufs,&a,&t); /* have an output buffer we need to send? */ if (obuf[0].pvBuffer && obuf[0].cbBuffer) { if (!tcp_sout (stream->tcpstream,obuf[0].pvBuffer,obuf[0].cbBuffer)) reason = "Unexpected TCP output disconnect"; /* free the buffer */ sft->FreeContextBuffer (obuf[0].pvBuffer); } if (!reason) switch (e) { /* negotiation state */ case SEC_I_INCOMPLETE_CREDENTIALS: break; /* server wants client auth */ case SEC_I_CONTINUE_NEEDED: if (size) { /* continue, read any data? */ /* yes, anything regurgiated back to us? */ if (ibuf[1].BufferType == SECBUFFER_EXTRA) { /* yes, set this as the new data */ memmove (buf,buf + size - ibuf[1].cbBuffer,ibuf[1].cbBuffer); size = ibuf[1].cbBuffer; break; } size = 0; /* otherwise, read more stuff from server */ } case SEC_E_INCOMPLETE_MESSAGE: /* need to read more data from server */ if (!tcp_getdata (stream->tcpstream)) reason = "Unexpected TCP input disconnect"; else { memcpy (buf+size,stream->tcpstream->iptr,stream->tcpstream->ictr); size += stream->tcpstream->ictr; /* empty it from TCP's buffers */ stream->tcpstream->iptr += stream->tcpstream->ictr; stream->tcpstream->ictr = 0; } break; case SEC_E_OK: /* success, any data to be regurgitated? */ if (ibuf[1].BufferType == SECBUFFER_EXTRA) { /* yes, set this as the new data */ memmove (stream->tcpstream->iptr = stream->tcpstream->ibuf, buf + size - ibuf[1].cbBuffer,ibuf[1].cbBuffer); stream->tcpstream->ictr = ibuf[1].cbBuffer; } if (certNameToStr && !(flags & NET_NOVALIDATECERT)) { /* need validation, make wchar of host */ if (!((size = MultiByteToWideChar (CP_ACP,0,host,-1,NIL,0)) && (whost = (PWSTR) fs_get (size*sizeof (WCHAR))) && MultiByteToWideChar (CP_ACP,0,host,-1,whost,size))) fatal ("Can't make wchar of host name!"); /* get certificate */ if ((sft->QueryContextAttributes (&stream->context,SECPKG_ATTR_REMOTE_CERT_CONTEXT,&cert) != SEC_E_OK) || !cert) { reason = "*Unable to get certificate"; strcpy (certname,""); } else { /* get certificate subject name */ (*certNameToStr) (X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, &cert->pCertInfo->Subject,CERT_X500_NAME_STR, certname,255); /* build certificate chain */ memset (&chparam,0,sizeof (chparam)); chparam.cbSize = sizeof (chparam); chparam.RequestedUsage.dwType = USAGE_MATCH_TYPE_OR; chparam.RequestedUsage.Usage.rgpszUsageIdentifier = usage; chparam.RequestedUsage.Usage.cUsageIdentifier = sizeof (usage) / sizeof (LPSTR); if (!(*certGetCertificateChain) (NIL,cert,NIL,cert->hCertStore,&chparam,NIL,NIL,&chain)) reason = ssl_analyze_status (GetLastError (),tmp); else { /* validate certificate chain */ memset (&policy,0,sizeof (SSL_EXTRA_CERT_CHAIN_POLICY_PARA)); policy.cbStruct = sizeof (SSL_EXTRA_CERT_CHAIN_POLICY_PARA); policy.dwAuthType = AUTHTYPE_SERVER; policy.fdwChecks = NIL; policy.pwszServerName = whost; memset (&polparam,0,sizeof (polparam)); polparam.cbSize = sizeof (polparam); polparam.pvExtraPolicyPara = &policy; memset (&status,0,sizeof (status)); status.cbSize = sizeof (status); if (!(*certVerifyCertificateChainPolicy) (CERT_CHAIN_POLICY_SSL,chain,&polparam,&status)) reason = ssl_analyze_status (GetLastError (),tmp); else if (status.dwError) reason = ssl_analyze_status (status.dwError,tmp); (*certFreeCertificateChain) (chain); } (*certFreeCertificateContext) (cert); } if (whost) fs_give ((void **) &whost); if (reason) { /* got an error? */ /* application callback */ if (scq) reason = (*scq) ((*reason == '*') ? reason + 1 : reason, host,certname) ? NIL : ""; else if (*certname) { /* error message to return via mm_log() */ sprintf (buf,"*%.128s: %.255s", (*reason == '*') ? reason + 1 : reason,certname); reason = buf; } } } if (reason || (reason = ssl_analyze_status (sft->QueryContextAttributes (&stream->context,SECPKG_ATTR_STREAM_SIZES,&stream->sizes),buf))) break; /* error in certificate or getting sizes */ fs_give ((void **) &buf); /* flush temporary buffer */ /* make maximum-sized buffers */ stream->bufsize = stream->sizes.cbHeader + stream->sizes.cbMaximumMessage + stream->sizes.cbTrailer; if (stream->sizes.cbMaximumMessage < SSLBUFLEN) fatal ("cbMaximumMessage is less than SSLBUFLEN!"); else if (stream->sizes.cbMaximumMessage < 16384) { sprintf (tmp,"WINDOWS BUG: cbMaximumMessage = %ld, should be 16384", (long) stream->sizes.cbMaximumMessage); mm_log (tmp,NIL); } stream->ibuf = (char *) fs_get (stream->bufsize); stream->obuf = (char *) fs_get (stream->bufsize); return stream; default: reason = ssl_analyze_status (e,buf); } } ssl_close (stream); /* failed to do SSL */ stream = NIL; /* no stream returned */ switch (*reason) { /* analyze reason */ case '*': /* certificate failure */ ++reason; /* skip over certificate failure indication */ /* pass to error callback */ if (sf) (*sf) (host,reason,flags); else { /* no error callback, build error message */ sprintf (tmp,"Certificate failure for %.80s: %.512s",host,reason); mm_log (tmp,ERROR); } case '\0': /* user answered no to certificate callback */ if (flags & NET_TRYSSL) /* return dummy stream to stop tryssl */ stream = (SSLSTREAM *) memset (fs_get (sizeof (SSLSTREAM)),0, sizeof (SSLSTREAM)); break; default: /* non-certificate failure */ if (flags & NET_TRYSSL); /* no error output if tryssl */ /* pass to error callback */ else if (sf) (*sf) (host,reason,flags); else { /* no error callback, build error message */ sprintf (tmp,"TLS/SSL failure for %.80s: %.512s",host,reason); mm_log (tmp,ERROR); } break; } fs_give ((void **) &buf); /* flush temporary buffer */ return stream; } /* Generate error text from SSL error code * Accepts: SSL status * scratch buffer * Returns: text if error status, else NIL */ static char *ssl_analyze_status (SECURITY_STATUS err,char *buf) { switch (err) { case SEC_E_OK: /* no error */ case SEC_I_CONTINUE_NEEDED: case SEC_I_INCOMPLETE_CREDENTIALS: case SEC_E_INCOMPLETE_MESSAGE: return NIL; case SEC_E_NO_AUTHENTICATING_AUTHORITY: mm_log ("unexpected SEC_E_NO_AUTHENTICATING_AUTHORITY",NIL); return "*No authority could be contacted for authentication"; case SEC_E_WRONG_PRINCIPAL: mm_log ("unexpected SEC_E_WRONG_PRINCIPAL",NIL); case CERT_E_CN_NO_MATCH: return "*Server name does not match certificate"; case SEC_E_UNTRUSTED_ROOT: mm_log ("unexpected SEC_E_UNTRUSTED_ROOT",NIL); case CERT_E_UNTRUSTEDROOT: return "*Self-signed certificate or untrusted authority"; case SEC_E_CERT_EXPIRED: mm_log ("unexpected SEC_E_CERT_EXPIRED",NIL); case CERT_E_EXPIRED: return "*Certificate has expired"; case CERT_E_REVOKED: return "*Certificate revoked"; case SEC_E_INVALID_TOKEN: return "Invalid token, probably not an SSL server"; case SEC_E_UNSUPPORTED_FUNCTION: return "SSL not supported on this machine - upgrade your system software"; } sprintf (buf,"Unexpected SSPI or certificate error %lx - report this",err); return buf; } /* SSL receive line * Accepts: SSL stream * Returns: text line string or NIL if failure */ char *ssl_getline (SSLSTREAM *stream) { unsigned long n,contd; char *ret = ssl_getline_work (stream,&n,&contd); if (ret && contd) { /* got a line needing continuation? */ STRINGLIST *stl = mail_newstringlist (); STRINGLIST *stc = stl; do { /* collect additional lines */ stc->text.data = (unsigned char *) ret; stc->text.size = n; stc = stc->next = mail_newstringlist (); ret = ssl_getline_work (stream,&n,&contd); } while (ret && contd); if (ret) { /* stash final part of line on list */ stc->text.data = (unsigned char *) ret; stc->text.size = n; /* determine how large a buffer we need */ for (n = 0, stc = stl; stc; stc = stc->next) n += stc->text.size; ret = fs_get (n + 1); /* copy parts into buffer */ for (n = 0, stc = stl; stc; n += stc->text.size, stc = stc->next) memcpy (ret + n,stc->text.data,stc->text.size); ret[n] = '\0'; } mail_free_stringlist (&stl);/* either way, done with list */ } return ret; } /* SSL receive line or partial line * Accepts: SSL stream * pointer to return size * pointer to return continuation flag * Returns: text line string, size and continuation flag, or NIL if failure */ static char *ssl_getline_work (SSLSTREAM *stream,unsigned long *size, long *contd) { unsigned long n; char *s,*ret,c,d; *contd = NIL; /* assume no continuation */ /* make sure have data */ if (!ssl_getdata (stream)) return NIL; for (s = stream->iptr, n = 0, c = '\0'; stream->ictr--; n++, c = d) { d = *stream->iptr++; /* slurp another character */ if ((c == '\015') && (d == '\012')) { ret = (char *) fs_get (n--); memcpy (ret,s,*size = n); /* copy into a free storage string */ ret[n] = '\0'; /* tie off string with null */ return ret; } } /* copy partial string from buffer */ memcpy ((ret = (char *) fs_get (n)),s,*size = n); /* get more data from the net */ if (!ssl_getdata (stream)) fs_give ((void **) &ret); /* special case of newline broken by buffer */ else if ((c == '\015') && (*stream->iptr == '\012')) { stream->iptr++; /* eat the line feed */ stream->ictr--; ret[*size = --n] = '\0'; /* tie off string with null */ } else *contd = LONGT; /* continuation needed */ return ret; } /* SSL receive buffer * Accepts: SSL stream * size in bytes * buffer to read into * Returns: T if success, NIL otherwise */ long ssl_getbuffer (SSLSTREAM *stream,unsigned long size,char *buffer) { unsigned long n; while (size > 0) { /* until request satisfied */ if (!ssl_getdata (stream)) return NIL; n = min (size,stream->ictr);/* number of bytes to transfer */ /* do the copy */ memcpy (buffer,stream->iptr,n); buffer += n; /* update pointer */ stream->iptr += n; size -= n; /* update # of bytes to do */ stream->ictr -= n; } buffer[0] = '\0'; /* tie off string */ return T; } /* SSL receive data * Accepts: TCP/IP stream * Returns: T if success, NIL otherwise */ long ssl_getdata (SSLSTREAM *stream) { while (stream->ictr < 1) { /* decrypted buffer empty? */ SECURITY_STATUS status; SecBuffer buf[4]; SecBufferDesc msg; size_t i; size_t n = 0; /* initially no bytes to decrypt */ if (!stream->tcpstream) return NIL; do { /* yes, make sure have data from TCP */ if (stream->iextractr) { /* have previous unread data? */ memcpy (stream->ibuf + n,stream->iextraptr,stream->iextractr); n += stream->iextractr; /* update number of bytes read */ stream->iextractr = 0; /* no more extra data */ } else { /* read from TCP */ if (!tcp_getdata (stream->tcpstream)) return ssl_abort (stream); /* maximum amount of data to copy */ if (!(i = min (stream->bufsize - n,stream->tcpstream->ictr))) fatal ("incomplete SecBuffer exceeds maximum buffer size"); /* do the copy */ memcpy (stream->ibuf + n,stream->tcpstream->iptr,i); stream->tcpstream->iptr += i; stream->tcpstream->ictr -= i; n += i; /* update number of bytes to decrypt */ } buf[0].cbBuffer = n; /* first SecBuffer gets data */ buf[0].pvBuffer = stream->ibuf; buf[0].BufferType = SECBUFFER_DATA; /* subsequent ones are for spares */ buf[1].BufferType = buf[2].BufferType = buf[3].BufferType = SECBUFFER_EMPTY; msg.ulVersion = SECBUFFER_VERSION; msg.cBuffers = 4; /* number of SecBuffers */ msg.pBuffers = buf; /* first SecBuffer */ } while ((status = ((DECRYPT_MESSAGE_FN) sft->Reserved4) (&stream->context,&msg,0,NIL)) == SEC_E_INCOMPLETE_MESSAGE); switch (status) { case SEC_E_OK: /* won */ case SEC_I_RENEGOTIATE: /* won but lost it after this buffer */ /* hunt for a buffer */ for (i = 0; (i < 4) && (buf[i].BufferType != SECBUFFER_DATA) ; i++); if (i < 4) { /* found a buffer? */ /* yes, set up pointer and counter */ stream->iptr = buf[i].pvBuffer; stream->ictr = buf[i].cbBuffer; /* any unprocessed data? */ while (++i < 4) if (buf[i].BufferType == SECBUFFER_EXTRA) { /* yes, note for next time around */ stream->iextraptr = buf[i].pvBuffer; stream->iextractr = buf[i].cbBuffer; } } break; default: /* anything else means we've lost */ return ssl_abort (stream); } } return LONGT; } /* SSL send string as record * Accepts: SSL stream * string pointer * Returns: T if success else NIL */ long ssl_soutr (SSLSTREAM *stream,char *string) { return ssl_sout (stream,string,(unsigned long) strlen (string)); } /* SSL send string * Accepts: SSL stream * string pointer * byte count * Returns: T if success else NIL */ long ssl_sout (SSLSTREAM *stream,char *string,unsigned long size) { SecBuffer buf[4]; SecBufferDesc msg; char *s; size_t n; if (!stream->tcpstream) return NIL; /* until request satisfied */ for (s = stream->ibuf,n = 0; size;) { /* header */ buf[0].BufferType = SECBUFFER_STREAM_HEADER; memset (buf[0].pvBuffer = stream->obuf,0, buf[0].cbBuffer = stream->sizes.cbHeader); /* message (up to maximum size) */ buf[1].BufferType = SECBUFFER_DATA; memcpy (buf[1].pvBuffer = stream->obuf + stream->sizes.cbHeader,string, buf[1].cbBuffer = min (size,SSLBUFLEN)); /* trailer */ buf[2].BufferType = SECBUFFER_STREAM_TRAILER; memset (buf[2].pvBuffer = ((char *) buf[1].pvBuffer) + buf[1].cbBuffer,0, buf[2].cbBuffer = stream->sizes.cbTrailer); /* spare */ buf[3].BufferType = SECBUFFER_EMPTY; msg.ulVersion = SECBUFFER_VERSION; msg.cBuffers = 4; /* number of SecBuffers */ msg.pBuffers = buf; /* first SecBuffer */ string += buf[1].cbBuffer; size -= buf[1].cbBuffer; /* this many bytes processed */ /* encrypt and send message */ if ((((ENCRYPT_MESSAGE_FN) sft->Reserved3) (&stream->context,0,&msg,NIL) != SEC_E_OK) || !tcp_sout (stream->tcpstream,stream->obuf, buf[0].cbBuffer + buf[1].cbBuffer + buf[2].cbBuffer)) return ssl_abort (stream);/* encryption or sending failed */ } return LONGT; } /* SSL close * Accepts: SSL stream */ void ssl_close (SSLSTREAM *stream) { ssl_abort (stream); /* nuke the stream */ fs_give ((void **) &stream); /* flush the stream */ } /* SSL abort stream * Accepts: SSL stream * Returns: NIL always */ static long ssl_abort (SSLSTREAM *stream) { if (stream->tcpstream) { /* close TCP stream */ sft->DeleteSecurityContext (&stream->context); sft->FreeCredentialHandle (&stream->cred); tcp_close (stream->tcpstream); stream->tcpstream = NIL; } if (stream->ibuf) fs_give ((void **) &stream->ibuf); if (stream->obuf) fs_give ((void **) &stream->obuf); return NIL; } /* SSL get host name * Accepts: SSL stream * Returns: host name for this stream */ char *ssl_host (SSLSTREAM *stream) { return stream ? tcp_host (stream->tcpstream) : "UNKNOWN"; } /* SSL get remote host name * Accepts: SSL stream * Returns: host name for this stream */ char *ssl_remotehost (SSLSTREAM *stream) { return tcp_remotehost (stream->tcpstream); } /* SSL return port for this stream * Accepts: SSL stream * Returns: port number for this stream */ unsigned long ssl_port (SSLSTREAM *stream) { return tcp_port (stream->tcpstream); } /* SSL get local host name * Accepts: SSL stream * Returns: local host name */ char *ssl_localhost (SSLSTREAM *stream) { return tcp_localhost (stream->tcpstream); } #include "ssl_none.c" /* currently no server support */ #endif /* ENABLE_WINDOWS_LIBRESSL */