+/* $OpenBSD: key.c,v 1.82 2010/01/13 01:10:56 dtucker Exp $ */
/*
- * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ * 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.
+ * 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
* 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/rsa.h>
-#include <openssl/dsa.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"
Key *
key_new(int type)
Key *k;
RSA *rsa;
DSA *dsa;
- k = xmalloc(sizeof(*k));
+ k = xcalloc(1, sizeof(*k));
k->type = type;
+ k->dsa = NULL;
+ k->rsa = NULL;
switch (k->type) {
+ case KEY_RSA1:
case KEY_RSA:
- rsa = RSA_new();
- rsa->n = BN_new();
- rsa->e = BN_new();
+ 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:
- dsa = DSA_new();
- dsa->p = BN_new();
- dsa->q = BN_new();
- dsa->g = BN_new();
- dsa->pub_key = BN_new();
+ 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;
- case KEY_EMPTY:
- k->dsa = NULL;
- k->rsa = NULL;
+ 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:
+ 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:
+ if ((k->dsa->priv_key = BN_new()) == NULL)
+ fatal("key_new_private: BN_new failed");
+ break;
+ case KEY_UNSPEC:
+ break;
+ default:
+ break;
+ }
+ return k;
+}
+
void
key_free(Key *k)
{
+ if (k == NULL)
+ fatal("key_free: key is NULL");
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;
}
xfree(k);
}
+
int
-key_equal(Key *a, Key *b)
+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;
- break;
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;
- break;
default:
- fatal("key_free: bad key type %d", a->type);
- break;
+ fatal("key_equal: bad key type %d", a->type);
}
- return 0;
+ /* NOTREACHED */
}
-#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)
+u_char*
+key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
+ u_int *dgst_raw_length)
{
- static char retval[80];
- unsigned char *buf = NULL;
- int len = 0;
- int nlen, elen, plen, qlen, glen, publen;
+ 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:
+ fatal("key_fingerprint_raw: bad digest type %d",
+ dgst_type);
+ }
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;
- buf = xmalloc(len);
- BN_bn2bin(k->rsa->n, buf);
- BN_bn2bin(k->rsa->e, buf + nlen);
+ blob = xmalloc(len);
+ BN_bn2bin(k->rsa->n, blob);
+ BN_bn2bin(k->rsa->e, blob + nlen);
break;
case KEY_DSA:
- plen = BN_num_bytes(k->dsa->p);
- qlen = BN_num_bytes(k->dsa->q);
- glen = BN_num_bytes(k->dsa->g);
- publen = BN_num_bytes(k->dsa->pub_key);
- len = qlen + qlen + glen + publen;
- buf = xmalloc(len);
- BN_bn2bin(k->dsa->p, buf);
- BN_bn2bin(k->dsa->q, buf + plen);
- BN_bn2bin(k->dsa->g, buf + plen + qlen);
- BN_bn2bin(k->dsa->pub_key , buf + plen + qlen + glen);
+ case KEY_RSA:
+ key_to_blob(k, &blob, &len);
break;
+ case KEY_UNSPEC:
+ return retval;
default:
- fatal("key_fingerprint: bad key type %d", k->type);
+ fatal("key_fingerprint_raw: bad key type %d", k->type);
break;
}
- if (buf != NULL) {
- unsigned char d[16];
- EVP_MD_CTX md;
- EVP_DigestInit(&md, EVP_md5());
- EVP_DigestUpdate(&md, buf, 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]);
- memset(buf, 0, len);
- xfree(buf);
+ 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(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 = 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;
}
* last processed (and maybe modified) character. Note that this may modify
* the buffer containing the number.
*/
-int
+static int
read_bignum(char **cpp, BIGNUM * value)
{
char *cp = *cpp;
*cpp = cp;
return 1;
}
-int
+
+static int
write_bignum(FILE *f, BIGNUM *num)
{
char *buf = BN_bn2dec(num);
return 0;
}
fprintf(f, " %s", buf);
- free(buf);
+ OPENSSL_free(buf);
return 1;
}
+
+/* returns 1 ok, -1 error */
int
-key_read(Key *ret, unsigned int bits, char **cpp)
+key_read(Key *ret, char **cpp)
{
- switch(ret->type) {
- case KEY_RSA:
+ 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 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;
+ /* 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:
- if (bits != 0)
- return 0;
- if (!read_bignum(cpp, ret->dsa->p))
- return 0;
- if (!read_bignum(cpp, ret->dsa->q))
- return 0;
- if (!read_bignum(cpp, ret->dsa->g))
- return 0;
- if (!read_bignum(cpp, ret->dsa->pub_key))
- return 0;
+ space = strchr(cp, ' ');
+ if (space == NULL) {
+ debug3("key_read: missing whitespace");
+ return -1;
+ }
+ *space = '\0';
+ type = key_type_from_name(cp);
+ *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;
+ }
+/*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*/
+ 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("bad key type: %d", ret->type);
+ fatal("key_read: bad key type: %d", ret->type);
break;
}
- return 1;
+ return success;
}
+
int
-key_write(Key *key, FILE *f)
+key_write(const Key *key, FILE *f)
{
- int success = 0;
- unsigned int bits = 0;
+ int n, success = 0;
+ u_int len, bits = 0;
+ u_char *blob;
+ char *uu;
- 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) {
- /* bits == 0 means DSA key */
- bits = 0;
- fprintf(f, "%u", bits);
- if (write_bignum(f, key->dsa->p) &&
- write_bignum(f, key->dsa->q) &&
- write_bignum(f, key->dsa->g) &&
- write_bignum(f, key->dsa->pub_key)) {
+ } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
+ (key->type == KEY_RSA && key->rsa != NULL)) {
+ 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;
- } else {
- error("key_write: failed for DSA key");
}
+ 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";
+ }
+ 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";
+ }
+ return "ssh-unknown";
+}
+
+u_int
+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);
+ }
+ return 0;
+}
+
+static RSA *
+rsa_generate_private_key(u_int bits)
+{
+ RSA *private;
+
+ private = RSA_generate_key(bits, RSA_F4, NULL, NULL);
+ if (private == NULL)
+ 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)
+ 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(const Key *k)
+{
+ Key *n = NULL;
+ switch (k->type) {
+ case KEY_DSA:
+ n = 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))
+ fatal("key_from_private: BN_copy failed");
+ break;
+ case KEY_RSA:
+ case KEY_RSA1:
+ n = key_new(k->type);
+ if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
+ (BN_copy(n->rsa->e, k->rsa->e) == NULL))
+ fatal("key_from_private: BN_copy failed");
+ 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;
+ }
+ debug2("key_type_from_name: unknown key type '%s'", name);
+ return KEY_UNSPEC;
+}
+
+int
+key_names_valid2(const char *names)
+{
+ char *s, *cp, *p;
+
+ if (names == NULL || strcmp(names, "") == 0)
+ return 0;
+ s = cp = xstrdup(names);
+ for ((p = strsep(&cp, ",")); p && *p != '\0';
+ (p = strsep(&cp, ","))) {
+ switch (key_type_from_name(p)) {
+ case KEY_RSA1:
+ case KEY_UNSPEC:
+ xfree(s);
+ return 0;
+ }
+ }
+ debug3("key names ok: [%s]", names);
+ xfree(s);
+ return 1;
+}
+
+Key *
+key_from_blob(const u_char *blob, u_int blen)
+{
+ Buffer b;
+ int rlen, type;
+ char *ktype = NULL;
+ Key *key = NULL;
+
+#ifdef DEBUG_PK
+ dump_base64(stderr, blob, blen);
+#endif
+ buffer_init(&b);
+ buffer_append(&b, blob, blen);
+ if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) {
+ error("key_from_blob: can't read key type");
+ goto out;
+ }
+
+ type = key_type_from_name(ktype);
+
+ switch (type) {
+ case KEY_RSA:
+ key = key_new(type);
+ if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
+ buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
+ error("key_from_blob: can't read rsa key");
+ key_free(key);
+ key = NULL;
+ goto out;
+ }
+#ifdef DEBUG_PK
+ RSA_print_fp(stderr, key->rsa, 8);
+#endif
+ break;
+ case KEY_DSA:
+ key = key_new(type);
+ if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
+ buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
+ buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
+ buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
+ error("key_from_blob: can't read dsa key");
+ key_free(key);
+ key = NULL;
+ goto out;
+ }
+#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);
+ goto out;
+ }
+ rlen = buffer_len(&b);
+ if (key != NULL && rlen != 0)
+ error("key_from_blob: remaining bytes in key blob %d", rlen);
+ out:
+ if (ktype != NULL)
+ xfree(ktype);
+ buffer_free(&b);
+ return key;
+}
+
+int
+key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
+{
+ Buffer b;
+ int len;
+
+ 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: unsupported key type %d", key->type);
+ buffer_free(&b);
+ return 0;
+ }
+ len = buffer_len(&b);
+ if (lenp != NULL)
+ *lenp = len;
+ if (blobp != NULL) {
+ *blobp = xmalloc(len);
+ memcpy(*blobp, buffer_ptr(&b), len);
+ }
+ memset(buffer_ptr(&b), 0, len);
+ buffer_free(&b);
+ return len;
+}
+
+int
+key_sign(
+ const Key *key,
+ u_char **sigp, u_int *lenp,
+ const u_char *data, u_int datalen)
+{
+ switch (key->type) {
+ case KEY_DSA:
+ return ssh_dss_sign(key, sigp, lenp, data, datalen);
+ case KEY_RSA:
+ return ssh_rsa_sign(key, sigp, lenp, data, datalen);
+ default:
+ error("key_sign: invalid key type %d", key->type);
+ return -1;
+ }
+}
+
+/*
+ * key_verify returns 1 for a correct signature, 0 for an incorrect signature
+ * and -1 on error.
+ */
+int
+key_verify(
+ const Key *key,
+ const u_char *signature, u_int signaturelen,
+ const u_char *data, u_int datalen)
+{
+ if (signaturelen == 0)
+ return -1;
+
+ switch (key->type) {
+ case KEY_DSA:
+ return ssh_dss_verify(key, signature, signaturelen, data, datalen);
+ case KEY_RSA:
+ return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
+ default:
+ error("key_verify: invalid key type %d", key->type);
+ return -1;
+ }
+}
+
+/* Converts a private to a public key */
+Key *
+key_demote(const Key *k)
+{
+ Key *pk;
+
+ pk = xcalloc(1, sizeof(*pk));
+ pk->type = k->type;
+ pk->flags = k->flags;
+ pk->dsa = NULL;
+ pk->rsa = NULL;
+
+ switch (k->type) {
+ case KEY_RSA1:
+ case KEY_RSA:
+ if ((pk->rsa = RSA_new()) == NULL)
+ fatal("key_demote: RSA_new failed");
+ if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ break;
+ case KEY_DSA:
+ if ((pk->dsa = DSA_new()) == NULL)
+ fatal("key_demote: DSA_new failed");
+ if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ break;
+ default:
+ fatal("key_free: bad key type %d", k->type);
+ break;
+ }
+
+ return (pk);
+}
andersk / openssh.git / blobdiff