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/* Module for encryption using the Unix crypt() function. |
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* |
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* IRC Services is copyright (c) 1996-2009 Andrew Church. |
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* E-mail: <achurch@achurch.org> |
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* Parts written by Andrew Kempe and others. |
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* This program is free but copyrighted software; see the file GPL.txt for |
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* details. |
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*/ |
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|
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#include "services.h" |
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#include "modules.h" |
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#include "conffile.h" |
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#include "encrypt.h" |
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|
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#if !HAVE_CRYPT |
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# define crypt(pass,salt) NULL |
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#endif |
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|
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/*************************************************************************/ |
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|
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/* Allowable characters in the salt */ |
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const char saltchars[] = |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789./"; |
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|
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/*************************************************************************/ |
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/*************************************************************************/ |
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|
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static int unixcrypt_encrypt(const char *src, int len, char *dest, int size) |
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{ |
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char buf[PASSMAX+1], salt[3]; |
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const char *res; |
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|
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if (len > sizeof(buf)-1) |
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len = sizeof(buf)-1; |
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memcpy(buf, src, len); |
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buf[len] = 0; |
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salt[0] = saltchars[random()%64]; |
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salt[1] = saltchars[random()%64]; |
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salt[2] = 0; |
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res = crypt(buf, salt); |
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if (!res) { |
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module_log_perror("encrypt: crypt() failed"); |
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return -1; |
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} |
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if (strlen(res) > size-1) { |
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module_log("encrypt: crypt() returned too long a string! (%d" |
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" characters)", (int)strlen(res)); |
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return strlen(res) + 1; |
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} |
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strscpy(dest, res, size); |
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return 0; |
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} |
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|
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/*************************************************************************/ |
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|
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static int unixcrypt_decrypt(const char *src, char *dest, int size) |
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{ |
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return -2; /* decryption impossible (in reasonable time) */ |
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} |
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|
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/*************************************************************************/ |
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|
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static int unixcrypt_check_password(const char *plaintext, const char *password) |
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{ |
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const char *res; |
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|
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res = crypt(plaintext, password); |
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if (!res) { |
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module_log_perror("check_password: crypt() failed"); |
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return -1; |
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} |
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if (strcmp(res, password) == 0) |
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return 1; |
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return 0; |
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} |
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|
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/*************************************************************************/ |
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/*************************************************************************/ |
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|
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/* Module stuff. */ |
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|
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ConfigDirective module_config[] = { |
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{ NULL } |
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}; |
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|
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static CipherInfo unixcrypt_info = { |
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.name = "unix-crypt", |
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.encrypt = unixcrypt_encrypt, |
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.decrypt = unixcrypt_decrypt, |
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.check_password = unixcrypt_check_password, |
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}; |
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|
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int init_module(void) |
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{ |
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#if !HAVE_CRYPT |
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module_log("Your system does not support the crypt() function!"); |
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return 0; |
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#else |
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if (PASSMAX < 14) { |
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module_log("PASSMAX too small (must be at least 14)"); |
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return 0; |
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} |
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register_cipher(&unixcrypt_info); |
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return 1; |
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#endif |
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} |
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|
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int exit_module(int shutdown_unused) |
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{ |
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unregister_cipher(&unixcrypt_info); |
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return 1; |
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} |
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|
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/*************************************************************************/ |
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|
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/* |
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* Local variables: |
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* c-file-style: "stroustrup" |
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* c-file-offsets: ((case-label . *) (statement-case-intro . *)) |
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* indent-tabs-mode: nil |
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* End: |
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* |
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* vim: expandtab shiftwidth=4: |
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*/ |
