elemental-ircd/extensions/m_mkpasswd.c

218 lines
4.6 KiB
C

/*
* m_mkpasswd.c: Encrypts a password online.
*
* Based on mkpasswd.c, originally by Nelson Minar (minar@reed.edu)
* You can use this code in any way as long as these names remain.
*
*/
#include "stdinc.h"
#include "client.h"
#include "numeric.h"
#include "s_conf.h"
#include "modules.h"
#include <string.h>
static int m_mkpasswd(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[]);
static int mo_mkpasswd(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[]);
static char *make_md5_salt(int);
static char *make_sha256_salt(int);
static char *make_sha512_salt(int);
static char *generate_random_salt(char *, int);
static char *generate_poor_salt(char *, int);
static char saltChars[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
/* 0 .. 63, ascii - 64 */
struct Message mkpasswd_msgtab = {
"MKPASSWD", 0, 0, 0, MFLG_SLOW,
{mg_unreg, {m_mkpasswd, 2}, mg_ignore, mg_ignore, mg_ignore, {mo_mkpasswd, 2}}
};
mapi_clist_av1 mkpasswd_clist[] = { &mkpasswd_msgtab, NULL };
DECLARE_MODULE_AV1(mkpasswd, NULL, NULL, mkpasswd_clist, NULL, NULL, "$Revision$");
/* m_mkpasswd - mkpasswd message handler
* parv[1] = password
* parv[2] = type
*/
static int
m_mkpasswd(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
static time_t last_used = 0;
char *salt;
const char *hashtype;
const char hashdefault[] = "SHA512";
if(EmptyString(parv[1]))
{
sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS), me.name, source_p->name, "MKPASSWD");
return 0;
}
if(parc < 3)
hashtype = hashdefault;
else
hashtype = parv[2];
if((last_used + ConfigFileEntry.pace_wait) > rb_current_time())
{
/* safe enough to give this on a local connect only */
sendto_one(source_p, form_str(RPL_LOAD2HI), me.name, source_p->name, "MKPASSWD");
return 0;
}
else
last_used = rb_current_time();
if(!irccmp(hashtype, "SHA256"))
salt = make_sha256_salt(16);
else if(!irccmp(hashtype, "SHA512"))
salt = make_sha512_salt(16);
else if(!irccmp(hashtype, "MD5"))
salt = make_md5_salt(8);
else
{
sendto_one_notice(source_p,
":MKPASSWD syntax error: MKPASSWD pass [SHA256|SHA512|MD5]");
return 0;
}
sendto_one_notice(source_p, ":Hash [%s] for %s: %s", hashtype, parv[1], rb_crypt(parv[1], salt));
return 0;
}
/* mo_mkpasswd - mkpasswd message handler
* parv[1] = password
* parv[2] = type
*/
static int
mo_mkpasswd(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
char *salt;
const char *hashtype;
const char hashdefault[] = "SHA512";
if(EmptyString(parv[1]))
{
sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS), me.name, source_p->name, "MKPASSWD");
return 0;
}
if(parc < 3)
hashtype = hashdefault;
else
hashtype = parv[2];
if(!irccmp(hashtype, "SHA256"))
salt = make_sha256_salt(16);
else if(!irccmp(hashtype, "SHA512"))
salt = make_sha512_salt(16);
else if(!irccmp(hashtype, "MD5"))
salt = make_md5_salt(8);
else
{
sendto_one_notice(source_p,
":MKPASSWD syntax error: MKPASSWD pass [SHA256|SHA512|MD5]");
return 0;
}
sendto_one_notice(source_p, ":Hash [%s] for %s: %s", hashtype, parv[1], rb_crypt(parv[1], salt));
return 0;
}
char *
make_md5_salt(int length)
{
static char salt[21];
if(length > 16)
{
printf("MD5 salt length too long\n");
exit(0);
}
salt[0] = '$';
salt[1] = '1';
salt[2] = '$';
generate_random_salt(&salt[3], length);
salt[length + 3] = '$';
salt[length + 4] = '\0';
return salt;
}
char *
make_sha256_salt(int length)
{
static char salt[21];
if(length > 16)
{
printf("SHA256 salt length too long\n");
exit(0);
}
salt[0] = '$';
salt[1] = '5';
salt[2] = '$';
generate_random_salt(&salt[3], length);
salt[length + 3] = '$';
salt[length + 4] = '\0';
return salt;
}
char *
make_sha512_salt(int length)
{
static char salt[21];
if(length > 16)
{
printf("SHA512 salt length too long\n");
exit(0);
}
salt[0] = '$';
salt[1] = '6';
salt[2] = '$';
generate_random_salt(&salt[3], length);
salt[length + 3] = '$';
salt[length + 4] = '\0';
return salt;
}
char *
generate_poor_salt(char *salt, int length)
{
int i;
srand(time(NULL));
for(i = 0; i < length; i++)
{
salt[i] = saltChars[rand() % 64];
}
return (salt);
}
char *
generate_random_salt(char *salt, int length)
{
char *buf;
int fd, i;
if((fd = open("/dev/random", O_RDONLY)) < 0)
{
return (generate_poor_salt(salt, length));
}
buf = calloc(1, length);
if(read(fd, buf, length) != length)
{
free(buf);
return (generate_poor_salt(salt, length));
}
for(i = 0; i < length; i++)
{
salt[i] = saltChars[abs(buf[i]) % 64];
}
free(buf);
return (salt);
}