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asterisk/res/res_crypto.c

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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Provide Cryptographic Signature capability
*
* \author Mark Spencer <markster@digium.com>
*
* Uses the OpenSSL library, available at
* http://www.openssl.org/
*/
/*** MODULEINFO
<depend>openssl</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <dirent.h> /* for closedir, opendir, readdir, DIR */
#include <openssl/err.h> /* for ERR_print_errors_fp */
#include <openssl/ssl.h> /* for NID_sha1, RSA */
#include <openssl/evp.h> /* for EVP_PKEY, EVP_sha1(), ... */
#include <openssl/md5.h> /* for MD5_DIGEST_LENGTH */
#include <openssl/sha.h> /* for SHA_DIGEST_LENGTH */
#include "asterisk/cli.h" /* for ast_cli, ast_cli_args, ast_cli_entry */
#include "asterisk/compat.h" /* for strcasecmp */
#include "asterisk/io.h" /* for ast_hide_password, ast_restore_tty */
#include "asterisk/linkedlists.h" /* for AST_RWLIST_TRAVERSE, AST_RWLIST_U... */
#include "asterisk/logger.h" /* for ast_log, LOG_WARNING, LOG_NOTICE */
#include "asterisk/md5.h" /* for MD5Final, MD5Init, MD5Update, MD5... */
#include "asterisk/module.h" /* for ast_module_flags::AST_MODFLAG_GLO... */
#include "asterisk/options.h" /* for ast_opt_init_keys */
#include "asterisk/paths.h" /* for ast_config_AST_KEY_DIR */
#include "asterisk/utils.h" /* for ast_copy_string, ast_base64decode */
#define AST_API_MODULE
#include "asterisk/crypto.h" /* for AST_KEY_PUBLIC, AST_KEY_PRIVATE */
/*
* Asterisk uses RSA keys with SHA-1 message digests for its
* digital signatures. The choice of RSA is due to its higher
* throughput on verification, and the choice of SHA-1 based
* on the recently discovered collisions in MD5's compression
* algorithm and recommendations of avoiding MD5 in new schemes
* from various industry experts.
*
* We use OpenSSL to provide our crypto routines, although we never
* actually use full-up SSL
*
*/
#define KEY_NEEDS_PASSCODE (1 << 16)
/* From RFC-2437, section 9.1.1 the padding size is 1+2*hLen, where
* the hLen for SHA-1 is 20 bytes (or 160 bits).
*/
#define RSA_PKCS1_OAEP_PADDING_SIZE (1 + 2 * SHA_DIGEST_LENGTH)
struct ast_key {
/*! Name of entity */
char name[80];
/*! File name */
char fn[256];
/*! Key type (AST_KEY_PUB or AST_KEY_PRIV, along with flags from above) */
int ktype;
/*! RSA key structure (if successfully loaded) */
EVP_PKEY *pkey;
/*! Whether we should be deleted */
int delme;
/*! FD for input (or -1 if no input allowed, or -2 if we needed input) */
int infd;
/*! FD for output */
int outfd;
/*! Last MD5 Digest */
unsigned char digest[MD5_DIGEST_LENGTH];
AST_RWLIST_ENTRY(ast_key) list;
};
static AST_RWLIST_HEAD_STATIC(keys, ast_key);
static void crypto_load(int ifd, int ofd);
/*!
* \brief setting of priv key
* \param buf
* \param size
* \param rwflag
* \param userdata
* \return length of string,-1 on failure
*/
static int pw_cb(char *buf, int size, int rwflag, void *userdata)
{
struct ast_key *key = (struct ast_key *)userdata;
char prompt[256];
int tmp;
int res;
if (key->infd < 0) {
/* Note that we were at least called */
key->infd = -2;
return -1;
}
snprintf(prompt, sizeof(prompt), ">>>> passcode for %s key '%s': ",
key->ktype == AST_KEY_PRIVATE ? "PRIVATE" : "PUBLIC", key->name);
if (write(key->outfd, prompt, strlen(prompt)) < 0) {
ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
key->infd = -2;
return -1;
}
tmp = ast_hide_password(key->infd);
memset(buf, 0, size);
res = read(key->infd, buf, size);
if (res == -1) {
ast_log(LOG_WARNING, "read() failed: %s\n", strerror(errno));
}
ast_restore_tty(key->infd, tmp);
if (buf[strlen(buf) -1] == '\n') {
buf[strlen(buf) - 1] = '\0';
}
return strlen(buf);
}
/*!
* \brief return the ast_key structure for name
* \see ast_key_get
*/
struct ast_key * AST_OPTIONAL_API_NAME(ast_key_get)(const char *kname, int ktype)
{
struct ast_key *key;
AST_RWLIST_RDLOCK(&keys);
AST_RWLIST_TRAVERSE(&keys, key, list) {
if (!strcmp(kname, key->name) &&
(ktype == key->ktype)) {
break;
}
}
AST_RWLIST_UNLOCK(&keys);
return key;
}
/*!
* \brief load RSA key from file
* \param dir directory string
* \param fname name of file
* \param ifd incoming file descriptor
* \param ofd outgoing file descriptor
* \param not2
* \return key on success.
* \retval NULL on failure.
*/
static struct ast_key *try_load_key(const char *dir, const char *fname, int ifd, int ofd, int *not2)
{
int ktype = 0, found = 0;
char *c = NULL, ffname[256];
unsigned char digest[MD5_DIGEST_LENGTH];
unsigned digestlen;
FILE *f;
EVP_MD_CTX *ctx = NULL;
struct ast_key *key;
static int notice = 0;
/* Make sure its name is a public or private key */
if ((c = strstr(fname, ".pub")) && !strcmp(c, ".pub")) {
ktype = AST_KEY_PUBLIC;
} else if ((c = strstr(fname, ".key")) && !strcmp(c, ".key")) {
ktype = AST_KEY_PRIVATE;
} else {
return NULL;
}
/* Get actual filename */
snprintf(ffname, sizeof(ffname), "%s/%s", dir, fname);
/* Open file */
if (!(f = fopen(ffname, "r"))) {
ast_log(LOG_WARNING, "Unable to open key file %s: %s\n", ffname, strerror(errno));
return NULL;
}
ctx = EVP_MD_CTX_create();
if (ctx == NULL) {
ast_log(LOG_ERROR, "Out of memory\n");
fclose(f);
return NULL;
}
EVP_DigestInit(ctx, EVP_md5());
while (!feof(f)) {
/* Calculate a "whatever" quality md5sum of the key */
char buf[256] = "";
if (!fgets(buf, sizeof(buf), f)) {
continue;
}
if (!feof(f)) {
EVP_DigestUpdate(ctx, (unsigned char *)buf, strlen(buf));
}
}
EVP_DigestFinal(ctx, digest, &digestlen);
EVP_MD_CTX_destroy(ctx);
/* Look for an existing key */
AST_RWLIST_TRAVERSE(&keys, key, list) {
if (!strcasecmp(key->fn, ffname)) {
break;
}
}
if (key) {
/* If the MD5 sum is the same, and it isn't awaiting a passcode
then this is far enough */
if (!memcmp(digest, key->digest, sizeof(digest)) &&
!(key->ktype & KEY_NEEDS_PASSCODE)) {
fclose(f);
key->delme = 0;
return NULL;
} else {
/* Preserve keytype */
ktype = key->ktype;
/* Recycle the same structure */
found++;
}
}
/* Make fname just be the normal name now */
*c = '\0';
if (!key) {
if (!(key = ast_calloc(1, sizeof(*key)))) {
fclose(f);
return NULL;
}
}
/* First the filename */
ast_copy_string(key->fn, ffname, sizeof(key->fn));
/* Then the name */
ast_copy_string(key->name, fname, sizeof(key->name));
key->ktype = ktype;
/* Yes, assume we're going to be deleted */
key->delme = 1;
/* Keep the key type */
memcpy(key->digest, digest, sizeof(key->digest));
/* Can I/O takes the FD we're given */
key->infd = ifd;
key->outfd = ofd;
/* Reset the file back to the beginning */
rewind(f);
/* Now load the key with the right method */
if (ktype == AST_KEY_PUBLIC) {
PEM_read_PUBKEY(f, &key->pkey, pw_cb, key);
} else {
PEM_read_PrivateKey(f, &key->pkey, pw_cb, key);
}
fclose(f);
if (key->pkey) {
if (EVP_PKEY_size(key->pkey) == (AST_CRYPTO_RSA_KEY_BITS / 8)) {
/* Key loaded okay */
key->ktype &= ~KEY_NEEDS_PASSCODE;
ast_verb(3, "Loaded %s key '%s'\n", key->ktype == AST_KEY_PUBLIC ? "PUBLIC" : "PRIVATE", key->name);
ast_debug(1, "Key '%s' loaded OK\n", key->name);
key->delme = 0;
} else {
ast_log(LOG_NOTICE, "Key '%s' is not expected size.\n", key->name);
}
} else if (key->infd != -2) {
ast_log(LOG_WARNING, "Key load %s '%s' failed\n", key->ktype == AST_KEY_PUBLIC ? "PUBLIC" : "PRIVATE", key->name);
if (ofd > -1) {
ERR_print_errors_fp(stderr);
} else {
ERR_print_errors_fp(stderr);
}
} else {
ast_log(LOG_NOTICE, "Key '%s' needs passcode.\n", key->name);
key->ktype |= KEY_NEEDS_PASSCODE;
if (!notice) {
if (!ast_opt_init_keys) {
ast_log(LOG_NOTICE, "Add the '-i' flag to the asterisk command line if you want to automatically initialize passcodes at launch.\n");
}
notice++;
}
/* Keep it anyway */
key->delme = 0;
/* Print final notice about "keys init" when done */
*not2 = 1;
}
/* If this is a new key add it to the list */
if (!found) {
AST_RWLIST_INSERT_TAIL(&keys, key, list);
}
return key;
}
static int evp_pkey_sign(EVP_PKEY *pkey, const unsigned char *in, unsigned inlen, unsigned char *sig, unsigned *siglen, unsigned padding)
{
EVP_PKEY_CTX *ctx = NULL;
int res = -1;
size_t _siglen;
if (*siglen < EVP_PKEY_size(pkey)) {
return -1;
}
if ((ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) {
return -1;
}
do {
if ((res = EVP_PKEY_sign_init(ctx)) <= 0) {
break;
}
if ((res = EVP_PKEY_CTX_set_rsa_padding(ctx, padding)) <= 0) {
break;
}
if ((res = EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha1())) <= 0) {
break;
}
_siglen = *siglen;
if ((res = EVP_PKEY_sign(ctx, sig, &_siglen, in, inlen)) <= 0) {
break;
}
*siglen = _siglen;
} while (0);
EVP_PKEY_CTX_free(ctx);
return res;
}
/*!
* \brief signs outgoing message with public key
* \see ast_sign_bin
*/
int AST_OPTIONAL_API_NAME(ast_sign_bin)(struct ast_key *key, const char *msg, int msglen, unsigned char *dsig)
{
unsigned char digest[SHA_DIGEST_LENGTH];
unsigned digestlen, siglen = 128;
int res;
EVP_MD_CTX *ctx = NULL;
if (key->ktype != AST_KEY_PRIVATE) {
ast_log(LOG_WARNING, "Cannot sign with a public key\n");
return -1;
}
if (siglen < EVP_PKEY_size(key->pkey)) {
ast_log(LOG_WARNING, "Signature buffer too small\n");
return -1;
}
/* Calculate digest of message */
ctx = EVP_MD_CTX_create();
if (ctx == NULL) {
ast_log(LOG_ERROR, "Out of memory\n");
return -1;
}
EVP_DigestInit(ctx, EVP_sha1());
EVP_DigestUpdate(ctx, msg, msglen);
EVP_DigestFinal(ctx, digest, &digestlen);
EVP_MD_CTX_destroy(ctx);
/* Verify signature */
if ((res = evp_pkey_sign(key->pkey, digest, sizeof(digest), dsig, &siglen, RSA_PKCS1_PADDING)) <= 0) {
ast_log(LOG_WARNING, "RSA Signature (key %s) failed %d\n", key->name, res);
return -1;
}
if (siglen != EVP_PKEY_size(key->pkey)) {
ast_log(LOG_WARNING, "Unexpected signature length %u, expecting %d\n", siglen, EVP_PKEY_size(key->pkey));
return -1;
}
return 0;
}
static int evp_pkey_decrypt(EVP_PKEY *pkey, const unsigned char *in, unsigned inlen, unsigned char *out, unsigned *outlen, unsigned padding)
{
EVP_PKEY_CTX *ctx = NULL;
int res = -1;
size_t _outlen;
if (*outlen < EVP_PKEY_size(pkey)) {
return -1;
}
if (inlen != EVP_PKEY_size(pkey)) {
return -1;
}
if ((ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) {
return -1;
}
do {
if ((res = EVP_PKEY_decrypt_init(ctx)) <= 0) {
break;
}
if ((res = EVP_PKEY_CTX_set_rsa_padding(ctx, padding)) <= 0) {
break;
}
_outlen = *outlen;
if ((res = EVP_PKEY_decrypt(ctx, out, &_outlen, in, inlen)) <= 0) {
break;
}
res = *outlen = _outlen;
} while (0);
EVP_PKEY_CTX_free(ctx);
return res;
}
/*!
* \brief decrypt a message
* \see ast_decrypt_bin
*/
int AST_OPTIONAL_API_NAME(ast_decrypt_bin)(unsigned char *dst, const unsigned char *src, int srclen, struct ast_key *key)
{
int res;
unsigned pos = 0, dstlen, blocksize;
if (key->ktype != AST_KEY_PRIVATE) {
ast_log(LOG_WARNING, "Cannot decrypt with a public key\n");
return -1;
}
blocksize = EVP_PKEY_size(key->pkey);
if (srclen % blocksize) {
ast_log(LOG_NOTICE, "Tried to decrypt something not a multiple of %u bytes\n", blocksize);
return -1;
}
while (srclen > 0) {
/* Process chunks 128 bytes at a time */
dstlen = blocksize;
if ((res = evp_pkey_decrypt(key->pkey, src, blocksize, dst, &dstlen, RSA_PKCS1_OAEP_PADDING)) <= 0) {
return -1;
}
pos += dstlen;
src += blocksize;
srclen -= blocksize;
dst += dstlen;
}
return pos;
}
static int evp_pkey_encrypt(EVP_PKEY *pkey, const unsigned char *in, unsigned inlen, unsigned char *out, unsigned *outlen, unsigned padding)
{
EVP_PKEY_CTX *ctx = NULL;
int res = -1;
size_t _outlen;
if (padding != RSA_PKCS1_OAEP_PADDING) {
ast_log(LOG_WARNING, "Only OAEP padding is supported for now\n");
return -1;
}
if (inlen > EVP_PKEY_size(pkey) - RSA_PKCS1_OAEP_PADDING_SIZE) {
return -1;
}
if (*outlen < EVP_PKEY_size(pkey)) {
return -1;
}
do {
if ((ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) {
break;
}
if ((res = EVP_PKEY_encrypt_init(ctx)) <= 0) {
break;
}
if ((res = EVP_PKEY_CTX_set_rsa_padding(ctx, padding)) <= 0) {
break;
}
_outlen = *outlen;
if ((res = EVP_PKEY_encrypt(ctx, out, &_outlen, in, inlen)) <= 0) {
break;
}
res = *outlen = _outlen;
} while (0);
EVP_PKEY_CTX_free(ctx);
return res;
}
/*!
* \brief encrypt a message
* \see ast_encrypt_bin
*/
int AST_OPTIONAL_API_NAME(ast_encrypt_bin)(unsigned char *dst, const unsigned char *src, int srclen, struct ast_key *key)
{
unsigned bytes, pos = 0, dstlen, blocksize;
int res;
if (key->ktype != AST_KEY_PUBLIC) {
ast_log(LOG_WARNING, "Cannot encrypt with a private key\n");
return -1;
}
blocksize = EVP_PKEY_size(key->pkey);
while (srclen) {
bytes = srclen;
if (bytes > blocksize - RSA_PKCS1_OAEP_PADDING_SIZE) {
bytes = blocksize - RSA_PKCS1_OAEP_PADDING_SIZE;
}
/* Process chunks 128-41 bytes at a time */
dstlen = blocksize;
if ((res = evp_pkey_encrypt(key->pkey, src, bytes, dst, &dstlen, RSA_PKCS1_OAEP_PADDING)) != blocksize) {
ast_log(LOG_NOTICE, "How odd, encrypted size is %d\n", res);
return -1;
}
src += bytes;
srclen -= bytes;
pos += dstlen;
dst += dstlen;
}
return pos;
}
/*!
* \brief wrapper for __ast_sign_bin then base64 encode it
* \see ast_sign
*/
int AST_OPTIONAL_API_NAME(ast_sign)(struct ast_key *key, char *msg, char *sig)
{
/* assumes 1024 bit RSA key size */
unsigned char dsig[128];
int siglen = sizeof(dsig), res;
if (!(res = ast_sign_bin(key, msg, strlen(msg), dsig))) {
/* Success -- encode (256 bytes max as documented) */
ast_base64encode(sig, dsig, siglen, 256);
}
return res;
}
static int evp_pkey_verify(EVP_PKEY *pkey, const unsigned char *in, unsigned inlen, const unsigned char *sig, unsigned siglen, unsigned padding)
{
EVP_PKEY_CTX *ctx = NULL;
int res = -1;
if (siglen < EVP_PKEY_size(pkey)) {
return -1;
}
if ((ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) {
return -1;
}
do {
if ((res = EVP_PKEY_verify_init(ctx)) <= 0) {
break;
}
if ((res = EVP_PKEY_CTX_set_rsa_padding(ctx, padding)) <= 0) {
break;
}
if ((res = EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha1())) <= 0) {
break;
}
if ((res = EVP_PKEY_verify(ctx, sig, siglen, in, inlen)) <= 0) {
break;
}
} while (0);
EVP_PKEY_CTX_free(ctx);
return res;
}
/*!
* \brief check signature of a message
* \see ast_check_signature_bin
*/
int AST_OPTIONAL_API_NAME(ast_check_signature_bin)(struct ast_key *key, const char *msg, int msglen, const unsigned char *dsig)
{
unsigned char digest[SHA_DIGEST_LENGTH];
unsigned digestlen;
int res;
EVP_MD_CTX *ctx = NULL;
if (key->ktype != AST_KEY_PUBLIC) {
/* Okay, so of course you really *can* but for our purposes
we're going to say you can't */
ast_log(LOG_WARNING, "Cannot check message signature with a private key\n");
return -1;
}
/* Calculate digest of message */
ctx = EVP_MD_CTX_create();
if (ctx == NULL) {
ast_log(LOG_ERROR, "Out of memory\n");
return -1;
}
EVP_DigestInit(ctx, EVP_sha1());
EVP_DigestUpdate(ctx, msg, msglen);
EVP_DigestFinal(ctx, digest, &digestlen);
EVP_MD_CTX_destroy(ctx);
/* Verify signature */
if (!(res = evp_pkey_verify(key->pkey, (const unsigned char *)digest, sizeof(digest), (unsigned char *)dsig, 128, RSA_PKCS1_PADDING))) {
ast_debug(1, "Key failed verification: %s\n", key->name);
return -1;
}
/* Pass */
return 0;
}
/*!
* \brief base64 decode then sent to __ast_check_signature_bin
* \see ast_check_signature
*/
int AST_OPTIONAL_API_NAME(ast_check_signature)(struct ast_key *key, const char *msg, const char *sig)
{
unsigned char dsig[128];
int res;
/* Decode signature */
if ((res = ast_base64decode(dsig, sig, sizeof(dsig))) != sizeof(dsig)) {
ast_log(LOG_WARNING, "Signature improper length (expect %d, got %d)\n", (int)sizeof(dsig), (int)res);
return -1;
}
res = ast_check_signature_bin(key, msg, strlen(msg), dsig);
return res;
}
int AST_OPTIONAL_API_NAME(ast_crypto_loaded)(void)
{
return 1;
}
int AST_OPTIONAL_API_NAME(ast_crypto_reload)(void)
{
crypto_load(-1, -1);
return 1;
}
int AST_OPTIONAL_API_NAME(ast_aes_set_encrypt_key)(const unsigned char *key, ast_aes_encrypt_key *ctx)
{
if (key == NULL || ctx == NULL) {
return -1;
}
memcpy(ctx->raw, key, AST_CRYPTO_AES_BLOCKSIZE / 8);
return 0;
}
int AST_OPTIONAL_API_NAME(ast_aes_set_decrypt_key)(const unsigned char *key, ast_aes_decrypt_key *ctx)
{
if (key == NULL || ctx == NULL) {
return -1;
}
memcpy(ctx->raw, key, AST_CRYPTO_AES_BLOCKSIZE / 8);
return 0;
}
static int evp_cipher_aes_encrypt(const unsigned char *in, unsigned char *out, unsigned inlen, const ast_aes_encrypt_key *key)
{
EVP_CIPHER_CTX *ctx = NULL;
int res, outlen, finallen;
unsigned char final[AST_CRYPTO_AES_BLOCKSIZE / 8];
if ((ctx = EVP_CIPHER_CTX_new()) == NULL) {
return -1;
}
do {
if ((res = EVP_CipherInit(ctx, EVP_aes_128_ecb(), key->raw, NULL, 1)) <= 0) {
break;
}
EVP_CIPHER_CTX_set_padding(ctx, 0);
if ((res = EVP_CipherUpdate(ctx, out, &outlen, in, inlen)) <= 0) {
break;
}
/* for ECB, this is a no-op */
if ((res = EVP_CipherFinal(ctx, final, &finallen)) <= 0) {
break;
}
res = outlen;
} while (0);
EVP_CIPHER_CTX_free(ctx);
return res;
}
int AST_OPTIONAL_API_NAME(ast_aes_encrypt)(const unsigned char *in, unsigned char *out, const ast_aes_encrypt_key *key)
{
int res;
if ((res = evp_cipher_aes_encrypt(in, out, AST_CRYPTO_AES_BLOCKSIZE / 8, key)) <= 0) {
ast_log(LOG_ERROR, "AES encryption failed\n");
}
return res;
}
static int evp_cipher_aes_decrypt(const unsigned char *in, unsigned char *out, unsigned inlen, const ast_aes_decrypt_key *key)
{
EVP_CIPHER_CTX *ctx = NULL;
int res, outlen, finallen;
unsigned char final[AST_CRYPTO_AES_BLOCKSIZE / 8];
if ((ctx = EVP_CIPHER_CTX_new()) == NULL) {
return -1;
}
do {
if ((res = EVP_CipherInit(ctx, EVP_aes_128_ecb(), key->raw, NULL, 0)) <= 0) {
break;
}
EVP_CIPHER_CTX_set_padding(ctx, 0);
if ((res = EVP_CipherUpdate(ctx, out, &outlen, in, inlen)) <= 0) {
break;
}
/* for ECB, this is a no-op */
if ((res = EVP_CipherFinal(ctx, final, &finallen)) <= 0) {
break;
}
res = outlen;
} while (0);
EVP_CIPHER_CTX_free(ctx);
return res;
}
int AST_OPTIONAL_API_NAME(ast_aes_decrypt)(const unsigned char *in, unsigned char *out, const ast_aes_decrypt_key *key)
{
int res;
if ((res = evp_cipher_aes_decrypt(in, out, AST_CRYPTO_AES_BLOCKSIZE / 8, key)) <= 0) {
ast_log(LOG_ERROR, "AES decryption failed\n");
}
return res;
}
/*!
* \brief refresh RSA keys from file
* \param ifd file descriptor
* \param ofd file descriptor
*/
static void crypto_load(int ifd, int ofd)
{
struct ast_key *key;
DIR *dir = NULL;
struct dirent *ent;
int note = 0;
AST_RWLIST_WRLOCK(&keys);
/* Mark all keys for deletion */
AST_RWLIST_TRAVERSE(&keys, key, list) {
key->delme = 1;
}
/* Load new keys */
if ((dir = opendir(ast_config_AST_KEY_DIR))) {
while ((ent = readdir(dir))) {
if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..")) {
continue;
}
if (ent->d_type != DT_REG) {
ast_log(LOG_WARNING, "Non-regular file '%s' in keys directory\n", ent->d_name);
continue;
}
try_load_key(ast_config_AST_KEY_DIR, ent->d_name, ifd, ofd, &note);
}
closedir(dir);
} else {
ast_log(LOG_WARNING, "Unable to open key directory '%s'\n", ast_config_AST_KEY_DIR);
}
if (note) {
ast_log(LOG_NOTICE, "Please run the command 'keys init' to enter the passcodes for the keys\n");
}
/* Delete any keys that are no longer present */
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&keys, key, list) {
if (key->delme) {
ast_debug(1, "Deleting key %s type %d\n", key->name, key->ktype);
AST_RWLIST_REMOVE_CURRENT(list);
if (key->pkey) {
EVP_PKEY_free(key->pkey);
}
ast_free(key);
}
}
AST_RWLIST_TRAVERSE_SAFE_END;
AST_RWLIST_UNLOCK(&keys);
}
static void md52sum(char *sum, unsigned char *md5)
{
int x;
for (x = 0; x < MD5_DIGEST_LENGTH; x++) {
sum += sprintf(sum, "%02hhx", *(md5++));
}
}
/*!
* \brief show the list of RSA keys
* \param e CLI command
* \param cmd
* \param a list of CLI arguments
* \retval CLI_SUCCESS
*/
static char *handle_cli_keys_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
#define FORMAT "%-18s %-8s %-16s %-33s\n"
struct ast_key *key;
char sum[MD5_DIGEST_LENGTH * 2 + 1];
int count_keys = 0;
switch (cmd) {
case CLI_INIT:
e->command = "keys show";
e->usage =
"Usage: keys show\n"
" Displays information about RSA keys known by Asterisk\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
ast_cli(a->fd, FORMAT, "Key Name", "Type", "Status", "Sum");
ast_cli(a->fd, FORMAT, "------------------", "--------", "----------------", "--------------------------------");
AST_RWLIST_RDLOCK(&keys);
AST_RWLIST_TRAVERSE(&keys, key, list) {
md52sum(sum, key->digest);
ast_cli(a->fd, FORMAT, key->name,
(key->ktype & 0xf) == AST_KEY_PUBLIC ? "PUBLIC" : "PRIVATE",
key->ktype & KEY_NEEDS_PASSCODE ? "[Needs Passcode]" : "[Loaded]", sum);
count_keys++;
}
AST_RWLIST_UNLOCK(&keys);
ast_cli(a->fd, "\n%d known RSA keys.\n", count_keys);
return CLI_SUCCESS;
#undef FORMAT
}
/*!
* \brief initialize all RSA keys
* \param e CLI command
* \param cmd
* \param a list of CLI arguments
* \retval CLI_SUCCESS
*/
static char *handle_cli_keys_init(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct ast_key *key;
int ign;
char *kn, tmp[256] = "";
switch (cmd) {
case CLI_INIT:
e->command = "keys init";
e->usage =
"Usage: keys init\n"
" Initializes private keys (by reading in pass code from\n"
" the user)\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
if (a->argc != 2) {
return CLI_SHOWUSAGE;
}
AST_RWLIST_WRLOCK(&keys);
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&keys, key, list) {
/* Reload keys that need pass codes now */
if (key->ktype & KEY_NEEDS_PASSCODE) {
kn = key->fn + strlen(ast_config_AST_KEY_DIR) + 1;
ast_copy_string(tmp, kn, sizeof(tmp));
try_load_key(ast_config_AST_KEY_DIR, tmp, a->fd, a->fd, &ign);
}
}
AST_RWLIST_TRAVERSE_SAFE_END
AST_RWLIST_UNLOCK(&keys);
return CLI_SUCCESS;
}
static struct ast_cli_entry cli_crypto[] = {
AST_CLI_DEFINE(handle_cli_keys_show, "Displays RSA key information"),
AST_CLI_DEFINE(handle_cli_keys_init, "Initialize RSA key passcodes")
};
/*! \brief initialise the res_crypto module */
static int crypto_init(void)
{
ast_cli_register_multiple(cli_crypto, ARRAY_LEN(cli_crypto));
return 0;
}
static int reload(void)
{
crypto_load(-1, -1);
return 0;
}
static int load_module(void)
{
crypto_init();
if (ast_opt_init_keys) {
crypto_load(STDIN_FILENO, STDOUT_FILENO);
} else {
crypto_load(-1, -1);
}
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
ast_cli_unregister_multiple(cli_crypto, ARRAY_LEN(cli_crypto));
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Cryptographic Digital Signatures",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.reload = reload,
.load_pri = AST_MODPRI_CHANNEL_DEPEND, /*!< Since we don't have a config file, we could move up to REALTIME_DEPEND, if necessary */
);
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