diff options
Diffstat (limited to 'crypto/openssh/cipher.c')
| -rw-r--r-- | crypto/openssh/cipher.c | 192 |
1 files changed, 181 insertions, 11 deletions
diff --git a/crypto/openssh/cipher.c b/crypto/openssh/cipher.c index 806c5c1..0892423 100644 --- a/crypto/openssh/cipher.c +++ b/crypto/openssh/cipher.c @@ -35,7 +35,7 @@ */ #include "includes.h" -RCSID("$OpenBSD: cipher.c,v 1.52 2002/02/18 13:05:32 markus Exp $"); +RCSID("$OpenBSD: cipher.c,v 1.59 2002/06/19 18:01:00 markus Exp $"); RCSID("$FreeBSD$"); #include "xmalloc.h" @@ -43,18 +43,20 @@ RCSID("$FreeBSD$"); #include "cipher.h" #include <openssl/md5.h> -#include "rijndael.h" -static EVP_CIPHER *evp_ssh1_3des(void); -static EVP_CIPHER *evp_ssh1_bf(void); -static EVP_CIPHER *evp_rijndael(void); +#if OPENSSL_VERSION_NUMBER < 0x00907000L +#include "rijndael.h" +static const EVP_CIPHER *evp_rijndael(void); +#endif +static const EVP_CIPHER *evp_ssh1_3des(void); +static const EVP_CIPHER *evp_ssh1_bf(void); struct Cipher { char *name; int number; /* for ssh1 only */ u_int block_size; u_int key_len; - EVP_CIPHER *(*evptype)(void); + const EVP_CIPHER *(*evptype)(void); } ciphers[] = { { "none", SSH_CIPHER_NONE, 8, 0, EVP_enc_null }, { "des", SSH_CIPHER_DES, 8, 8, EVP_des_cbc }, @@ -65,25 +67,40 @@ struct Cipher { { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc }, { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc }, { "arcfour", SSH_CIPHER_SSH2, 8, 16, EVP_rc4 }, +#if OPENSSL_VERSION_NUMBER < 0x00907000L { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, evp_rijndael }, { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, evp_rijndael }, { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, evp_rijndael }, + { "rijndael-cbc@lysator.liu.se", + SSH_CIPHER_SSH2, 16, 32, evp_rijndael }, +#else + { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, EVP_aes_128_cbc }, + { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, EVP_aes_192_cbc }, + { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc }, + { "rijndael-cbc@lysator.liu.se", + SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc }, +#endif { NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL } }; /*--*/ -u_int +u_int cipher_blocksize(Cipher *c) { return (c->block_size); } -u_int +u_int cipher_keylen(Cipher *c) { return (c->key_len); } +u_int +cipher_get_number(Cipher *c) +{ + return (c->number); +} u_int cipher_mask_ssh1(int client) @@ -334,7 +351,7 @@ ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx) } return (1); } -static EVP_CIPHER * +static const EVP_CIPHER * evp_ssh1_3des(void) { static EVP_CIPHER ssh1_3des; @@ -384,7 +401,7 @@ bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len) swap_bytes(out, out, len); return (ret); } -static EVP_CIPHER * +static const EVP_CIPHER * evp_ssh1_bf(void) { static EVP_CIPHER ssh1_bf; @@ -397,6 +414,7 @@ evp_ssh1_bf(void) return (&ssh1_bf); } +#if OPENSSL_VERSION_NUMBER < 0x00907000L /* RIJNDAEL */ #define RIJNDAEL_BLOCKSIZE 16 struct ssh_rijndael_ctx @@ -482,7 +500,7 @@ ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx) } return (1); } -static EVP_CIPHER * +static const EVP_CIPHER * evp_rijndael(void) { static EVP_CIPHER rijndal_cbc; @@ -499,3 +517,155 @@ evp_rijndael(void) EVP_CIPH_ALWAYS_CALL_INIT; return (&rijndal_cbc); } +#endif + +/* + * Exports an IV from the CipherContext required to export the key + * state back from the unprivileged child to the privileged parent + * process. + */ + +int +cipher_get_keyiv_len(CipherContext *cc) +{ + Cipher *c = cc->cipher; + int ivlen; + + if (c->number == SSH_CIPHER_3DES) + ivlen = 24; + else + ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp); + return (ivlen); +} + +void +cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len) +{ + Cipher *c = cc->cipher; + u_char *civ = NULL; + int evplen; + + switch (c->number) { + case SSH_CIPHER_SSH2: + case SSH_CIPHER_DES: + case SSH_CIPHER_BLOWFISH: + evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); + if (evplen == 0) + return; + if (evplen != len) + fatal("%s: wrong iv length %d != %d", __func__, + evplen, len); + +#if OPENSSL_VERSION_NUMBER < 0x00907000L + if (c->evptype == evp_rijndael) { + struct ssh_rijndael_ctx *aesc; + + aesc = EVP_CIPHER_CTX_get_app_data(&cc->evp); + if (aesc == NULL) + fatal("%s: no rijndael context", __func__); + civ = aesc->r_iv; + } else +#endif + { + civ = cc->evp.iv; + } + break; + case SSH_CIPHER_3DES: { + struct ssh1_3des_ctx *desc; + if (len != 24) + fatal("%s: bad 3des iv length: %d", __func__, len); + desc = EVP_CIPHER_CTX_get_app_data(&cc->evp); + if (desc == NULL) + fatal("%s: no 3des context", __func__); + debug3("%s: Copying 3DES IV", __func__); + memcpy(iv, desc->k1.iv, 8); + memcpy(iv + 8, desc->k2.iv, 8); + memcpy(iv + 16, desc->k3.iv, 8); + return; + } + default: + fatal("%s: bad cipher %d", __func__, c->number); + } + memcpy(iv, civ, len); +} + +void +cipher_set_keyiv(CipherContext *cc, u_char *iv) +{ + Cipher *c = cc->cipher; + u_char *div = NULL; + int evplen = 0; + + switch (c->number) { + case SSH_CIPHER_SSH2: + case SSH_CIPHER_DES: + case SSH_CIPHER_BLOWFISH: + evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); + if (evplen == 0) + return; + +#if OPENSSL_VERSION_NUMBER < 0x00907000L + if (c->evptype == evp_rijndael) { + struct ssh_rijndael_ctx *aesc; + + aesc = EVP_CIPHER_CTX_get_app_data(&cc->evp); + if (aesc == NULL) + fatal("%s: no rijndael context", __func__); + div = aesc->r_iv; + } else +#endif + { + div = cc->evp.iv; + } + break; + case SSH_CIPHER_3DES: { + struct ssh1_3des_ctx *desc; + desc = EVP_CIPHER_CTX_get_app_data(&cc->evp); + if (desc == NULL) + fatal("%s: no 3des context", __func__); + debug3("%s: Installed 3DES IV", __func__); + memcpy(desc->k1.iv, iv, 8); + memcpy(desc->k2.iv, iv + 8, 8); + memcpy(desc->k3.iv, iv + 16, 8); + return; + } + default: + fatal("%s: bad cipher %d", __func__, c->number); + } + memcpy(div, iv, evplen); +} + +#if OPENSSL_VERSION_NUMBER < 0x00907000L +#define EVP_X_STATE(evp) &(evp).c +#define EVP_X_STATE_LEN(evp) sizeof((evp).c) +#else +#define EVP_X_STATE(evp) (evp).cipher_data +#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size +#endif + +int +cipher_get_keycontext(CipherContext *cc, u_char *dat) +{ + Cipher *c = cc->cipher; + int plen = 0; + + if (c->evptype == EVP_rc4) { + plen = EVP_X_STATE_LEN(cc->evp); + if (dat == NULL) + return (plen); + memcpy(dat, EVP_X_STATE(cc->evp), plen); + } + return (plen); +} + +void +cipher_set_keycontext(CipherContext *cc, u_char *dat) +{ + Cipher *c = cc->cipher; + int plen; + + if (c->evptype == EVP_rc4) { + plen = EVP_X_STATE_LEN(cc->evp); + memcpy(EVP_X_STATE(cc->evp), dat, plen); + } +} |
