/*
- *
- * authfile.c
- *
* Author: Tatu Ylonen <ylo@cs.hut.fi>
- *
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
- *
- * Created: Mon Mar 27 03:52:05 1995 ylo
- *
* This file contains functions for reading and writing identity files, and
* for reading the passphrase from the user.
- *
+ *
+ * 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
+ * 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"
-RCSID("$Id$");
+RCSID("$OpenBSD: authfile.c,v 1.20 2000/10/11 20:27:23 markus Exp $");
-#ifdef HAVE_OPENSSL
#include <openssl/bn.h>
-#endif
-#ifdef HAVE_SSL
-#include <ssl/bn.h>
-#endif
+#include <openssl/dsa.h>
+#include <openssl/rsa.h>
+#include <openssl/pem.h>
+#include <openssl/evp.h>
#include "xmalloc.h"
#include "buffer.h"
#include "bufaux.h"
-#include "cipher.h"
#include "ssh.h"
+#include "key.h"
/* Version identification string for identity files. */
#define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n"
-/* Saves the authentication (private) key in a file, encrypting it with
- passphrase. The identification of the file (lowest 64 bits of n)
- will precede the key to provide identification of the key without
- needing a passphrase. */
+/*
+ * Saves the authentication (private) key in a file, encrypting it with
+ * passphrase. The identification of the file (lowest 64 bits of n) will
+ * precede the key to provide identification of the key without needing a
+ * passphrase.
+ */
int
-save_private_key(const char *filename, const char *passphrase,
- RSA *key, const char *comment)
+save_private_key_rsa(const char *filename, const char *passphrase,
+ RSA *key, const char *comment)
{
Buffer buffer, encrypted;
char buf[100], *cp;
- int f, i;
- CipherContext cipher;
- int cipher_type;
+ int fd, i;
+ CipherContext ciphercontext;
+ Cipher *cipher;
u_int32_t rand;
- /* If the passphrase is empty, use SSH_CIPHER_NONE to ease
- converting to another cipher; otherwise use
- SSH_AUTHFILE_CIPHER. */
+ /*
+ * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
+ * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
+ */
if (strcmp(passphrase, "") == 0)
- cipher_type = SSH_CIPHER_NONE;
+ cipher = cipher_by_number(SSH_CIPHER_NONE);
else
- cipher_type = SSH_AUTHFILE_CIPHER;
+ cipher = cipher_by_number(SSH_AUTHFILE_CIPHER);
+ if (cipher == NULL)
+ fatal("save_private_key_rsa: bad cipher");
/* This buffer is used to built the secret part of the private key. */
buffer_init(&buffer);
buf[3] = buf[1];
buffer_append(&buffer, buf, 4);
- /* Store the private key (n and e will not be stored because they
- will be stored in plain text, and storing them also in
- encrypted format would just give known plaintext). */
+ /*
+ * Store the private key (n and e will not be stored because they
+ * will be stored in plain text, and storing them also in encrypted
+ * format would just give known plaintext).
+ */
buffer_put_bignum(&buffer, key->d);
buffer_put_bignum(&buffer, key->iqmp);
buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */
buffer_put_char(&encrypted, 0);
/* Store cipher type. */
- buffer_put_char(&encrypted, cipher_type);
+ buffer_put_char(&encrypted, cipher->number);
buffer_put_int(&encrypted, 0); /* For future extension */
/* Store public key. This will be in plain text. */
/* Allocate space for the private part of the key in the buffer. */
buffer_append_space(&encrypted, &cp, buffer_len(&buffer));
- cipher_set_key_string(&cipher, cipher_type, passphrase, 1);
- cipher_encrypt(&cipher, (unsigned char *) cp,
- (unsigned char *) buffer_ptr(&buffer),
- buffer_len(&buffer));
- memset(&cipher, 0, sizeof(cipher));
+ cipher_set_key_string(&ciphercontext, cipher, passphrase);
+ cipher_encrypt(&ciphercontext, (unsigned char *) cp,
+ (unsigned char *) buffer_ptr(&buffer), buffer_len(&buffer));
+ memset(&ciphercontext, 0, sizeof(ciphercontext));
/* Destroy temporary data. */
memset(buf, 0, sizeof(buf));
buffer_free(&buffer);
- /* Write to a file. */
- f = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
- if (f < 0)
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0)
return 0;
-
- if (write(f, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
+ if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
buffer_len(&encrypted)) {
debug("Write to key file %.200s failed: %.100s", filename,
strerror(errno));
buffer_free(&encrypted);
- close(f);
- remove(filename);
+ close(fd);
+ unlink(filename);
return 0;
}
- close(f);
+ close(fd);
buffer_free(&encrypted);
return 1;
}
-/* Loads the public part of the key file. Returns 0 if an error
- was encountered (the file does not exist or is not readable), and
- non-zero otherwise. */
+/* save DSA key in OpenSSL PEM format */
int
-load_public_key(const char *filename, RSA * pub,
- char **comment_return)
+save_private_key_dsa(const char *filename, const char *passphrase,
+ DSA *dsa, const char *comment)
{
- int f, i;
+ FILE *fp;
+ int fd;
+ int success = 1;
+ int len = strlen(passphrase);
+
+ if (len > 0 && len <= 4) {
+ error("passphrase too short: %d bytes", len);
+ errno = 0;
+ return 0;
+ }
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0) {
+ debug("open %s failed", filename);
+ return 0;
+ }
+ fp = fdopen(fd, "w");
+ if (fp == NULL ) {
+ debug("fdopen %s failed", filename);
+ close(fd);
+ return 0;
+ }
+ if (len > 0) {
+ if (!PEM_write_DSAPrivateKey(fp, dsa, EVP_des_ede3_cbc(),
+ (char *)passphrase, strlen(passphrase), NULL, NULL))
+ success = 0;
+ } else {
+ if (!PEM_write_DSAPrivateKey(fp, dsa, NULL,
+ NULL, 0, NULL, NULL))
+ success = 0;
+ }
+ fclose(fp);
+ return success;
+}
+
+int
+save_private_key(const char *filename, const char *passphrase, Key *key,
+ const char *comment)
+{
+ switch (key->type) {
+ case KEY_RSA:
+ return save_private_key_rsa(filename, passphrase, key->rsa, comment);
+ break;
+ case KEY_DSA:
+ return save_private_key_dsa(filename, passphrase, key->dsa, comment);
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Loads the public part of the key file. Returns 0 if an error was
+ * encountered (the file does not exist or is not readable), and non-zero
+ * otherwise.
+ */
+
+int
+load_public_key_rsa(const char *filename, RSA * pub, char **comment_return)
+{
+ int fd, i;
off_t len;
Buffer buffer;
char *cp;
- /* Read data from the file into the buffer. */
- f = open(filename, O_RDONLY);
- if (f < 0)
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
return 0;
-
- len = lseek(f, (off_t) 0, SEEK_END);
- lseek(f, (off_t) 0, SEEK_SET);
+ len = lseek(fd, (off_t) 0, SEEK_END);
+ lseek(fd, (off_t) 0, SEEK_SET);
buffer_init(&buffer);
buffer_append_space(&buffer, &cp, len);
- if (read(f, cp, (size_t) len) != (size_t) len) {
+ if (read(fd, cp, (size_t) len) != (size_t) len) {
debug("Read from key file %.200s failed: %.100s", filename,
- strerror(errno));
+ strerror(errno));
buffer_free(&buffer);
- close(f);
+ close(fd);
return 0;
}
- close(f);
+ close(fd);
/* Check that it is at least big enought to contain the ID string. */
if (len < strlen(AUTHFILE_ID_STRING) + 1) {
buffer_free(&buffer);
return 0;
}
- /* Make sure it begins with the id string. Consume the id string
- from the buffer. */
+ /*
+ * Make sure it begins with the id string. Consume the id string
+ * from the buffer.
+ */
for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++)
- if (buffer_get_char(&buffer) != (unsigned char) AUTHFILE_ID_STRING[i]) {
+ if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) {
debug("Bad key file %.200s.", filename);
buffer_free(&buffer);
return 0;
/* Read the public key from the buffer. */
buffer_get_int(&buffer);
- pub->n = BN_new();
+ /* XXX alloc */
+ if (pub->n == NULL)
+ pub->n = BN_new();
buffer_get_bignum(&buffer, pub->n);
- pub->e = BN_new();
+ /* XXX alloc */
+ if (pub->e == NULL)
+ pub->e = BN_new();
buffer_get_bignum(&buffer, pub->e);
if (comment_return)
*comment_return = buffer_get_string(&buffer, NULL);
return 1;
}
-/* Loads the private key from the file. Returns 0 if an error is encountered
- (file does not exist or is not readable, or passphrase is bad).
- This initializes the private key. */
+/* load public key from private-key file */
+int
+load_public_key(const char *filename, Key * key, char **comment_return)
+{
+ switch (key->type) {
+ case KEY_RSA:
+ return load_public_key_rsa(filename, key->rsa, comment_return);
+ break;
+ case KEY_DSA:
+ default:
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Loads the private key from the file. Returns 0 if an error is encountered
+ * (file does not exist or is not readable, or passphrase is bad). This
+ * initializes the private key.
+ * Assumes we are called under uid of the owner of the file.
+ */
int
-load_private_key(const char *filename, const char *passphrase,
- RSA * prv, char **comment_return)
+load_private_key_rsa(int fd, const char *filename,
+ const char *passphrase, RSA * prv, char **comment_return)
{
- int f, i, check1, check2, cipher_type;
+ int i, check1, check2, cipher_type;
off_t len;
Buffer buffer, decrypted;
char *cp;
- CipherContext cipher;
+ CipherContext ciphercontext;
+ Cipher *cipher;
BN_CTX *ctx;
BIGNUM *aux;
- struct stat st;
-
- /* Read the file into the buffer. */
- f = open(filename, O_RDONLY);
- if (f < 0)
- return 0;
- /* We assume we are called under uid of the owner of the file */
- if (fstat(f, &st) < 0 ||
- (st.st_uid != 0 && st.st_uid != getuid()) ||
- (st.st_mode & 077) != 0) {
- error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
- error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
- error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
- error("Bad ownership or mode(0%3.3o) for '%s'.",
- st.st_mode & 0777, filename);
- error("It is recommended that your private key files are NOT accessible by others.");
- return 0;
- }
- len = lseek(f, (off_t) 0, SEEK_END);
- lseek(f, (off_t) 0, SEEK_SET);
+ len = lseek(fd, (off_t) 0, SEEK_END);
+ lseek(fd, (off_t) 0, SEEK_SET);
buffer_init(&buffer);
buffer_append_space(&buffer, &cp, len);
- if (read(f, cp, (size_t) len) != (size_t) len) {
+ if (read(fd, cp, (size_t) len) != (size_t) len) {
debug("Read from key file %.200s failed: %.100s", filename,
strerror(errno));
buffer_free(&buffer);
- close(f);
+ close(fd);
return 0;
}
- close(f);
+ close(fd);
/* Check that it is at least big enought to contain the ID string. */
if (len < strlen(AUTHFILE_ID_STRING) + 1) {
buffer_free(&buffer);
return 0;
}
- /* Make sure it begins with the id string. Consume the id string
- from the buffer. */
+ /*
+ * Make sure it begins with the id string. Consume the id string
+ * from the buffer.
+ */
for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++)
if (buffer_get_char(&buffer) != (unsigned char) AUTHFILE_ID_STRING[i]) {
debug("Bad key file %.200s.", filename);
xfree(buffer_get_string(&buffer, NULL));
/* Check that it is a supported cipher. */
- if (((cipher_mask() | SSH_CIPHER_NONE | SSH_AUTHFILE_CIPHER) &
- (1 << cipher_type)) == 0) {
- debug("Unsupported cipher %.100s used in key file %.200s.",
- cipher_name(cipher_type), filename);
+ cipher = cipher_by_number(cipher_type);
+ if (cipher == NULL) {
+ debug("Unsupported cipher %d used in key file %.200s.",
+ cipher_type, filename);
buffer_free(&buffer);
goto fail;
}
buffer_append_space(&decrypted, &cp, buffer_len(&buffer));
/* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
- cipher_set_key_string(&cipher, cipher_type, passphrase, 0);
- cipher_decrypt(&cipher, (unsigned char *) cp,
- (unsigned char *) buffer_ptr(&buffer),
- buffer_len(&buffer));
-
+ cipher_set_key_string(&ciphercontext, cipher, passphrase);
+ cipher_decrypt(&ciphercontext, (unsigned char *) cp,
+ (unsigned char *) buffer_ptr(&buffer), buffer_len(&buffer));
+ memset(&ciphercontext, 0, sizeof(ciphercontext));
buffer_free(&buffer);
check1 = buffer_get_char(&decrypted);
buffer_free(&decrypted);
fail:
BN_clear_free(prv->n);
+ prv->n = NULL;
BN_clear_free(prv->e);
+ prv->e = NULL;
if (comment_return)
xfree(*comment_return);
return 0;
return 1;
}
+
+int
+load_private_key_dsa(int fd, const char *passphrase, Key *k, char **comment_return)
+{
+ DSA *dsa;
+ BIO *in;
+ FILE *fp;
+
+ in = BIO_new(BIO_s_file());
+ if (in == NULL) {
+ error("BIO_new failed");
+ return 0;
+ }
+ fp = fdopen(fd, "r");
+ if (fp == NULL) {
+ error("fdopen failed");
+ return 0;
+ }
+ BIO_set_fp(in, fp, BIO_NOCLOSE);
+ dsa = PEM_read_bio_DSAPrivateKey(in, NULL, NULL, (char *)passphrase);
+ if (dsa == NULL) {
+ debug("PEM_read_bio_DSAPrivateKey failed");
+ } else {
+ /* replace k->dsa with loaded key */
+ DSA_free(k->dsa);
+ k->dsa = dsa;
+ }
+ BIO_free(in);
+ fclose(fp);
+ if (comment_return)
+ *comment_return = xstrdup("dsa w/o comment");
+ debug("read DSA private key done");
+#ifdef DEBUG_DSS
+ DSA_print_fp(stderr, dsa, 8);
+#endif
+ return dsa != NULL ? 1 : 0;
+}
+
+int
+load_private_key(const char *filename, const char *passphrase, Key *key,
+ char **comment_return)
+{
+ int fd;
+ int ret = 0;
+ struct stat st;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return 0;
+
+ /* check owner and modes */
+#ifdef HAVE_CYGWIN
+ if (check_ntsec(filename))
+#endif
+ if (fstat(fd, &st) < 0 ||
+ (st.st_uid != 0 && st.st_uid != getuid()) ||
+ (st.st_mode & 077) != 0) {
+ close(fd);
+ error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
+ error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
+ error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
+ error("Bad ownership or mode(0%3.3o) for '%s'.",
+ st.st_mode & 0777, filename);
+ error("It is recommended that your private key files are NOT accessible by others.");
+ return 0;
+ }
+ switch (key->type) {
+ case KEY_RSA:
+ if (key->rsa->e != NULL) {
+ BN_clear_free(key->rsa->e);
+ key->rsa->e = NULL;
+ }
+ if (key->rsa->n != NULL) {
+ BN_clear_free(key->rsa->n);
+ key->rsa->n = NULL;
+ }
+ ret = load_private_key_rsa(fd, filename, passphrase,
+ key->rsa, comment_return);
+ break;
+ case KEY_DSA:
+ ret = load_private_key_dsa(fd, passphrase, key, comment_return);
+ default:
+ break;
+ }
+ close(fd);
+ return ret;
+}
+
+int
+do_load_public_key(const char *filename, Key *k, char **commentp)
+{
+ FILE *f;
+ unsigned int bits;
+ char line[1024];
+ char *cp;
+
+ f = fopen(filename, "r");
+ if (f != NULL) {
+ while (fgets(line, sizeof(line), f)) {
+ line[sizeof(line)-1] = '\0';
+ cp = line;
+ switch(*cp){
+ case '#':
+ case '\n':
+ case '\0':
+ continue;
+ }
+ /* Skip leading whitespace. */
+ for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
+ ;
+ if (*cp) {
+ bits = key_read(k, &cp);
+ if (bits != 0) {
+ if (commentp)
+ *commentp=xstrdup(filename);
+ fclose(f);
+ return 1;
+ }
+ }
+ }
+ fclose(f);
+ }
+ return 0;
+}
+
+/* load public key from pubkey file */
+int
+try_load_public_key(const char *filename, Key *k, char **commentp)
+{
+ char pub[MAXPATHLEN];
+
+ if (do_load_public_key(filename, k, commentp) == 1)
+ return 1;
+ if (strlcpy(pub, filename, sizeof pub) >= MAXPATHLEN)
+ return 0;
+ if (strlcat(pub, ".pub", sizeof pub) >= MAXPATHLEN)
+ return 0;
+ if (do_load_public_key(pub, k, commentp) == 1)
+ return 1;
+ return 0;
+}
andersk / openssh.git / blobdiff