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key.c
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/* $OpenBSD: key.c,v 1.95 2010/11/10 01:33:07 djm Exp $ */
/*
* read_bignum():
* Copyright (c) 1995 Tatu Ylonen <[email protected]>, 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.
* Copyright (c) 2008 Alexander von Gernler. 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.
*/
#include "includes.h"
#include <sys/param.h>
#include <sys/types.h>
#include <openssl/evp.h>
#include <openbsd-compat/openssl-compat.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"
#include "misc.h"
#include "ssh2.h"
static struct KeyCert *
cert_new(void)
{
struct KeyCert *cert;
cert = xcalloc(1, sizeof(*cert));
buffer_init(&cert->certblob);
buffer_init(&cert->critical);
buffer_init(&cert->extensions);
cert->key_id = NULL;
cert->principals = NULL;
cert->signature_key = NULL;
return cert;
}
Key *
key_new(int type)
{
Key *k;
RSA *rsa;
DSA *dsa;
k = xcalloc(1, sizeof(*k));
k->type = type;
k->ecdsa = NULL;
k->ecdsa_nid = -1;
k->dsa = NULL;
k->rsa = NULL;
k->cert = NULL;
switch (k->type) {
case KEY_RSA1:
case KEY_RSA:
case KEY_RSA_CERT_V00:
case KEY_RSA_CERT:
if ((rsa = RSA_new()) == NULL)
fatal("key_new: RSA_new failed");
if ((rsa->n = BN_new()) == NULL)
fatal("key_new: BN_new failed");
if ((rsa->e = BN_new()) == NULL)
fatal("key_new: BN_new failed");
k->rsa = rsa;
break;
case KEY_DSA:
case KEY_DSA_CERT_V00:
case KEY_DSA_CERT:
if ((dsa = DSA_new()) == NULL)
fatal("key_new: DSA_new failed");
if ((dsa->p = BN_new()) == NULL)
fatal("key_new: BN_new failed");
if ((dsa->q = BN_new()) == NULL)
fatal("key_new: BN_new failed");
if ((dsa->g = BN_new()) == NULL)
fatal("key_new: BN_new failed");
if ((dsa->pub_key = BN_new()) == NULL)
fatal("key_new: BN_new failed");
k->dsa = dsa;
break;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
case KEY_ECDSA_CERT:
/* Cannot do anything until we know the group */
break;
#endif
case KEY_UNSPEC:
break;
default:
fatal("key_new: bad key type %d", k->type);
break;
}
if (key_is_cert(k))
k->cert = cert_new();
return k;
}
void
key_add_private(Key *k)
{
switch (k->type) {
case KEY_RSA1:
case KEY_RSA:
case KEY_RSA_CERT_V00:
case KEY_RSA_CERT:
if ((k->rsa->d = BN_new()) == NULL)
fatal("key_new_private: BN_new failed");
if ((k->rsa->iqmp = BN_new()) == NULL)
fatal("key_new_private: BN_new failed");
if ((k->rsa->q = BN_new()) == NULL)
fatal("key_new_private: BN_new failed");
if ((k->rsa->p = BN_new()) == NULL)
fatal("key_new_private: BN_new failed");
if ((k->rsa->dmq1 = BN_new()) == NULL)
fatal("key_new_private: BN_new failed");
if ((k->rsa->dmp1 = BN_new()) == NULL)
fatal("key_new_private: BN_new failed");
break;
case KEY_DSA:
case KEY_DSA_CERT_V00:
case KEY_DSA_CERT:
if ((k->dsa->priv_key = BN_new()) == NULL)
fatal("key_new_private: BN_new failed");
break;
case KEY_ECDSA:
case KEY_ECDSA_CERT:
/* Cannot do anything until we know the group */
break;
case KEY_UNSPEC:
break;
default:
break;
}
}
Key *
key_new_private(int type)
{
Key *k = key_new(type);
key_add_private(k);
return k;
}
static void
cert_free(struct KeyCert *cert)
{
u_int i;
buffer_free(&cert->certblob);
buffer_free(&cert->critical);
buffer_free(&cert->extensions);
if (cert->key_id != NULL)
xfree(cert->key_id);
for (i = 0; i < cert->nprincipals; i++)
xfree(cert->principals[i]);
if (cert->principals != NULL)
xfree(cert->principals);
if (cert->signature_key != NULL)
key_free(cert->signature_key);
}
void
key_free(Key *k)
{
if (k == NULL)
fatal("key_free: key is NULL");
switch (k->type) {
case KEY_RSA1:
case KEY_RSA:
case KEY_RSA_CERT_V00:
case KEY_RSA_CERT:
if (k->rsa != NULL)
RSA_free(k->rsa);
k->rsa = NULL;
break;
case KEY_DSA:
case KEY_DSA_CERT_V00:
case KEY_DSA_CERT:
if (k->dsa != NULL)
DSA_free(k->dsa);
k->dsa = NULL;
break;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
case KEY_ECDSA_CERT:
if (k->ecdsa != NULL)
EC_KEY_free(k->ecdsa);
k->ecdsa = NULL;
break;
#endif
case KEY_UNSPEC:
break;
default:
fatal("key_free: bad key type %d", k->type);
break;
}
if (key_is_cert(k)) {
if (k->cert != NULL)
cert_free(k->cert);
k->cert = NULL;
}
xfree(k);
}
static int
cert_compare(struct KeyCert *a, struct KeyCert *b)
{
if (a == NULL && b == NULL)
return 1;
if (a == NULL || b == NULL)
return 0;
if (buffer_len(&a->certblob) != buffer_len(&b->certblob))
return 0;
if (timingsafe_bcmp(buffer_ptr(&a->certblob), buffer_ptr(&b->certblob),
buffer_len(&a->certblob)) != 0)
return 0;
return 1;
}
/*
* Compare public portions of key only, allowing comparisons between
* certificates and plain keys too.
*/
int
key_equal_public(const Key *a, const Key *b)
{
#ifdef OPENSSL_HAS_ECC
BN_CTX *bnctx;
#endif
if (a == NULL || b == NULL ||
key_type_plain(a->type) != key_type_plain(b->type))
return 0;
switch (a->type) {
case KEY_RSA1:
case KEY_RSA_CERT_V00:
case KEY_RSA_CERT:
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_CERT_V00:
case KEY_DSA_CERT:
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;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA_CERT:
case KEY_ECDSA:
if (a->ecdsa == NULL || b->ecdsa == NULL ||
EC_KEY_get0_public_key(a->ecdsa) == NULL ||
EC_KEY_get0_public_key(b->ecdsa) == NULL)
return 0;
if ((bnctx = BN_CTX_new()) == NULL)
fatal("%s: BN_CTX_new failed", __func__);
if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
EC_KEY_get0_public_key(a->ecdsa),
EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
BN_CTX_free(bnctx);
return 0;
}
BN_CTX_free(bnctx);
return 1;
#endif /* OPENSSL_HAS_ECC */
default:
fatal("key_equal: bad key type %d", a->type);
}
/* NOTREACHED */
}
int
key_equal(const Key *a, const Key *b)
{
if (a == NULL || b == NULL || a->type != b->type)
return 0;
if (key_is_cert(a)) {
if (!cert_compare(a->cert, b->cert))
return 0;
}
return key_equal_public(a, b);
}
u_char*
key_fingerprint_raw(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, otype;
*dgst_raw_length = 0;
switch (dgst_type) {
case SSH_FP_MD5:
md = EVP_md5();
break;
case SSH_FP_SHA1:
md = EVP_sha1();
break;
default:
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 = xmalloc(len);
BN_bn2bin(k->rsa->n, blob);
BN_bn2bin(k->rsa->e, blob + nlen);
break;
case KEY_DSA:
case KEY_ECDSA:
case KEY_RSA:
key_to_blob(k, &blob, &len);
break;
case KEY_DSA_CERT_V00:
case KEY_RSA_CERT_V00:
case KEY_DSA_CERT:
case KEY_ECDSA_CERT:
case KEY_RSA_CERT:
/* We want a fingerprint of the _key_ not of the cert */
otype = k->type;
k->type = key_type_plain(k->type);
key_to_blob(k, &blob, &len);
k->type = otype;
break;
case KEY_UNSPEC:
return retval;
default:
fatal("key_fingerprint_raw: bad key type %d", k->type);
break;
}
if (blob != NULL) {
retval = 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);
xfree(blob);
} else {
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 = 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]);
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 = 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;
}
/*
* Draw an ASCII-Art representing the fingerprint so human brain can
* profit from its built-in pattern recognition ability.
* This technique is called "random art" and can be found in some
* scientific publications like this original paper:
*
* "Hash Visualization: a New Technique to improve Real-World Security",
* Perrig A. and Song D., 1999, International Workshop on Cryptographic
* Techniques and E-Commerce (CrypTEC '99)
* sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
*
* The subject came up in a talk by Dan Kaminsky, too.
*
* If you see the picture is different, the key is different.
* If the picture looks the same, you still know nothing.
*
* The algorithm used here is a worm crawling over a discrete plane,
* leaving a trace (augmenting the field) everywhere it goes.
* Movement is taken from dgst_raw 2bit-wise. Bumping into walls
* makes the respective movement vector be ignored for this turn.
* Graphs are not unambiguous, because circles in graphs can be
* walked in either direction.
*/
/*
* Field sizes for the random art. Have to be odd, so the starting point
* can be in the exact middle of the picture, and FLDBASE should be >=8 .
* Else pictures would be too dense, and drawing the frame would
* fail, too, because the key type would not fit in anymore.
*/
#define FLDBASE 8
#define FLDSIZE_Y (FLDBASE + 1)
#define FLDSIZE_X (FLDBASE * 2 + 1)
static char *
key_fingerprint_randomart(u_char *dgst_raw, u_int dgst_raw_len, const Key *k)
{
/*
* Chars to be used after each other every time the worm
* intersects with itself. Matter of taste.
*/
char *augmentation_string = " .o+=*BOX@%&#/^SE";
char *retval, *p;
u_char field[FLDSIZE_X][FLDSIZE_Y];
u_int i, b;
int x, y;
size_t len = strlen(augmentation_string) - 1;
retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2));
/* initialize field */
memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
x = FLDSIZE_X / 2;
y = FLDSIZE_Y / 2;
/* process raw key */
for (i = 0; i < dgst_raw_len; i++) {
int input;
/* each byte conveys four 2-bit move commands */
input = dgst_raw[i];
for (b = 0; b < 4; b++) {
/* evaluate 2 bit, rest is shifted later */
x += (input & 0x1) ? 1 : -1;
y += (input & 0x2) ? 1 : -1;
/* assure we are still in bounds */
x = MAX(x, 0);
y = MAX(y, 0);
x = MIN(x, FLDSIZE_X - 1);
y = MIN(y, FLDSIZE_Y - 1);
/* augment the field */
if (field[x][y] < len - 2)
field[x][y]++;
input = input >> 2;
}
}
/* mark starting point and end point*/
field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
field[x][y] = len;
/* fill in retval */
snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type(k), key_size(k));
p = strchr(retval, '\0');
/* output upper border */
for (i = p - retval - 1; i < FLDSIZE_X; i++)
*p++ = '-';
*p++ = '+';
*p++ = '\n';
/* output content */
for (y = 0; y < FLDSIZE_Y; y++) {
*p++ = '|';
for (x = 0; x < FLDSIZE_X; x++)
*p++ = augmentation_string[MIN(field[x][y], len)];
*p++ = '|';
*p++ = '\n';
}
/* output lower border */
*p++ = '+';
for (i = 0; i < FLDSIZE_X; i++)
*p++ = '-';
*p++ = '+';
return retval;
}
char *
key_fingerprint(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 = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
if (!dgst_raw)
fatal("key_fingerprint: null from 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;
case SSH_FP_RANDOMART:
retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len, k);
break;
default:
fatal("key_fingerprint: bad digest representation %d",
dgst_rep);
break;
}
memset(dgst_raw, 0, dgst_raw_len);
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) {
error("write_bignum: BN_bn2dec() failed");
return 0;
}
fprintf(f, " %s", buf);
OPENSSL_free(buf);
return 1;
}
/* returns 1 ok, -1 error */
int
key_read(Key *ret, char **cpp)
{
Key *k;
int success = -1;
char *cp, *space;
int len, n, type;
u_int bits;
u_char *blob;
#ifdef OPENSSL_HAS_ECC
int curve_nid = -1;
#endif
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;
/* validate the claimed number of bits */
if ((u_int)BN_num_bits(ret->rsa->n) != bits) {
verbose("key_read: claimed key size %d does not match "
"actual %d", bits, BN_num_bits(ret->rsa->n));
return -1;
}
success = 1;
break;
case KEY_UNSPEC:
case KEY_RSA:
case KEY_DSA:
case KEY_ECDSA:
case KEY_DSA_CERT_V00:
case KEY_RSA_CERT_V00:
case KEY_DSA_CERT:
case KEY_ECDSA_CERT:
case KEY_RSA_CERT:
space = strchr(cp, ' ');
if (space == NULL) {
debug3("key_read: missing whitespace");
return -1;
}
*space = '\0';
type = key_type_from_name(cp);
#ifdef OPENSSL_HAS_ECC
if (key_type_plain(type) == KEY_ECDSA &&
(curve_nid = key_ecdsa_nid_from_name(cp)) == -1) {
debug("key_read: invalid curve");
return -1;
}
#endif
*space = ' ';
if (type == KEY_UNSPEC) {
debug3("key_read: missing keytype");
return -1;
}
cp = space+1;
if (*cp == '\0') {
debug3("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 */
debug3("key_read: type mismatch");
return -1;
}
len = 2*strlen(cp);
blob = xmalloc(len);
n = uudecode(cp, blob, len);
if (n < 0) {
error("key_read: uudecode %s failed", cp);
xfree(blob);
return -1;
}
k = key_from_blob(blob, (u_int)n);
xfree(blob);
if (k == NULL) {
error("key_read: key_from_blob %s failed", cp);
return -1;
}
if (k->type != type) {
error("key_read: type mismatch: encoding error");
key_free(k);
return -1;
}
#ifdef OPENSSL_HAS_ECC
if (key_type_plain(type) == KEY_ECDSA &&
curve_nid != k->ecdsa_nid) {
error("key_read: type mismatch: EC curve mismatch");
key_free(k);
return -1;
}
#endif
/*XXXX*/
if (key_is_cert(ret)) {
if (!key_is_cert(k)) {
error("key_read: loaded key is not a cert");
key_free(k);
return -1;
}
if (ret->cert != NULL)
cert_free(ret->cert);
ret->cert = k->cert;
k->cert = NULL;
}
if (key_type_plain(ret->type) == KEY_RSA) {
if (ret->rsa != NULL)
RSA_free(ret->rsa);
ret->rsa = k->rsa;
k->rsa = NULL;
#ifdef DEBUG_PK
RSA_print_fp(stderr, ret->rsa, 8);
#endif
}
if (key_type_plain(ret->type) == KEY_DSA) {
if (ret->dsa != NULL)
DSA_free(ret->dsa);
ret->dsa = k->dsa;
k->dsa = NULL;
#ifdef DEBUG_PK
DSA_print_fp(stderr, ret->dsa, 8);
#endif
}
#ifdef OPENSSL_HAS_ECC
if (key_type_plain(ret->type) == KEY_ECDSA) {
if (ret->ecdsa != NULL)
EC_KEY_free(ret->ecdsa);
ret->ecdsa = k->ecdsa;
ret->ecdsa_nid = k->ecdsa_nid;
k->ecdsa = NULL;
k->ecdsa_nid = -1;
#ifdef DEBUG_PK
key_dump_ec_key(ret->ecdsa);
#endif
}
#endif
success = 1;
/*XXXX*/
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:
fatal("key_read: bad key type: %d", ret->type);
break;
}
return success;
}
int
key_write(const Key *key, FILE *f)
{
int n, success = 0;
u_int len, bits = 0;
u_char *blob;
char *uu;
if (key_is_cert(key)) {
if (key->cert == NULL) {
error("%s: no cert data", __func__);
return 0;
}
if (buffer_len(&key->cert->certblob) == 0) {
error("%s: no signed certificate blob", __func__);
return 0;
}
}
switch (key->type) {
case KEY_RSA1:
if (key->rsa == NULL)
return 0;
/* 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))
return 1;
error("key_write: failed for RSA key");
return 0;
case KEY_DSA:
case KEY_DSA_CERT_V00:
case KEY_DSA_CERT:
if (key->dsa == NULL)
return 0;
break;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
case KEY_ECDSA_CERT:
if (key->ecdsa == NULL)
return 0;
break;
#endif
case KEY_RSA:
case KEY_RSA_CERT_V00:
case KEY_RSA_CERT:
if (key->rsa == NULL)
return 0;
break;
default:
return 0;
}
key_to_blob(key, &blob, &len);
uu = xmalloc(2*len);
n = uuencode(blob, len, uu, 2*len);
if (n > 0) {
fprintf(f, "%s %s", key_ssh_name(key), uu);
success = 1;
}
xfree(blob);
xfree(uu);
return success;
}
const char *
key_type(const Key *k)
{
switch (k->type) {
case KEY_RSA1:
return "RSA1";
case KEY_RSA:
return "RSA";
case KEY_DSA:
return "DSA";
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
return "ECDSA";
#endif
case KEY_RSA_CERT_V00:
return "RSA-CERT-V00";
case KEY_DSA_CERT_V00:
return "DSA-CERT-V00";
case KEY_RSA_CERT:
return "RSA-CERT";
case KEY_DSA_CERT:
return "DSA-CERT";
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA_CERT:
return "ECDSA-CERT";
#endif
}
return "unknown";
}
const char *
key_cert_type(const Key *k)
{
switch (k->cert->type) {
case SSH2_CERT_TYPE_USER:
return "user";
case SSH2_CERT_TYPE_HOST:
return "host";
default:
return "unknown";
}
}
static const char *
key_ssh_name_from_type_nid(int type, int nid)
{
switch (type) {
case KEY_RSA:
return "ssh-rsa";
case KEY_DSA:
return "ssh-dss";
case KEY_RSA_CERT_V00:
return "[email protected]";
case KEY_DSA_CERT_V00:
return "[email protected]";
case KEY_RSA_CERT:
return "[email protected]";
case KEY_DSA_CERT:
return "[email protected]";
#ifdef OPENSSL_HAS_ECC
case KEY_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";
default:
break;
}
break;
case KEY_ECDSA_CERT:
switch (nid) {
case NID_X9_62_prime256v1:
return "[email protected]";
case NID_secp384r1:
return "[email protected]";
case NID_secp521r1:
return "[email protected]";
default:
break;
}
break;
#endif /* OPENSSL_HAS_ECC */
case KEY_NULL:
return "null";
}
return "ssh-unknown";
}
const char *
key_ssh_name(const Key *k)
{
return key_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
}
const char *
key_ssh_name_plain(const Key *k)
{
return key_ssh_name_from_type_nid(key_type_plain(k->type),
k->ecdsa_nid);
}
u_int
key_size(const Key *k)
{
switch (k->type) {
case KEY_RSA1:
case KEY_RSA:
case KEY_RSA_CERT_V00:
case KEY_RSA_CERT: