From 212facacdeae1b5c004860500b03ee33dc5a2240 Mon Sep 17 00:00:00 2001 From: Ben Lindstrom Date: Fri, 22 Mar 2002 01:39:44 +0000 Subject: - markus@cvs.openbsd.org 2002/03/18 17:13:15 [cipher.c cipher.h] export/import cipher states; needed by ssh-privsep --- cipher.c | 175 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 174 insertions(+), 1 deletion(-) (limited to 'cipher.c') diff --git a/cipher.c b/cipher.c index 9e8f42f5e..7a9c9c491 100644 --- a/cipher.c +++ b/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 1.53 2002/03/18 17:13:15 markus Exp $"); #include "xmalloc.h" #include "log.h" @@ -88,6 +88,11 @@ 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) @@ -502,6 +507,174 @@ ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE, plain-=RIJNDAEL_BLOCKSIZE) { rijndael_decrypt(&c->r_ctx, cnow, plain); +} + +/* + * 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", __FUNCTION__, + evplen, len); + + if (strncmp(c->name, "aes", 3) == 0) { + struct ssh_rijndael_ctx *aesc; + + aesc = EVP_CIPHER_CTX_get_app_data(&cc->evp); + if (aesc == NULL) + fatal("%s: no rijndael context", __FUNCTION__); + civ = aesc->r_iv; + } else { + civ = cc->evp.iv; + } + break; + case SSH_CIPHER_3DES: { + struct ssh1_3des_ctx *desc; + if (len != 24) + fatal("%s: bad 3des iv length: %d", __FUNCTION__, len); + desc = EVP_CIPHER_CTX_get_app_data(&cc->evp); + if (desc == NULL) + fatal("%s: no 3des context", __FUNCTION__); + debug3("%s: Copying 3DES IV", __FUNCTION__); + 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", __FUNCTION__, 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 (strncmp(c->name, "aes", 3) == 0) { + struct ssh_rijndael_ctx *aesc; + + aesc = EVP_CIPHER_CTX_get_app_data(&cc->evp); + if (aesc == NULL) + fatal("%s: no rijndael context", __FUNCTION__); + div = aesc->r_iv; + }else { + 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", __FUNCTION__); + debug3("%s: Installed 3DES IV", __FUNCTION__); + 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", __FUNCTION__, 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; + + if (c->number == 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", __FUNCTION__); + plen = EVP_X_STATE_LEN(desc->k1); + if (dat == NULL) + return (3*plen); + memcpy(dat, EVP_X_STATE(desc->k1), plen); + memcpy(dat + plen, EVP_X_STATE(desc->k2), plen); + memcpy(dat + 2*plen, EVP_X_STATE(desc->k3), plen); + return (3*plen); + } + + /* Generic EVP */ + 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->number == 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", __FUNCTION__); + plen = EVP_X_STATE_LEN(desc->k1); + memcpy(EVP_X_STATE(desc->k1), dat, plen); + memcpy(EVP_X_STATE(desc->k2), dat + plen, plen); + memcpy(EVP_X_STATE(desc->k3), dat + 2*plen, plen); + } else { + plen = EVP_X_STATE_LEN(cc->evp); + memcpy(EVP_X_STATE(cc->evp), dat, plen); + } ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE; for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++) plain[j] ^= ivp[j]; -- cgit v1.2.3