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key.c
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key.c
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/* $OpenBSD: key.c,v 1.69 2007/07/12 05:48:05 ray Exp $ */
/*
* read_bignum():
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*
*
* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* My single line "return -1; / * avoid compiler warning * / is licensed
* under same BSD style license as the remainder of this file.
* Feel free to use it for any purpose... ... ... Jamie Beverly ... ... ...
*/
#include "includes.h"
#include <sys/types.h>
#include <openssl/evp.h>
#include <openbsd-compat/openssl-compat.h>
#include <openssl/rand.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "xmalloc.h"
#include "key.h"
#include "rsa.h"
#include "uuencode.h"
#include "buffer.h"
#include "log.h"
#define CB_MAX_ECPOINT ((528 * 2 / 8) + 1)
Key *
pamsshagentauth_key_new(int type)
{
Key *k;
RSA *rsa;
DSA *dsa;
ED25519 *ed25519;
k = pamsshagentauth_xcalloc(1, sizeof(*k));
k->type = type;
k->dsa = NULL;
k->rsa = NULL;
k->ecdsa = NULL;
k->ed25519 = NULL;
switch (k->type) {
case KEY_RSA1:
case KEY_RSA:
if ((rsa = RSA_new()) == NULL)
pamsshagentauth_fatal("key_new: RSA_new failed");
if ((rsa->n = BN_new()) == NULL)
pamsshagentauth_fatal("key_new: BN_new failed");
if ((rsa->e = BN_new()) == NULL)
pamsshagentauth_fatal("key_new: BN_new failed");
k->rsa = rsa;
break;
case KEY_DSA:
if ((dsa = DSA_new()) == NULL)
pamsshagentauth_fatal("key_new: DSA_new failed");
if ((dsa->p = BN_new()) == NULL)
pamsshagentauth_fatal("key_new: BN_new failed");
if ((dsa->q = BN_new()) == NULL)
pamsshagentauth_fatal("key_new: BN_new failed");
if ((dsa->g = BN_new()) == NULL)
pamsshagentauth_fatal("key_new: BN_new failed");
if ((dsa->pub_key = BN_new()) == NULL)
pamsshagentauth_fatal("key_new: BN_new failed");
k->dsa = dsa;
break;
case KEY_ECDSA:
// do nothing until we know which group
break;
case KEY_ED25519:
ed25519 = (ED25519*)pamsshagentauth_xcalloc(1, sizeof(ED25519));
k->ed25519 = ed25519;
break;
case KEY_UNSPEC:
break;
default:
pamsshagentauth_fatal("key_new: bad key type %d", k->type);
break;
}
return k;
}
Key *
pamsshagentauth_key_new_private(int type)
{
Key *k = pamsshagentauth_key_new(type);
switch (k->type) {
case KEY_RSA1:
case KEY_RSA:
if ((k->rsa->d = BN_new()) == NULL)
pamsshagentauth_fatal("key_new_private: BN_new failed");
if ((k->rsa->iqmp = BN_new()) == NULL)
pamsshagentauth_fatal("key_new_private: BN_new failed");
if ((k->rsa->q = BN_new()) == NULL)
pamsshagentauth_fatal("key_new_private: BN_new failed");
if ((k->rsa->p = BN_new()) == NULL)
pamsshagentauth_fatal("key_new_private: BN_new failed");
if ((k->rsa->dmq1 = BN_new()) == NULL)
pamsshagentauth_fatal("key_new_private: BN_new failed");
if ((k->rsa->dmp1 = BN_new()) == NULL)
pamsshagentauth_fatal("key_new_private: BN_new failed");
break;
case KEY_DSA:
if ((k->dsa->priv_key = BN_new()) == NULL)
pamsshagentauth_fatal("key_new_private: BN_new failed");
break;
case KEY_ECDSA:
if (EC_KEY_set_private_key(k->ecdsa, BN_new()) != 1)
pamsshagentauth_fatal("key_new_private: EC_KEY_set_private_key failed");
break;
case KEY_ED25519:
RAND_bytes(k->ed25519->sk, sizeof(k->ed25519->sk));
break;
case KEY_UNSPEC:
break;
default:
break;
}
return k;
}
void
pamsshagentauth_key_free(Key *k)
{
if (k == NULL)
pamsshagentauth_fatal("key_free: key is NULL");
switch (k->type) {
case KEY_RSA1:
case KEY_RSA:
if (k->rsa != NULL)
RSA_free(k->rsa);
k->rsa = NULL;
break;
case KEY_DSA:
if (k->dsa != NULL)
DSA_free(k->dsa);
k->dsa = NULL;
break;
case KEY_ECDSA:
if (k->ecdsa != NULL)
EC_KEY_free(k->ecdsa);
k->ecdsa = NULL;
break;
case KEY_ED25519:
if (k->ed25519 != NULL)
pamsshagentauth_xfree(k->ed25519);
k->ed25519 = NULL;
break;
case KEY_UNSPEC:
break;
default:
pamsshagentauth_fatal("key_free: bad key type %d", k->type);
break;
}
pamsshagentauth_xfree(k);
}
int
pamsshagentauth_key_equal(const Key *a, const Key *b)
{
if (a == NULL || b == NULL || a->type != b->type)
return 0;
switch (a->type) {
case KEY_RSA1:
case KEY_RSA:
return a->rsa != NULL && b->rsa != NULL &&
BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
BN_cmp(a->rsa->n, b->rsa->n) == 0;
case KEY_DSA:
return a->dsa != NULL && b->dsa != NULL &&
BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
case KEY_ECDSA:
return a->ecdsa != NULL && b->ecdsa != NULL &&
EC_KEY_check_key(a->ecdsa) == 1 &&
EC_KEY_check_key(b->ecdsa) == 1 &&
EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
EC_KEY_get0_group(a->ecdsa), NULL) == 0 &&
EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
EC_KEY_get0_public_key(a->ecdsa),
EC_KEY_get0_public_key(b->ecdsa), NULL) == 0 &&
BN_cmp(EC_KEY_get0_private_key(a->ecdsa),
EC_KEY_get0_private_key(b->ecdsa)) == 0;
case KEY_ED25519:
return a->ed25519 != NULL && b->ed25519 != NULL &&
memcmp(a->ed25519->sk, b->ed25519->sk,
sizeof(a->ed25519->sk)) == 0 &&
memcmp(a->ed25519->pk, b->ed25519->pk,
sizeof(a->ed25519->pk)) == 0;
default:
pamsshagentauth_fatal("key_equal: bad key type %d", a->type);
}
return -1; /* avoid compiler warning */
}
u_char*
pamsshagentauth_key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
u_int *dgst_raw_length)
{
const EVP_MD *md = NULL;
EVP_MD_CTX ctx;
u_char *blob = NULL;
u_char *retval = NULL;
u_int len = 0;
int nlen, elen;
*dgst_raw_length = 0;
switch (dgst_type) {
case SSH_FP_MD5:
md = EVP_md5();
break;
case SSH_FP_SHA1:
md = EVP_sha1();
break;
default:
pamsshagentauth_fatal("key_fingerprint_raw: bad digest type %d",
dgst_type);
}
switch (k->type) {
case KEY_RSA1:
nlen = BN_num_bytes(k->rsa->n);
elen = BN_num_bytes(k->rsa->e);
len = nlen + elen;
blob = pamsshagentauth_xmalloc(len);
BN_bn2bin(k->rsa->n, blob);
BN_bn2bin(k->rsa->e, blob + nlen);
break;
case KEY_DSA:
case KEY_ECDSA:
case KEY_ED25519:
case KEY_RSA:
pamsshagentauth_key_to_blob(k, &blob, &len);
break;
case KEY_UNSPEC:
return retval;
default:
pamsshagentauth_fatal("key_fingerprint_raw: bad key type %d", k->type);
break;
}
if (blob != NULL) {
retval = pamsshagentauth_xmalloc(EVP_MAX_MD_SIZE);
EVP_DigestInit(&ctx, md);
EVP_DigestUpdate(&ctx, blob, len);
EVP_DigestFinal(&ctx, retval, dgst_raw_length);
memset(blob, 0, len);
pamsshagentauth_xfree(blob);
} else {
pamsshagentauth_fatal("key_fingerprint_raw: blob is null");
}
return retval;
}
static char *
key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
{
char *retval;
u_int i;
retval = pamsshagentauth_xcalloc(1, dgst_raw_len * 3 + 1);
for (i = 0; i < dgst_raw_len; i++) {
char hex[4];
snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
pamsshagentauth_strlcat(retval, hex, dgst_raw_len * 3 + 1);
}
/* Remove the trailing ':' character */
retval[(dgst_raw_len * 3) - 1] = '\0';
return retval;
}
static char *
key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
{
char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
u_int i, j = 0, rounds, seed = 1;
char *retval;
rounds = (dgst_raw_len / 2) + 1;
retval = pamsshagentauth_xcalloc((rounds * 6), sizeof(char));
retval[j++] = 'x';
for (i = 0; i < rounds; i++) {
u_int idx0, idx1, idx2, idx3, idx4;
if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
seed) % 6;
idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
(seed / 6)) % 6;
retval[j++] = vowels[idx0];
retval[j++] = consonants[idx1];
retval[j++] = vowels[idx2];
if ((i + 1) < rounds) {
idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
retval[j++] = consonants[idx3];
retval[j++] = '-';
retval[j++] = consonants[idx4];
seed = ((seed * 5) +
((((u_int)(dgst_raw[2 * i])) * 7) +
((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
}
} else {
idx0 = seed % 6;
idx1 = 16;
idx2 = seed / 6;
retval[j++] = vowels[idx0];
retval[j++] = consonants[idx1];
retval[j++] = vowels[idx2];
}
}
retval[j++] = 'x';
retval[j++] = '\0';
return retval;
}
char *
pamsshagentauth_key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
{
char *retval = NULL;
u_char *dgst_raw;
u_int dgst_raw_len;
dgst_raw = pamsshagentauth_key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
if (!dgst_raw)
pamsshagentauth_fatal("key_fingerprint: null from pamsshagentauth_key_fingerprint_raw()");
switch (dgst_rep) {
case SSH_FP_HEX:
retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
break;
case SSH_FP_BUBBLEBABBLE:
retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
break;
default:
pamsshagentauth_fatal("key_fingerprint_ex: bad digest representation %d",
dgst_rep);
break;
}
memset(dgst_raw, 0, dgst_raw_len);
pamsshagentauth_xfree(dgst_raw);
return retval;
}
/*
* Reads a multiple-precision integer in decimal from the buffer, and advances
* the pointer. The integer must already be initialized. This function is
* permitted to modify the buffer. This leaves *cpp to point just beyond the
* last processed (and maybe modified) character. Note that this may modify
* the buffer containing the number.
*/
static int
read_bignum(char **cpp, BIGNUM * value)
{
char *cp = *cpp;
int old;
/* Skip any leading whitespace. */
for (; *cp == ' ' || *cp == '\t'; cp++)
;
/* Check that it begins with a decimal digit. */
if (*cp < '0' || *cp > '9')
return 0;
/* Save starting position. */
*cpp = cp;
/* Move forward until all decimal digits skipped. */
for (; *cp >= '0' && *cp <= '9'; cp++)
;
/* Save the old terminating character, and replace it by \0. */
old = *cp;
*cp = 0;
/* Parse the number. */
if (BN_dec2bn(&value, *cpp) == 0)
return 0;
/* Restore old terminating character. */
*cp = old;
/* Move beyond the number and return success. */
*cpp = cp;
return 1;
}
static int
write_bignum(FILE *f, BIGNUM *num)
{
char *buf = BN_bn2dec(num);
if (buf == NULL) {
pamsshagentauth_logerror("write_bignum: BN_bn2dec() failed");
return 0;
}
fprintf(f, " %s", buf);
OPENSSL_free(buf);
return 1;
}
/* returns 1 ok, -1 error */
int
pamsshagentauth_key_read(Key *ret, char **cpp)
{
Key *k;
int success = -1;
char *cp, *space;
int len, n, type;
u_int bits;
u_char *blob;
cp = *cpp;
switch (ret->type) {
case KEY_RSA1:
/* Get number of bits. */
if (*cp < '0' || *cp > '9')
return -1; /* Bad bit count... */
for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
bits = 10 * bits + *cp - '0';
if (bits == 0)
return -1;
*cpp = cp;
/* Get public exponent, public modulus. */
if (!read_bignum(cpp, ret->rsa->e))
return -1;
if (!read_bignum(cpp, ret->rsa->n))
return -1;
success = 1;
break;
case KEY_UNSPEC:
case KEY_RSA:
case KEY_DSA:
case KEY_ECDSA:
case KEY_ED25519:
space = strchr(cp, ' ');
if (space == NULL) {
pamsshagentauth_verbose("key_read: missing whitespace");
return -1;
}
*space = '\0';
type = pamsshagentauth_key_type_from_name(cp);
*space = ' ';
if (type == KEY_UNSPEC) {
pamsshagentauth_verbose("key_read: missing keytype");
return -1;
}
cp = space+1;
if (*cp == '\0') {
pamsshagentauth_verbose("key_read: short string");
return -1;
}
if (ret->type == KEY_UNSPEC) {
ret->type = type;
} else if (ret->type != type) {
/* is a key, but different type */
pamsshagentauth_verbose("key_read: type mismatch expected %d found %d", ret->type, type);
return -1;
}
len = 2*strlen(cp);
blob = pamsshagentauth_xmalloc(len);
n = pamsshagentauth_uudecode(cp, blob, len);
if (n < 0) {
pamsshagentauth_logerror("key_read: uudecode %s failed", cp);
pamsshagentauth_xfree(blob);
return -1;
}
k = pamsshagentauth_key_from_blob(blob, (u_int)n);
pamsshagentauth_xfree(blob);
if (k == NULL) {
pamsshagentauth_logerror("key_read: key_from_blob %s failed", cp);
return -1;
}
if (k->type != type) {
pamsshagentauth_logerror("key_read: type mismatch: encoding error");
pamsshagentauth_key_free(k);
return -1;
}
/*XXXX*/
switch (ret->type) {
case (KEY_RSA):
if (ret->rsa != NULL)
RSA_free(ret->rsa);
ret->rsa = k->rsa;
k->rsa = NULL;
success = 1;
#ifdef DEBUG_PK
RSA_print_fp(stderr, ret->rsa, 8);
#endif
break;
case (KEY_DSA):
if (ret->dsa != NULL)
DSA_free(ret->dsa);
ret->dsa = k->dsa;
k->dsa = NULL;
success = 1;
#ifdef DEBUG_PK
DSA_print_fp(stderr, ret->dsa, 8);
#endif
break;
case (KEY_ECDSA):
if (ret->ecdsa != NULL)
EC_KEY_free(ret->ecdsa);
ret->ecdsa = k->ecdsa;
k->ecdsa = NULL;
success = 1;
#ifdef DEBUG_PK
EC_KEY_print_fp(stderr, ret->ecdsa, 8);
#endif
break;
case (KEY_ED25519):
if (ret->ed25519 != NULL)
pamsshagentauth_xfree(ret->ed25519);
ret->ed25519 = k->ed25519;
k->ed25519 = NULL;
success = 1;
#ifdef DEBUG_PK
pamsshagentauth_dump_base64(stderr, (u_char*)ret->ed25519,
sizeof(ret->ed25519));
#endif
break;
}
/*XXXX*/
pamsshagentauth_key_free(k);
if (success != 1)
break;
/* advance cp: skip whitespace and data */
while (*cp == ' ' || *cp == '\t')
cp++;
while (*cp != '\0' && *cp != ' ' && *cp != '\t')
cp++;
*cpp = cp;
break;
default:
pamsshagentauth_fatal("key_read: bad key type: %d", ret->type);
break;
}
return success;
}
int
pamsshagentauth_key_write(const Key *key, FILE *f)
{
int n, success = 0;
u_int len, bits = 0;
u_char *blob;
char *uu;
if (key->type == KEY_RSA1 && key->rsa != NULL) {
/* size of modulus 'n' */
bits = BN_num_bits(key->rsa->n);
fprintf(f, "%u", bits);
if (write_bignum(f, key->rsa->e) &&
write_bignum(f, key->rsa->n)) {
success = 1;
} else {
pamsshagentauth_logerror("key_write: failed for RSA key");
}
} else if ((key->type == KEY_DSA && key->dsa != NULL) ||
(key->type == KEY_RSA && key->rsa != NULL)) {
pamsshagentauth_key_to_blob(key, &blob, &len);
uu = pamsshagentauth_xmalloc(2*len);
n = pamsshagentauth_uuencode(blob, len, uu, 2*len);
if (n > 0) {
fprintf(f, "%s %s", key_ssh_name(key), uu);
success = 1;
}
pamsshagentauth_xfree(blob);
pamsshagentauth_xfree(uu);
}
return success;
}
const char *
pamsshagentauth_key_type(const Key *k)
{
switch (k->type) {
case KEY_RSA1:
return "RSA1";
case KEY_RSA:
return "RSA";
case KEY_DSA:
return "DSA";
case KEY_ECDSA:
return "ECDSA";
case KEY_ED25519:
return "ED25519";
}
return "unknown";
}
const char *
key_ssh_name(const Key *k)
{
switch (k->type) {
case KEY_RSA:
return "ssh-rsa";
case KEY_DSA:
return "ssh-dss";
case KEY_ECDSA:
{
int nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(k->ecdsa));
switch (nid) {
case NID_X9_62_prime256v1:
return "ecdsa-sha2-nistp256";
case NID_secp384r1:
return "ecdsa-sha2-nistp384";
case NID_secp521r1:
return "ecdsa-sha2-nistp521";
}
}
case KEY_ED25519:
return "ssh-ed25519";
}
return "ssh-unknown";
}
const char *
group_ssh_name(const Key *k)
{
switch (k->type) {
case KEY_ECDSA:
{
int nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(k->ecdsa));
switch (nid) {
case NID_X9_62_prime256v1:
return "nistp256";
case NID_secp384r1:
return "nistp384";
case NID_secp521r1:
return "nistp521";
}
}
}
return "ssh-unknown";
}
u_int
pamsshagentauth_key_size(const Key *k)
{
switch (k->type) {
case KEY_RSA1:
case KEY_RSA:
return BN_num_bits(k->rsa->n);
case KEY_DSA:
return BN_num_bits(k->dsa->p);
case KEY_ECDSA:
{
int nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(k->ecdsa));
switch (nid) {
case NID_X9_62_prime256v1:
return 256;
case NID_secp384r1:
return 384;
case NID_secp521r1:
return 521;
}
}
case KEY_ED25519:
return 32;
}
return 0;
}
static RSA *
rsa_generate_private_key(u_int bits)
{
RSA *private;
private = RSA_generate_key(bits, 35, NULL, NULL);
if (private == NULL)
pamsshagentauth_fatal("rsa_generate_private_key: key generation failed.");
return private;
}
static DSA*
dsa_generate_private_key(u_int bits)
{
DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
if (private == NULL)
pamsshagentauth_fatal("dsa_generate_private_key: DSA_generate_parameters failed");
if (!DSA_generate_key(private))
pamsshagentauth_fatal("dsa_generate_private_key: DSA_generate_key failed.");
if (private == NULL)
pamsshagentauth_fatal("dsa_generate_private_key: NULL.");
return private;
}
static EC_KEY*
ecdsa_generate_private_key(u_int bits)
{
pamsshagentauth_fatal("ecdsa_generate_private_key: implement me");
return NULL;
}
static ED25519*
ed25519_generate_private_key()
{
ED25519 *k = (ED25519*)pamsshagentauth_xcalloc(1, sizeof(ED25519));
RAND_bytes(k->sk, sizeof(k->sk));
return k;
}
Key *
pamsshagentauth_key_generate(int type, u_int bits)
{
Key *k = pamsshagentauth_key_new(KEY_UNSPEC);
switch (type) {
case KEY_DSA:
k->dsa = dsa_generate_private_key(bits);
break;
case KEY_RSA:
case KEY_RSA1:
k->rsa = rsa_generate_private_key(bits);
break;
case KEY_ECDSA:
k->ecdsa = ecdsa_generate_private_key(bits);
break;
case KEY_ED25519:
k->ed25519 = ed25519_generate_private_key();
break;
default:
pamsshagentauth_fatal("key_generate: unknown type %d", type);
}
k->type = type;
return k;
}
Key *
pamsshagentauth_key_from_private(const Key *k)
{
Key *n = NULL;
switch (k->type) {
case KEY_DSA:
n = pamsshagentauth_key_new(k->type);
if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
(BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
(BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
(BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL))
pamsshagentauth_fatal("key_from_private: BN_copy failed");
break;
case KEY_RSA:
case KEY_RSA1:
n = pamsshagentauth_key_new(k->type);
if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
(BN_copy(n->rsa->e, k->rsa->e) == NULL))
pamsshagentauth_fatal("key_from_private: BN_copy failed");
break;
case KEY_ECDSA:
n = pamsshagentauth_key_new(k->type);
if (EC_KEY_copy(n->ecdsa, k->ecdsa) == NULL)
pamsshagentauth_fatal("key_from_private: EC_KEY_copy failed");
break;
case KEY_ED25519:
n = pamsshagentauth_key_new(k->type);
memcpy(n->ed25519, k->ed25519, sizeof(ED25519));
break;
default:
pamsshagentauth_fatal("key_from_private: unknown type %d", k->type);
break;
}
return n;
}
int
pamsshagentauth_key_type_from_name(char *name)
{
if (strcmp(name, "rsa1") == 0) {
return KEY_RSA1;
} else if (strcmp(name, "rsa") == 0) {
return KEY_RSA;
} else if (strcmp(name, "dsa") == 0) {
return KEY_DSA;
} else if (strcmp(name, "ssh-rsa") == 0) {
return KEY_RSA;
} else if (strcmp(name, "ssh-dss") == 0) {
return KEY_DSA;
} else if (strncmp(name, "ecdsa-sha2", 10) == 0) {
return KEY_ECDSA;
} else if (strcmp(name, "ssh-ed25519") == 0) {
return KEY_ED25519;
}
pamsshagentauth_verbose("key_type_from_name: unknown key type '%s'", name);
return KEY_UNSPEC;
}
int
pamsshagentauth_ec_group_from_name(char *name)
{
// if we get "ecdsa-sha2-" advance past the ecdsa-sha2- bit
if (strlen(name) > 11)
name += 11;
if (strcmp(name, "nistp256") == 0) {
return NID_X9_62_prime256v1;
} else if (strcmp(name, "nistp384") == 0) {
return NID_secp384r1;
} else if (strcmp(name, "nistp521") == 0) {
return NID_secp521r1;
}
return -1;
}
int
pamsshagentauth_key_names_valid2(const char *names)
{
char *s, *cp, *p;
if (names == NULL || strcmp(names, "") == 0)
return 0;
s = cp = pamsshagentauth_xstrdup(names);
for ((p = strsep(&cp, ",")); p && *p != '\0';
(p = strsep(&cp, ","))) {
switch (pamsshagentauth_key_type_from_name(p)) {
case KEY_RSA1:
case KEY_UNSPEC:
pamsshagentauth_xfree(s);
return 0;
}
}
pamsshagentauth_verbose("key names ok: [%s]", names);
pamsshagentauth_xfree(s);
return 1;
}
Key *
pamsshagentauth_key_from_blob(const u_char *blob, u_int blen)
{
Buffer b;
int rlen, type;
char *ktype = NULL;
Key *key = NULL;
#ifdef DEBUG_PK
pamsshagentauth_dump_base64(stderr, blob, blen);
#endif
pamsshagentauth_buffer_init(&b);
pamsshagentauth_buffer_append(&b, blob, blen);
if ((ktype = pamsshagentauth_buffer_get_string_ret(&b, NULL)) == NULL) {
pamsshagentauth_logerror("key_from_blob: can't read key type");
goto out;
}
type = pamsshagentauth_key_type_from_name(ktype);
switch (type) {
case KEY_RSA:
key = pamsshagentauth_key_new(type);
if (pamsshagentauth_buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
pamsshagentauth_buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
pamsshagentauth_logerror("key_from_blob: can't read rsa key");
pamsshagentauth_key_free(key);
key = NULL;
goto out;
}
#ifdef DEBUG_PK
RSA_print_fp(stderr, key->rsa, 8);
#endif
break;
case KEY_DSA:
key = pamsshagentauth_key_new(type);
if (pamsshagentauth_buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
pamsshagentauth_buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
pamsshagentauth_buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
pamsshagentauth_buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
pamsshagentauth_logerror("key_from_blob: can't read dsa key");
pamsshagentauth_key_free(key);
key = NULL;
goto out;
}
#ifdef DEBUG_PK
DSA_print_fp(stderr, key->dsa, 8);
#endif
break;
case KEY_ECDSA:
{
// RFC 5656
EC_KEY *ecdsa = NULL;
EC_POINT *p = NULL;
char *identifier = NULL;
u_int len = 0;
void *octets = NULL;
identifier = pamsshagentauth_buffer_get_string_ret(&b, NULL);
key = pamsshagentauth_key_new(type);
if ((ecdsa = EC_KEY_new_by_curve_name(pamsshagentauth_ec_group_from_name(identifier))) == NULL) {
pamsshagentauth_logerror("key_from_blob: can't create EC KEY");
pamsshagentauth_key_free(key);
key = NULL;
goto out;
}
key->ecdsa = ecdsa;
if ((octets = pamsshagentauth_buffer_get_string_ret(&b, &len)) == NULL || len == 0) {
pamsshagentauth_logerror("key_from_blob: can't get octets from buffer");
pamsshagentauth_key_free(key);
key = NULL;
goto out;
}
if ((p = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
pamsshagentauth_logerror("key_from_blob: can't create EC POINT");
pamsshagentauth_xfree(octets);
pamsshagentauth_key_free(key);
key = NULL;
goto out;
}
if (EC_POINT_oct2point(EC_KEY_get0_group(key->ecdsa), p, octets, len, NULL) == -1) {
pamsshagentauth_logerror("key_from_blob: can't read ecdsa key");
EC_POINT_free(p);
pamsshagentauth_xfree(octets);
pamsshagentauth_key_free(key);
key = NULL;
goto out;
}
EC_KEY_set_public_key(key->ecdsa, p);
EC_POINT_free(p);
if (!EC_KEY_check_key(key->ecdsa)) {
pamsshagentauth_logerror("key_from_blob: ecdsa key invalid");
pamsshagentauth_key_free(key);
key = NULL;
goto out;
}
#ifdef DEBUG_PK
EC_KEY_print_fp(stderr, key->ecdsa, 8);
#endif
break;
}
case KEY_ED25519:
{
u_int len = 0;
key = pamsshagentauth_key_new(type);
void *kbits = pamsshagentauth_buffer_get_string_ret(&b, &len);
if (len != pamsshagentauth_key_size(key)) {
pamsshagentauth_logerror("key_from_blob: ed25519 key invalid (%u bytes read)",
len);
pamsshagentauth_xfree(kbits);
pamsshagentauth_key_free(key);
key = NULL;
goto out;
}
memcpy(key->ed25519->pk, kbits, sizeof(key->ed25519->pk));
pamsshagentauth_xfree(kbits);
#ifdef DEBUG_PK
pamsshagentauth_dump_base64(stderr, (u_char*)key->ed25519,
sizeof(key->ed25519));
#endif
break;
}
case KEY_UNSPEC:
key = pamsshagentauth_key_new(type);
break;
default:
pamsshagentauth_logerror("key_from_blob: cannot handle type %s", ktype);
goto out;
}
rlen = pamsshagentauth_buffer_len(&b);
if (key != NULL && rlen != 0)
pamsshagentauth_logerror("key_from_blob: remaining bytes in key blob %d", rlen);
out: