Importing all of DRL, including ulogd and all of its files.

[distributedratelimiting.git] / extensions / ulogd_PWSNIFF.c

diff --git a/extensions/ulogd_PWSNIFF.c b/extensions/ulogd_PWSNIFF.c
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+++ b/extensions/ulogd_PWSNIFF.c
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+/* ulogd_PWSNIFF.c, Version $Revision: 5372 $
+ *
+ * ulogd logging interpreter for POP3 / FTP like plaintext passwords.
+ *
+ * (C) 2000-2003 by Harald Welte <laforge@gnumonks.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 
+ *  as published by the Free Software Foundation
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * $Id: ulogd_PWSNIFF.c 5372 2005-05-04 01:22:56Z laforge $
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/ip.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include "chtons.h"
+#include <ulogd/ulogd.h>
+
+#ifdef DEBUG_PWSNIFF
+#define DEBUGP(x) ulogd_log(ULOGD_DEBUG, x)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+
+#define PORT_POP3      110
+#define PORT_FTP       21
+
+static u_int16_t pwsniff_ports[] = {
+       __constant_htons(PORT_POP3),
+       __constant_htons(PORT_FTP),
+       /* feel free to include any other ports here, provided that their
+        * user/password syntax is the same */
+};
+
+#define PWSNIFF_MAX_PORTS 2
+
+static char *_get_next_blank(char* begp, char *endp)
+{
+       char *ptr;
+
+       for (ptr = begp; ptr < endp; ptr++) {
+               if (*ptr == ' ' || *ptr == '\n' || *ptr == '\r') {
+                       return ptr-1;   
+               }
+       }
+       return NULL;
+}
+
+static ulog_iret_t *_interp_pwsniff(ulog_interpreter_t *ip, ulog_packet_msg_t *pkt)
+{
+       struct iphdr *iph = (struct iphdr *) pkt->payload;
+       void *protoh = (u_int32_t *)iph + iph->ihl;
+       struct tcphdr *tcph = protoh;
+       u_int32_t tcplen = ntohs(iph->tot_len) - iph->ihl * 4;
+       unsigned char  *ptr, *begp, *pw_begp, *endp, *pw_endp;
+       ulog_iret_t *ret = ip->result;
+       int len, pw_len, i, cont = 0;
+
+       len = pw_len = 0;
+       begp = pw_begp = NULL;
+
+       if (iph->protocol != IPPROTO_TCP)
+               return NULL;
+       
+       for (i = 0; i < PWSNIFF_MAX_PORTS; i++)
+       {
+               if (tcph->dest == pwsniff_ports[i]) {
+                       cont = 1; 
+                       break;
+               }
+       }
+       if (!cont)
+               return NULL;
+
+       DEBUGP("----> pwsniff detected, tcplen=%d, struct=%d, iphtotlen=%d, ihl=%d\n", tcplen, sizeof(struct tcphdr), ntohs(iph->tot_len), iph->ihl);
+
+       for (ptr = (unsigned char *) tcph + sizeof(struct tcphdr); 
+                       ptr < (unsigned char *) tcph + tcplen; ptr++)
+       {
+               if (!strncasecmp((char *)ptr, "USER ", 5)) {
+                       begp = ptr+5;
+                       endp = (unsigned char *)_get_next_blank((char *)begp, (char *)tcph + tcplen);
+                       if (endp)
+                               len = endp - begp + 1;
+               }
+               if (!strncasecmp((char *)ptr, "PASS ", 5)) {
+                       pw_begp = ptr+5;
+                       pw_endp = (unsigned char *)_get_next_blank((char *)pw_begp, 
+                                       (char *)tcph + tcplen);
+                       if (pw_endp)
+                               pw_len = pw_endp - pw_begp + 1;
+               }
+       }
+
+       if (len) {
+               ret[0].value.ptr = (char *) malloc(len+1);
+               ret[0].flags |= ULOGD_RETF_VALID;
+               if (!ret[0].value.ptr) {
+                       ulogd_log(ULOGD_ERROR, "OOM (size=%u)\n", len);
+                       return NULL;
+               }
+               strncpy(ret[0].value.ptr, (char *)begp, len);
+               *((char *)ret[0].value.ptr + len + 1) = '\0';
+       }
+       if (pw_len) {
+               ret[1].value.ptr = (char *) malloc(pw_len+1);
+               ret[1].flags |= ULOGD_RETF_VALID;
+               if (!ret[1].value.ptr){
+                       ulogd_log(ULOGD_ERROR, "OOM (size=%u)\n", pw_len);
+                       return NULL;
+               }
+               strncpy(ret[1].value.ptr, (char *)pw_begp, pw_len);
+               *((char *)ret[1].value.ptr + pw_len + 1) = '\0';
+
+       }
+       return ret;
+}
+
+static ulog_iret_t pwsniff_rets[] = {
+       { .type = ULOGD_RET_STRING, 
+         .flags = ULOGD_RETF_FREE, 
+         .key = "pwsniff.user", 
+       }, 
+       { .type = ULOGD_RET_STRING, 
+         .flags = ULOGD_RETF_FREE, 
+         .key = "pwsniff.pass", 
+       },
+};
+
+static ulog_interpreter_t base_ip[] = { 
+       { .name = "pwsniff", 
+         .interp = &_interp_pwsniff, 
+         .key_num = 2, 
+         .result = pwsniff_rets },
+       { NULL, "", 0, NULL, 0, NULL }, 
+};
+
+static void _base_reg_ip(void)
+{
+       ulog_interpreter_t *ip = base_ip;
+       ulog_interpreter_t *p;
+
+       for (p = ip; p->interp; p++)
+               register_interpreter(p);
+}
+
+
+void _init(void)
+{
+       _base_reg_ip();
+}