/*********************************************************************** RADIUS Remote Authentication Dial In User Service Lucent Technologies Remote Access 4464 Willow Road Pleasanton, CA 94588 Copyright 1992-1999 Lucent Technologies Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * All advertising materials mentioning features or use of this software must display the following acknowledgement: This product includes software developed by Lucent Technologies and its contributors. * Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. This software is provided by the copyright holders and contributors ``as is'' and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the copyright holder or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage. ************************************************************************/ static char sccsid[] = "$Id: acct.c,v 1.16 1999/06/23 23:40:37 cdr Exp $ Copyright 1994-1999 Lucent Technologies, Inc."; #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "radius.h" #define SIGN_NOCLIENT -1 #define SIGN_MATCH 0 #define SIGN_ZERO 1 /* only returned if accept_zero is set */ #define SIGN_NOMATCH 2 extern char recv_buffer[4096]; extern char send_buffer[4096]; extern char *progname; extern int debug_flag; extern int accept_zero; #ifdef VPORTS extern int vports_flag; #endif extern char *radacct_dir; extern char *radius_dir; extern UINT4 expiration_seconds; extern UINT4 warning_seconds; extern int errno; extern struct sockaddr_in rad_saremote; void rad_acctreq(fd) int fd; { AUTH_REQ *authreq; AUTH_REQ *radrecv(); UINT4 addr; char *ip_hostname(); char *ipaddr2strp(); char secret[20]; int calc_acctreq(); int handle_proxy(); int logok; int proxied; int rad_accounting(); int recfrom(); int retsig; int result; size_t salen; struct sockaddr_in *sin; u_short port; time_t time(); void hexdump(); void reqfree(); void send_acct_reply(); void vp_update_cid(); salen = sizeof(rad_saremote); sin = (struct sockaddr_in *) & rad_saremote; result = recvfrom (fd, (char *) recv_buffer, (int) sizeof(recv_buffer), (int) 0, (struct sockaddr *)&rad_saremote, &salen); if (result < AUTH_HDR_LEN) { log_err("accounting: runt packet of %d bytes\n",result); return; } addr = ntohl(sin->sin_addr.s_addr); port = ntohs(sin->sin_port); /* Verify the client -- returns shared secret in secret */ retsig=calc_acctreq(addr,secret,recv_buffer,result); /* To be strictly compliant with the RADIUS Accounting RFC we only accept packets that returned SIGN_MATCH to indicate the Request-Authenticator is valid. This requires ComOS 3.3.1 or later. If accept_flag is set then we also accept all-zero Request-Authenticator. */ if (retsig == SIGN_NOCLIENT) { /* We do not respond when this fails */ log_err("accounting: unknown client %s/%d ignored\n", ipaddr2strp(addr),port); return; } else if (retsig == SIGN_NOMATCH) { log_err("accounting: client %s/%d sent accounting-request with invalid request authenticator\n",ipaddr2strp(addr),port); if (debug_flag > 2) { hexdump(recv_buffer, result); } return; } authreq = radrecv( addr, port, secret, recv_buffer, result ); if (authreq == (AUTH_REQ *)NULL) { return; } /* log it locally */ logok = rad_accounting(authreq,retsig); /* handle_proxy returns 1 if it forwarded the packet, 0 if it did not forward the packet, and -1 if there was an error */ proxied = handle_proxy(authreq); if (authreq->flags & REQ_ERR) { reqfree(authreq,"rad_acctreq"); return; } /* If we did not forward this to a remote server, we now let NAS know it is OK to delete from buffer If we did forward it to a proxy server, we will notify NAS to delete when we get the ack back from the remote server. This means it may wind up in our own logs multiple times, but that is useful to know */ if (proxied == 0) { if (logok == 1) { send_acct_reply(authreq, (VALUE_PAIR *)NULL, fd); } reqfree(authreq,"rad_acctreq"); } if (proxied == 1 && (authreq->flags & REQ_FREE)) { reqfree(authreq,"rad_acctreq"); } return; } int rad_accounting(authreq,sign) AUTH_REQ *authreq; int sign; { FILE *outfd; char buffer[512]; char *client_hostname(); char clientname[MAX_HOST_SIZE]; char *ctime(); VALUE_PAIR *pair; time_t curtime; time_t time(); int fclose(); int fputs(); void fprint_attr_val(); #ifdef VPORTS void vp_update_cid(); #endif if (authreq == (AUTH_REQ *)NULL) { return 0; } #ifdef VPORTS if (vports_flag == 1) { vp_update_cid(authreq); } #endif /* VPORTS */ strncpy(clientname, client_hostname(authreq->ipaddr), MAX_HOST_SIZE); /* * Create a directory for this client. */ sprintf(buffer, "%s/%s", radacct_dir, clientname); mkdir(buffer, (mode_t) 0755); /* * Write Detail file. */ sprintf(buffer, "%s/%s/detail", radacct_dir, clientname); if((outfd = fopen(buffer, "a")) == (FILE *)NULL) { log_err("accounting: could not append to file %s\n", buffer); /* do not respond if we cannot save record */ return 0; } /* Post a timestamp */ curtime = time(0); fputs(ctime(&curtime), outfd); /* Write each attribute/value to the log file */ pair = authreq->request; while(pair != (VALUE_PAIR *)NULL) { if (pair->attribute != PW_PROXY) { fputs("\t", outfd); fprint_attr_val(outfd, pair); fputs("\n", outfd); } pair = pair->next; } /* print the seconds since epoch for easier processing */ sprintf(buffer,"\tTimestamp = %ld\n",(long)curtime); fputs(buffer,outfd); if (sign == SIGN_ZERO) { fputs("\tRequest-Authenticator = None\n",outfd); } fputs("\n", outfd); fclose(outfd); return 1; } /************************************************************************* * * Function: send_acct_reply * * Purpose: Reply to the request with an ACKNOWLEDGE. Also attach * reply attribute value pairs (not that there should be any) * *************************************************************************/ void send_acct_reply(authreq, reply, activefd) AUTH_REQ *authreq; VALUE_PAIR *reply; int activefd; { extern int report[]; char *req2strp(); int total_length; int build_packet(); void send_packet(); DEBUG("sending acct-response to %s\n", req2strp(authreq)); total_length = build_packet(authreq,reply,(char *)NULL,PW_ACCOUNTING_RESPONSE,FW_REPLY,send_buffer); send_packet(activefd,authreq->ipaddr,authreq->udp_port, send_buffer,total_length); report[RR_ACCOUNT]++; } /************************************************************************* * * Function: calc_acctreq * * Purpose: Validates the requesting client NAS. Calculates * the accounting-request signature based on the * client's private key. * Returns: -1 Client not found * 0 signature matched expected value * 1 signature was all-zero and accept_zero flag is true * 2 signature was non-zero and did not match * *************************************************************************/ int calc_acctreq(client,secret,buffer,buflen) UINT4 client; char *secret; u_char *buffer; int buflen; { extern int accept_zero; AUTH_HDR *auth; u_char digest[AUTH_VECTOR_LEN]; u_char savedigest[AUTH_VECTOR_LEN]; char hostnm[256]; int secretlen; int len; int find_client(); void md5_calc(); /* * Validate the requesting IP address - * Not secure, but worth the check for accidental requests * find_client() logs an error message if needed */ if(find_client(client, secret, hostnm) != 0) { return(SIGN_NOCLIENT); } /* * The NAS and RADIUS accounting server share a secret. * The Request Authenticator field in Accounting-Request packets * contains a one-way MD5 hash calculated over a stream of octets * consisting of the Code + Identifier + Length + 16 zero octets + * request attributes + shared secret (where + indicates * concatenation). The 16 octet MD5 hash value is stored in the * Authenticator field of the Accounting-Request packet. */ auth = (AUTH_HDR *)buffer; memset(savedigest, 0, AUTH_VECTOR_LEN); if (accept_zero && memcmp(savedigest,auth->vector,AUTH_VECTOR_LEN) == 0) { return(SIGN_ZERO); } len = ntohs(auth->length); memcpy(savedigest,auth->vector,AUTH_VECTOR_LEN); memset(auth->vector, 0, AUTH_VECTOR_LEN); secretlen = strlen((char *)secret); memcpy(buffer+len,secret,secretlen); md5_calc(digest, buffer, len+secretlen); memcpy(auth->vector,savedigest,AUTH_VECTOR_LEN); memset(buffer+len,0,secretlen); if (memcmp(digest,savedigest,AUTH_VECTOR_LEN) == 0) { return(SIGN_MATCH); } else { return(SIGN_NOMATCH); } /* secret is returned as a side-effect */ }