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author | Dag-Erling Smørgrav <des@FreeBSD.org> | 2014-01-30 10:56:49 +0000 |
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committer | Dag-Erling Smørgrav <des@FreeBSD.org> | 2014-01-30 10:56:49 +0000 |
commit | 02d4c2ac3daa0f36264392972709ccd7676ab3e8 (patch) | |
tree | 6c519c109631364b652faced88b665da4b6058ae /kex.c | |
parent | ff96c0c81d9ee141236b95d52ad0578684d59ab5 (diff) | |
download | src-02d4c2ac3daa0f36264392972709ccd7676ab3e8.tar.gz src-02d4c2ac3daa0f36264392972709ccd7676ab3e8.zip |
Vendor import of OpenSSH 6.5p1.vendor/openssh/6.5p1
Notes
Notes:
svn path=/vendor-crypto/openssh/dist/; revision=261287
svn path=/vendor-crypto/openssh/6.5p1/; revision=261288; tag=vendor/openssh/6.5p1
Diffstat (limited to 'kex.c')
-rw-r--r-- | kex.c | 143 |
1 files changed, 87 insertions, 56 deletions
@@ -1,4 +1,4 @@ -/* $OpenBSD: kex.c,v 1.91 2013/05/17 00:13:13 djm Exp $ */ +/* $OpenBSD: kex.c,v 1.97 2014/01/25 20:35:37 markus Exp $ */ /* * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. * @@ -49,6 +49,7 @@ #include "dispatch.h" #include "monitor.h" #include "roaming.h" +#include "digest.h" #if OPENSSL_VERSION_NUMBER >= 0x00907000L # if defined(HAVE_EVP_SHA256) @@ -66,25 +67,34 @@ struct kexalg { char *name; int type; int ec_nid; - const EVP_MD *(*mdfunc)(void); + int hash_alg; }; static const struct kexalg kexalgs[] = { - { KEX_DH1, KEX_DH_GRP1_SHA1, 0, EVP_sha1 }, - { KEX_DH14, KEX_DH_GRP14_SHA1, 0, EVP_sha1 }, - { KEX_DHGEX_SHA1, KEX_DH_GEX_SHA1, 0, EVP_sha1 }, + { KEX_DH1, KEX_DH_GRP1_SHA1, 0, SSH_DIGEST_SHA1 }, + { KEX_DH14, KEX_DH_GRP14_SHA1, 0, SSH_DIGEST_SHA1 }, + { KEX_DHGEX_SHA1, KEX_DH_GEX_SHA1, 0, SSH_DIGEST_SHA1 }, #ifdef HAVE_EVP_SHA256 - { KEX_DHGEX_SHA256, KEX_DH_GEX_SHA256, 0, EVP_sha256 }, + { KEX_DHGEX_SHA256, KEX_DH_GEX_SHA256, 0, SSH_DIGEST_SHA256 }, #endif #ifdef OPENSSL_HAS_ECC - { KEX_ECDH_SHA2_NISTP256, KEX_ECDH_SHA2, NID_X9_62_prime256v1, EVP_sha256 }, - { KEX_ECDH_SHA2_NISTP384, KEX_ECDH_SHA2, NID_secp384r1, EVP_sha384 }, - { KEX_ECDH_SHA2_NISTP521, KEX_ECDH_SHA2, NID_secp521r1, EVP_sha512 }, + { KEX_ECDH_SHA2_NISTP256, KEX_ECDH_SHA2, + NID_X9_62_prime256v1, SSH_DIGEST_SHA256 }, + { KEX_ECDH_SHA2_NISTP384, KEX_ECDH_SHA2, NID_secp384r1, + SSH_DIGEST_SHA384 }, +# ifdef OPENSSL_HAS_NISTP521 + { KEX_ECDH_SHA2_NISTP521, KEX_ECDH_SHA2, NID_secp521r1, + SSH_DIGEST_SHA512 }, +# endif +#endif + { KEX_DH1, KEX_DH_GRP1_SHA1, 0, SSH_DIGEST_SHA1 }, +#ifdef HAVE_EVP_SHA256 + { KEX_CURVE25519_SHA256, KEX_C25519_SHA256, 0, SSH_DIGEST_SHA256 }, #endif - { NULL, -1, -1, NULL}, + { NULL, -1, -1, -1}, }; char * -kex_alg_list(void) +kex_alg_list(char sep) { char *ret = NULL; size_t nlen, rlen = 0; @@ -92,7 +102,7 @@ kex_alg_list(void) for (k = kexalgs; k->name != NULL; k++) { if (ret != NULL) - ret[rlen++] = '\n'; + ret[rlen++] = sep; nlen = strlen(k->name); ret = xrealloc(ret, 1, rlen + nlen + 2); memcpy(ret + rlen, k->name, nlen + 1); @@ -401,7 +411,7 @@ choose_kex(Kex *k, char *client, char *server) if ((kexalg = kex_alg_by_name(k->name)) == NULL) fatal("unsupported kex alg %s", k->name); k->kex_type = kexalg->type; - k->evp_md = kexalg->mdfunc(); + k->hash_alg = kexalg->hash_alg; k->ec_nid = kexalg->ec_nid; } @@ -448,7 +458,7 @@ kex_choose_conf(Kex *kex) char **my, **peer; char **cprop, **sprop; int nenc, nmac, ncomp; - u_int mode, ctos, need, authlen; + u_int mode, ctos, need, dh_need, authlen; int first_kex_follows, type; my = kex_buf2prop(&kex->my, NULL); @@ -496,20 +506,21 @@ kex_choose_conf(Kex *kex) choose_kex(kex, cprop[PROPOSAL_KEX_ALGS], sprop[PROPOSAL_KEX_ALGS]); choose_hostkeyalg(kex, cprop[PROPOSAL_SERVER_HOST_KEY_ALGS], sprop[PROPOSAL_SERVER_HOST_KEY_ALGS]); - need = 0; + need = dh_need = 0; for (mode = 0; mode < MODE_MAX; mode++) { newkeys = kex->newkeys[mode]; - if (need < newkeys->enc.key_len) - need = newkeys->enc.key_len; - if (need < newkeys->enc.block_size) - need = newkeys->enc.block_size; - if (need < newkeys->enc.iv_len) - need = newkeys->enc.iv_len; - if (need < newkeys->mac.key_len) - need = newkeys->mac.key_len; + need = MAX(need, newkeys->enc.key_len); + need = MAX(need, newkeys->enc.block_size); + need = MAX(need, newkeys->enc.iv_len); + need = MAX(need, newkeys->mac.key_len); + dh_need = MAX(dh_need, cipher_seclen(newkeys->enc.cipher)); + dh_need = MAX(dh_need, newkeys->enc.block_size); + dh_need = MAX(dh_need, newkeys->enc.iv_len); + dh_need = MAX(dh_need, newkeys->mac.key_len); } /* XXX need runden? */ kex->we_need = need; + kex->dh_need = dh_need; /* ignore the next message if the proposals do not match */ if (first_kex_follows && !proposals_match(my, peer) && @@ -524,30 +535,34 @@ kex_choose_conf(Kex *kex) static u_char * derive_key(Kex *kex, int id, u_int need, u_char *hash, u_int hashlen, - BIGNUM *shared_secret) + const u_char *shared_secret, u_int slen) { Buffer b; - EVP_MD_CTX md; + struct ssh_digest_ctx *hashctx; char c = id; u_int have; - int mdsz; + size_t mdsz; u_char *digest; - if ((mdsz = EVP_MD_size(kex->evp_md)) <= 0) - fatal("bad kex md size %d", mdsz); + if ((mdsz = ssh_digest_bytes(kex->hash_alg)) == 0) + fatal("bad kex md size %zu", mdsz); digest = xmalloc(roundup(need, mdsz)); buffer_init(&b); - buffer_put_bignum2(&b, shared_secret); + buffer_append(&b, shared_secret, slen); /* K1 = HASH(K || H || "A" || session_id) */ - EVP_DigestInit(&md, kex->evp_md); - if (!(datafellows & SSH_BUG_DERIVEKEY)) - EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); - EVP_DigestUpdate(&md, hash, hashlen); - EVP_DigestUpdate(&md, &c, 1); - EVP_DigestUpdate(&md, kex->session_id, kex->session_id_len); - EVP_DigestFinal(&md, digest, NULL); + if ((hashctx = ssh_digest_start(kex->hash_alg)) == NULL) + fatal("%s: ssh_digest_start failed", __func__); + if (ssh_digest_update_buffer(hashctx, &b) != 0 || + ssh_digest_update(hashctx, hash, hashlen) != 0 || + ssh_digest_update(hashctx, &c, 1) != 0 || + ssh_digest_update(hashctx, kex->session_id, + kex->session_id_len) != 0) + fatal("%s: ssh_digest_update failed", __func__); + if (ssh_digest_final(hashctx, digest, mdsz) != 0) + fatal("%s: ssh_digest_final failed", __func__); + ssh_digest_free(hashctx); /* * expand key: @@ -555,12 +570,15 @@ derive_key(Kex *kex, int id, u_int need, u_char *hash, u_int hashlen, * Key = K1 || K2 || ... || Kn */ for (have = mdsz; need > have; have += mdsz) { - EVP_DigestInit(&md, kex->evp_md); - if (!(datafellows & SSH_BUG_DERIVEKEY)) - EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); - EVP_DigestUpdate(&md, hash, hashlen); - EVP_DigestUpdate(&md, digest, have); - EVP_DigestFinal(&md, digest + have, NULL); + if ((hashctx = ssh_digest_start(kex->hash_alg)) == NULL) + fatal("%s: ssh_digest_start failed", __func__); + if (ssh_digest_update_buffer(hashctx, &b) != 0 || + ssh_digest_update(hashctx, hash, hashlen) != 0 || + ssh_digest_update(hashctx, digest, have) != 0) + fatal("%s: ssh_digest_update failed", __func__); + if (ssh_digest_final(hashctx, digest + have, mdsz) != 0) + fatal("%s: ssh_digest_final failed", __func__); + ssh_digest_free(hashctx); } buffer_free(&b); #ifdef DEBUG_KEX @@ -574,14 +592,15 @@ Newkeys *current_keys[MODE_MAX]; #define NKEYS 6 void -kex_derive_keys(Kex *kex, u_char *hash, u_int hashlen, BIGNUM *shared_secret) +kex_derive_keys(Kex *kex, u_char *hash, u_int hashlen, + const u_char *shared_secret, u_int slen) { u_char *keys[NKEYS]; u_int i, mode, ctos; for (i = 0; i < NKEYS; i++) { keys[i] = derive_key(kex, 'A'+i, kex->we_need, hash, hashlen, - shared_secret); + shared_secret, slen); } debug2("kex_derive_keys"); @@ -596,6 +615,18 @@ kex_derive_keys(Kex *kex, u_char *hash, u_int hashlen, BIGNUM *shared_secret) } } +void +kex_derive_keys_bn(Kex *kex, u_char *hash, u_int hashlen, const BIGNUM *secret) +{ + Buffer shared_secret; + + buffer_init(&shared_secret); + buffer_put_bignum2(&shared_secret, secret); + kex_derive_keys(kex, hash, hashlen, + buffer_ptr(&shared_secret), buffer_len(&shared_secret)); + buffer_free(&shared_secret); +} + Newkeys * kex_get_newkeys(int mode) { @@ -610,33 +641,33 @@ void derive_ssh1_session_id(BIGNUM *host_modulus, BIGNUM *server_modulus, u_int8_t cookie[8], u_int8_t id[16]) { - const EVP_MD *evp_md = EVP_md5(); - EVP_MD_CTX md; - u_int8_t nbuf[2048], obuf[EVP_MAX_MD_SIZE]; + u_int8_t nbuf[2048], obuf[SSH_DIGEST_MAX_LENGTH]; int len; + struct ssh_digest_ctx *hashctx; - EVP_DigestInit(&md, evp_md); + if ((hashctx = ssh_digest_start(SSH_DIGEST_MD5)) == NULL) + fatal("%s: ssh_digest_start", __func__); len = BN_num_bytes(host_modulus); if (len < (512 / 8) || (u_int)len > sizeof(nbuf)) fatal("%s: bad host modulus (len %d)", __func__, len); BN_bn2bin(host_modulus, nbuf); - EVP_DigestUpdate(&md, nbuf, len); + if (ssh_digest_update(hashctx, nbuf, len) != 0) + fatal("%s: ssh_digest_update failed", __func__); len = BN_num_bytes(server_modulus); if (len < (512 / 8) || (u_int)len > sizeof(nbuf)) fatal("%s: bad server modulus (len %d)", __func__, len); BN_bn2bin(server_modulus, nbuf); - EVP_DigestUpdate(&md, nbuf, len); - - EVP_DigestUpdate(&md, cookie, 8); - - EVP_DigestFinal(&md, obuf, NULL); - memcpy(id, obuf, 16); + if (ssh_digest_update(hashctx, nbuf, len) != 0 || + ssh_digest_update(hashctx, cookie, 8) != 0) + fatal("%s: ssh_digest_update failed", __func__); + if (ssh_digest_final(hashctx, obuf, sizeof(obuf)) != 0) + fatal("%s: ssh_digest_final failed", __func__); + memcpy(id, obuf, ssh_digest_bytes(SSH_DIGEST_MD5)); memset(nbuf, 0, sizeof(nbuf)); memset(obuf, 0, sizeof(obuf)); - memset(&md, 0, sizeof(md)); } #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH) |