diff options
Diffstat (limited to 'crypto/openssh/ssh-keygen.c')
| -rw-r--r-- | crypto/openssh/ssh-keygen.c | 105 |
1 files changed, 94 insertions, 11 deletions
diff --git a/crypto/openssh/ssh-keygen.c b/crypto/openssh/ssh-keygen.c index 29ee62d..e7b057f 100644 --- a/crypto/openssh/ssh-keygen.c +++ b/crypto/openssh/ssh-keygen.c @@ -12,7 +12,7 @@ */ #include "includes.h" -RCSID("$OpenBSD: ssh-keygen.c,v 1.31 2000/09/07 20:27:54 deraadt Exp $"); +RCSID("$OpenBSD: ssh-keygen.c,v 1.32 2000/10/09 21:30:44 markus Exp $"); #include <openssl/evp.h> #include <openssl/pem.h> @@ -27,6 +27,9 @@ RCSID("$OpenBSD: ssh-keygen.c,v 1.31 2000/09/07 20:27:54 deraadt Exp $"); #include "authfile.h" #include "uuencode.h" +#include "buffer.h" +#include "bufaux.h" + /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ int bits = 1024; @@ -104,8 +107,10 @@ try_load_key(char *filename, Key *k) return success; } -#define SSH_COM_MAGIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" -#define SSH_COM_MAGIC_END "---- END SSH2 PUBLIC KEY ----" +#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" +#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" +#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" +#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb void do_convert_to_ssh2(struct passwd *pw) @@ -127,19 +132,84 @@ do_convert_to_ssh2(struct passwd *pw) exit(1); } dsa_make_key_blob(k, &blob, &len); - fprintf(stdout, "%s\n", SSH_COM_MAGIC_BEGIN); + fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); fprintf(stdout, - "Comment: \"%d-bit DSA, converted from openssh by %s@%s\"\n", - BN_num_bits(k->dsa->p), + "Comment: \"%d-bit %s, converted from OpenSSH by %s@%s\"\n", + key_size(k), key_type(k), pw->pw_name, hostname); dump_base64(stdout, blob, len); - fprintf(stdout, "%s\n", SSH_COM_MAGIC_END); + fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); key_free(k); xfree(blob); exit(0); } void +buffer_get_bignum_bits(Buffer *b, BIGNUM *value) +{ + int bits = buffer_get_int(b); + int bytes = (bits + 7) / 8; + if (buffer_len(b) < bytes) + fatal("buffer_get_bignum_bits: input buffer too small"); + BN_bin2bn((unsigned char *)buffer_ptr(b), bytes, value); + buffer_consume(b, bytes); +} + +Key * +do_convert_private_ssh2_from_blob(char *blob, int blen) +{ + Buffer b; + DSA *dsa; + Key *key = NULL; + int ignore, magic, rlen; + char *type, *cipher; + + buffer_init(&b); + buffer_append(&b, blob, blen); + + magic = buffer_get_int(&b); + if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { + error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); + buffer_free(&b); + return NULL; + } + ignore = buffer_get_int(&b); + type = buffer_get_string(&b, NULL); + cipher = buffer_get_string(&b, NULL); + ignore = buffer_get_int(&b); + ignore = buffer_get_int(&b); + ignore = buffer_get_int(&b); + xfree(type); + + if (strcmp(cipher, "none") != 0) { + error("unsupported cipher %s", cipher); + xfree(cipher); + buffer_free(&b); + return NULL; + } + xfree(cipher); + + key = key_new(KEY_DSA); + dsa = key->dsa; + dsa->priv_key = BN_new(); + if (dsa->priv_key == NULL) { + error("alloc priv_key failed"); + key_free(key); + return NULL; + } + buffer_get_bignum_bits(&b, dsa->p); + buffer_get_bignum_bits(&b, dsa->g); + buffer_get_bignum_bits(&b, dsa->q); + buffer_get_bignum_bits(&b, dsa->pub_key); + buffer_get_bignum_bits(&b, dsa->priv_key); + rlen = buffer_len(&b); + if(rlen != 0) + error("do_convert_private_ssh2_from_blob: remaining bytes in key blob %d", rlen); + buffer_free(&b); + return key; +} + +void do_convert_from_ssh2(struct passwd *pw) { Key *k; @@ -148,7 +218,7 @@ do_convert_from_ssh2(struct passwd *pw) char blob[8096]; char encoded[8096]; struct stat st; - int escaped = 0; + int escaped = 0, private = 0, ok; FILE *fp; if (!have_identity) @@ -172,6 +242,8 @@ do_convert_from_ssh2(struct passwd *pw) escaped++; if (strncmp(line, "----", 4) == 0 || strstr(line, ": ") != NULL) { + if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) + private = 1; fprintf(stderr, "ignore: %s", line); continue; } @@ -188,9 +260,20 @@ do_convert_from_ssh2(struct passwd *pw) fprintf(stderr, "uudecode failed.\n"); exit(1); } - k = dsa_key_from_blob(blob, blen); - if (!key_write(k, stdout)) - fprintf(stderr, "key_write failed"); + k = private ? + do_convert_private_ssh2_from_blob(blob, blen) : + dsa_key_from_blob(blob, blen); + if (k == NULL) { + fprintf(stderr, "decode blob failed.\n"); + exit(1); + } + ok = private ? + PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : + key_write(k, stdout); + if (!ok) { + fprintf(stderr, "key write failed"); + exit(1); + } key_free(k); fprintf(stdout, "\n"); fclose(fp); |
