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/* |
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* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
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* rsa.c: Functions for use with RSA public key cryptography. |
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* |
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* Copyright (C) 2002 by the past and present ircd coders, and others. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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* |
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* $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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|
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#include <openssl/pem.h> |
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#include <openssl/rand.h> |
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#include <openssl/rsa.h> |
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#include <openssl/bn.h> |
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#include <openssl/evp.h> |
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#include <openssl/err.h> |
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#include <openssl/opensslv.h> |
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|
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#include "memory.h" |
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#include "rsa.h" |
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#include "s_conf.h" |
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#include "s_log.h" |
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#include "client.h" /* CIPHERKEYLEN .. eww */ |
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#include "ircd.h" /* bio_spare_fd */ |
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|
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|
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/* |
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* report_crypto_errors - Dump crypto error list to log |
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*/ |
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void |
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report_crypto_errors(void) |
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{ |
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unsigned long e = 0; |
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unsigned long cnt = 0; |
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|
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ERR_load_crypto_strings(); |
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|
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while ((cnt < 100) && (e = ERR_get_error())) |
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{ |
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ilog(L_CRIT, "SSL error: %s", ERR_error_string(e, 0)); |
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cnt++; |
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} |
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} |
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|
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/* |
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* verify_private_key - reread private key and verify against inmem key |
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*/ |
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int |
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verify_private_key(void) |
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{ |
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BIO *file; |
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RSA *key; |
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RSA *mkey; |
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|
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/* If the rsa_private_key directive isn't found, error out. */ |
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if (ServerInfo.rsa_private_key == NULL) |
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{ |
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ilog(L_NOTICE, "rsa_private_key in serverinfo{} is not defined."); |
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return -1; |
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} |
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|
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/* If rsa_private_key_file isn't available, error out. */ |
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if (ServerInfo.rsa_private_key_file == NULL) |
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{ |
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ilog(L_NOTICE, "Internal error: rsa_private_key_file isn't defined."); |
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return -1; |
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} |
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|
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if (bio_spare_fd > -1) |
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close(bio_spare_fd); |
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|
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file = BIO_new_file(ServerInfo.rsa_private_key_file, "r"); |
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|
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/* |
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* If BIO_new_file returned NULL (according to OpenSSL docs), then |
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* an error occurred. |
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*/ |
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if (file == NULL) |
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{ |
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bio_spare_fd = save_spare_fd("SSL private key validation"); |
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ilog(L_NOTICE, "Failed to open private key file - can't validate it"); |
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return -1; |
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} |
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|
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key = PEM_read_bio_RSAPrivateKey(file, NULL, 0, NULL); |
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|
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if (key == NULL) |
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{ |
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ilog(L_NOTICE, "PEM_read_bio_RSAPrivateKey() failed; possibly not RSA?"); |
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report_crypto_errors(); |
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return -1; |
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} |
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|
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BIO_set_close(file, BIO_CLOSE); |
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BIO_free(file); |
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bio_spare_fd = save_spare_fd("SSL private key validation"); |
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|
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mkey = ServerInfo.rsa_private_key; |
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|
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/* |
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* Compare the in-memory key to the key we just loaded above. If |
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* any of the portions don't match, then logically we have a different |
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* in-memory key vs. the one we just loaded. This is bad, mmmkay? |
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*/ |
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if (mkey->pad != key->pad) |
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ilog(L_CRIT, "Private key corrupted: pad %i != pad %i", |
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mkey->pad, key->pad); |
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|
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if (mkey->version != key->version) |
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ilog(L_CRIT, "Private key corrupted: version %li != version %li", |
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mkey->version, key->version); |
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|
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if (BN_cmp(mkey->n, key->n)) |
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ilog(L_CRIT, "Private key corrupted: n differs"); |
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if (BN_cmp(mkey->e, key->e)) |
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ilog(L_CRIT, "Private key corrupted: e differs"); |
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if (BN_cmp(mkey->d, key->d)) |
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ilog(L_CRIT, "Private key corrupted: d differs"); |
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if (BN_cmp(mkey->p, key->p)) |
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ilog(L_CRIT, "Private key corrupted: p differs"); |
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if (BN_cmp(mkey->q, key->q)) |
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ilog(L_CRIT, "Private key corrupted: q differs"); |
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if (BN_cmp(mkey->dmp1, key->dmp1)) |
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ilog(L_CRIT, "Private key corrupted: dmp1 differs"); |
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if (BN_cmp(mkey->dmq1, key->dmq1)) |
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ilog(L_CRIT, "Private key corrupted: dmq1 differs"); |
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if (BN_cmp(mkey->iqmp, key->iqmp)) |
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ilog(L_CRIT, "Private key corrupted: iqmp differs"); |
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|
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RSA_free(key); |
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return 0; |
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} |
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|
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|
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static void |
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binary_to_hex(unsigned char *bin, char *hex, int length) |
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{ |
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static const char trans[] = "0123456789ABCDEF"; |
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int i; |
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|
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for (i = 0; i < length; i++) |
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{ |
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hex[i << 1] = trans[bin[i] >> 4]; |
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hex[(i << 1) + 1] = trans[bin[i] & 0xf]; |
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} |
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|
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hex[i << 1] = '\0'; |
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} |
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|
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int |
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get_randomness(unsigned char *buf, int length) |
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{ |
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/* Seed OpenSSL PRNG with EGD enthropy pool -kre */ |
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if (ConfigFileEntry.use_egd && |
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(ConfigFileEntry.egdpool_path != NULL)) |
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{ |
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if (RAND_egd(ConfigFileEntry.egdpool_path) == -1) |
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return -1; |
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} |
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|
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if (RAND_status()) |
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return (RAND_bytes(buf, length)); |
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else /* XXX - abort? */ |
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return (RAND_pseudo_bytes(buf, length)); |
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} |
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|
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int |
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generate_challenge(char **r_challenge, char **r_response, RSA *rsa) |
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{ |
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unsigned char secret[32], *tmp; |
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unsigned long length; |
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int ret = -1; |
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|
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if (!rsa) |
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return -1; |
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get_randomness(secret, 32); |
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*r_response = MyMalloc(65); |
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binary_to_hex(secret, *r_response, 32); |
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|
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length = RSA_size(rsa); |
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tmp = MyMalloc(length); |
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ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING); |
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|
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*r_challenge = MyMalloc((length << 1) + 1); |
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binary_to_hex( tmp, *r_challenge, length); |
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(*r_challenge)[length<<1] = 0; |
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MyFree(tmp); |
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|
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if (ret < 0) |
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{ |
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report_crypto_errors(); |
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return -1; |
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} |
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return 0; |
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} |