diff options
Diffstat (limited to 'authfile.c')
| -rw-r--r-- | authfile.c | 946 |
1 files changed, 0 insertions, 946 deletions
diff --git a/authfile.c b/authfile.c deleted file mode 100644 index 1d7e53cd..00000000 --- a/authfile.c +++ /dev/null @@ -1,946 +0,0 @@ -/* $OpenBSD: authfile.c,v 1.92 2011/06/14 22:49:18 markus Exp $ */ -/* - * Author: Tatu Ylonen <ylo@cs.hut.fi> - * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland - * All rights reserved - * 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" - -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/param.h> -#include <sys/uio.h> - -#include <openssl/err.h> -#include <openssl/evp.h> -#include <openssl/pem.h> - -/* compatibility with old or broken OpenSSL versions */ -#include "openbsd-compat/openssl-compat.h" - -#include <errno.h> -#include <fcntl.h> -#include <stdarg.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#include "xmalloc.h" -#include "cipher.h" -#include "buffer.h" -#include "key.h" -#include "ssh.h" -#include "log.h" -#include "authfile.h" -#include "rsa.h" -#include "misc.h" -#include "atomicio.h" - -#define MAX_KEY_FILE_SIZE (1024 * 1024) - -/* Version identification string for SSH v1 identity files. */ -static const char authfile_id_string[] = - "SSH PRIVATE KEY FILE FORMAT 1.1\n"; - -/* - * Serialises the authentication (private) key to a blob, encrypting it with - * passphrase. The identification of the blob (lowest 64 bits of n) will - * precede the key to provide identification of the key without needing a - * passphrase. - */ -static int -key_private_rsa1_to_blob(Key *key, Buffer *blob, const char *passphrase, - const char *comment) -{ - Buffer buffer, encrypted; - u_char buf[100], *cp; - int i, cipher_num; - CipherContext ciphercontext; - Cipher *cipher; - u_int32_t rnd; - - /* - * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting - * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. - */ - cipher_num = (strcmp(passphrase, "") == 0) ? - SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; - if ((cipher = cipher_by_number(cipher_num)) == NULL) - fatal("save_private_key_rsa: bad cipher"); - - /* This buffer is used to built the secret part of the private key. */ - buffer_init(&buffer); - - /* Put checkbytes for checking passphrase validity. */ - rnd = arc4random(); - buf[0] = rnd & 0xff; - buf[1] = (rnd >> 8) & 0xff; - buf[2] = buf[0]; - 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). - */ - buffer_put_bignum(&buffer, key->rsa->d); - buffer_put_bignum(&buffer, key->rsa->iqmp); - buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */ - buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */ - - /* Pad the part to be encrypted until its size is a multiple of 8. */ - while (buffer_len(&buffer) % 8 != 0) - buffer_put_char(&buffer, 0); - - /* This buffer will be used to contain the data in the file. */ - buffer_init(&encrypted); - - /* First store keyfile id string. */ - for (i = 0; authfile_id_string[i]; i++) - buffer_put_char(&encrypted, authfile_id_string[i]); - buffer_put_char(&encrypted, 0); - - /* Store cipher type. */ - buffer_put_char(&encrypted, cipher_num); - buffer_put_int(&encrypted, 0); /* For future extension */ - - /* Store public key. This will be in plain text. */ - buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); - buffer_put_bignum(&encrypted, key->rsa->n); - buffer_put_bignum(&encrypted, key->rsa->e); - buffer_put_cstring(&encrypted, comment); - - /* Allocate space for the private part of the key in the buffer. */ - cp = buffer_append_space(&encrypted, buffer_len(&buffer)); - - cipher_set_key_string(&ciphercontext, cipher, passphrase, - CIPHER_ENCRYPT); - cipher_crypt(&ciphercontext, cp, - buffer_ptr(&buffer), buffer_len(&buffer)); - cipher_cleanup(&ciphercontext); - memset(&ciphercontext, 0, sizeof(ciphercontext)); - - /* Destroy temporary data. */ - memset(buf, 0, sizeof(buf)); - buffer_free(&buffer); - - buffer_append(blob, buffer_ptr(&encrypted), buffer_len(&encrypted)); - buffer_free(&encrypted); - - return 1; -} - -/* convert SSH v2 key in OpenSSL PEM format */ -static int -key_private_pem_to_blob(Key *key, Buffer *blob, const char *_passphrase, - const char *comment) -{ - int success = 0; - int blen, len = strlen(_passphrase); - u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; -#if (OPENSSL_VERSION_NUMBER < 0x00907000L) - const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; -#else - const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL; -#endif - const u_char *bptr; - BIO *bio; - - if (len > 0 && len <= 4) { - error("passphrase too short: have %d bytes, need > 4", len); - return 0; - } - if ((bio = BIO_new(BIO_s_mem())) == NULL) { - error("%s: BIO_new failed", __func__); - return 0; - } - switch (key->type) { - case KEY_DSA: - success = PEM_write_bio_DSAPrivateKey(bio, key->dsa, - cipher, passphrase, len, NULL, NULL); - break; -#ifdef OPENSSL_HAS_ECC - case KEY_ECDSA: - success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa, - cipher, passphrase, len, NULL, NULL); - break; -#endif - case KEY_RSA: - success = PEM_write_bio_RSAPrivateKey(bio, key->rsa, - cipher, passphrase, len, NULL, NULL); - break; - } - if (success) { - if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) - success = 0; - else - buffer_append(blob, bptr, blen); - } - BIO_free(bio); - return success; -} - -/* Save a key blob to a file */ -static int -key_save_private_blob(Buffer *keybuf, const char *filename) -{ - int fd; - - if ((fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600)) < 0) { - error("open %s failed: %s.", filename, strerror(errno)); - return 0; - } - if (atomicio(vwrite, fd, buffer_ptr(keybuf), - buffer_len(keybuf)) != buffer_len(keybuf)) { - error("write to key file %s failed: %s", filename, - strerror(errno)); - close(fd); - unlink(filename); - return 0; - } - close(fd); - return 1; -} - -/* Serialise "key" to buffer "blob" */ -static int -key_private_to_blob(Key *key, Buffer *blob, const char *passphrase, - const char *comment) -{ - switch (key->type) { - case KEY_RSA1: - return key_private_rsa1_to_blob(key, blob, passphrase, comment); - case KEY_DSA: - case KEY_ECDSA: - case KEY_RSA: - return key_private_pem_to_blob(key, blob, passphrase, comment); - default: - error("%s: cannot save key type %d", __func__, key->type); - return 0; - } -} - -int -key_save_private(Key *key, const char *filename, const char *passphrase, - const char *comment) -{ - Buffer keyblob; - int success = 0; - - buffer_init(&keyblob); - if (!key_private_to_blob(key, &keyblob, passphrase, comment)) - goto out; - if (!key_save_private_blob(&keyblob, filename)) - goto out; - success = 1; - out: - buffer_free(&keyblob); - return success; -} - -/* - * Parse the public, unencrypted portion of a RSA1 key. - */ -static Key * -key_parse_public_rsa1(Buffer *blob, char **commentp) -{ - Key *pub; - Buffer copy; - - /* Check that it is at least big enough to contain the ID string. */ - if (buffer_len(blob) < sizeof(authfile_id_string)) { - debug3("Truncated RSA1 identifier"); - return NULL; - } - - /* - * Make sure it begins with the id string. Consume the id string - * from the buffer. - */ - if (memcmp(buffer_ptr(blob), authfile_id_string, - sizeof(authfile_id_string)) != 0) { - debug3("Incorrect RSA1 identifier"); - return NULL; - } - buffer_init(©); - buffer_append(©, buffer_ptr(blob), buffer_len(blob)); - buffer_consume(©, sizeof(authfile_id_string)); - - /* Skip cipher type and reserved data. */ - (void) buffer_get_char(©); /* cipher type */ - (void) buffer_get_int(©); /* reserved */ - - /* Read the public key from the buffer. */ - (void) buffer_get_int(©); - pub = key_new(KEY_RSA1); - buffer_get_bignum(©, pub->rsa->n); - buffer_get_bignum(©, pub->rsa->e); - if (commentp) - *commentp = buffer_get_string(©, NULL); - /* The encrypted private part is not parsed by this function. */ - buffer_free(©); - - return pub; -} - -/* Load a key from a fd into a buffer */ -int -key_load_file(int fd, const char *filename, Buffer *blob) -{ - u_char buf[1024]; - size_t len; - struct stat st; - - if (fstat(fd, &st) < 0) { - error("%s: fstat of key file %.200s%sfailed: %.100s", __func__, - filename == NULL ? "" : filename, - filename == NULL ? "" : " ", - strerror(errno)); - return 0; - } - if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 && - st.st_size > MAX_KEY_FILE_SIZE) { - toobig: - error("%s: key file %.200s%stoo large", __func__, - filename == NULL ? "" : filename, - filename == NULL ? "" : " "); - return 0; - } - buffer_init(blob); - for (;;) { - if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) { - if (errno == EPIPE) - break; - debug("%s: read from key file %.200s%sfailed: %.100s", - __func__, filename == NULL ? "" : filename, - filename == NULL ? "" : " ", strerror(errno)); - buffer_clear(blob); - bzero(buf, sizeof(buf)); - return 0; - } - buffer_append(blob, buf, len); - if (buffer_len(blob) > MAX_KEY_FILE_SIZE) { - buffer_clear(blob); - bzero(buf, sizeof(buf)); - goto toobig; - } - } - bzero(buf, sizeof(buf)); - if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 && - st.st_size != buffer_len(blob)) { - debug("%s: key file %.200s%schanged size while reading", - __func__, filename == NULL ? "" : filename, - filename == NULL ? "" : " "); - buffer_clear(blob); - return 0; - } - - return 1; -} - -/* - * Loads the public part of the ssh v1 key file. Returns NULL if an error was - * encountered (the file does not exist or is not readable), and the key - * otherwise. - */ -static Key * -key_load_public_rsa1(int fd, const char *filename, char **commentp) -{ - Buffer buffer; - Key *pub; - - buffer_init(&buffer); - if (!key_load_file(fd, filename, &buffer)) { - buffer_free(&buffer); - return NULL; - } - - pub = key_parse_public_rsa1(&buffer, commentp); - if (pub == NULL) - debug3("Could not load \"%s\" as a RSA1 public key", filename); - buffer_free(&buffer); - return pub; -} - -/* load public key from private-key file, works only for SSH v1 */ -Key * -key_load_public_type(int type, const char *filename, char **commentp) -{ - Key *pub; - int fd; - - if (type == KEY_RSA1) { - fd = open(filename, O_RDONLY); - if (fd < 0) - return NULL; - pub = key_load_public_rsa1(fd, filename, commentp); - close(fd); - return pub; - } - return NULL; -} - -static Key * -key_parse_private_rsa1(Buffer *blob, const char *passphrase, char **commentp) -{ - int check1, check2, cipher_type; - Buffer decrypted; - u_char *cp; - CipherContext ciphercontext; - Cipher *cipher; - Key *prv = NULL; - Buffer copy; - - /* Check that it is at least big enough to contain the ID string. */ - if (buffer_len(blob) < sizeof(authfile_id_string)) { - debug3("Truncated RSA1 identifier"); - return NULL; - } - - /* - * Make sure it begins with the id string. Consume the id string - * from the buffer. - */ - if (memcmp(buffer_ptr(blob), authfile_id_string, - sizeof(authfile_id_string)) != 0) { - debug3("Incorrect RSA1 identifier"); - return NULL; - } - buffer_init(©); - buffer_append(©, buffer_ptr(blob), buffer_len(blob)); - buffer_consume(©, sizeof(authfile_id_string)); - - /* Read cipher type. */ - cipher_type = buffer_get_char(©); - (void) buffer_get_int(©); /* Reserved data. */ - - /* Read the public key from the buffer. */ - (void) buffer_get_int(©); - prv = key_new_private(KEY_RSA1); - - buffer_get_bignum(©, prv->rsa->n); - buffer_get_bignum(©, prv->rsa->e); - if (commentp) - *commentp = buffer_get_string(©, NULL); - else - (void)buffer_get_string_ptr(©, NULL); - - /* Check that it is a supported cipher. */ - cipher = cipher_by_number(cipher_type); - if (cipher == NULL) { - debug("Unsupported RSA1 cipher %d", cipher_type); - buffer_free(©); - goto fail; - } - /* Initialize space for decrypted data. */ - buffer_init(&decrypted); - cp = buffer_append_space(&decrypted, buffer_len(©)); - - /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ - cipher_set_key_string(&ciphercontext, cipher, passphrase, - CIPHER_DECRYPT); - cipher_crypt(&ciphercontext, cp, - buffer_ptr(©), buffer_len(©)); - cipher_cleanup(&ciphercontext); - memset(&ciphercontext, 0, sizeof(ciphercontext)); - buffer_free(©); - - check1 = buffer_get_char(&decrypted); - check2 = buffer_get_char(&decrypted); - if (check1 != buffer_get_char(&decrypted) || - check2 != buffer_get_char(&decrypted)) { - if (strcmp(passphrase, "") != 0) - debug("Bad passphrase supplied for RSA1 key"); - /* Bad passphrase. */ - buffer_free(&decrypted); - goto fail; - } - /* Read the rest of the private key. */ - buffer_get_bignum(&decrypted, prv->rsa->d); - buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ - /* in SSL and SSH v1 p and q are exchanged */ - buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ - buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ - - /* calculate p-1 and q-1 */ - rsa_generate_additional_parameters(prv->rsa); - - buffer_free(&decrypted); - - /* enable blinding */ - if (RSA_blinding_on(prv->rsa, NULL) != 1) { - error("%s: RSA_blinding_on failed", __func__); - goto fail; - } - return prv; - -fail: - if (commentp) - xfree(*commentp); - key_free(prv); - return NULL; -} - -static Key * -key_parse_private_pem(Buffer *blob, int type, const char *passphrase, - char **commentp) -{ - EVP_PKEY *pk = NULL; - Key *prv = NULL; - char *name = "<no key>"; - BIO *bio; - - if ((bio = BIO_new_mem_buf(buffer_ptr(blob), - buffer_len(blob))) == NULL) { - error("%s: BIO_new_mem_buf failed", __func__); - return NULL; - } - - pk = PEM_read_bio_PrivateKey(bio, NULL, NULL, (char *)passphrase); - BIO_free(bio); - if (pk == NULL) { - debug("%s: PEM_read_PrivateKey failed", __func__); - (void)ERR_get_error(); - } else if (pk->type == EVP_PKEY_RSA && - (type == KEY_UNSPEC||type==KEY_RSA)) { - prv = key_new(KEY_UNSPEC); - prv->rsa = EVP_PKEY_get1_RSA(pk); - prv->type = KEY_RSA; - name = "rsa w/o comment"; -#ifdef DEBUG_PK - RSA_print_fp(stderr, prv->rsa, 8); -#endif - if (RSA_blinding_on(prv->rsa, NULL) != 1) { - error("%s: RSA_blinding_on failed", __func__); - key_free(prv); - prv = NULL; - } - } else if (pk->type == EVP_PKEY_DSA && - (type == KEY_UNSPEC||type==KEY_DSA)) { - prv = key_new(KEY_UNSPEC); - prv->dsa = EVP_PKEY_get1_DSA(pk); - prv->type = KEY_DSA; - name = "dsa w/o comment"; -#ifdef DEBUG_PK - DSA_print_fp(stderr, prv->dsa, 8); -#endif -#ifdef OPENSSL_HAS_ECC - } else if (pk->type == EVP_PKEY_EC && - (type == KEY_UNSPEC||type==KEY_ECDSA)) { - prv = key_new(KEY_UNSPEC); - prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); - prv->type = KEY_ECDSA; - if ((prv->ecdsa_nid = key_ecdsa_key_to_nid(prv->ecdsa)) == -1 || - key_curve_nid_to_name(prv->ecdsa_nid) == NULL || - key_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), - EC_KEY_get0_public_key(prv->ecdsa)) != 0 || - key_ec_validate_private(prv->ecdsa) != 0) { - error("%s: bad ECDSA key", __func__); - key_free(prv); - prv = NULL; - } - name = "ecdsa w/o comment"; -#ifdef DEBUG_PK - if (prv != NULL && prv->ecdsa != NULL) - key_dump_ec_key(prv->ecdsa); -#endif -#endif /* OPENSSL_HAS_ECC */ - } else { - error("%s: PEM_read_PrivateKey: mismatch or " - "unknown EVP_PKEY save_type %d", __func__, pk->save_type); - } - if (pk != NULL) - EVP_PKEY_free(pk); - if (prv != NULL && commentp) - *commentp = xstrdup(name); - debug("read PEM private key done: type %s", - prv ? key_type(prv) : "<unknown>"); - return prv; -} - -Key * -key_load_private_pem(int fd, int type, const char *passphrase, - char **commentp) -{ - Buffer buffer; - Key *prv; - - buffer_init(&buffer); - if (!key_load_file(fd, NULL, &buffer)) { - buffer_free(&buffer); - return NULL; - } - prv = key_parse_private_pem(&buffer, type, passphrase, commentp); - buffer_free(&buffer); - return prv; -} - -int -key_perm_ok(int fd, const char *filename) -{ - struct stat st; - - if (fstat(fd, &st) < 0) - return 0; - /* - * if a key owned by the user is accessed, then we check the - * permissions of the file. if the key owned by a different user, - * then we don't care. - */ -#ifdef HAVE_CYGWIN - if (check_ntsec(filename)) -#endif - if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { - error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); - error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); - error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); - error("Permissions 0%3.3o for '%s' are too open.", - (u_int)st.st_mode & 0777, filename); - error("It is required that your private key files are NOT accessible by others."); - error("This private key will be ignored."); - return 0; - } - return 1; -} - -static Key * -key_parse_private_type(Buffer *blob, int type, const char *passphrase, - char **commentp) -{ - switch (type) { - case KEY_RSA1: - return key_parse_private_rsa1(blob, passphrase, commentp); - case KEY_DSA: - case KEY_ECDSA: - case KEY_RSA: - case KEY_UNSPEC: - return key_parse_private_pem(blob, type, passphrase, commentp); - default: - error("%s: cannot parse key type %d", __func__, type); - break; - } - return NULL; -} - -Key * -key_load_private_type(int type, const char *filename, const char *passphrase, - char **commentp, int *perm_ok) -{ - int fd; - Key *ret; - Buffer buffer; - - fd = open(filename, O_RDONLY); - if (fd < 0) { - debug("could not open key file '%s': %s", filename, - strerror(errno)); - if (perm_ok != NULL) - *perm_ok = 0; - return NULL; - } - if (!key_perm_ok(fd, filename)) { - if (perm_ok != NULL) - *perm_ok = 0; - error("bad permissions: ignore key: %s", filename); - close(fd); - return NULL; - } - if (perm_ok != NULL) - *perm_ok = 1; - - buffer_init(&buffer); - if (!key_load_file(fd, filename, &buffer)) { - buffer_free(&buffer); - close(fd); - return NULL; - } - close(fd); - ret = key_parse_private_type(&buffer, type, passphrase, commentp); - buffer_free(&buffer); - return ret; -} - -Key * -key_parse_private(Buffer *buffer, const char *filename, - const char *passphrase, char **commentp) -{ - Key *pub, *prv; - - /* it's a SSH v1 key if the public key part is readable */ - pub = key_parse_public_rsa1(buffer, commentp); - if (pub == NULL) { - prv = key_parse_private_type(buffer, KEY_UNSPEC, - passphrase, NULL); - /* use the filename as a comment for PEM */ - if (commentp && prv) - *commentp = xstrdup(filename); - } else { - key_free(pub); - /* key_parse_public_rsa1() has already loaded the comment */ - prv = key_parse_private_type(buffer, KEY_RSA1, passphrase, - NULL); - } - return prv; -} - -Key * -key_load_private(const char *filename, const char *passphrase, - char **commentp) -{ - Key *prv; - Buffer buffer; - int fd; - - fd = open(filename, O_RDONLY); - if (fd < 0) { - debug("could not open key file '%s': %s", filename, - strerror(errno)); - return NULL; - } - if (!key_perm_ok(fd, filename)) { - error("bad permissions: ignore key: %s", filename); - close(fd); - return NULL; - } - - buffer_init(&buffer); - if (!key_load_file(fd, filename, &buffer)) { - buffer_free(&buffer); - close(fd); - return NULL; - } - close(fd); - - prv = key_parse_private(&buffer, filename, passphrase, commentp); - buffer_free(&buffer); - return prv; -} - -static int -key_try_load_public(Key *k, const char *filename, char **commentp) -{ - FILE *f; - char line[SSH_MAX_PUBKEY_BYTES]; - char *cp; - u_long linenum = 0; - - f = fopen(filename, "r"); - if (f != NULL) { - while (read_keyfile_line(f, filename, line, sizeof(line), - &linenum) != -1) { - cp = line; - switch (*cp) { - case '#': - case '\n': - case '\0': - continue; - } - /* Abort loading if this looks like a private key */ - if (strncmp(cp, "-----BEGIN", 10) == 0) - break; - /* Skip leading whitespace. */ - for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) - ; - if (*cp) { - if (key_read(k, &cp) == 1) { - cp[strcspn(cp, "\r\n")] = '\0'; - if (commentp) { - *commentp = xstrdup(*cp ? - cp : filename); - } - fclose(f); - return 1; - } - } - } - fclose(f); - } - return 0; -} - -/* load public key from ssh v1 private or any pubkey file */ -Key * -key_load_public(const char *filename, char **commentp) -{ - Key *pub; - char file[MAXPATHLEN]; - - /* try rsa1 private key */ - pub = key_load_public_type(KEY_RSA1, filename, commentp); - if (pub != NULL) - return pub; - - /* try rsa1 public key */ - pub = key_new(KEY_RSA1); - if (key_try_load_public(pub, filename, commentp) == 1) - return pub; - key_free(pub); - - /* try ssh2 public key */ - pub = key_new(KEY_UNSPEC); - if (key_try_load_public(pub, filename, commentp) == 1) - return pub; - if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && - (strlcat(file, ".pub", sizeof file) < sizeof(file)) && - (key_try_load_public(pub, file, commentp) == 1)) - return pub; - key_free(pub); - return NULL; -} - -/* Load the certificate associated with the named private key */ -Key * -key_load_cert(const char *filename) -{ - Key *pub; - char *file; - - pub = key_new(KEY_UNSPEC); - xasprintf(&file, "%s-cert.pub", filename); - if (key_try_load_public(pub, file, NULL) == 1) { - xfree(file); - return pub; - } - xfree(file); - key_free(pub); - return NULL; -} - -/* Load private key and certificate */ -Key * -key_load_private_cert(int type, const char *filename, const char *passphrase, - int *perm_ok) -{ - Key *key, *pub; - - switch (type) { - case KEY_RSA: - case KEY_DSA: - case KEY_ECDSA: - break; - default: - error("%s: unsupported key type", __func__); - return NULL; - } - - if ((key = key_load_private_type(type, filename, - passphrase, NULL, perm_ok)) == NULL) - return NULL; - - if ((pub = key_load_cert(filename)) == NULL) { - key_free(key); - return NULL; - } - - /* Make sure the private key matches the certificate */ - if (key_equal_public(key, pub) == 0) { - error("%s: certificate does not match private key %s", - __func__, filename); - } else if (key_to_certified(key, key_cert_is_legacy(pub)) != 0) { - error("%s: key_to_certified failed", __func__); - } else { - key_cert_copy(pub, key); - key_free(pub); - return key; - } - - key_free(key); - key_free(pub); - return NULL; -} - -/* - * Returns 1 if the specified "key" is listed in the file "filename", - * 0 if the key is not listed or -1 on error. - * If strict_type is set then the key type must match exactly, - * otherwise a comparison that ignores certficiate data is performed. - */ -int -key_in_file(Key *key, const char *filename, int strict_type) -{ - FILE *f; - char line[SSH_MAX_PUBKEY_BYTES]; - char *cp; - u_long linenum = 0; - int ret = 0; - Key *pub; - int (*key_compare)(const Key *, const Key *) = strict_type ? - key_equal : key_equal_public; - - if ((f = fopen(filename, "r")) == NULL) { - if (errno == ENOENT) { - debug("%s: keyfile \"%s\" missing", __func__, filename); - return 0; - } else { - error("%s: could not open keyfile \"%s\": %s", __func__, - filename, strerror(errno)); - return -1; - } - } - - while (read_keyfile_line(f, filename, line, sizeof(line), - &linenum) != -1) { - cp = line; - - /* Skip leading whitespace. */ - for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) - ; - - /* Skip comments and empty lines */ - switch (*cp) { - case '#': - case '\n': - case '\0': - continue; - } - - pub = key_new(KEY_UNSPEC); - if (key_read(pub, &cp) != 1) { - key_free(pub); - continue; - } - if (key_compare(key, pub)) { - ret = 1; - key_free(pub); - break; - } - key_free(pub); - } - fclose(f); - return ret; -} - |