3311ff84ea
ntp 4.2.8p5 Reviewed by: cy, roberto Relnotes: yes Differential Revision: https://reviews.freebsd.org/D4828
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
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* digest support for NTP, MD5 and with OpenSSL more
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "ntp_fp.h"
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#include "ntp_string.h"
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#include "ntp_stdlib.h"
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#include "ntp.h"
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#include "ntp_md5.h" /* provides OpenSSL digest API */
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/*
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* MD5authencrypt - generate message digest
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*
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* Returns length of MAC including key ID and digest.
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*/
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size_t
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MD5authencrypt(
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int type, /* hash algorithm */
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const u_char * key, /* key pointer */
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u_int32 * pkt, /* packet pointer */
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size_t length /* packet length */
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)
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{
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u_char digest[EVP_MAX_MD_SIZE];
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u_int len;
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EVP_MD_CTX ctx;
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/*
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* Compute digest of key concatenated with packet. Note: the
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* key type and digest type have been verified when the key
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* was creaded.
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*/
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INIT_SSL();
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#if defined(OPENSSL) && OPENSSL_VERSION_NUMBER >= 0x0090700fL
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if (!EVP_DigestInit(&ctx, EVP_get_digestbynid(type))) {
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msyslog(LOG_ERR,
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"MAC encrypt: digest init failed");
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return (0);
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}
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#else
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EVP_DigestInit(&ctx, EVP_get_digestbynid(type));
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#endif
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EVP_DigestUpdate(&ctx, key, cache_secretsize);
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EVP_DigestUpdate(&ctx, (u_char *)pkt, length);
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EVP_DigestFinal(&ctx, digest, &len);
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memmove((u_char *)pkt + length + 4, digest, len);
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return (len + 4);
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}
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/*
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* MD5authdecrypt - verify MD5 message authenticator
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*
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* Returns one if digest valid, zero if invalid.
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*/
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int
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MD5authdecrypt(
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int type, /* hash algorithm */
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const u_char * key, /* key pointer */
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u_int32 * pkt, /* packet pointer */
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size_t length, /* packet length */
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size_t size /* MAC size */
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)
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{
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u_char digest[EVP_MAX_MD_SIZE];
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u_int len;
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EVP_MD_CTX ctx;
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/*
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* Compute digest of key concatenated with packet. Note: the
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* key type and digest type have been verified when the key
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* was created.
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*/
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INIT_SSL();
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#if defined(OPENSSL) && OPENSSL_VERSION_NUMBER >= 0x0090700fL
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if (!EVP_DigestInit(&ctx, EVP_get_digestbynid(type))) {
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msyslog(LOG_ERR,
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"MAC decrypt: digest init failed");
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return (0);
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}
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#else
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EVP_DigestInit(&ctx, EVP_get_digestbynid(type));
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#endif
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EVP_DigestUpdate(&ctx, key, cache_secretsize);
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EVP_DigestUpdate(&ctx, (u_char *)pkt, length);
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EVP_DigestFinal(&ctx, digest, &len);
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if (size != (size_t)len + 4) {
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msyslog(LOG_ERR,
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"MAC decrypt: MAC length error");
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return (0);
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}
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return !memcmp(digest, (const char *)pkt + length + 4, len);
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}
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/*
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* Calculate the reference id from the address. If it is an IPv4
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* address, use it as is. If it is an IPv6 address, do a md5 on
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* it and use the bottom 4 bytes.
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* The result is in network byte order.
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*/
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u_int32
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addr2refid(sockaddr_u *addr)
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{
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u_char digest[20];
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u_int32 addr_refid;
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EVP_MD_CTX ctx;
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u_int len;
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if (IS_IPV4(addr))
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return (NSRCADR(addr));
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INIT_SSL();
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#if defined(OPENSSL) && OPENSSL_VERSION_NUMBER >= 0x0090700fL
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EVP_MD_CTX_init(&ctx);
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#ifdef EVP_MD_CTX_FLAG_NON_FIPS_ALLOW
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/* MD5 is not used as a crypto hash here. */
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EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
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#endif
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if (!EVP_DigestInit_ex(&ctx, EVP_md5(), NULL)) {
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msyslog(LOG_ERR,
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"MD5 init failed");
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exit(1);
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}
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#else
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EVP_DigestInit(&ctx, EVP_md5());
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#endif
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EVP_DigestUpdate(&ctx, (u_char *)PSOCK_ADDR6(addr),
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sizeof(struct in6_addr));
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EVP_DigestFinal(&ctx, digest, &len);
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memcpy(&addr_refid, digest, sizeof(addr_refid));
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return (addr_refid);
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}
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