src/usr.bin/ssh/authfile.c - diff

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Diff for /src/usr.bin/ssh/authfile.c between version 1.20.2.7 and 1.21

version 1.20.2.7, 2002/03/08 17:04:42

version 1.21, 2000/11/12 19:50:37

Line 38

#include "includes.h"

RCSID("$OpenBSD$");

#include <openssl/bn.h>

#include <openssl/dsa.h>

#include <openssl/rsa.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/pem.h>

#include <openssl/evp.h>

#include "cipher.h"

#include "xmalloc.h"

#include "buffer.h"

#include "bufaux.h"

#include "key.h"

#include "ssh.h"

#include "log.h"

#include "key.h"

#include "authfile.h"

#include "rsa.h"

/* Version identification string for SSH v1 identity files. */

/* Version identification string for identity files. */

static const char authfile_id_string[] =

#define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n"

"SSH PRIVATE KEY FILE FORMAT 1.1\n";

* Saves the authentication (private) key in a file, encrypting it with

Line 63

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* passphrase.

static int

int

key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,

save_private_key_rsa1(const char *filename, const char *passphrase,

const char *comment)

RSA *key, const char *comment)

{

Buffer buffer, encrypted;

u_char buf[100], *cp;

char buf[100], *cp;

int fd, i, cipher_num;

int fd, i;

CipherContext ciphercontext;

Cipher *cipher;

u_int32_t rand;

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* 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) ?

if (strcmp(passphrase, "") == 0)

SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;

cipher = cipher_by_number(SSH_CIPHER_NONE);

if ((cipher = cipher_by_number(cipher_num)) == NULL)

else

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. */

Line 99

* 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->d);

buffer_put_bignum(&buffer, key->rsa->iqmp);

buffer_put_bignum(&buffer, key->iqmp);

buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */

buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */

buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */

buffer_put_bignum(&buffer, key->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)

Line 112

buffer_init(&encrypted);

/* First store keyfile id string. */

for (i = 0; authfile_id_string[i]; i++)

cp = AUTHFILE_ID_STRING;

buffer_put_char(&encrypted, authfile_id_string[i]);

for (i = 0; cp[i]; i++)

buffer_put_char(&encrypted, cp[i]);

buffer_put_char(&encrypted, 0);

/* Store cipher type. */

buffer_put_char(&encrypted, cipher_num);

buffer_put_char(&encrypted, cipher->number);

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_int(&encrypted, BN_num_bits(key->n));

buffer_put_bignum(&encrypted, key->rsa->n);

buffer_put_bignum(&encrypted, key->n);

buffer_put_bignum(&encrypted, key->rsa->e);

buffer_put_bignum(&encrypted, key->e);

buffer_put_cstring(&encrypted, comment);

buffer_put_string(&encrypted, comment, strlen(comment));

/* Allocate space for the private part of the key in the buffer. */

cp = buffer_append_space(&encrypted, buffer_len(&buffer));

buffer_append_space(&encrypted, &cp, buffer_len(&buffer));

cipher_set_key_string(&ciphercontext, cipher, passphrase,

cipher_set_key_string(&ciphercontext, cipher, passphrase);

CIPHER_ENCRYPT);

cipher_encrypt(&ciphercontext, (unsigned char *) cp,

cipher_crypt(&ciphercontext, cp,

(unsigned char *) buffer_ptr(&buffer), buffer_len(&buffer));

buffer_ptr(&buffer), buffer_len(&buffer));

cipher_cleanup(&ciphercontext);

memset(&ciphercontext, 0, sizeof(ciphercontext));

/* Destroy temporary data. */

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Line 140

buffer_free(&buffer);

fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);

if (fd < 0) {

if (fd < 0)

error("open %s failed: %s.", filename, strerror(errno));

return 0;

}

if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=

buffer_len(&encrypted)) {

error("write to key file %s failed: %s", filename,

debug("Write to key file %.200s failed: %.100s", filename,

strerror(errno));

buffer_free(&encrypted);

close(fd);

unlink(filename);

remove(filename);

return 0;

}

close(fd);

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return 1;

}

/* save SSH v2 key in OpenSSL PEM format */

/* save SSH2 key in OpenSSL PEM format */

static int

int

key_save_private_pem(Key *key, const char *filename, const char *_passphrase,

save_private_key_ssh2(const char *filename, const char *_passphrase,

const char *comment)

Key *key, const char *comment)

{

FILE *fp;

int fd;

int success = 0;

int len = strlen(_passphrase);

u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;

char *passphrase = (len > 0) ? (char *)_passphrase : NULL;

const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;

EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;

if (len > 0 && len <= 4) {

error("passphrase too short: have %d bytes, need > 4", len);

error("passphrase too short: %d bytes", len);

errno = 0;

return 0;

}

fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);

if (fd < 0) {

error("open %s failed: %s.", filename, strerror(errno));

debug("open %s failed", filename);

return 0;

}

fp = fdopen(fd, "w");

if (fp == NULL ) {

error("fdopen %s failed: %s.", filename, strerror(errno));

debug("fdopen %s failed", filename);

close(fd);

return 0;

}

switch (key->type) {

case KEY_DSA:

success = PEM_write_DSAPrivateKey(fp, key->dsa,

cipher, passphrase, len, NULL, NULL);

break;

case KEY_RSA:

success = PEM_write_RSAPrivateKey(fp, key->rsa,

cipher, passphrase, len, NULL, NULL);

break;

}

fclose(fp);

return success;

}

int

key_save_private(Key *key, const char *filename, const char *passphrase,

save_private_key(const char *filename, const char *passphrase, Key *key,

const char *comment)

{

switch (key->type) {

case KEY_RSA1:

return key_save_private_rsa1(key, filename, passphrase,

return save_private_key_rsa1(filename, passphrase, key->rsa, comment);

comment);

break;

case KEY_DSA:

case KEY_RSA:

return key_save_private_pem(key, filename, passphrase,

return save_private_key_ssh2(filename, passphrase, key, comment);

comment);

break;

default:

break;

}

error("key_save_private: cannot save key type %d", key->type);

return 0;

}

* Loads the public part of the ssh v1 key file. Returns NULL if an error was

* 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 the key

* encountered (the file does not exist or is not readable), and non-zero

* otherwise.

static Key *

int

key_load_public_rsa1(int fd, const char *filename, char **commentp)

load_public_key_rsa(const char *filename, RSA * pub, char **comment_return)

{

int fd, i;

off_t len;

Buffer buffer;

Key *pub;

char *cp;

int i;

off_t len;

fd = open(filename, O_RDONLY);

if (fd < 0)

return 0;

len = lseek(fd, (off_t) 0, SEEK_END);

lseek(fd, (off_t) 0, SEEK_SET);

buffer_init(&buffer);

cp = buffer_append_space(&buffer, len);

buffer_append_space(&buffer, &cp, 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);

return NULL;

close(fd);

return 0;

}

close(fd);

/* Check that it is at least big enough to contain the ID string. */

/* Check that it is at least big enought to contain the ID string. */

if (len < sizeof(authfile_id_string)) {

if (len < strlen(AUTHFILE_ID_STRING) + 1) {

debug3("Not a RSA1 key file %.200s.", filename);

debug3("Bad RSA1 key file %.200s.", filename);

buffer_free(&buffer);

return NULL;

return 0;

}

* Make sure it begins with the id string. Consume the id string

* from the buffer.

for (i = 0; i < sizeof(authfile_id_string); i++)

for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++)

if (buffer_get_char(&buffer) != authfile_id_string[i]) {

if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) {

debug3("Not a RSA1 key file %.200s.", filename);

debug3("Bad RSA1 key file %.200s.", filename);

buffer_free(&buffer);

return NULL;

return 0;

}

/* Skip cipher type and reserved data. */

(void) buffer_get_char(&buffer); /* cipher type */

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Line 270

/* Read the public key from the buffer. */

buffer_get_int(&buffer);

pub = key_new(KEY_RSA1);

/* XXX alloc */

buffer_get_bignum(&buffer, pub->rsa->n);

if (pub->n == NULL)

buffer_get_bignum(&buffer, pub->rsa->e);

pub->n = BN_new();

if (commentp)

buffer_get_bignum(&buffer, pub->n);

*commentp = buffer_get_string(&buffer, NULL);

/* 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);

/* The encrypted private part is not parsed by this function. */

buffer_free(&buffer);

return pub;

return 1;

}

/* load public key from private-key file, works only for SSH v1 */

/* load public key from private-key file */

Key *

int

key_load_public_type(int type, const char *filename, char **commentp)

load_public_key(const char *filename, Key * key, char **comment_return)

{

Key *pub;

switch (key->type) {

int fd;

case KEY_RSA1:

return load_public_key_rsa(filename, key->rsa, comment_return);

if (type == KEY_RSA1) {

break;

fd = open(filename, O_RDONLY);

case KEY_DSA:

if (fd < 0)

case KEY_RSA:

return NULL;

default:

pub = key_load_public_rsa1(fd, filename, commentp);

break;

close(fd);

return pub;

}

return NULL;

return 0;

}

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* Assumes we are called under uid of the owner of the file.

static Key *

int

key_load_private_rsa1(int fd, const char *filename, const char *passphrase,

load_private_key_rsa1(int fd, const char *filename,

char **commentp)

const char *passphrase, RSA * prv, char **comment_return)

{

int i, check1, check2, cipher_type;

off_t len;

Buffer buffer, decrypted;

u_char *cp;

char *cp;

CipherContext ciphercontext;

Cipher *cipher;

Key *prv = NULL;

BN_CTX *ctx;

BIGNUM *aux;

len = lseek(fd, (off_t) 0, SEEK_END);

lseek(fd, (off_t) 0, SEEK_SET);

buffer_init(&buffer);

cp = buffer_append_space(&buffer, len);

buffer_append_space(&buffer, &cp, 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(fd);

return NULL;

return 0;

}

close(fd);

/* Check that it is at least big enough to contain the ID string. */

/* Check that it is at least big enought to contain the ID string. */

if (len < sizeof(authfile_id_string)) {

if (len < strlen(AUTHFILE_ID_STRING) + 1) {

debug3("Not a RSA1 key file %.200s.", filename);

debug3("Bad RSA1 key file %.200s.", filename);

buffer_free(&buffer);

close(fd);

return 0;

return NULL;

}

* Make sure it begins with the id string. Consume the id string

* from the buffer.

for (i = 0; i < sizeof(authfile_id_string); i++)

for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++)

if (buffer_get_char(&buffer) != authfile_id_string[i]) {

if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) {

debug3("Not a RSA1 key file %.200s.", filename);

debug3("Bad RSA1 key file %.200s.", filename);

buffer_free(&buffer);

close(fd);

return 0;

return NULL;

}

/* Read cipher type. */

cipher_type = buffer_get_char(&buffer);

(void) buffer_get_int(&buffer); /* Reserved data. */

/* Read the public key from the buffer. */

buffer_get_int(&buffer);

prv = key_new_private(KEY_RSA1);

prv->n = BN_new();

buffer_get_bignum(&buffer, prv->n);

buffer_get_bignum(&buffer, prv->rsa->n);

prv->e = BN_new();

buffer_get_bignum(&buffer, prv->rsa->e);

buffer_get_bignum(&buffer, prv->e);

if (commentp)

if (comment_return)

*commentp = buffer_get_string(&buffer, NULL);

*comment_return = buffer_get_string(&buffer, NULL);

else

xfree(buffer_get_string(&buffer, NULL));

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Line 379

}

/* Initialize space for decrypted data. */

buffer_init(&decrypted);

cp = buffer_append_space(&decrypted, buffer_len(&buffer));

buffer_append_space(&decrypted, &cp, buffer_len(&buffer));

/* Rest of the buffer is encrypted. Decrypt it using the passphrase. */

cipher_set_key_string(&ciphercontext, cipher, passphrase,

cipher_set_key_string(&ciphercontext, cipher, passphrase);

CIPHER_DECRYPT);

cipher_decrypt(&ciphercontext, (unsigned char *) cp,

cipher_crypt(&ciphercontext, cp,

(unsigned char *) buffer_ptr(&buffer), buffer_len(&buffer));

buffer_ptr(&buffer), buffer_len(&buffer));

cipher_cleanup(&ciphercontext);

memset(&ciphercontext, 0, sizeof(ciphercontext));

buffer_free(&buffer);

Line 393

if (check1 != buffer_get_char(&decrypted) ||

check2 != buffer_get_char(&decrypted)) {

if (strcmp(passphrase, "") != 0)

debug("Bad passphrase supplied for key file %.200s.",

debug("Bad passphrase supplied for key file %.200s.", filename);

filename);

/* Bad passphrase. */

buffer_free(&decrypted);

goto fail;

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;

}

/* Read the rest of the private key. */

buffer_get_bignum(&decrypted, prv->rsa->d);

prv->d = BN_new();

buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */

buffer_get_bignum(&decrypted, prv->d);

/* in SSL and SSH v1 p and q are exchanged */

prv->iqmp = BN_new();

buffer_get_bignum(&decrypted, prv->rsa->q); /* p */

buffer_get_bignum(&decrypted, prv->iqmp); /* u */

buffer_get_bignum(&decrypted, prv->rsa->p); /* q */

/* in SSL and SSH p and q are exchanged */

prv->q = BN_new();

buffer_get_bignum(&decrypted, prv->q); /* p */

prv->p = BN_new();

buffer_get_bignum(&decrypted, prv->p); /* q */

/* calculate p-1 and q-1 */

ctx = BN_CTX_new();

rsa_generate_additional_parameters(prv->rsa);

aux = BN_new();

BN_sub(aux, prv->q, BN_value_one());

prv->dmq1 = BN_new();

BN_mod(prv->dmq1, prv->d, aux, ctx);

BN_sub(aux, prv->p, BN_value_one());

prv->dmp1 = BN_new();

BN_mod(prv->dmp1, prv->d, aux, ctx);

BN_clear_free(aux);

BN_CTX_free(ctx);

buffer_free(&decrypted);

close(fd);

return prv;

fail:

return 1;

if (commentp)

xfree(*commentp);

close(fd);

key_free(prv);

return NULL;

}

static Key *

int

key_load_private_pem(int fd, int type, const char *passphrase,

load_private_key_ssh2(int fd, const char *passphrase, Key *k, char **comment_return)

char **commentp)

{

FILE *fp;

int success = 0;

EVP_PKEY *pk = NULL;

Key *prv = NULL;

char *name = "<no key>";

fp = fdopen(fd, "r");

if (fp == NULL) {

error("fdopen failed: %s", strerror(errno));

error("fdopen failed");

close(fd);

return 0;

return NULL;

}

pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);

if (pk == NULL) {

debug("PEM_read_PrivateKey failed");

(void)ERR_get_error();

} else if (pk->type == EVP_PKEY_RSA &&

} else if (pk->type == EVP_PKEY_RSA) {

(type == KEY_UNSPEC||type==KEY_RSA)) {

/* replace k->rsa with loaded key */

prv = key_new(KEY_UNSPEC);

if (k->type == KEY_RSA || k->type == KEY_UNSPEC) {

prv->rsa = EVP_PKEY_get1_RSA(pk);

if (k->rsa != NULL)

prv->type = KEY_RSA;

RSA_free(k->rsa);

name = "rsa w/o comment";

k->rsa = EVP_PKEY_get1_RSA(pk);

k->type = KEY_RSA;

name = "rsa w/o comment";

success = 1;

#ifdef DEBUG_PK

RSA_print_fp(stderr, prv->rsa, 8);

RSA_print_fp(stderr, k->rsa, 8);

#endif

} else if (pk->type == EVP_PKEY_DSA &&

}

(type == KEY_UNSPEC||type==KEY_DSA)) {

} else if (pk->type == EVP_PKEY_DSA) {

prv = key_new(KEY_UNSPEC);

/* replace k->dsa with loaded key */

prv->dsa = EVP_PKEY_get1_DSA(pk);

if (k->type == KEY_DSA || k->type == KEY_UNSPEC) {

prv->type = KEY_DSA;

if (k->dsa != NULL)

name = "dsa w/o comment";

DSA_free(k->dsa);

k->dsa = EVP_PKEY_get1_DSA(pk);

k->type = KEY_DSA;

name = "dsa w/o comment";

#ifdef DEBUG_PK

DSA_print_fp(stderr, prv->dsa, 8);

DSA_print_fp(stderr, k->dsa, 8);

#endif

success = 1;

}

} else {

error("PEM_read_PrivateKey: mismatch or "

"unknown EVP_PKEY save_type %d", pk->save_type);

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fclose(fp);

if (pk != NULL)

EVP_PKEY_free(pk);

if (prv != NULL && commentp)

if (success && comment_return)

*commentp = xstrdup(name);

*comment_return = xstrdup(name);

debug("read PEM private key done: type %s",

debug("read SSH2 private key done: name %s success %d", name, success);

prv ? key_type(prv) : "<unknown>");

return success;

return prv;

}

static int

int

key_perm_ok(int fd, const char *filename)

load_private_key(const char *filename, const char *passphrase, Key *key,

char **comment_return)

{

int fd;

int ret = 0;

struct stat st;

if (fstat(fd, &st) < 0)

fd = open(filename, O_RDONLY);

if (fd < 0)

return 0;

* if a key owned by the user is accessed, then we check the

/* check owner and modes */

* permissions of the file. if the key owned by a different user,

if (fstat(fd, &st) < 0 ||

* then we don't care.

(st.st_uid != 0 && st.st_uid != getuid()) ||

(st.st_mode & 077) != 0) {

if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {

close(fd);

error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");

error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");

error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");

error("Permissions 0%3.3o for '%s' are too open.",

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.");

error("This private key will be ignored.");

return 0;

}

return 1;

switch (key->type) {

}

Key *

key_load_private_type(int type, const char *filename, const char *passphrase,

char **commentp)

{

int fd;

fd = open(filename, O_RDONLY);

if (fd < 0)

return NULL;

if (!key_perm_ok(fd, filename)) {

error("bad permissions: ignore key: %s", filename);

close(fd);

return NULL;

}

switch (type) {

case KEY_RSA1:

return key_load_private_rsa1(fd, filename, passphrase,

if (key->rsa->e != NULL) {

commentp);

BN_clear_free(key->rsa->e);

/* closes fd */

key->rsa->e = NULL;

}

if (key->rsa->n != NULL) {

BN_clear_free(key->rsa->n);

key->rsa->n = NULL;

}

ret = load_private_key_rsa1(fd, filename, passphrase,

key->rsa, comment_return);

break;

case KEY_DSA:

case KEY_RSA:

case KEY_UNSPEC:

return key_load_private_pem(fd, type, passphrase, commentp);

ret = load_private_key_ssh2(fd, passphrase, key, comment_return);

/* closes fd */

break;

default:

close(fd);

break;

}

return NULL;

close(fd);

return ret;

}

Key *

int

key_load_private(const char *filename, const char *passphrase,

do_load_public_key(const char *filename, Key *k, char **commentp)

char **commentp)

{

Key *pub, *prv;

int fd;

fd = open(filename, O_RDONLY);

if (fd < 0)

return NULL;

if (!key_perm_ok(fd, filename)) {

error("bad permissions: ignore key: %s", filename);

close(fd);

return NULL;

}

pub = key_load_public_rsa1(fd, filename, commentp);

lseek(fd, (off_t) 0, SEEK_SET); /* rewind */

if (pub == NULL) {

/* closes fd */

prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);

/* use the filename as a comment for PEM */

if (commentp && prv)

*commentp = xstrdup(filename);

} else {

/* it's a SSH v1 key if the public key part is readable */

key_free(pub);

/* closes fd */

prv = key_load_private_rsa1(fd, filename, passphrase, NULL);

}

return prv;

}

static int

key_try_load_public(Key *k, const char *filename, char **commentp)

{

FILE *f;

char line[4096];

char line[1024];

char *cp;

f = fopen(filename, "r");

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Line 552

while (fgets(line, sizeof(line), f)) {

line[sizeof(line)-1] = '\0';

cp = line;

switch (*cp) {

switch(*cp){

case '#':

case '\n':

case '\0':

Line 597

Line 575

return 0;

}

/* load public key from ssh v1 private or any pubkey file */

/* load public key from pubkey file */

Key *

int

key_load_public(const char *filename, char **commentp)

try_load_public_key(const char *filename, Key *k, char **commentp)

{

Key *pub;

char pub[MAXPATHLEN];

char file[MAXPATHLEN];

pub = key_load_public_type(KEY_RSA1, filename, commentp);

if (do_load_public_key(filename, k, commentp) == 1)

if (pub != NULL)

return 1;

return pub;

if (strlcpy(pub, filename, sizeof pub) >= MAXPATHLEN)

pub = key_new(KEY_UNSPEC);

return 0;

if (key_try_load_public(pub, filename, commentp) == 1)

if (strlcat(pub, ".pub", sizeof pub) >= MAXPATHLEN)

return pub;

return 0;

if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&

if (do_load_public_key(pub, k, commentp) == 1)

(strlcat(file, ".pub", sizeof file) < sizeof(file)) &&

return 1;

(key_try_load_public(pub, file, commentp) == 1))

return 0;

return pub;

key_free(pub);

return NULL;

}