Date: Wed, 8 Dec 2010 15:52:06 +0000 (UTC) From: Shteryana Shopova <syrinx@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r216299 - head/contrib/bsnmp/lib Message-ID: <201012081552.oB8Fq6Cc007902@svn.freebsd.org>
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Author: syrinx Date: Wed Dec 8 15:52:06 2010 New Revision: 216299 URL: http://svn.freebsd.org/changeset/base/216299 Log: Add a forgotten file from r216294 and unbreak the build. Sponsored by: The FreeBSD Foundation Reviewed by: philip@ (mostly) Approved by: philip@ Added: head/contrib/bsnmp/lib/snmpcrypto.c (contents, props changed) Added: head/contrib/bsnmp/lib/snmpcrypto.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/contrib/bsnmp/lib/snmpcrypto.c Wed Dec 8 15:52:06 2010 (r216299) @@ -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 */
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