X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fplugins%2Fradius%2Fradius.c;h=27243b15b7c155f55973c5968d44a237004e105d;hp=358fc95a654c733dcd704b9bb7857a1073fdbb41;hb=2d0e1b1b8bc0587fb9e777b0c9f0019e60cc7194;hpb=8ed456439d306257173fb0c74d77c4e3c472dfc6 diff --git a/pppd/plugins/radius/radius.c b/pppd/plugins/radius/radius.c index 358fc95..27243b1 100644 --- a/pppd/plugins/radius/radius.c +++ b/pppd/plugins/radius/radius.c @@ -2,8 +2,8 @@ * * radius.c * -* RADIUS plugin for pppd. Performs PAP, CHAP and MS-CHAP authentication -* using RADIUS. +* RADIUS plugin for pppd. Performs PAP, CHAP, MS-CHAP, MS-CHAPv2 +* authentication using RADIUS. * * Copyright (C) 2002 Roaring Penguin Software Inc. * @@ -16,17 +16,23 @@ * Copyright (C) 1995,1996,1997,1998 Lars Fenneberg * Copyright (C) 2002 Roaring Penguin Software Inc. * +* MPPE support is by Ralf Hofmann, , with +* modification from Frank Cusack, . +* * This plugin may be distributed according to the terms of the GNU * General Public License, version 2 or (at your option) any later version. * ***********************************************************************/ static char const RCSID[] = -"$Id: radius.c,v 1.5 2002/03/04 14:59:51 dfs Exp $"; +"$Id: radius.c,v 1.15 2002/09/12 05:41:49 fcusack Exp $"; #include "pppd.h" #include "chap.h" #ifdef CHAPMS #include "chap_ms.h" +#ifdef MPPE +#include "md5.h" +#endif #endif #include "radiusclient.h" #include "fsm.h" @@ -34,6 +40,7 @@ static char const RCSID[] = #include #include #include +#include #define BUF_LEN 1024 @@ -58,16 +65,27 @@ static int radius_chap_auth(char *user, static void radius_ip_up(void *opaque, int arg); static void radius_ip_down(void *opaque, int arg); static void make_username_realm(char *user); -static int radius_setparams(VALUE_PAIR *vp, char *msg); +static int radius_setparams(chap_state *cstate, VALUE_PAIR *vp, char *msg, + REQUEST_INFO *req_info); static void radius_choose_ip(u_int32_t *addrp); static int radius_init(char *msg); static int get_client_port(char *ifname); static int radius_allowed_address(u_int32_t addr); +static void radius_acct_interim(void *); +#ifdef MPPE +static int radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info, + chap_state *); +static int radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info); +#endif #ifndef MAXSESSIONID #define MAXSESSIONID 32 #endif +#ifndef MAXCLASSLEN +#define MAXCLASSLEN 500 +#endif + struct radius_state { int accounting_started; int initialized; @@ -80,8 +98,11 @@ struct radius_state { char config_file[MAXPATHLEN]; char session_id[MAXSESSIONID + 1]; time_t start_time; + int acct_interim_interval; SERVER *authserver; /* Authentication server to use */ SERVER *acctserver; /* Accounting server to use */ + int class_len; + char class[MAXCLASSLEN]; }; void (*radius_attributes_hook)(VALUE_PAIR *) = NULL; @@ -227,13 +248,13 @@ radius_pap_auth(char *user, if (rstate.authserver) { result = rc_auth_using_server(rstate.authserver, rstate.client_port, send, - &received, radius_msg); + &received, radius_msg, NULL); } else { - result = rc_auth(rstate.client_port, send, &received, radius_msg); + result = rc_auth(rstate.client_port, send, &received, radius_msg, NULL); } if (result == OK_RC) { - if (radius_setparams(received, radius_msg) < 0) { + if (radius_setparams(NULL, received, radius_msg, NULL) < 0) { result = ERROR_RC; } } @@ -255,7 +276,7 @@ radius_pap_auth(char *user, * %RETURNS: * CHAP_SUCCESS if we can authenticate, CHAP_FAILURE if we cannot. * %DESCRIPTION: -* Performs CHAP and MS-CHAP authentication using RADIUS +* Performs CHAP, MS-CHAP and MS-CHAPv2 authentication using RADIUS. ***********************************************************************/ static int radius_chap_auth(char *user, @@ -268,6 +289,13 @@ radius_chap_auth(char *user, static char radius_msg[BUF_LEN]; int result; u_char cpassword[MAX_RESPONSE_LENGTH + 1]; +#ifdef MPPE + /* Need the RADIUS secret and Request Authenticator to decode MPPE */ + REQUEST_INFO request_info, *req_info = &request_info; +#else + REQUEST_INFO *req_info = NULL; +#endif + radius_msg[0] = 0; if (radius_init(radius_msg) < 0) { @@ -279,6 +307,7 @@ radius_chap_auth(char *user, if ((cstate->chal_type != CHAP_DIGEST_MD5) #ifdef CHAPMS && (cstate->chal_type != CHAP_MICROSOFT) + && (cstate->chal_type != CHAP_MICROSOFT_V2) #endif ) { error("RADIUS: Challenge type %u unsupported", cstate->chal_type); @@ -325,7 +354,7 @@ radius_chap_auth(char *user, case CHAP_MICROSOFT: { /* MS-CHAP-Challenge and MS-CHAP-Response */ - MS_ChapResponse *rmd = remmd; + MS_ChapResponse *rmd = (MS_ChapResponse *) remmd; u_char *p = cpassword; *p++ = cstate->chal_id; @@ -342,6 +371,29 @@ radius_chap_auth(char *user, cpassword, MS_CHAP_RESPONSE_LEN + 1, VENDOR_MICROSOFT); break; } + + case CHAP_MICROSOFT_V2: + { + /* MS-CHAP-Challenge and MS-CHAP2-Response */ + MS_Chap2Response *rmd = (MS_Chap2Response *) remmd; + u_char *p = cpassword; + + *p++ = cstate->chal_id; + /* The idiots use a different field order in RADIUS than PPP */ + memcpy(p, rmd->Flags, sizeof(rmd->Flags)); + p += sizeof(rmd->Flags); + memcpy(p, rmd->PeerChallenge, sizeof(rmd->PeerChallenge)); + p += sizeof(rmd->PeerChallenge); + memcpy(p, rmd->Reserved, sizeof(rmd->Reserved)); + p += sizeof(rmd->Reserved); + memcpy(p, rmd->NTResp, sizeof(rmd->NTResp)); + + rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE, + cstate->challenge, cstate->chal_len, VENDOR_MICROSOFT); + rc_avpair_add(&send, PW_MS_CHAP2_RESPONSE, + cpassword, MS_CHAP2_RESPONSE_LEN + 1, VENDOR_MICROSOFT); + break; + } #endif } @@ -353,14 +405,15 @@ radius_chap_auth(char *user, if (rstate.authserver) { result = rc_auth_using_server(rstate.authserver, rstate.client_port, send, - &received, radius_msg); + &received, radius_msg, req_info); } else { - result = rc_auth(rstate.client_port, send, &received, radius_msg); + result = rc_auth(rstate.client_port, send, &received, radius_msg, + req_info); } if (result == OK_RC) { if (!rstate.done_chap_once) { - if (radius_setparams(received, radius_msg) < 0) { + if (radius_setparams(cstate, received, radius_msg, req_info) < 0) { error("%s", radius_msg); result = ERROR_RC; } else { @@ -408,18 +461,20 @@ make_username_realm(char *user) /********************************************************************** * %FUNCTION: radius_setparams * %ARGUMENTS: +* cstate -- pppd's chap_state structure * vp -- received value-pairs * msg -- buffer in which to place error message. Holds up to BUF_LEN chars * %RETURNS: * >= 0 on success; -1 on failure * %DESCRIPTION: -* Parses attributes sent by RADIUS server and sets them in pppd. Currently, -* used only to set IP address. +* Parses attributes sent by RADIUS server and sets them in pppd. ***********************************************************************/ static int -radius_setparams(VALUE_PAIR *vp, char *msg) +radius_setparams(chap_state *cstate, VALUE_PAIR *vp, char *msg, + REQUEST_INFO *req_info) { u_int32_t remote; + int ms_chap2_success = 0; /* Send RADIUS attributes to anyone else who might be interested */ if (radius_attributes_hook) { @@ -443,6 +498,7 @@ radius_setparams(VALUE_PAIR *vp, char *msg) return -1; } break; + case PW_FRAMED_PROTOCOL: /* check for framed protocol type */ /* if not PPP then also exit */ @@ -453,6 +509,30 @@ radius_setparams(VALUE_PAIR *vp, char *msg) } break; + case PW_SESSION_TIMEOUT: + /* Session timeout */ + maxconnect = vp->lvalue; + break; +#ifdef MAXOCTETS + case PW_SESSION_OCTETS_LIMIT: + /* Session traffic limit */ + maxoctets = vp->lvalue; + break; + case PW_OCTETS_DIRECTION: + /* Session traffic limit direction check */ + maxoctets_dir = ( vp->lvalue > 4 ) ? 0 : vp->lvalue ; + break; +#endif + case PW_ACCT_INTERIM_INTERVAL: + /* Send accounting updates every few seconds */ + rstate.acct_interim_interval = vp->lvalue; + /* RFC says it MUST NOT be less than 60 seconds */ + /* We use "0" to signify not sending updates */ + if (rstate.acct_interim_interval && + rstate.acct_interim_interval < 60) { + rstate.acct_interim_interval = 60; + } + break; case PW_FRAMED_IP_ADDRESS: /* seting up remote IP addresses */ remote = vp->lvalue; @@ -470,13 +550,196 @@ radius_setparams(VALUE_PAIR *vp, char *msg) rstate.choose_ip = 1; rstate.ip_addr = remote; } - break; + break; + case PW_CLASS: + /* Save Class attribute to pass it in accounting request */ + if (vp->lvalue <= MAXCLASSLEN) { + rstate.class_len=vp->lvalue; + memcpy(rstate.class, vp->strvalue, rstate.class_len); + } /* else too big for our buffer - ignore it */ + break; + } + + +#ifdef CHAPMS + } else if (vp->vendorcode == VENDOR_MICROSOFT) { + switch (vp->attribute) { + case PW_MS_CHAP2_SUCCESS: + if ((vp->lvalue != 43) || strncmp(vp->strvalue + 1, "S=", 2)) { + slprintf(msg,BUF_LEN,"RADIUS: bad MS-CHAP2-Success packet"); + return -1; + } + memcpy(cstate->saresponse, vp->strvalue + 3, + MS_AUTH_RESPONSE_LENGTH); + cstate->saresponse[MS_AUTH_RESPONSE_LENGTH] = '\0'; + ms_chap2_success = 1; + break; + +#ifdef MPPE + case PW_MS_CHAP_MPPE_KEYS: + if (radius_setmppekeys(vp, req_info, cstate) < 0) { + slprintf(msg, BUF_LEN, + "RADIUS: bad MS-CHAP-MPPE-Keys attribute"); + return -1; + } + break; + + case PW_MS_MPPE_SEND_KEY: + case PW_MS_MPPE_RECV_KEY: + if (radius_setmppekeys2(vp, req_info) < 0) { + slprintf(msg, BUF_LEN, + "RADIUS: bad MS-MPPE-%s-Key attribute", + (vp->attribute == PW_MS_MPPE_SEND_KEY)? + "Send": "Recv"); + return -1; + } + break; +#endif /* MPPE */ +#if 0 + case PW_MS_MPPE_ENCRYPTION_POLICY: + case PW_MS_MPPE_ENCRYPTION_TYPES: + case PW_MS_PRIMARY_DNS_SERVER: + case PW_MS_SECONDARY_DNS_SERVER: + case PW_MS_PRIMARY_NBNS_SERVER: + case PW_MS_SECONDARY_NBNS_SERVER: + break; +#endif } +#endif /* CHAPMS */ } vp = vp->next; } + + /* Require a valid MS-CHAP2-SUCCESS for MS-CHAPv2 auth */ + if (cstate && (cstate->chal_type == CHAP_MICROSOFT_V2) && !ms_chap2_success) + return -1; + + return 0; +} + +#ifdef MPPE +/********************************************************************** +* %FUNCTION: radius_setmppekeys +* %ARGUMENTS: +* vp -- value pair holding MS-CHAP-MPPE-KEYS attribute +* req_info -- radius request information used for encryption +* cstate -- chap_state structure for challenge info +* %RETURNS: +* >= 0 on success; -1 on failure +* %DESCRIPTION: +* Decrypt the "key" provided by the RADIUS server for MPPE encryption. +* See RFC 2548. +***********************************************************************/ +static int +radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info, chap_state *cstate) +{ + int i; + MD5_CTX Context; + u_char plain[32]; + u_char buf[16]; + + if (vp->lvalue != 32) { + error("RADIUS: Incorrect attribute length (%d) for MS-CHAP-MPPE-Keys", + vp->lvalue); + return -1; + } + + memcpy(plain, vp->strvalue, sizeof(plain)); + + MD5Init(&Context); + MD5Update(&Context, req_info->secret, strlen(req_info->secret)); + MD5Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN); + MD5Final(buf, &Context); + + for (i = 0; i < 16; i++) + plain[i] ^= buf[i]; + + MD5Init(&Context); + MD5Update(&Context, req_info->secret, strlen(req_info->secret)); + MD5Update(&Context, vp->strvalue, 16); + MD5Final(buf, &Context); + + for(i = 0; i < 16; i++) + plain[i + 16] ^= buf[i]; + + /* + * Annoying. The "key" returned is just the NTPasswordHashHash, which + * the NAS (us) doesn't need; we only need the start key. So we have + * to generate the start key, sigh. NB: We do not support the LM-Key. + */ + mppe_set_keys(cstate->challenge, &plain[8]); + + return 0; +} + +/********************************************************************** +* %FUNCTION: radius_setmppekeys2 +* %ARGUMENTS: +* vp -- value pair holding MS-MPPE-SEND-KEY or MS-MPPE-RECV-KEY attribute +* req_info -- radius request information used for encryption +* %RETURNS: +* >= 0 on success; -1 on failure +* %DESCRIPTION: +* Decrypt the key provided by the RADIUS server for MPPE encryption. +* See RFC 2548. +***********************************************************************/ +static int +radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info) +{ + int i; + MD5_CTX Context; + u_char *salt = vp->strvalue; + u_char *crypt = vp->strvalue + 2; + u_char plain[32]; + u_char buf[MD5_SIGNATURE_SIZE]; + char *type = "Send"; + + if (vp->attribute == PW_MS_MPPE_RECV_KEY) + type = "Recv"; + + if (vp->lvalue != 34) { + error("RADIUS: Incorrect attribute length (%d) for MS-MPPE-%s-Key", + vp->lvalue, type); + return -1; + } + + if ((salt[0] & 0x80) == 0) { + error("RADIUS: Illegal salt value for MS-MPPE-%s-Key attribute", type); + return -1; + } + + memcpy(plain, crypt, 32); + + MD5Init(&Context); + MD5Update(&Context, req_info->secret, strlen(req_info->secret)); + MD5Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN); + MD5Update(&Context, salt, 2); + MD5Final(buf, &Context); + + for (i = 0; i < 16; i++) + plain[i] ^= buf[i]; + + if (plain[0] != sizeof(mppe_send_key) /* 16 */) { + error("RADIUS: Incorrect key length (%d) for MS-MPPE-%s-Key attribute", + (int) plain[0], type); + return -1; + } + + MD5Init(&Context); + MD5Update(&Context, req_info->secret, strlen(req_info->secret)); + MD5Update(&Context, crypt, 16); + MD5Final(buf, &Context); + + plain[16] ^= buf[0]; /* only need the first byte */ + + if (vp->attribute == PW_MS_MPPE_SEND_KEY) + memcpy(mppe_send_key, plain + 1, 16); + else + memcpy(mppe_recv_key, plain + 1, 16); + return 0; } +#endif /* MPPE */ /********************************************************************** * %FUNCTION: radius_acct_start @@ -509,6 +772,10 @@ radius_acct_start(void) rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE); + if (rstate.class_len > 0) + rc_avpair_add(&send, PW_CLASS, + rstate.class, rstate.class_len, VENDOR_NONE); + av_type = PW_STATUS_START; rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE); @@ -549,6 +816,10 @@ radius_acct_start(void) "Accounting START failed for %s", rstate.user); } else { rstate.accounting_started = 1; + /* Kick off periodic accounting reports */ + if (rstate.acct_interim_interval) { + TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval); + } } } @@ -641,6 +912,101 @@ radius_acct_stop(void) rc_avpair_free(send); } +/********************************************************************** +* %FUNCTION: radius_acct_interim +* %ARGUMENTS: +* None +* %RETURNS: +* Nothing +* %DESCRIPTION: +* Sends an interim accounting message to the RADIUS server +***********************************************************************/ +static void +radius_acct_interim(void *ignored) +{ + UINT4 av_type; + VALUE_PAIR *send = NULL; + ipcp_options *ho = &ipcp_hisoptions[0]; + u_int32_t hisaddr; + int result; + + if (!rstate.initialized) { + return; + } + + if (!rstate.accounting_started) { + return; + } + + rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id, + 0, VENDOR_NONE); + + rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE); + + av_type = PW_STATUS_ALIVE; + rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE); + + av_type = PW_FRAMED; + rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE); + + av_type = PW_PPP; + rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE); + + av_type = PW_RADIUS; + rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE); + + /* Update link stats */ + update_link_stats(0); + + if (link_stats_valid) { + link_stats_valid = 0; /* Force later code to update */ + + av_type = link_connect_time; + rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE); + + av_type = link_stats.bytes_out; + rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE); + + av_type = link_stats.bytes_in; + rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE); + + av_type = link_stats.pkts_out; + rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE); + + av_type = link_stats.pkts_in; + rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE); + } + + if (*remote_number) { + rc_avpair_add(&send, PW_CALLING_STATION_ID, + remote_number, 0, VENDOR_NONE); + } + + av_type = PW_ASYNC; + rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE); + + hisaddr = ho->hisaddr; + av_type = htonl(hisaddr); + rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE); + + if (rstate.acctserver) { + result = rc_acct_using_server(rstate.acctserver, + rstate.client_port, send); + } else { + result = rc_acct(rstate.client_port, send); + } + + if (result != OK_RC) { + /* RADIUS server could be down so make this a warning */ + syslog(LOG_WARNING, + "Interim accounting failed for %s", rstate.user); + } + rc_avpair_free(send); + + /* Schedule another one */ + TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval); +} + /********************************************************************** * %FUNCTION: radius_ip_up * %ARGUMENTS: