[dragonfly.git] / libexec / dma / crypto.c

/*
 * 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.
 *
 * $DragonFly: src/libexec/dma/crypto.c,v 1.4 2008/09/30 17:47:21 swildner Exp $
 */

#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;
	SSL_METHOD *meth = NULL;
	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) {
				syslog(LOG_ERR, "remote delivery deferred:"
				  " STARTTLS not available: %s", neterr);
				config->features &= ~NOSSL;
				return (1);
			}
		}
		/* 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,
    caddr_t 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 buffer[BUF_SIZE], digest[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 authentification:"
		       " AUTH cram-md5 not available: %s", neterr);
		/* if cram-md5 is not available */
		return (-1);
	}

	/* skip 3 char status + 1 char space */
	base64_decode(buffer + 4, temp);
	hmac_md5(temp, strlen(temp), 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);
}
Commit	Line	Data
f67beddd MS	1	/*
	2	* Copyright (c) 2008 The DragonFly Project. All rights reserved.
	3	*
	4	* This code is derived from software contributed to The DragonFly Project
	5	* by Matthias Schmidt <matthias@dragonflybsd.org>, University of Marburg,
	6	* Germany.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	*
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in
	16	* the documentation and/or other materials provided with the
	17	* distribution.
	18	* 3. Neither the name of The DragonFly Project nor the names of its
	19	* contributors may be used to endorse or promote products derived
	20	* from this software without specific, prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	23	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	24	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	25	* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	26	* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	27	* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
	28	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	29	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
	30	* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	31	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	32	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	33	* SUCH DAMAGE.
	34	*
bc7baf1d	35	* $DragonFly: src/libexec/dma/crypto.c,v 1.4 2008/09/30 17:47:21 swildner Exp $
f67beddd MS	36	*/
f67beddd MS	37
f67beddd	38	#include <openssl/x509.h>
7b68d8ae	39	#include <openssl/md5.h>
f67beddd MS	40	#include <openssl/ssl.h>
	41	#include <openssl/err.h>
	42	#include <openssl/pem.h>
	43	#include <openssl/rand.h>
	44
	45	#include <syslog.h>
	46
	47	#include "dma.h"
	48
f67beddd	49	static int
405f48ee	50	init_cert_file(SSL_CTX ctx, const char path)
f67beddd MS	51	{
	52	int error;
	53
	54	/* Load certificate into ctx */
	55	error = SSL_CTX_use_certificate_chain_file(ctx, path);
	56	if (error < 1) {
405f48ee	57	syslog(LOG_ERR, "SSL: Cannot load certificate `%s': %s", path, ssl_errstr());
f67beddd MS	58	return (-1);
	59	}
	60
	61	/* Add private key to ctx */
	62	error = SSL_CTX_use_PrivateKey_file(ctx, path, SSL_FILETYPE_PEM);
	63	if (error < 1) {
405f48ee	64	syslog(LOG_ERR, "SSL: Cannot load private key `%s': %s", path, ssl_errstr());
f67beddd MS	65	return (-1);
	66	}
	67
	68	/*
	69	* Check the consistency of a private key with the corresponding
	70	* certificate
	71	*/
	72	error = SSL_CTX_check_private_key(ctx);
	73	if (error < 1) {
405f48ee	74	syslog(LOG_ERR, "SSL: Cannot check private key: %s", ssl_errstr());
f67beddd MS	75	return (-1);
	76	}
	77
	78	return (0);
	79	}
	80
	81	int
405f48ee	82	smtp_init_crypto(int fd, int feature)
f67beddd MS	83	{
	84	SSL_CTX *ctx = NULL;
	85	SSL_METHOD *meth = NULL;
	86	X509 *cert;
f67beddd MS	87	int error;
f67beddd MS	88
ea921663	89	/* XXX clean up on error/close */
f67beddd MS	90	/* Init SSL library */
f67beddd MS	91	SSL_library_init();
e2c88018	92	SSL_load_error_strings();
f67beddd MS	93
	94	meth = TLSv1_client_method();
	95
	96	ctx = SSL_CTX_new(meth);
	97	if (ctx == NULL) {
405f48ee	98	syslog(LOG_WARNING, "remote delivery deferred: SSL init failed: %s", ssl_errstr());
e2c88018	99	return (1);
f67beddd MS	100	}
	101
	102	/* User supplied a certificate */
e2c88018	103	if (config->certfile != NULL) {
405f48ee	104	error = init_cert_file(ctx, config->certfile);
e2c88018	105	if (error) {
405f48ee	106	syslog(LOG_WARNING, "remote delivery deferred");
e2c88018 SS	107	return (1);
	108	}
	109	}
f67beddd MS	110
	111	/*
	112	* If the user wants STARTTLS, we have to send EHLO here
	113	*/
	114	if (((feature & SECURETRANS) != 0) &&
	115	(feature & STARTTLS) != 0) {
	116	/* TLS init phase, disable SSL_write */
6ef9fe01	117	config->features \|= NOSSL;
f67beddd MS	118
f67beddd MS	119	send_remote_command(fd, "EHLO %s", hostname());
7b68d8ae	120	if (read_remote(fd, 0, NULL) == 2) {
f67beddd	121	send_remote_command(fd, "STARTTLS");
7b68d8ae	122	if (read_remote(fd, 0, NULL) != 2) {
405f48ee SS	123	syslog(LOG_ERR, "remote delivery deferred:"
405f48ee SS	124	" STARTTLS not available: %s", neterr);
6ef9fe01	125	config->features &= ~NOSSL;
e2c88018	126	return (1);
f67beddd MS	127	}
	128	}
	129	/* End of TLS init phase, enable SSL_write/read */
6ef9fe01	130	config->features &= ~NOSSL;
f67beddd MS	131	}
	132
	133	config->ssl = SSL_new(ctx);
	134	if (config->ssl == NULL) {
405f48ee SS	135	syslog(LOG_NOTICE, "remote delivery deferred: SSL struct creation failed: %s",
405f48ee SS	136	ssl_errstr());
e2c88018	137	return (1);
f67beddd MS	138	}
	139
	140	/* Set ssl to work in client mode */
	141	SSL_set_connect_state(config->ssl);
	142
	143	/* Set fd for SSL in/output */
	144	error = SSL_set_fd(config->ssl, fd);
	145	if (error == 0) {
405f48ee SS	146	syslog(LOG_NOTICE, "remote delivery deferred: SSL set fd failed: %s",
405f48ee SS	147	ssl_errstr());
e2c88018	148	return (1);
f67beddd MS	149	}
	150
	151	/* Open SSL connection */
	152	error = SSL_connect(config->ssl);
	153	if (error < 0) {
405f48ee SS	154	syslog(LOG_ERR, "remote delivery deferred: SSL handshake failed fatally: %s",
405f48ee SS	155	ssl_errstr());
e2c88018	156	return (1);
f67beddd MS	157	}
	158
	159	/* Get peer certificate */
	160	cert = SSL_get_peer_certificate(config->ssl);
	161	if (cert == NULL) {
405f48ee SS	162	syslog(LOG_WARNING, "remote delivery deferred: Peer did not provide certificate: %s",
405f48ee SS	163	ssl_errstr());
f67beddd MS	164	}
	165	X509_free(cert);
	166
	167	return (0);
	168	}
	169
7b68d8ae MS	170	/*
	171	* hmac_md5() taken out of RFC 2104. This RFC was written by H. Krawczyk,
	172	* M. Bellare and R. Canetti.
bc7baf1d SW	173	*
	174	* text pointer to data stream
	175	* text_len length of data stream
	176	* key pointer to authentication key
	177	* key_len length of authentication key
	178	* digest caller digest to be filled int
	179	*/
7b68d8ae	180	void
bc7baf1d SW	181	hmac_md5(unsigned char text, int text_len, unsigned char key, int key_len,
bc7baf1d SW	182	caddr_t digest)
7b68d8ae MS	183	{
	184	MD5_CTX context;
	185	unsigned char k_ipad[65]; /* inner padding -
	186	* key XORd with ipad
	187	*/
	188	unsigned char k_opad[65]; /* outer padding -
	189	* key XORd with opad
	190	*/
	191	unsigned char tk[16];
	192	int i;
	193	/* if key is longer than 64 bytes reset it to key=MD5(key) */
	194	if (key_len > 64) {
	195
	196	MD5_CTX tctx;
	197
	198	MD5_Init(&tctx);
	199	MD5_Update(&tctx, key, key_len);
	200	MD5_Final(tk, &tctx);
	201
	202	key = tk;
	203	key_len = 16;
	204	}
	205
	206	/*
	207	* the HMAC_MD5 transform looks like:
	208	*
	209	* MD5(K XOR opad, MD5(K XOR ipad, text))
	210	*
	211	* where K is an n byte key
	212	* ipad is the byte 0x36 repeated 64 times
	213	*
	214	* opad is the byte 0x5c repeated 64 times
	215	* and text is the data being protected
	216	*/
	217
	218	/* start out by storing key in pads */
	219	bzero( k_ipad, sizeof k_ipad);
	220	bzero( k_opad, sizeof k_opad);
	221	bcopy( key, k_ipad, key_len);
	222	bcopy( key, k_opad, key_len);
	223
	224	/* XOR key with ipad and opad values */
	225	for (i=0; i<64; i++) {
	226	k_ipad[i] ^= 0x36;
	227	k_opad[i] ^= 0x5c;
	228	}
	229	/*
	230	* perform inner MD5
	231	*/
	232	MD5_Init(&context); /* init context for 1st
	233	* pass */
	234	MD5_Update(&context, k_ipad, 64); /* start with inner pad */
	235	MD5_Update(&context, text, text_len); /* then text of datagram */
	236	MD5_Final(digest, &context); /* finish up 1st pass */
	237	/*
	238	* perform outer MD5
	239	*/
	240	MD5_Init(&context); /* init context for 2nd
	241	* pass */
	242	MD5_Update(&context, k_opad, 64); /* start with outer pad */
	243	MD5_Update(&context, digest, 16); /* then results of 1st
	244	* hash */
	245	MD5_Final(digest, &context); /* finish up 2nd pass */
	246	}
247
f67beddd MS	248	/*
f67beddd MS	249	* CRAM-MD5 authentication
f67beddd MS	250	*/
f67beddd MS	251	int
405f48ee	252	smtp_auth_md5(int fd, char login, char password)
f67beddd	253	{
7b68d8ae MS	254	unsigned char buffer[BUF_SIZE], digest[BUF_SIZE], ascii_digest[33];
	255	char *temp;
	256	int len, i;
	257	static char hextab[] = "0123456789abcdef";
	258
	259	temp = calloc(BUF_SIZE, 1);
	260	memset(buffer, 0, sizeof(buffer));
	261	memset(digest, 0, sizeof(digest));
	262	memset(ascii_digest, 0, sizeof(ascii_digest));
	263
	264	/* Send AUTH command according to RFC 2554 */
	265	send_remote_command(fd, "AUTH CRAM-MD5");
	266	if (read_remote(fd, sizeof(buffer), buffer) != 3) {
405f48ee SS	267	syslog(LOG_DEBUG, "smarthost authentification:"
405f48ee SS	268	" AUTH cram-md5 not available: %s", neterr);
7b68d8ae MS	269	/* if cram-md5 is not available */
	270	return (-1);
	271	}
	272
	273	/* skip 3 char status + 1 char space */
	274	base64_decode(buffer + 4, temp);
	275	hmac_md5(temp, strlen(temp), password, strlen(password), digest);
5d7fe8bb	276	free(temp);
7b68d8ae MS	277
	278	ascii_digest[32] = 0;
	279	for (i = 0; i < 16; i++) {
	280	ascii_digest[2*i] = hextab[digest[i] >> 4];
	281	ascii_digest[2*i+1] = hextab[digest[i] & 15];
	282	}
	283
	284	/* prepare answer */
	285	snprintf(buffer, BUF_SIZE, "%s %s", login, ascii_digest);
	286
7b68d8ae MS	287	/* encode answer */
7b68d8ae MS	288	len = base64_encode(buffer, strlen(buffer), &temp);
5d7fe8bb	289	if (len < 0) {
405f48ee	290	syslog(LOG_ERR, "can not encode auth reply: %m");
7b68d8ae	291	return (-1);
5d7fe8bb	292	}
7b68d8ae MS	293
	294	/* send answer */
	295	send_remote_command(fd, "%s", temp);
5d7fe8bb	296	free(temp);
7b68d8ae	297	if (read_remote(fd, 0, NULL) != 2) {
405f48ee SS	298	syslog(LOG_WARNING, "remote delivery deferred:"
405f48ee SS	299	" AUTH cram-md5 failed: %s", neterr);
7b68d8ae MS	300	return (-2);
	301	}
	302
	303	return (0);
f67beddd	304	}