Add a forgotten file from r216294 and unbreak the build.

Sponsored by:	The FreeBSD Foundation
Reviewed by:	philip@ (mostly)
Approved by:	philip@

1 files changed, 404 insertions, 0 deletions

diff --git a/contrib/bsnmp/lib/snmpcrypto.c b/contrib/bsnmp/lib/snmpcrypto.c
new file mode 100644
index 0000000..81d8eac
--- /dev/null
+++ b/contrib/bsnmp/lib/snmpcrypto.c
@@ -0,0 +1,404 @@
+/*-
+ * Copyright (c) 2010 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Shteryana Sotirova Shopova under
+ * sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+#include <inttypes.h>
+#endif
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <netinet/in.h>
+
+#ifdef HAVE_LIBCRYPTO
+#include <openssl/evp.h>
+#endif
+
+#include "asn1.h"
+#include "snmp.h"
+#include "snmppriv.h"
+
+#define	SNMP_PRIV_AES_IV_SIZ		16
+#define	SNMP_EXTENDED_KEY_SIZ		64
+#define	SNMP_AUTH_KEY_LOOPCNT		1048576
+#define	SNMP_AUTH_BUF_SIZE		72
+
+static const uint8_t ipad = 0x36;
+static const uint8_t opad = 0x5c;
+
+#ifdef HAVE_LIBCRYPTO
+
+static int32_t
+snmp_digest_init(const struct snmp_user *user, EVP_MD_CTX *ctx,
+    const EVP_MD **dtype, uint32_t *keylen)
+{
+	if (user->auth_proto == SNMP_AUTH_HMAC_MD5) {
+		*dtype = EVP_md5();
+		*keylen = SNMP_AUTH_HMACMD5_KEY_SIZ;
+	} else if (user->auth_proto == SNMP_AUTH_HMAC_SHA) {
+		*dtype = EVP_sha1();
+		*keylen = SNMP_AUTH_HMACSHA_KEY_SIZ;
+	} else if (user->auth_proto == SNMP_AUTH_NOAUTH)
+		return (0);
+	else {
+		snmp_error("unknown authentication option - %d",
+		    user->auth_proto);
+		return (-1);
+	}
+
+	if (EVP_DigestInit(ctx, *dtype) != 1)
+		return (-1);
+
+	return (1);
+}
+
+enum snmp_code
+snmp_pdu_calc_digest(struct asn_buf *b, const struct snmp_pdu *pdu,
+    uint8_t *digest)
+{
+	uint8_t md[EVP_MAX_MD_SIZE], extkey[SNMP_EXTENDED_KEY_SIZ];
+	uint8_t key1[SNMP_EXTENDED_KEY_SIZ], key2[SNMP_EXTENDED_KEY_SIZ];
+	uint32_t i, keylen, olen;
+	int32_t err;
+	const EVP_MD *dtype;
+	EVP_MD_CTX ctx;
+
+	err = snmp_digest_init(&pdu->user, &ctx, &dtype, &keylen);
+	if (err < 0)
+		return (SNMP_CODE_BADDIGEST);
+	else if (err == 0)
+		return (SNMP_CODE_OK);
+
+	memset(pdu->digest_ptr, 0, sizeof(pdu->msg_digest));
+	memcpy(extkey, pdu->user.auth_key, keylen);
+	memset(extkey + keylen, 0, sizeof(extkey) - keylen);
+
+	for (i = 0; i < SNMP_EXTENDED_KEY_SIZ; i++) {
+		key1[i] = extkey[i] ^ ipad;
+		key2[i] = extkey[i] ^ opad;
+	}
+
+	if (EVP_DigestUpdate(&ctx, key1, SNMP_EXTENDED_KEY_SIZ) != 1 ||
+	    EVP_DigestUpdate(&ctx, pdu->outer_ptr, pdu->outer_len) != 1 ||
+	    EVP_DigestFinal(&ctx, md, &olen) != 1)
+		goto failed;
+
+	if (EVP_DigestInit(&ctx, dtype) != 1 ||
+	    EVP_DigestUpdate(&ctx, key2, SNMP_EXTENDED_KEY_SIZ) != 1 ||
+	    EVP_DigestUpdate(&ctx, md, olen) != 1 ||
+	    EVP_DigestFinal(&ctx, md, &olen) != 1)
+		goto failed;
+
+	if (olen < SNMP_USM_AUTH_SIZE) {
+		snmp_error("bad digest size - %d", olen);
+		EVP_MD_CTX_cleanup(&ctx);
+		return (SNMP_CODE_BADDIGEST);
+	}
+
+	memcpy(digest, md, SNMP_USM_AUTH_SIZE);
+	EVP_MD_CTX_cleanup(&ctx);
+	return (SNMP_CODE_OK);
+
+failed:
+	EVP_MD_CTX_cleanup(&ctx);
+	return (SNMP_CODE_BADDIGEST);
+}
+
+static int32_t
+snmp_pdu_cipher_init(const struct snmp_pdu *pdu, int32_t len,
+    EVP_CIPHER_CTX *ctx, const EVP_CIPHER **ctype, uint8_t *piv)
+{
+	int i;
+	uint32_t netint;
+
+	if (pdu->user.priv_proto == SNMP_PRIV_DES) {
+		if (len  % 8 != 0)
+			return (-1);
+		*ctype = EVP_des_cbc();
+		memcpy(piv, pdu->msg_salt, sizeof(pdu->msg_salt));
+		for (i = 0; i < 8; i++)
+			piv[i] = piv[i] ^ pdu->user.priv_key[8 + i];
+	} else if (pdu->user.priv_proto == SNMP_PRIV_AES) {
+		*ctype = EVP_aes_128_cfb128();
+		netint = htonl(pdu->engine.engine_boots);
+		memcpy(piv, &netint, sizeof(netint));
+		piv += sizeof(netint);
+		netint = htonl(pdu->engine.engine_time);
+		memcpy(piv, &netint, sizeof(netint));
+		piv += sizeof(netint);
+		memcpy(piv, pdu->msg_salt, sizeof(pdu->msg_salt));
+	} else if (pdu->user.priv_proto == SNMP_PRIV_NOPRIV)
+		return (0);
+	else {
+		snmp_error("unknown privacy option - %d", pdu->user.priv_proto);
+		return (-1);
+	}
+
+	return (1);
+}
+
+enum snmp_code
+snmp_pdu_encrypt(struct asn_buf *b, const struct snmp_pdu *pdu)
+{
+	int32_t err, olen;
+	uint8_t iv[SNMP_PRIV_AES_IV_SIZ];
+	const EVP_CIPHER *ctype;
+	EVP_CIPHER_CTX ctx;
+
+	err = snmp_pdu_cipher_init(pdu, pdu->scoped_len, &ctx, &ctype, iv);
+	if (err < 0)
+		return (SNMP_CODE_EDECRYPT);
+	else if (err == 0)
+		return (SNMP_CODE_OK);
+
+	if (EVP_EncryptInit(&ctx, ctype, pdu->user.priv_key, iv) != 1)
+		return (SNMP_CODE_FAILED);
+
+	if (EVP_EncryptUpdate(&ctx, pdu->scoped_ptr, &olen, pdu->scoped_ptr,
+	    pdu->scoped_len) != 1 ||
+	    EVP_EncryptFinal(&ctx, pdu->scoped_ptr + olen, &olen) != 1) {
+		EVP_CIPHER_CTX_cleanup(&ctx);
+		return (SNMP_CODE_FAILED);
+	}
+
+	EVP_CIPHER_CTX_cleanup(&ctx);
+	return (SNMP_CODE_OK);
+}
+
+enum snmp_code
+snmp_pdu_decrypt(struct asn_buf *b, const struct snmp_pdu *pdu)
+{
+	int32_t err, olen;
+	uint8_t iv[SNMP_PRIV_AES_IV_SIZ];
+	const EVP_CIPHER *ctype;
+	EVP_CIPHER_CTX ctx;
+
+	err = snmp_pdu_cipher_init(pdu, pdu->scoped_len, &ctx, &ctype, iv);
+	if (err < 0)
+		return (SNMP_CODE_EDECRYPT);
+	else if (err == 0)
+		return (SNMP_CODE_OK);
+
+	if (EVP_DecryptInit(&ctx, ctype, pdu->user.priv_key, iv) != 1 ||
+	    EVP_CIPHER_CTX_set_padding(&ctx, 0) != 1)
+		return (SNMP_CODE_EDECRYPT);
+
+	if (EVP_DecryptUpdate(&ctx, pdu->scoped_ptr, &olen, pdu->scoped_ptr,
+	    pdu->scoped_len) != 1 ||
+	    EVP_DecryptFinal(&ctx, pdu->scoped_ptr + olen, &olen) != 1) {
+		EVP_CIPHER_CTX_cleanup(&ctx);
+		return (SNMP_CODE_EDECRYPT);
+	}
+
+	EVP_CIPHER_CTX_cleanup(&ctx);
+	return (SNMP_CODE_OK);
+}
+
+/* [RFC 3414] - A.2. Password to Key Algorithm */
+enum snmp_code
+snmp_passwd_to_keys(struct snmp_user *user, char *passwd)
+{
+	int err, loop, i, pwdlen;
+	uint32_t  keylen, olen;
+	const EVP_MD *dtype;
+	EVP_MD_CTX ctx;
+	uint8_t authbuf[SNMP_AUTH_BUF_SIZE];
+
+	if (passwd == NULL || user == NULL)
+		return (SNMP_CODE_FAILED);
+
+	err = snmp_digest_init(user, &ctx, &dtype, &keylen);
+	if (err < 0)
+		return (SNMP_CODE_BADDIGEST);
+	else if (err == 0)
+		return (SNMP_CODE_OK);
+
+	memset(user->auth_key, 0, sizeof(user->auth_key));
+	pwdlen = strlen(passwd);
+
+	for (loop = 0; loop < SNMP_AUTH_KEY_LOOPCNT; loop += i) {
+		for (i = 0; i < SNMP_EXTENDED_KEY_SIZ; i++)
+			authbuf[i] = passwd[(loop + i) % pwdlen];
+		if (EVP_DigestUpdate(&ctx, authbuf, SNMP_EXTENDED_KEY_SIZ) != 1)
+			goto failed;
+	}
+
+	if (EVP_DigestFinal(&ctx, user->auth_key, &olen) != 1)
+		goto failed;
+
+	EVP_MD_CTX_cleanup(&ctx);
+	return (SNMP_CODE_OK);
+
+failed:
+	EVP_MD_CTX_cleanup(&ctx);
+	return (SNMP_CODE_BADDIGEST);
+}
+
+/* [RFC 3414] - 2.6. Key Localization Algorithm */
+enum snmp_code
+snmp_get_local_keys(struct snmp_user *user, uint8_t *eid, uint32_t elen)
+{
+	int err;
+	uint32_t  keylen, olen;
+	const EVP_MD *dtype;
+	EVP_MD_CTX ctx;
+	uint8_t authbuf[SNMP_AUTH_BUF_SIZE];
+
+	if (user == NULL || eid == NULL || elen > SNMP_ENGINE_ID_SIZ)
+		return (SNMP_CODE_FAILED);
+
+	memset(user->priv_key, 0, sizeof(user->priv_key));
+	memset(authbuf, 0, sizeof(authbuf));
+
+	err = snmp_digest_init(user, &ctx, &dtype, &keylen);
+	if (err < 0)
+		return (SNMP_CODE_BADDIGEST);
+	else if (err == 0)
+		return (SNMP_CODE_OK);
+
+	memcpy(authbuf, user->auth_key, keylen);
+	memcpy(authbuf + keylen, eid, elen);
+	memcpy(authbuf + keylen + elen, user->auth_key, keylen);
+
+	if (EVP_DigestUpdate(&ctx, authbuf, 2 * keylen + elen) != 1 ||
+	    EVP_DigestFinal(&ctx, user->auth_key, &olen) != 1) {
+		EVP_MD_CTX_cleanup(&ctx);
+		return (SNMP_CODE_BADDIGEST);
+	}
+	EVP_MD_CTX_cleanup(&ctx);
+
+	if (user->priv_proto != SNMP_PRIV_NOPRIV)
+		memcpy(user->priv_key, user->auth_key, sizeof(user->priv_key));
+
+	return (SNMP_CODE_OK);
+}
+
+enum snmp_code
+snmp_calc_keychange(struct snmp_user *user, uint8_t *keychange)
+{
+	int32_t i, err, rvalue[SNMP_AUTH_HMACSHA_KEY_SIZ / 4];
+	uint32_t  keylen, olen;
+	const EVP_MD *dtype;
+	EVP_MD_CTX ctx;
+
+	err = snmp_digest_init(user, &ctx, &dtype, &keylen);
+	if (err < 0)
+		return (SNMP_CODE_BADDIGEST);
+	else if (err == 0)
+		return (SNMP_CODE_OK);
+
+	for (i = 0; i < keylen / 4; i++)
+		rvalue[i] = random();
+	
+	memcpy(keychange, user->auth_key, keylen);
+	memcpy(keychange + keylen, rvalue, keylen);
+
+	if (EVP_DigestUpdate(&ctx, keychange, 2 * keylen) != 1 ||
+	    EVP_DigestFinal(&ctx, keychange, &olen) != 1) {
+		EVP_MD_CTX_cleanup(&ctx);
+		return (SNMP_CODE_BADDIGEST);
+	}
+
+	EVP_MD_CTX_cleanup(&ctx);
+	return (SNMP_CODE_OK);
+}
+
+#else /* !HAVE_LIBCRYPTO */
+
+enum snmp_code
+snmp_pdu_calc_digest(struct asn_buf *b __unused, const struct snmp_pdu *pdu,
+    uint8_t *digest __unused)
+{
+	if  (pdu->user.auth_proto != SNMP_AUTH_NOAUTH)
+		return (SNMP_CODE_BADSECLEVEL);
+
+
+	return (SNMP_CODE_OK);
+}
+
+enum snmp_code
+snmp_pdu_encrypt(struct asn_buf *b __unused, const struct snmp_pdu *pdu)
+{
+	if (pdu->user.priv_proto != SNMP_PRIV_NOPRIV)
+		return (SNMP_CODE_BADSECLEVEL);
+
+	return (SNMP_CODE_OK);
+}
+
+enum snmp_code
+snmp_pdu_decrypt(struct asn_buf *b __unused, const struct snmp_pdu *pdu)
+{
+	if (pdu->user.priv_proto != SNMP_PRIV_NOPRIV)
+		return (SNMP_CODE_BADSECLEVEL);
+
+	return (SNMP_CODE_OK);
+}
+
+int
+snmp_passwd_to_keys(struct snmp_user *user, char *passwd __unused)
+{
+	if (user->auth_proto == SNMP_AUTH_NOAUTH &&
+	    user->priv_proto == SNMP_PRIV_NOPRIV)
+		return (SNMP_CODE_OK);
+
+	errno = EPROTONOSUPPORT;
+
+	return (SNMP_CODE_FAILED);
+}
+
+int
+snmp_get_local_keys(struct snmp_user *user, uint8_t *eid __unused,
+    uint32_t elen __unused)
+{
+	if (user->auth_proto == SNMP_AUTH_NOAUTH &&
+	    user->priv_proto == SNMP_PRIV_NOPRIV)
+		return (SNMP_CODE_OK);
+
+	errno = EPROTONOSUPPORT;
+
+	return (SNMP_CODE_FAILED);
+}
+
+enum snmp_code
+snmp_calc_keychange(struct snmp_user *user __unused,
+    uint8_t *keychange __unused)
+{
+	errno = EPROTONOSUPPORT;
+	return (SNMP_CODE_FAILED);
+}
+
+#endif /* HAVE_LIBCRYPTO */