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-rw-r--r--src/tsig.c326
1 files changed, 326 insertions, 0 deletions
diff --git a/src/tsig.c b/src/tsig.c
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+/*
+ * Copyright 2019-2021 OARC, Inc.
+ * Copyright 2017-2018 Akamai Technologies
+ * Copyright 2006-2016 Nominum, Inc.
+ * All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "config.h"
+
+#include "tsig.h"
+
+#include "log.h"
+#include "opt.h"
+#include "dns.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <openssl/evp.h>
+#include <time.h>
+
+#define TSIG_HMACMD5_NAME "hmac-md5.sig-alg.reg.int"
+#define TSIG_HMACSHA1_NAME "hmac-sha1"
+#define TSIG_HMACSHA224_NAME "hmac-sha224"
+#define TSIG_HMACSHA256_NAME "hmac-sha256"
+#define TSIG_HMACSHA384_NAME "hmac-sha384"
+#define TSIG_HMACSHA512_NAME "hmac-sha512"
+
+static unsigned char* decode64(const void* base64, int* len)
+{
+ unsigned char* out;
+
+ assert(base64);
+ assert(len);
+ assert(*len);
+
+ out = calloc(1, *len);
+ assert(out);
+
+ int olen = *len;
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+ EVP_ENCODE_CTX evp;
+ EVP_DecodeInit(&evp);
+ if (EVP_DecodeUpdate(&evp, out, &olen, base64, *len)) {
+ free(out);
+ return 0;
+ }
+#else
+ EVP_ENCODE_CTX* evp = EVP_ENCODE_CTX_new();
+ if (!evp) {
+ free(out);
+ return 0;
+ }
+ EVP_DecodeInit(evp);
+ if (EVP_DecodeUpdate(evp, out, &olen, base64, *len)) {
+ free(out);
+ EVP_ENCODE_CTX_free(evp);
+ return 0;
+ }
+ EVP_ENCODE_CTX_free(evp);
+#endif
+
+ *len = olen;
+
+ return out;
+}
+
+perf_tsigkey_t* perf_tsig_parsekey(const char* arg)
+{
+ perf_tsigkey_t* tsigkey;
+ const char * sep1, *sep2, *alg, *name, *secret;
+ size_t alglen, namelen, secretlen;
+ int keylen;
+ const EVP_MD* md = 0;
+
+ tsigkey = calloc(1, sizeof(*tsigkey));
+ if (!tsigkey) {
+ perf_log_fatal("out of memory");
+ return 0; // fix clang scan-build
+ }
+
+ sep1 = strchr(arg, ':');
+ if (sep1 == NULL) {
+ perf_log_warning("invalid TSIG [alg:]name:secret");
+ perf_opt_usage();
+ exit(1);
+ }
+
+ sep2 = strchr(sep1 + 1, ':');
+ if (sep2 == NULL) {
+ /* name:key */
+ alg = NULL;
+ alglen = 0;
+ name = arg;
+ namelen = sep1 - arg;
+ secret = sep1 + 1;
+ } else {
+ /* [alg:]name:secret */
+ alg = arg;
+ alglen = sep1 - arg;
+ name = sep1 + 1;
+ namelen = sep2 - sep1 - 1;
+ secret = sep2 + 1;
+ }
+
+ /* Algorithm */
+
+ if (!alg || !strncasecmp(alg, "hmac-md5:", 9)) {
+ md = EVP_md5();
+ tsigkey->alg = TSIG_HMACMD5_NAME;
+ tsigkey->alglen = sizeof(TSIG_HMACMD5_NAME) - 1;
+ } else if (!strncasecmp(alg, "hmac-sha1:", 10)) {
+ md = EVP_sha1();
+ tsigkey->alg = TSIG_HMACSHA1_NAME;
+ tsigkey->alglen = sizeof(TSIG_HMACSHA1_NAME) - 1;
+ } else if (!strncasecmp(alg, "hmac-sha224:", 12)) {
+ md = EVP_sha224();
+ tsigkey->alg = TSIG_HMACSHA224_NAME;
+ tsigkey->alglen = sizeof(TSIG_HMACSHA224_NAME) - 1;
+ } else if (!strncasecmp(alg, "hmac-sha256:", 12)) {
+ md = EVP_sha256();
+ tsigkey->alg = TSIG_HMACSHA256_NAME;
+ tsigkey->alglen = sizeof(TSIG_HMACSHA256_NAME) - 1;
+ } else if (!strncasecmp(alg, "hmac-sha384:", 12)) {
+ md = EVP_sha384();
+ tsigkey->alg = TSIG_HMACSHA384_NAME;
+ tsigkey->alglen = sizeof(TSIG_HMACSHA384_NAME) - 1;
+ } else if (!strncasecmp(alg, "hmac-sha512:", 12)) {
+ md = EVP_sha512();
+ tsigkey->alg = TSIG_HMACSHA512_NAME;
+ tsigkey->alglen = sizeof(TSIG_HMACSHA512_NAME) - 1;
+ } else {
+ perf_log_warning("invalid TSIG algorithm %.*s", (int)alglen, alg);
+ perf_opt_usage();
+ exit(1);
+ }
+
+ if (namelen > sizeof(tsigkey->name)) {
+ perf_log_fatal("unable to setup TSIG, name too long");
+ // fix clang scan-build / sonarcloud:
+ free(tsigkey);
+ return 0;
+ }
+ memcpy(tsigkey->name, name, namelen);
+ tsigkey->namelen = namelen;
+ for (namelen = 0; namelen < tsigkey->namelen; namelen++) {
+ tsigkey->name[namelen] = tolower(tsigkey->name[namelen]);
+ }
+
+ /* Secret */
+
+ secretlen = strlen(secret);
+ if (!secretlen) {
+ perf_log_warning("unable to setup TSIG, secret empty");
+ perf_opt_usage();
+ exit(1);
+ }
+
+ keylen = secretlen;
+ unsigned char* key = decode64(secret, &keylen);
+ if (!key) {
+ perf_log_fatal("unable to setup TSIG, invalid base64 secret");
+ }
+
+ /* Setup HMAC */
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+ if (!(tsigkey->hmac = calloc(1, sizeof(*tsigkey->hmac)))) {
+ perf_log_fatal("unable to setup TSIG, OpenSSL HMAC context failed to be created");
+ }
+ HMAC_CTX_init(tsigkey->hmac);
+#else
+ if (!(tsigkey->hmac = HMAC_CTX_new())) {
+ perf_log_fatal("unable to setup TSIG, OpenSSL HMAC context failed to be created");
+ }
+#endif
+
+ if (!HMAC_Init_ex(tsigkey->hmac, key, keylen, md, 0)) {
+ perf_log_fatal("unable to setup TSIG, OpenSSL HMAC init failed");
+ }
+
+ free(key);
+
+ return tsigkey;
+}
+
+void perf_tsig_destroykey(perf_tsigkey_t** tsigkeyp)
+{
+ assert(tsigkeyp);
+ assert(*tsigkeyp);
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+ HMAC_CTX_cleanup((*tsigkeyp)->hmac);
+ free((*tsigkeyp)->hmac);
+#else
+ HMAC_CTX_free((*tsigkeyp)->hmac);
+#endif
+
+ free(*tsigkeyp);
+ *tsigkeyp = 0;
+}
+
+/*
+ * Appends a TSIG record to the packet.
+ */
+perf_result_t perf_add_tsig(perf_buffer_t* packet, perf_tsigkey_t* tsigkey)
+{
+ unsigned char* base;
+ size_t rdlen, totallen;
+ unsigned char tmpdata[512], md[EVP_MAX_MD_SIZE];
+ unsigned int mdlen;
+ perf_buffer_t tmp;
+ uint32_t now;
+ perf_result_t result;
+
+ now = time(NULL);
+
+ if (!HMAC_Init_ex(tsigkey->hmac, 0, 0, 0, 0)) {
+ perf_log_fatal("adding TSIG: OpenSSL HMAC reinit failed");
+ }
+
+ if (!HMAC_Update(tsigkey->hmac, perf_buffer_base(packet), perf_buffer_usedlength(packet))) {
+ perf_log_fatal("adding TSIG: OpenSSL HMAC update failed");
+ }
+
+ /* Digest the TSIG record */
+ perf_buffer_init(&tmp, tmpdata, sizeof tmpdata);
+ switch ((result = perf_dname_fromstring(tsigkey->name, tsigkey->namelen, &tmp))) {
+ case PERF_R_SUCCESS:
+ break;
+ case PERF_R_NOSPACE:
+ perf_log_warning("adding TSIG: out of space in digest record");
+ return result;
+ default:
+ perf_log_warning("adding TSIG: invalid owner name");
+ return result;
+ }
+ perf_buffer_putuint16(&tmp, 255); /* class ANY */
+ perf_buffer_putuint32(&tmp, 0); /* ttl */
+ switch ((result = perf_dname_fromstring(tsigkey->alg, tsigkey->alglen, &tmp))) {
+ case PERF_R_SUCCESS:
+ break;
+ case PERF_R_NOSPACE:
+ perf_log_warning("adding TSIG: out of space in digest record");
+ return result;
+ default:
+ perf_log_warning("adding TSIG: invalid algorithm name");
+ return result;
+ }
+ perf_buffer_putuint16(&tmp, 0); /* time high */
+ perf_buffer_putuint32(&tmp, now); /* time low */
+ perf_buffer_putuint16(&tmp, 300); /* fudge */
+ perf_buffer_putuint16(&tmp, 0); /* error */
+ perf_buffer_putuint16(&tmp, 0); /* other length */
+
+ if (!HMAC_Update(tsigkey->hmac, perf_buffer_base(&tmp), perf_buffer_usedlength(&tmp))) {
+ perf_log_fatal("adding TSIG: OpenSSL HMAC update failed");
+ }
+
+ mdlen = sizeof(md);
+ if (!HMAC_Final(tsigkey->hmac, md, &mdlen)) {
+ perf_log_fatal("adding TSIG: OpenSSL HMAC final failed");
+ }
+
+ /* Make sure everything will fit */
+ rdlen = tsigkey->alglen + 18 + mdlen;
+ totallen = tsigkey->namelen + 12 + rdlen;
+ if (totallen > perf_buffer_availablelength(packet)) {
+ perf_log_warning("adding TSIG: out of space");
+ return PERF_R_NOSPACE;
+ }
+
+ base = perf_buffer_base(packet);
+
+ /* Add the TSIG record. */
+ switch ((result = perf_dname_fromstring(tsigkey->name, tsigkey->namelen, packet))) {
+ case PERF_R_SUCCESS:
+ break;
+ case PERF_R_NOSPACE:
+ perf_log_warning("adding TSIG: out of space");
+ return result;
+ default:
+ perf_log_warning("adding TSIG: invalid owner name");
+ return result;
+ }
+ perf_buffer_putuint16(packet, 250); /* type TSIG */
+ perf_buffer_putuint16(packet, 255); /* class ANY */
+ perf_buffer_putuint32(packet, 0); /* ttl */
+ perf_buffer_putuint16(packet, rdlen); /* rdlen */
+ switch ((result = perf_dname_fromstring(tsigkey->alg, tsigkey->alglen, packet))) {
+ case PERF_R_SUCCESS:
+ break;
+ case PERF_R_NOSPACE:
+ perf_log_warning("adding TSIG: out of space");
+ return result;
+ default:
+ perf_log_warning("adding TSIG: invalid algorithm name");
+ return result;
+ }
+ perf_buffer_putuint16(packet, 0); /* time high */
+ perf_buffer_putuint32(packet, now); /* time low */
+ perf_buffer_putuint16(packet, 300); /* fudge */
+ perf_buffer_putuint16(packet, mdlen); /* digest len */
+ perf_buffer_putmem(packet, md, mdlen); /* digest */
+ perf_buffer_putmem(packet, base, 2); /* orig ID */
+ perf_buffer_putuint16(packet, 0); /* error */
+ perf_buffer_putuint16(packet, 0); /* other len */
+
+ base[11]++; /* increment additional record count */
+
+ return PERF_R_SUCCESS;
+}
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