X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/99921507eb9b842d4f41c5516af1f455d4a49a99..1e722029bc405a555e81840c00708084128c5cdd:/radius.c?ds=inline diff --git a/radius.c b/radius.c index 02b29b7..8481561 100644 --- a/radius.c +++ b/radius.c @@ -11,6 +11,7 @@ #include #include #include + #include "md5.h" #include "constants.h" #include "l2tpns.h" @@ -18,6 +19,9 @@ #include "util.h" #include "cluster.h" +#include "l2tplac.h" +#include "pppoe.h" + extern radiust *radius; extern sessiont *session; extern tunnelt *tunnel; @@ -230,6 +234,7 @@ void radiussend(uint16_t r, uint8_t state) } b[1] = r >> RADIUS_SHIFT; // identifier memcpy(b + 4, radius[r].auth, 16); + p = b + 20; if (s) { @@ -530,6 +535,7 @@ void processrad(uint8_t *buf, int len, char socket_index) uint8_t routes = 0; int r_code; int r_id; + int OpentunnelReq = 0; CSTAT(processrad); @@ -591,6 +597,7 @@ void processrad(uint8_t *buf, int len, char socket_index) run_plugins(PLUGIN_POST_AUTH, &packet); r_code = packet.auth_allowed ? AccessAccept : AccessReject; +#ifndef LAC // process auth response if (radius[r].chap) { @@ -622,6 +629,7 @@ void processrad(uint8_t *buf, int len, char socket_index) LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user, (r_code == AccessAccept) ? "allowed" : "denied"); } +#endif if (r_code == AccessAccept) { @@ -629,6 +637,10 @@ void processrad(uint8_t *buf, int len, char socket_index) // Extract IP, routes, etc uint8_t *p = buf + 20; uint8_t *e = buf + len; + uint8_t tag; + uint8_t strtemp[256]; + lac_reset_rad_tag_tunnel_ctxt(); + for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1]) { if (*p == 26 && p[1] >= 7) @@ -823,6 +835,94 @@ void processrad(uint8_t *buf, int len, char socket_index) session[s].classlen = MAXCLASS; memcpy(session[s].class, p + 2, session[s].classlen); } + else if (*p == 64) + { + // Tunnel-Type + if (p[1] != 6) continue; + tag = p[2]; + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Type:%d %d\n", + tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF); + // Fill context + lac_set_rad_tag_tunnel_type(tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF); + /* Request open tunnel to remote LNS*/ + OpentunnelReq = 1; + } + else if (*p == 65) + { + // Tunnel-Medium-Type + if (p[1] < 6) continue; + tag = p[2]; + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Medium-Type:%d %d\n", + tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF); + // Fill context + lac_set_rad_tag_tunnel_medium_type(tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF); + } + else if (*p == 67) + { + // Tunnel-Server-Endpoint + if (p[1] < 3) continue; + tag = p[2]; + //If the Tag field is greater than 0x1F, + // it SHOULD be interpreted as the first byte of the following String field. + memset(strtemp, 0, 256); + if (tag > 0x1F) + { + tag = 0; + memcpy(strtemp, (p + 2), p[1]-2); + } + else + memcpy(strtemp, (p + 3), p[1]-3); + + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Server-Endpoint:%d %s\n", tag, strtemp); + // Fill context + lac_set_rad_tag_tunnel_serv_endpt(tag, (char *) strtemp); + } + else if (*p == 69) + { + // Tunnel-Password + size_t lentemp; + + if (p[1] < 5) continue; + tag = p[2]; + + memset(strtemp, 0, 256); + lentemp = p[1]-3; + memcpy(strtemp, (p + 3), lentemp); + if (!rad_tunnel_pwdecode(strtemp, &lentemp, config->radiussecret, radius[r].auth)) + { + LOG_HEX(3, "Error Decode Tunnel-Password, Dump Radius reponse:", p, p[1]); + continue; + } + + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Password:%d %s\n", tag, strtemp); + if (strlen((char *) strtemp) > 63) + { + LOG(1, s, session[s].tunnel, "tunnel password is too long (>63)\n"); + continue; + } + // Fill context + lac_set_rad_tag_tunnel_password(tag, (char *) strtemp); + } + else if (*p == 82) + { + // Tunnel-Assignment-Id + if (p[1] < 3) continue; + tag = p[2]; + //If the Tag field is greater than 0x1F, + // it SHOULD be interpreted as the first byte of the following String field. + memset(strtemp, 0, 256); + if (tag > 0x1F) + { + tag = 0; + memcpy(strtemp, (p + 2), p[1]-2); + } + else + memcpy(strtemp, (p + 3), p[1]-3); + + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Assignment-Id:%d %s\n", tag, strtemp); + // Fill context + lac_set_rad_tag_tunnel_assignment_id(tag, (char *) strtemp); + } } } else if (r_code == AccessReject) @@ -832,6 +932,63 @@ void processrad(uint8_t *buf, int len, char socket_index) break; } + if ((!config->disable_lac_func) && OpentunnelReq) + { + char assignment_id[256]; + // Save radius tag context to conf + lac_save_rad_tag_tunnels(s); + + memset(assignment_id, 0, 256); + if (!lac_rad_select_assignment_id(s, assignment_id)) + break; // Error no assignment_id + + LOG(3, s, session[s].tunnel, "Select Tunnel Remote LNS for assignment_id == %s\n", assignment_id); + + if (lac_rad_forwardtoremotelns(s, assignment_id, session[s].user)) + { + int ro; + // Sanity check, no local IP to session forwarded + session[s].ip = 0; + for (ro = 0; r < MAXROUTE && session[s].route[ro].ip; r++) + { + session[s].route[ro].ip = 0; + } + break; + } + } + + // process auth response + if (radius[r].chap) + { + // CHAP + uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0); + if (!p) return; // Abort! + + *p = (r_code == AccessAccept) ? 3 : 4; // ack/nak + p[1] = radius[r].id; + *(uint16_t *) (p + 2) = ntohs(4); // no message + tunnelsend(b, (p - b) + 4, t); // send it + + LOG(3, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user, + (r_code == AccessAccept) ? "allowed" : "denied"); + } + else + { + // PAP + uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0); + if (!p) return; // Abort! + + // ack/nak + *p = r_code; + p[1] = radius[r].id; + *(uint16_t *) (p + 2) = ntohs(5); + p[4] = 0; // no message + tunnelsend(b, (p - b) + 5, t); // send it + + LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user, + (r_code == AccessAccept) ? "allowed" : "denied"); + } + if (!session[s].dns1 && config->default_dns1) { session[s].dns1 = ntohl(config->default_dns1); @@ -1174,3 +1331,94 @@ void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struc if (sendtofrom(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen, local) < 0) LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno)); } + +// Decrypte the encrypted Tunnel Password. +// Defined in RFC-2868. +// the pl2tpsecret buffer must set to 256 characters. +// return 0 on decoding error else length of decoded l2tpsecret +int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen, + const char *radiussecret, const uint8_t * auth) +{ + MD5_CTX ctx, oldctx; + hasht hash; + int secretlen; + unsigned i, n, len, decodedlen; + +/* 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 6 7 +* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Salt | Salt | String .......... + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*/ + + len = *pl2tpsecretlen; + + if (len < 2) + { + LOG(1, 0, 0, "tunnel password is too short, We need at least a salt\n"); + return 0; + } + + if (len <= 3) + { + pl2tpsecret[0] = 0; + *pl2tpsecretlen = 0; + LOG(1, 0, 0, "tunnel passwd is empty !!!\n"); + return 0; + } + + len -= 2; /* discount the salt */ + + //Use the secret to setup the decryption + secretlen = strlen(radiussecret); + + MD5_Init(&ctx); + MD5_Update(&ctx, (void *) radiussecret, secretlen); + oldctx = ctx; /* save intermediate work */ + + // Set up the initial key: + // b(1) = MD5(radiussecret + auth + salt) + MD5_Update(&ctx, (void *) auth, 16); + MD5_Update(&ctx, pl2tpsecret, 2); + + decodedlen = 0; + for (n = 0; n < len; n += 16) + { + int base = 0; + + if (n == 0) + { + MD5_Final(hash, &ctx); + + ctx = oldctx; + + // the first octet, it's the 'data_len' + // Check is correct + decodedlen = pl2tpsecret[2] ^ hash[0]; + if (decodedlen >= len) + { + LOG(1, 0, 0, "tunnel password is too long !!!\n"); + return 0; + } + + MD5_Update(&ctx, pl2tpsecret + 2, 16); + base = 1; + } else + { + MD5_Final(hash, &ctx); + + ctx = oldctx; + MD5_Update(&ctx, pl2tpsecret + n + 2, 16); + } + + for (i = base; i < 16; i++) + { + pl2tpsecret[n + i - 1] = pl2tpsecret[n + i + 2] ^ hash[i]; + } + } + + if (decodedlen > 239) decodedlen = 239; + + *pl2tpsecretlen = decodedlen; + pl2tpsecret[decodedlen] = 0; + + return decodedlen; +};