ticketauth/ticketauth.c

   1 /* ticketauth.c */
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <strings.h>
   6
   7 #include "../control/control.h"
   8 #include "../core/config.h"
   9 #include "../nick/nick.h"
  10 #include "../core/error.h"
  11 #include "../lib/hmac.h"
  12 #include "../lib/version.h"
  13 #include "../localuser/localuser.h"
  14 #include "../core/hooks.h"
  15 #include "../irc/irc.h"
  16
  17 #define WARN_CHANNEL "#twilightzone"
  18
  19 MODULE_VERSION("");
  20
  21 sstring *sharedsecret = NULL;
  22
  23 int ta_ticketauth(void *source, int cargc, char **cargv) {
  24   nick *np = (nick *)source;
  25   char buffer[1024], *uhmac, *acc, *junk;
  26   unsigned char digest[32];
  27   int expiry, acclen, id;
  28   hmacsha256 hmac;
  29   channel *wcp;
  30
  31   if(IsAccount(np)) {
  32     controlreply(np, "You're already authed.");
  33     return CMD_ERROR;
  34   }
  35
  36   if(cargc != 5)
  37     return CMD_USAGE;
  38
  39   acc = cargv[0];
  40   expiry = atoi(cargv[1]);
  41   id = atoi(cargv[2]);
  42   acclen = strlen(acc);
  43   junk = cargv[3];
  44   uhmac = cargv[4];
  45
  46   if((acclen <= 1) || (acclen > ACCOUNTLEN)) {
  47     controlreply(np, "Bad account.");
  48     return CMD_ERROR;
  49   }
  50
  51   if(time(NULL) > expiry + 30) {
  52     controlwall(NO_OPER, NL_MISC, "%s!%s@%s attempted to TICKETAUTH as %s (expired)", np->nick, np->ident, np->host->name->content, acc);
  53     controlreply(np, "Ticket time is bad or has expired.");
  54     return CMD_ERROR;
  55   }
  56
  57   hmacsha256_init(&hmac, (unsigned char *)sharedsecret->content, sharedsecret->length);
  58   snprintf(buffer, sizeof(buffer), "%s %d %d %s", acc, expiry, id, junk);
  59   hmacsha256_update(&hmac, (unsigned char *)buffer, strlen(buffer));
  60   hmacsha256_final(&hmac, digest);
  61
  62   /* hahahaha */
  63   snprintf(buffer, sizeof(buffer), "%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x", digest[0], digest[1],  digest[2], digest[3], digest[4], digest[5], digest[6], digest[7], digest[8], digest[9], digest[10], digest[11], digest[12], digest[13], digest[14], digest[15], digest[16], digest[17], digest[18], digest[19], digest[20], digest[21], digest[22], digest[23], digest[24], digest[25], digest[26], digest[27], digest[28], digest[29], digest[30], digest[31]);
  64
  65   if(strcasecmp(buffer, uhmac)) {
  66     controlwall(NO_OPER, NL_MISC, "%s!%s@%s attempted to TICKETAUTH as %s (bad HMAC)", np->nick, np->ident, np->host->name->content, acc);
  67     controlreply(np, "Bad HMAC.");
  68     return CMD_ERROR;
  69   }
  70
  71   controlwall(NO_OPER, NL_MISC, "%s!%s@%s TICKETAUTH'ed as %s", np->nick, np->ident, np->host->name->content, acc);
  72
  73   wcp = findchannel(WARN_CHANNEL);
  74   if(wcp)
  75     controlchanmsg(wcp, "WARNING: %s!%s@%s TICKETAUTH'ed as %s", np->nick, np->ident, np->host->name->content, acc);
  76
  77   controlreply(np, "Ticket valid, authing. . .");
  78
  79   localusersetaccountwithuserid(np, acc, id);
  80
  81   controlreply(np, "Done.");
  82   return CMD_OK;
  83 }
  84
  85 void _init() {
  86   sharedsecret = getcopyconfigitem("ticketauth", "sharedsecret", "", 512);
  87   if(!sharedsecret || !sharedsecret->content || !sharedsecret->content[0]) {
  88     Error("ticketauth", ERR_ERROR, "Shared secret not defined in config file.");
  89     if(sharedsecret) {
  90       freesstring(sharedsecret);
  91       sharedsecret = NULL;
  92     }
  93
  94     return;
  95   }
  96
  97   registercontrolhelpcmd("ticketauth", NO_OPERED, 5, ta_ticketauth, "Usage: ticketauth <ticket>");
  98 }
  99
 100 void _fini() {
 101   if(!sharedsecret)
 102     return;
 103
 104   deregistercontrolcmd("ticketauth", ta_ticketauth);
 105
 106   freesstring(sharedsecret);
 107 }