/*
+ * 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 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by Markus Friedl.
- * 4. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-/*
- * read_bignum():
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- */
#include "includes.h"
#include "ssh.h"
#include <openssl/evp.h>
#include "xmalloc.h"
#include "key.h"
-#include "dsa.h"
+#include "rsa.h"
+#include "ssh-dss.h"
+#include "ssh-rsa.h"
#include "uuencode.h"
+#include "buffer.h"
+#include "bufaux.h"
-#define SSH_DSS "ssh-dss"
+RCSID("$OpenBSD: key.c,v 1.14 2001/01/16 19:20:06 markus Exp $");
Key *
key_new(int type)
k->dsa = NULL;
k->rsa = NULL;
switch (k->type) {
+ case KEY_RSA1:
case KEY_RSA:
rsa = RSA_new();
rsa->n = BN_new();
dsa->pub_key = BN_new();
k->dsa = dsa;
break;
- case KEY_EMPTY:
+ case KEY_UNSPEC:
break;
default:
fatal("key_new: bad key type %d", k->type);
}
return k;
}
+Key *
+key_new_private(int type)
+{
+ Key *k = key_new(type);
+ switch (k->type) {
+ case KEY_RSA1:
+ case KEY_RSA:
+ k->rsa->d = BN_new();
+ k->rsa->iqmp = BN_new();
+ k->rsa->q = BN_new();
+ k->rsa->p = BN_new();
+ k->rsa->dmq1 = BN_new();
+ k->rsa->dmp1 = BN_new();
+ break;
+ case KEY_DSA:
+ k->dsa->priv_key = BN_new();
+ break;
+ case KEY_UNSPEC:
+ break;
+ default:
+ break;
+ }
+ return k;
+}
void
key_free(Key *k)
{
switch (k->type) {
+ case KEY_RSA1:
case KEY_RSA:
if (k->rsa != NULL)
RSA_free(k->rsa);
DSA_free(k->dsa);
k->dsa = NULL;
break;
+ case KEY_UNSPEC:
+ break;
default:
fatal("key_free: bad key type %d", k->type);
break;
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 &&
return 0;
}
-#define FPRINT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
-
/*
* Generate key fingerprint in ascii format.
* Based on ideas and code from Bjoern Groenvall <bg@sics.se>
char *
key_fingerprint(Key *k)
{
- static char retval[80];
- unsigned char *blob = NULL;
+ static char retval[(EVP_MAX_MD_SIZE+1)*3];
+ u_char *blob = NULL;
int len = 0;
int nlen, elen;
+ retval[0] = '\0';
switch (k->type) {
- case KEY_RSA:
+ case KEY_RSA1:
nlen = BN_num_bytes(k->rsa->n);
elen = BN_num_bytes(k->rsa->e);
len = nlen + elen;
BN_bn2bin(k->rsa->e, blob + nlen);
break;
case KEY_DSA:
- dsa_make_key_blob(k, &blob, &len);
+ case KEY_RSA:
+ key_to_blob(k, &blob, &len);
+ break;
+ case KEY_UNSPEC:
+ return retval;
break;
default:
fatal("key_fingerprint: bad key type %d", k->type);
break;
}
if (blob != NULL) {
- unsigned char d[16];
- EVP_MD_CTX md;
- EVP_DigestInit(&md, EVP_md5());
- EVP_DigestUpdate(&md, blob, len);
- EVP_DigestFinal(&md, d, NULL);
- snprintf(retval, sizeof(retval), FPRINT,
- d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
- d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
+ int i;
+ u_char digest[EVP_MAX_MD_SIZE];
+ EVP_MD *md = EVP_md5();
+ EVP_MD_CTX ctx;
+ EVP_DigestInit(&ctx, md);
+ EVP_DigestUpdate(&ctx, blob, len);
+ EVP_DigestFinal(&ctx, digest, NULL);
+ for(i = 0; i < md->md_size; i++) {
+ char hex[4];
+ snprintf(hex, sizeof(hex), "%02x:", digest[i]);
+ strlcat(retval, hex, sizeof(retval));
+ }
+ retval[strlen(retval) - 1] = '\0';
memset(blob, 0, len);
xfree(blob);
}
free(buf);
return 1;
}
-unsigned int
+
+/* returns 1 ok, -1 error, 0 type mismatch */
+int
key_read(Key *ret, char **cpp)
{
Key *k;
- unsigned int bits = 0;
- char *cp;
- int len, n;
- unsigned char *blob;
+ int success = -1;
+ char *cp, *space;
+ int len, n, type;
+ u_int bits;
+ u_char *blob;
cp = *cpp;
switch(ret->type) {
- case KEY_RSA:
+ case KEY_RSA1:
/* Get number of bits. */
if (*cp < '0' || *cp > '9')
- return 0; /* Bad bit count... */
+ return -1; /* Bad bit count... */
for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
bits = 10 * bits + *cp - '0';
if (bits == 0)
- return 0;
+ return -1;
*cpp = cp;
/* Get public exponent, public modulus. */
if (!read_bignum(cpp, ret->rsa->e))
- return 0;
+ return -1;
if (!read_bignum(cpp, ret->rsa->n))
- return 0;
+ return -1;
+ success = 1;
break;
+ case KEY_UNSPEC:
+ case KEY_RSA:
case KEY_DSA:
- if (strncmp(cp, SSH_DSS " ", 7) != 0)
+ space = strchr(cp, ' ');
+ if (space == NULL) {
+ debug3("key_read: no space");
+ return -1;
+ }
+ *space = '\0';
+ type = key_type_from_name(cp);
+ *space = ' ';
+ if (type == KEY_UNSPEC) {
+ debug3("key_read: no key found");
+ 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 0;
- cp += 7;
+ }
len = 2*strlen(cp);
blob = xmalloc(len);
n = uudecode(cp, blob, len);
if (n < 0) {
error("key_read: uudecode %s failed", cp);
- return 0;
+ return -1;
}
- k = dsa_key_from_blob(blob, n);
+ k = key_from_blob(blob, n);
if (k == NULL) {
- error("key_read: dsa_key_from_blob %s failed", cp);
- return 0;
+ error("key_read: key_from_blob %s failed", cp);
+ return -1;
}
xfree(blob);
- if (ret->dsa != NULL)
- DSA_free(ret->dsa);
- ret->dsa = k->dsa;
- k->dsa = NULL;
+ if (k->type != type) {
+ error("key_read: type mismatch: encoding error");
+ key_free(k);
+ return -1;
+ }
+/*XXXX*/
+ if (ret->type == 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
+ } else {
+ 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
+ }
+/*XXXX*/
+ if (success != 1)
+ break;
key_free(k);
- bits = BN_num_bits(ret->dsa->p);
/* advance cp: skip whitespace and data */
while (*cp == ' ' || *cp == '\t')
cp++;
fatal("key_read: bad key type: %d", ret->type);
break;
}
- return bits;
+ return success;
}
int
key_write(Key *key, FILE *f)
{
int success = 0;
- unsigned int bits = 0;
+ u_int bits = 0;
- if (key->type == KEY_RSA && key->rsa != NULL) {
+ if (key->type == KEY_RSA1 && key->rsa != NULL) {
/* size of modulus 'n' */
bits = BN_num_bits(key->rsa->n);
fprintf(f, "%u", bits);
} else {
error("key_write: failed for RSA key");
}
- } else if (key->type == KEY_DSA && key->dsa != NULL) {
+ } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
+ (key->type == KEY_RSA && key->rsa != NULL)) {
int len, n;
- unsigned char *blob, *uu;
- dsa_make_key_blob(key, &blob, &len);
+ u_char *blob, *uu;
+ key_to_blob(key, &blob, &len);
uu = xmalloc(2*len);
n = uuencode(blob, len, uu, 2*len);
if (n > 0) {
- fprintf(f, "%s %s", SSH_DSS, uu);
+ fprintf(f, "%s %s", key_ssh_name(key), uu);
success = 1;
}
xfree(blob);
key_type(Key *k)
{
switch (k->type) {
+ case KEY_RSA1:
+ return "RSA1";
+ break;
case KEY_RSA:
return "RSA";
break;
}
return "unknown";
}
+char *
+key_ssh_name(Key *k)
+{
+ switch (k->type) {
+ case KEY_RSA:
+ return "ssh-rsa";
+ break;
+ case KEY_DSA:
+ return "ssh-dss";
+ break;
+ }
+ return "ssh-unknown";
+}
+u_int
+key_size(Key *k){
+ switch (k->type) {
+ case KEY_RSA1:
+ case KEY_RSA:
+ return BN_num_bits(k->rsa->n);
+ break;
+ case KEY_DSA:
+ return BN_num_bits(k->dsa->p);
+ break;
+ }
+ return 0;
+}
+
+RSA *
+rsa_generate_private_key(u_int bits)
+{
+ RSA *private;
+ private = RSA_generate_key(bits, 35, NULL, NULL);
+ if (private == NULL)
+ fatal("rsa_generate_private_key: key generation failed.");
+ return private;
+}
+
+DSA*
+dsa_generate_private_key(u_int bits)
+{
+ DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
+ if (private == NULL)
+ fatal("dsa_generate_private_key: DSA_generate_parameters failed");
+ if (!DSA_generate_key(private))
+ fatal("dsa_generate_private_key: DSA_generate_key failed.");
+ if (private == NULL)
+ fatal("dsa_generate_private_key: NULL.");
+ return private;
+}
+
+Key *
+key_generate(int type, u_int bits)
+{
+ Key *k = 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;
+ default:
+ fatal("key_generate: unknown type %d", type);
+ }
+ k->type = type;
+ return k;
+}
+
+Key *
+key_from_private(Key *k)
+{
+ Key *n = NULL;
+ switch (k->type) {
+ case KEY_DSA:
+ n = key_new(k->type);
+ BN_copy(n->dsa->p, k->dsa->p);
+ BN_copy(n->dsa->q, k->dsa->q);
+ BN_copy(n->dsa->g, k->dsa->g);
+ BN_copy(n->dsa->pub_key, k->dsa->pub_key);
+ break;
+ case KEY_RSA:
+ case KEY_RSA1:
+ n = key_new(k->type);
+ BN_copy(n->rsa->n, k->rsa->n);
+ BN_copy(n->rsa->e, k->rsa->e);
+ break;
+ default:
+ fatal("key_from_private: unknown type %d", k->type);
+ break;
+ }
+ return n;
+}
+
+int
+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;
+ }
+ debug("key_type_from_name: unknown key type '%s'", name);
+ return KEY_UNSPEC;
+}
+
+Key *
+key_from_blob(char *blob, int blen)
+{
+ Buffer b;
+ char *ktype;
+ int rlen, type;
+ Key *key = NULL;
+
+#ifdef DEBUG_PK
+ dump_base64(stderr, blob, blen);
+#endif
+ buffer_init(&b);
+ buffer_append(&b, blob, blen);
+ ktype = buffer_get_string(&b, NULL);
+ type = key_type_from_name(ktype);
+
+ switch(type){
+ case KEY_RSA:
+ key = key_new(type);
+ buffer_get_bignum2(&b, key->rsa->e);
+ buffer_get_bignum2(&b, key->rsa->n);
+#ifdef DEBUG_PK
+ RSA_print_fp(stderr, key->rsa, 8);
+#endif
+ break;
+ case KEY_DSA:
+ key = key_new(type);
+ buffer_get_bignum2(&b, key->dsa->p);
+ buffer_get_bignum2(&b, key->dsa->q);
+ buffer_get_bignum2(&b, key->dsa->g);
+ buffer_get_bignum2(&b, key->dsa->pub_key);
+#ifdef DEBUG_PK
+ DSA_print_fp(stderr, key->dsa, 8);
+#endif
+ break;
+ case KEY_UNSPEC:
+ key = key_new(type);
+ break;
+ default:
+ error("key_from_blob: cannot handle type %s", ktype);
+ break;
+ }
+ rlen = buffer_len(&b);
+ if (key != NULL && rlen != 0)
+ error("key_from_blob: remaining bytes in key blob %d", rlen);
+ xfree(ktype);
+ buffer_free(&b);
+ return key;
+}
+
+int
+key_to_blob(Key *key, u_char **blobp, u_int *lenp)
+{
+ Buffer b;
+ int len;
+ u_char *buf;
+
+ if (key == NULL) {
+ error("key_to_blob: key == NULL");
+ return 0;
+ }
+ buffer_init(&b);
+ switch(key->type){
+ case KEY_DSA:
+ buffer_put_cstring(&b, key_ssh_name(key));
+ buffer_put_bignum2(&b, key->dsa->p);
+ buffer_put_bignum2(&b, key->dsa->q);
+ buffer_put_bignum2(&b, key->dsa->g);
+ buffer_put_bignum2(&b, key->dsa->pub_key);
+ break;
+ case KEY_RSA:
+ buffer_put_cstring(&b, key_ssh_name(key));
+ buffer_put_bignum2(&b, key->rsa->e);
+ buffer_put_bignum2(&b, key->rsa->n);
+ break;
+ default:
+ error("key_to_blob: illegal key type %d", key->type);
+ break;
+ }
+ len = buffer_len(&b);
+ buf = xmalloc(len);
+ memcpy(buf, buffer_ptr(&b), len);
+ memset(buffer_ptr(&b), 0, len);
+ buffer_free(&b);
+ if (lenp != NULL)
+ *lenp = len;
+ if (blobp != NULL)
+ *blobp = buf;
+ return len;
+}
+
+int
+key_sign(
+ Key *key,
+ u_char **sigp, int *lenp,
+ u_char *data, int datalen)
+{
+ switch(key->type){
+ case KEY_DSA:
+ return ssh_dss_sign(key, sigp, lenp, data, datalen);
+ break;
+ case KEY_RSA:
+ return ssh_rsa_sign(key, sigp, lenp, data, datalen);
+ break;
+ default:
+ error("key_sign: illegal key type %d", key->type);
+ return -1;
+ break;
+ }
+}
+
+int
+key_verify(
+ Key *key,
+ u_char *signature, int signaturelen,
+ u_char *data, int datalen)
+{
+ switch(key->type){
+ case KEY_DSA:
+ return ssh_dss_verify(key, signature, signaturelen, data, datalen);
+ break;
+ case KEY_RSA:
+ return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
+ break;
+ default:
+ error("key_verify: illegal key type %d", key->type);
+ return -1;
+ break;
+ }
+}
andersk / openssh.git / blobdiff