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author | Baptiste Daroussin <bapt@FreeBSD.org> | 2014-02-21 07:26:49 +0000 |
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committer | Baptiste Daroussin <bapt@FreeBSD.org> | 2014-02-21 07:26:49 +0000 |
commit | a9e8641da961bcf3d24afc85fd657f2083a872a2 (patch) | |
tree | 50c8cd4c6b55c353a3f982a5f9f8c8590d1ba5ec /contrib/dma/crypto.c | |
parent | 159dd56f947fb0d05692ca13ca4fcc389fd52dca (diff) | |
parent | c48517e8d3cc4e8abc200d7d5dffc340fc4f01c7 (diff) | |
download | src-a9e8641da961bcf3d24afc85fd657f2083a872a2.tar.gz src-a9e8641da961bcf3d24afc85fd657f2083a872a2.zip |
Import Dragonfly Mail Agent into base system
It is a small and lightweight Mail Transport Agent.
It accepts mails from locally installed Mail User Agents (MUA) and delivers the
mails either locally or to a remote destination. Remote delivery includes
several features like TLS/SSL support, SMTP authentication and NULLCLIENT.
Make dma conditional to new WITHOUT_DMA option and make it respect WITHOUT_MAIL
Reviewed by: peter
Discussed with: emaste, bz, peter
Notes
Notes:
svn path=/head/; revision=262282
Diffstat (limited to 'contrib/dma/crypto.c')
-rw-r--r-- | contrib/dma/crypto.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/contrib/dma/crypto.c b/contrib/dma/crypto.c new file mode 100644 index 000000000000..897b55bfdcfc --- /dev/null +++ b/contrib/dma/crypto.c @@ -0,0 +1,312 @@ +/* + * Copyright (c) 2008 The DragonFly Project. All rights reserved. + * + * This code is derived from software contributed to The DragonFly Project + * by Matthias Schmidt <matthias@dragonflybsd.org>, University of Marburg, + * Germany. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name of The DragonFly Project nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific, prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <openssl/x509.h> +#include <openssl/md5.h> +#include <openssl/ssl.h> +#include <openssl/err.h> +#include <openssl/pem.h> +#include <openssl/rand.h> + +#include <syslog.h> + +#include "dma.h" + +static int +init_cert_file(SSL_CTX *ctx, const char *path) +{ + int error; + + /* Load certificate into ctx */ + error = SSL_CTX_use_certificate_chain_file(ctx, path); + if (error < 1) { + syslog(LOG_ERR, "SSL: Cannot load certificate `%s': %s", path, ssl_errstr()); + return (-1); + } + + /* Add private key to ctx */ + error = SSL_CTX_use_PrivateKey_file(ctx, path, SSL_FILETYPE_PEM); + if (error < 1) { + syslog(LOG_ERR, "SSL: Cannot load private key `%s': %s", path, ssl_errstr()); + return (-1); + } + + /* + * Check the consistency of a private key with the corresponding + * certificate + */ + error = SSL_CTX_check_private_key(ctx); + if (error < 1) { + syslog(LOG_ERR, "SSL: Cannot check private key: %s", ssl_errstr()); + return (-1); + } + + return (0); +} + +int +smtp_init_crypto(int fd, int feature) +{ + SSL_CTX *ctx = NULL; +#if (OPENSSL_VERSION_NUMBER >= 0x00909000L) + const SSL_METHOD *meth = NULL; +#else + SSL_METHOD *meth = NULL; +#endif + X509 *cert; + int error; + + /* XXX clean up on error/close */ + /* Init SSL library */ + SSL_library_init(); + SSL_load_error_strings(); + + meth = TLSv1_client_method(); + + ctx = SSL_CTX_new(meth); + if (ctx == NULL) { + syslog(LOG_WARNING, "remote delivery deferred: SSL init failed: %s", ssl_errstr()); + return (1); + } + + /* User supplied a certificate */ + if (config.certfile != NULL) { + error = init_cert_file(ctx, config.certfile); + if (error) { + syslog(LOG_WARNING, "remote delivery deferred"); + return (1); + } + } + + /* + * If the user wants STARTTLS, we have to send EHLO here + */ + if (((feature & SECURETRANS) != 0) && + (feature & STARTTLS) != 0) { + /* TLS init phase, disable SSL_write */ + config.features |= NOSSL; + + send_remote_command(fd, "EHLO %s", hostname()); + if (read_remote(fd, 0, NULL) == 2) { + send_remote_command(fd, "STARTTLS"); + if (read_remote(fd, 0, NULL) != 2) { + if ((feature & TLS_OPP) == 0) { + syslog(LOG_ERR, "remote delivery deferred: STARTTLS not available: %s", neterr); + return (1); + } else { + syslog(LOG_INFO, "in opportunistic TLS mode, STARTTLS not available: %s", neterr); + return (0); + } + } + } + /* End of TLS init phase, enable SSL_write/read */ + config.features &= ~NOSSL; + } + + config.ssl = SSL_new(ctx); + if (config.ssl == NULL) { + syslog(LOG_NOTICE, "remote delivery deferred: SSL struct creation failed: %s", + ssl_errstr()); + return (1); + } + + /* Set ssl to work in client mode */ + SSL_set_connect_state(config.ssl); + + /* Set fd for SSL in/output */ + error = SSL_set_fd(config.ssl, fd); + if (error == 0) { + syslog(LOG_NOTICE, "remote delivery deferred: SSL set fd failed: %s", + ssl_errstr()); + return (1); + } + + /* Open SSL connection */ + error = SSL_connect(config.ssl); + if (error < 0) { + syslog(LOG_ERR, "remote delivery deferred: SSL handshake failed fatally: %s", + ssl_errstr()); + return (1); + } + + /* Get peer certificate */ + cert = SSL_get_peer_certificate(config.ssl); + if (cert == NULL) { + syslog(LOG_WARNING, "remote delivery deferred: Peer did not provide certificate: %s", + ssl_errstr()); + } + X509_free(cert); + + return (0); +} + +/* + * hmac_md5() taken out of RFC 2104. This RFC was written by H. Krawczyk, + * M. Bellare and R. Canetti. + * + * text pointer to data stream + * text_len length of data stream + * key pointer to authentication key + * key_len length of authentication key + * digest caller digest to be filled int + */ +void +hmac_md5(unsigned char *text, int text_len, unsigned char *key, int key_len, + unsigned char* digest) +{ + MD5_CTX context; + unsigned char k_ipad[65]; /* inner padding - + * key XORd with ipad + */ + unsigned char k_opad[65]; /* outer padding - + * key XORd with opad + */ + unsigned char tk[16]; + int i; + /* if key is longer than 64 bytes reset it to key=MD5(key) */ + if (key_len > 64) { + + MD5_CTX tctx; + + MD5_Init(&tctx); + MD5_Update(&tctx, key, key_len); + MD5_Final(tk, &tctx); + + key = tk; + key_len = 16; + } + + /* + * the HMAC_MD5 transform looks like: + * + * MD5(K XOR opad, MD5(K XOR ipad, text)) + * + * where K is an n byte key + * ipad is the byte 0x36 repeated 64 times + * + * opad is the byte 0x5c repeated 64 times + * and text is the data being protected + */ + + /* start out by storing key in pads */ + bzero( k_ipad, sizeof k_ipad); + bzero( k_opad, sizeof k_opad); + bcopy( key, k_ipad, key_len); + bcopy( key, k_opad, key_len); + + /* XOR key with ipad and opad values */ + for (i=0; i<64; i++) { + k_ipad[i] ^= 0x36; + k_opad[i] ^= 0x5c; + } + /* + * perform inner MD5 + */ + MD5_Init(&context); /* init context for 1st + * pass */ + MD5_Update(&context, k_ipad, 64); /* start with inner pad */ + MD5_Update(&context, text, text_len); /* then text of datagram */ + MD5_Final(digest, &context); /* finish up 1st pass */ + /* + * perform outer MD5 + */ + MD5_Init(&context); /* init context for 2nd + * pass */ + MD5_Update(&context, k_opad, 64); /* start with outer pad */ + MD5_Update(&context, digest, 16); /* then results of 1st + * hash */ + MD5_Final(digest, &context); /* finish up 2nd pass */ +} + +/* + * CRAM-MD5 authentication + */ +int +smtp_auth_md5(int fd, char *login, char *password) +{ + unsigned char digest[BUF_SIZE]; + char buffer[BUF_SIZE], ascii_digest[33]; + char *temp; + int len, i; + static char hextab[] = "0123456789abcdef"; + + temp = calloc(BUF_SIZE, 1); + memset(buffer, 0, sizeof(buffer)); + memset(digest, 0, sizeof(digest)); + memset(ascii_digest, 0, sizeof(ascii_digest)); + + /* Send AUTH command according to RFC 2554 */ + send_remote_command(fd, "AUTH CRAM-MD5"); + if (read_remote(fd, sizeof(buffer), buffer) != 3) { + syslog(LOG_DEBUG, "smarthost authentication:" + " AUTH cram-md5 not available: %s", neterr); + /* if cram-md5 is not available */ + free(temp); + return (-1); + } + + /* skip 3 char status + 1 char space */ + base64_decode(buffer + 4, temp); + hmac_md5((unsigned char *)temp, strlen(temp), + (unsigned char *)password, strlen(password), digest); + free(temp); + + ascii_digest[32] = 0; + for (i = 0; i < 16; i++) { + ascii_digest[2*i] = hextab[digest[i] >> 4]; + ascii_digest[2*i+1] = hextab[digest[i] & 15]; + } + + /* prepare answer */ + snprintf(buffer, BUF_SIZE, "%s %s", login, ascii_digest); + + /* encode answer */ + len = base64_encode(buffer, strlen(buffer), &temp); + if (len < 0) { + syslog(LOG_ERR, "can not encode auth reply: %m"); + return (-1); + } + + /* send answer */ + send_remote_command(fd, "%s", temp); + free(temp); + if (read_remote(fd, 0, NULL) != 2) { + syslog(LOG_WARNING, "remote delivery deferred:" + " AUTH cram-md5 failed: %s", neterr); + return (-2); + } + + return (0); +} |