Import dma 89702b7f14 (2013-02-13) into vendorsvendor/dma/20140213

1 files changed, 312 insertions, 0 deletions

diff --git a/crypto.c b/crypto.c
new file mode 100644
index 000000000000..897b55bfdcfc
--- /dev/null
+++ b/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);
+}