* 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 1.1 2008/02/02 18:20:51 matthias Exp $
*/
-#ifdef HAVE_CRYPTO
-
#include <openssl/x509.h>
+#include <openssl/md5.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include "dma.h"
-extern struct config *config;
-
static int
-init_cert_file(struct qitem *it, SSL_CTX *ctx, const char *path)
+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, "%s: SSL: Cannot load certificate: %s",
- it->queueid, path);
+ 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, "%s: SSL: Cannot load private key: %s",
- it->queueid, path);
+ syslog(LOG_ERR, "SSL: Cannot load private key `%s': %s", path, ssl_errstr());
return (-1);
}
*/
error = SSL_CTX_check_private_key(ctx);
if (error < 1) {
- syslog(LOG_ERR, "%s: SSL: Cannot check private key: %s",
- it->queueid, path);
+ syslog(LOG_ERR, "SSL: Cannot check private key: %s", ssl_errstr());
return (-1);
}
}
int
-smtp_init_crypto(struct qitem *it, int fd, int feature)
+smtp_init_crypto(int fd, int feature, struct smtp_features* features)
{
SSL_CTX *ctx = NULL;
+#if (OPENSSL_VERSION_NUMBER >= 0x00909000L)
+ const SSL_METHOD *meth = NULL;
+#else
SSL_METHOD *meth = NULL;
+#endif
X509 *cert;
- char buf[2048];
int error;
+ /* XXX clean up on error/close */
/* Init SSL library */
SSL_library_init();
+ SSL_load_error_strings();
- meth = TLSv1_client_method();
+ // Allow any possible version
+#if (OPENSSL_VERSION_NUMBER >= 0x10100000L)
+ meth = TLS_client_method();
+#else
+ meth = SSLv23_client_method();
+#endif
ctx = SSL_CTX_new(meth);
if (ctx == NULL) {
- syslog(LOG_ERR, "%s: remote delivery deferred:"
- " SSL init failed: %m", it->queueid);
- return (2);
+ syslog(LOG_WARNING, "remote delivery deferred: SSL init failed: %s", ssl_errstr());
+ return (1);
}
/* User supplied a certificate */
- if (config->certfile != NULL)
- init_cert_file(it, ctx, config->certfile);
+ 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 |= TLSINIT;
+ config.features |= NOSSL;
- send_remote_command(fd, "EHLO %s", hostname());
- if (check_for_smtp_error(fd, buf) == 0) {
+ if (perform_server_greeting(fd, features) == 0) {
send_remote_command(fd, "STARTTLS");
- if (check_for_smtp_error(fd, buf) < 0) {
- syslog(LOG_ERR, "%s: remote delivery failed:"
- " STARTTLS not available: %m", it->queueid);
- config->features &= ~TLSINIT;
- return (-1);
+ 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 &= ~TLSINIT;
+ config.features &= ~NOSSL;
}
- config->ssl = SSL_new(ctx);
- if (config->ssl == NULL) {
- syslog(LOG_ERR, "%s: remote delivery deferred:"
- " SSL struct creation failed:", it->queueid);
- return (2);
+ 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);
+ SSL_set_connect_state(config.ssl);
/* Set fd for SSL in/output */
- error = SSL_set_fd(config->ssl, fd);
+ error = SSL_set_fd(config.ssl, fd);
if (error == 0) {
- error = SSL_get_error(config->ssl, error);
- syslog(LOG_ERR, "%s: remote delivery deferred:"
- " SSL set fd failed (%d): %m", it->queueid, error);
- return (2);
+ syslog(LOG_NOTICE, "remote delivery deferred: SSL set fd failed: %s",
+ ssl_errstr());
+ return (1);
}
/* Open SSL connection */
- error = SSL_connect(config->ssl);
+ error = SSL_connect(config.ssl);
if (error < 0) {
- syslog(LOG_ERR, "%s: remote delivery failed:"
- " SSL handshake fataly failed: %m", it->queueid);
- return (-1);
+ 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);
+ cert = SSL_get_peer_certificate(config.ssl);
if (cert == NULL) {
- syslog(LOG_ERR, "%s: remote delivery deferred:"
- " Peer did not provied certificate: %m", it->queueid);
+ syslog(LOG_WARNING, "remote delivery deferred: Peer did not provide certificate: %s",
+ ssl_errstr());
}
X509_free(cert);
return (0);
}
-#if 0
/*
- * CRAM-MD5 authentication
+ * hmac_md5() taken out of RFC 2104. This RFC was written by H. Krawczyk,
+ * M. Bellare and R. Canetti.
*
- * XXX TODO implement me, I don't have a mail server with CRAM-MD5 available
+ * 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)
{
-}
-#endif /* 0 */
+ 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);
+ }
-#endif /* HAVE_CRYPTO */
+ /* 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);
+}
projects / people / ms / dma.git / blobdiff