*/
#include "includes.h"
-RCSID("$OpenBSD: cipher.c,v 1.52 2002/02/18 13:05:32 markus Exp $");
+RCSID("$OpenBSD: cipher.c,v 1.60 2002/06/23 03:26:52 deraadt Exp $");
#include "xmalloc.h"
#include "log.h"
#include "cipher.h"
#include <openssl/md5.h>
-#include "rijndael.h"
#if OPENSSL_VERSION_NUMBER < 0x00906000L
#define SSH_OLD_EVP
#define EVP_CIPHER_CTX_get_app_data(e) ((e)->app_data)
#endif
-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 },
{ "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)
{
{
EVP_CIPHER_CTX k1, k2, k3;
};
+
static int
ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
int enc)
#endif
return (1);
}
+
static int
ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len)
{
#endif
return (1);
}
+
static int
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;
*dst++ = c[3];
}
}
+
static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL;
+
static int
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;
return (&ssh1_bf);
}
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
/* RIJNDAEL */
#define RIJNDAEL_BLOCKSIZE 16
struct ssh_rijndael_ctx
memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE);
return (1);
}
+
static int
ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src,
u_int len)
}
return (1);
}
+
static int
ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx)
{
}
return (1);
}
-static EVP_CIPHER *
+
+static const EVP_CIPHER *
evp_rijndael(void)
{
static EVP_CIPHER rijndal_cbc;
#endif
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);
+ }
+}
andersk / openssh.git / blobdiff