/* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 * * @(#)keyserv.c 1.15 94/04/25 SMI * $FreeBSD: src/usr.sbin/keyserv/keyserv.c,v 1.3.2.2 2001/07/19 10:58:22 roam Exp $ * $DragonFly: src/usr.sbin/keyserv/keyserv.c,v 1.6 2004/12/18 22:48:03 swildner Exp $ */ /* * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc. */ /* * Keyserver * Store secret keys per uid. Do public key encryption and decryption * operations. Generate "random" keys. * Do not talk to anything but a local root * process on the local transport only */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "keyserv.h" #ifndef NGROUPS #define NGROUPS 16 #endif #ifndef KEYSERVSOCK #define KEYSERVSOCK "/var/run/keyservsock" #endif static void randomize( des_block * ); static void usage( void ); static int getrootkey( des_block *, int ); static int root_auth( SVCXPRT *, struct svc_req * ); #ifdef DEBUG static int debugging = 1; #else static int debugging = 0; #endif static void keyprogram(); static des_block masterkey; char *getenv(); static char ROOTKEY[] = "/etc/.rootkey"; /* * Hack to allow the keyserver to use AUTH_DES (for authenticated * NIS+ calls, for example). The only functions that get called * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. * * The approach is to have the keyserver fill in pointers to local * implementations of these functions, and to call those in key_call(). */ extern cryptkeyres *(*__key_encryptsession_pk_LOCAL)(); extern cryptkeyres *(*__key_decryptsession_pk_LOCAL)(); extern des_block *(*__key_gendes_LOCAL)(); extern int (*__des_crypt_LOCAL)(); cryptkeyres *key_encrypt_pk_2_svc_prog( uid_t, cryptkeyarg2 * ); cryptkeyres *key_decrypt_pk_2_svc_prog( uid_t, cryptkeyarg2 * ); des_block *key_gen_1_svc_prog( void *, struct svc_req * ); int main(int argc, char **argv) { int nflag = 0; int c; SVCXPRT *transp; int sock = RPC_ANYSOCK; int warn = 0; char *path = NULL; __key_encryptsession_pk_LOCAL = &key_encrypt_pk_2_svc_prog; __key_decryptsession_pk_LOCAL = &key_decrypt_pk_2_svc_prog; __key_gendes_LOCAL = &key_gen_1_svc_prog; while ((c = getopt(argc, argv, "ndDvp:")) != -1) switch (c) { case 'n': nflag++; break; case 'd': pk_nodefaultkeys(); break; case 'D': debugging = 1; break; case 'v': warn = 1; break; case 'p': path = optarg; break; default: usage(); } load_des(warn, path); __des_crypt_LOCAL = _my_crypt; if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) errx(1, "failed to register AUTH_DES authenticator"); if (optind != argc) { usage(); } /* * Initialize */ umask(066); /* paranoia */ if (geteuid() != 0) errx(1, "keyserv must be run as root"); setmodulus(HEXMODULUS); getrootkey(&masterkey, nflag); /* Create services. */ pmap_unset(KEY_PROG, KEY_VERS); pmap_unset(KEY_PROG, KEY_VERS2); unlink(KEYSERVSOCK); transp = svcudp_create(RPC_ANYSOCK); if (transp == NULL) errx(1, "cannot create udp service"); if (!svc_register(transp, KEY_PROG, KEY_VERS, keyprogram, IPPROTO_UDP)) errx(1, "unable to register (KEY_PROG, KEY_VERS, udp)"); if (!svc_register(transp, KEY_PROG, KEY_VERS2, keyprogram, IPPROTO_UDP)) errx(1, "unable to register (KEY_PROG, KEY_VERS2, udp)"); transp = svctcp_create(RPC_ANYSOCK, 0, 0); if (transp == NULL) errx(1, "cannot create tcp service"); if (!svc_register(transp, KEY_PROG, KEY_VERS, keyprogram, IPPROTO_TCP)) errx(1, "unable to register (KEY_PROG, KEY_VERS, tcp)"); if (!svc_register(transp, KEY_PROG, KEY_VERS2, keyprogram, IPPROTO_TCP)) errx(1, "unable to register (KEY_PROG, KEY_VERS2, tcp)"); transp = svcunix_create(sock, 0, 0, KEYSERVSOCK); chmod(KEYSERVSOCK, 0666); if (transp == NULL) errx(1, "cannot create AF_UNIX service"); if (!svc_register(transp, KEY_PROG, KEY_VERS, keyprogram, 0)) errx(1, "unable to register (KEY_PROG, KEY_VERS, unix)"); if (!svc_register(transp, KEY_PROG, KEY_VERS2, keyprogram, 0)) errx(1, "unable to register (KEY_PROG, KEY_VERS2, unix)"); if (!svc_register(transp, CRYPT_PROG, CRYPT_VERS, crypt_prog_1, 0)) errx(1, "unable to register (CRYPT_PROG, CRYPT_VERS, unix)"); if (!debugging) { daemon(0,0); } signal(SIGPIPE, SIG_IGN); svc_run(); abort(); /* NOTREACHED */ } /* * In the event that we don't get a root password, we try to * randomize the master key the best we can */ static void randomize(des_block *master) { int i; int seed; struct timeval tv; int shift; seed = 0; for (i = 0; i < 1024; i++) { gettimeofday(&tv, (struct timezone *) NULL); shift = i % 8 * sizeof (int); seed ^= (tv.tv_usec << shift) | (tv.tv_usec >> (32 - shift)); } #ifdef KEYSERV_RANDOM srandom(seed); master->key.low = random(); master->key.high = random(); srandom(seed); #else /* use stupid dangerous bad rand() */ srand(seed); master->key.low = rand(); master->key.high = rand(); srand(seed); #endif } /* * Try to get root's secret key, by prompting if terminal is a tty, else trying * from standard input. * Returns 1 on success. */ static int getrootkey(des_block *master, int prompt) { char *passwd; char name[MAXNETNAMELEN + 1]; char secret[HEXKEYBYTES]; key_netstarg netstore; int fd; if (!prompt) { /* * Read secret key out of ROOTKEY */ fd = open(ROOTKEY, O_RDONLY, 0); if (fd < 0) { randomize(master); return (0); } if (read(fd, secret, HEXKEYBYTES) < HEXKEYBYTES) { warnx("the key read from %s was too short", ROOTKEY); close(fd); return (0); } close(fd); if (!getnetname(name)) { warnx( "failed to generate host's netname when establishing root's key"); return (0); } memcpy(netstore.st_priv_key, secret, HEXKEYBYTES); memset(netstore.st_pub_key, 0, HEXKEYBYTES); netstore.st_netname = name; if (pk_netput(0, &netstore) != KEY_SUCCESS) { warnx("could not set root's key and netname"); return (0); } return (1); } /* * Decrypt yellow pages publickey entry to get secret key */ passwd = getpass("root password:"); passwd2des(passwd, (char *)master); getnetname(name); if (!getsecretkey(name, secret, passwd)) { warnx("can't find %s's secret key", name); return (0); } if (secret[0] == 0) { warnx("password does not decrypt secret key for %s", name); return (0); } pk_setkey(0, secret); /* * Store it for future use in $ROOTKEY, if possible */ fd = open(ROOTKEY, O_WRONLY|O_TRUNC|O_CREAT, 0); if (fd > 0) { char newline = '\n'; write(fd, secret, strlen(secret)); write(fd, &newline, sizeof (newline)); close(fd); } return (1); } /* * Procedures to implement RPC service */ char * strstatus(keystatus status) { switch (status) { case KEY_SUCCESS: return ("KEY_SUCCESS"); case KEY_NOSECRET: return ("KEY_NOSECRET"); case KEY_UNKNOWN: return ("KEY_UNKNOWN"); case KEY_SYSTEMERR: return ("KEY_SYSTEMERR"); default: return ("(bad result code)"); } } keystatus * key_set_1_svc_prog(uid_t uid, keybuf key) { static keystatus status; if (debugging) { fprintf(stderr, "set(%ld, %.*s) = ", uid, (int) sizeof (keybuf), key); } status = pk_setkey(uid, key); if (debugging) { fprintf(stderr, "%s\n", strstatus(status)); fflush(stderr); } return (&status); } cryptkeyres * key_encrypt_pk_2_svc_prog(uid_t uid, cryptkeyarg2 *arg) { static cryptkeyres res; if (debugging) { fprintf(stderr, "encrypt(%ld, %s, %08x%08x) = ", uid, arg->remotename, arg->deskey.key.high, arg->deskey.key.low); } res.cryptkeyres_u.deskey = arg->deskey; res.status = pk_encrypt(uid, arg->remotename, &(arg->remotekey), &res.cryptkeyres_u.deskey); if (debugging) { if (res.status == KEY_SUCCESS) { fprintf(stderr, "%08x%08x\n", res.cryptkeyres_u.deskey.key.high, res.cryptkeyres_u.deskey.key.low); } else { fprintf(stderr, "%s\n", strstatus(res.status)); } fflush(stderr); } return (&res); } cryptkeyres * key_decrypt_pk_2_svc_prog(uid_t uid, cryptkeyarg2 *arg) { static cryptkeyres res; if (debugging) { fprintf(stderr, "decrypt(%ld, %s, %08x%08x) = ", uid, arg->remotename, arg->deskey.key.high, arg->deskey.key.low); } res.cryptkeyres_u.deskey = arg->deskey; res.status = pk_decrypt(uid, arg->remotename, &(arg->remotekey), &res.cryptkeyres_u.deskey); if (debugging) { if (res.status == KEY_SUCCESS) { fprintf(stderr, "%08x%08x\n", res.cryptkeyres_u.deskey.key.high, res.cryptkeyres_u.deskey.key.low); } else { fprintf(stderr, "%s\n", strstatus(res.status)); } fflush(stderr); } return (&res); } keystatus * key_net_put_2_svc_prog(uid_t uid, key_netstarg *arg) { static keystatus status; if (debugging) { fprintf(stderr, "net_put(%s, %.*s, %.*s) = ", arg->st_netname, (int)sizeof (arg->st_pub_key), arg->st_pub_key, (int)sizeof (arg->st_priv_key), arg->st_priv_key); }; status = pk_netput(uid, arg); if (debugging) { fprintf(stderr, "%s\n", strstatus(status)); fflush(stderr); } return (&status); } key_netstres * key_net_get_2_svc_prog(uid_t uid, void *arg) { static key_netstres keynetname; if (debugging) fprintf(stderr, "net_get(%ld) = ", uid); keynetname.status = pk_netget(uid, &keynetname.key_netstres_u.knet); if (debugging) { if (keynetname.status == KEY_SUCCESS) { fprintf(stderr, "<%s, %.*s, %.*s>\n", keynetname.key_netstres_u.knet.st_netname, (int)sizeof (keynetname.key_netstres_u.knet.st_pub_key), keynetname.key_netstres_u.knet.st_pub_key, (int)sizeof (keynetname.key_netstres_u.knet.st_priv_key), keynetname.key_netstres_u.knet.st_priv_key); } else { fprintf(stderr, "NOT FOUND\n"); } fflush(stderr); } return (&keynetname); } cryptkeyres * key_get_conv_2_svc_prog(uid_t uid, keybuf arg) { static cryptkeyres res; if (debugging) fprintf(stderr, "get_conv(%ld, %.*s) = ", uid, (int)sizeof (arg), arg); res.status = pk_get_conv_key(uid, arg, &res); if (debugging) { if (res.status == KEY_SUCCESS) { fprintf(stderr, "%08x%08x\n", res.cryptkeyres_u.deskey.key.high, res.cryptkeyres_u.deskey.key.low); } else { fprintf(stderr, "%s\n", strstatus(res.status)); } fflush(stderr); } return (&res); } cryptkeyres * key_encrypt_1_svc_prog(uid_t uid, cryptkeyarg *arg) { static cryptkeyres res; if (debugging) { fprintf(stderr, "encrypt(%ld, %s, %08x%08x) = ", uid, arg->remotename, arg->deskey.key.high, arg->deskey.key.low); } res.cryptkeyres_u.deskey = arg->deskey; res.status = pk_encrypt(uid, arg->remotename, NULL, &res.cryptkeyres_u.deskey); if (debugging) { if (res.status == KEY_SUCCESS) { fprintf(stderr, "%08x%08x\n", res.cryptkeyres_u.deskey.key.high, res.cryptkeyres_u.deskey.key.low); } else { fprintf(stderr, "%s\n", strstatus(res.status)); } fflush(stderr); } return (&res); } cryptkeyres * key_decrypt_1_svc_prog(uid_t uid, cryptkeyarg *arg) { static cryptkeyres res; if (debugging) { fprintf(stderr, "decrypt(%ld, %s, %08x%08x) = ", uid, arg->remotename, arg->deskey.key.high, arg->deskey.key.low); } res.cryptkeyres_u.deskey = arg->deskey; res.status = pk_decrypt(uid, arg->remotename, NULL, &res.cryptkeyres_u.deskey); if (debugging) { if (res.status == KEY_SUCCESS) { fprintf(stderr, "%08x%08x\n", res.cryptkeyres_u.deskey.key.high, res.cryptkeyres_u.deskey.key.low); } else { fprintf(stderr, "%s\n", strstatus(res.status)); } fflush(stderr); } return (&res); } /* ARGSUSED */ des_block * key_gen_1_svc_prog(void *v, struct svc_req *s) { struct timeval time; static des_block keygen; static des_block key; gettimeofday(&time, (struct timezone *) NULL); keygen.key.high += (time.tv_sec ^ time.tv_usec); keygen.key.low += (time.tv_sec ^ time.tv_usec); ecb_crypt((char *)&masterkey, (char *)&keygen, sizeof (keygen), DES_ENCRYPT | DES_HW); key = keygen; des_setparity((char *)&key); if (debugging) { fprintf(stderr, "gen() = %08x%08x\n", key.key.high, key.key.low); fflush(stderr); } return (&key); } getcredres * key_getcred_1_svc_prog(uid_t uid, netnamestr *name) { static getcredres res; static u_int gids[NGROUPS]; struct unixcred *cred; cred = &res.getcredres_u.cred; cred->gids.gids_val = gids; if (!netname2user(*name, (uid_t *) &cred->uid, (gid_t *) &cred->gid, (int *)&cred->gids.gids_len, (gid_t *)gids)) { res.status = KEY_UNKNOWN; } else { res.status = KEY_SUCCESS; } if (debugging) { fprintf(stderr, "getcred(%s) = ", *name); if (res.status == KEY_SUCCESS) { fprintf(stderr, "uid=%d, gid=%d, grouplen=%d\n", cred->uid, cred->gid, cred->gids.gids_len); } else { fprintf(stderr, "%s\n", strstatus(res.status)); } fflush(stderr); } return (&res); } /* * RPC boilerplate */ static void keyprogram(struct svc_req *rqstp, SVCXPRT *transp) { union { keybuf key_set_1_arg; cryptkeyarg key_encrypt_1_arg; cryptkeyarg key_decrypt_1_arg; netnamestr key_getcred_1_arg; cryptkeyarg key_encrypt_2_arg; cryptkeyarg key_decrypt_2_arg; netnamestr key_getcred_2_arg; cryptkeyarg2 key_encrypt_pk_2_arg; cryptkeyarg2 key_decrypt_pk_2_arg; key_netstarg key_net_put_2_arg; netobj key_get_conv_2_arg; } argument; char *result; bool_t(*xdr_argument)(), (*xdr_result)(); char *(*local) (); uid_t uid = -1; int check_auth; switch (rqstp->rq_proc) { case NULLPROC: svc_sendreply(transp, xdr_void, (char *)NULL); return; case KEY_SET: xdr_argument = xdr_keybuf; xdr_result = xdr_int; local = (char *(*)()) key_set_1_svc_prog; check_auth = 1; break; case KEY_ENCRYPT: xdr_argument = xdr_cryptkeyarg; xdr_result = xdr_cryptkeyres; local = (char *(*)()) key_encrypt_1_svc_prog; check_auth = 1; break; case KEY_DECRYPT: xdr_argument = xdr_cryptkeyarg; xdr_result = xdr_cryptkeyres; local = (char *(*)()) key_decrypt_1_svc_prog; check_auth = 1; break; case KEY_GEN: xdr_argument = xdr_void; xdr_result = xdr_des_block; local = (char *(*)()) key_gen_1_svc_prog; check_auth = 0; break; case KEY_GETCRED: xdr_argument = xdr_netnamestr; xdr_result = xdr_getcredres; local = (char *(*)()) key_getcred_1_svc_prog; check_auth = 0; break; case KEY_ENCRYPT_PK: xdr_argument = xdr_cryptkeyarg2; xdr_result = xdr_cryptkeyres; local = (char *(*)()) key_encrypt_pk_2_svc_prog; check_auth = 1; break; case KEY_DECRYPT_PK: xdr_argument = xdr_cryptkeyarg2; xdr_result = xdr_cryptkeyres; local = (char *(*)()) key_decrypt_pk_2_svc_prog; check_auth = 1; break; case KEY_NET_PUT: xdr_argument = xdr_key_netstarg; xdr_result = xdr_keystatus; local = (char *(*)()) key_net_put_2_svc_prog; check_auth = 1; break; case KEY_NET_GET: xdr_argument = (xdrproc_t) xdr_void; xdr_result = xdr_key_netstres; local = (char *(*)()) key_net_get_2_svc_prog; check_auth = 1; break; case KEY_GET_CONV: xdr_argument = (xdrproc_t) xdr_keybuf; xdr_result = xdr_cryptkeyres; local = (char *(*)()) key_get_conv_2_svc_prog; check_auth = 1; break; default: svcerr_noproc(transp); return; } if (check_auth) { if (root_auth(transp, rqstp) == 0) { if (debugging) { fprintf(stderr, "not local privileged process\n"); } svcerr_weakauth(transp); return; } if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { if (debugging) { fprintf(stderr, "not unix authentication\n"); } svcerr_weakauth(transp); return; } uid = ((struct authsys_parms *)rqstp->rq_clntcred)->aup_uid; } memset((char *) &argument, 0, sizeof (argument)); if (!svc_getargs(transp, xdr_argument, (caddr_t)&argument)) { svcerr_decode(transp); return; } result = (*local) (uid, &argument); if (!svc_sendreply(transp, xdr_result, (char *) result)) { if (debugging) fprintf(stderr, "unable to reply\n"); svcerr_systemerr(transp); } if (!svc_freeargs(transp, xdr_argument, (caddr_t)&argument)) { if (debugging) fprintf(stderr, "unable to free arguments\n"); exit(1); } return; } static int root_auth(SVCXPRT *trans, struct svc_req *rqstp) { uid_t uid; struct sockaddr_in *remote; remote = svc_getcaller(trans); if (remote->sin_family == AF_INET) { if (debugging) fprintf(stderr, "client didn't use AF_UNIX\n"); return (0); } if (__rpc_get_local_uid(&uid, trans) < 0) { if (debugging) fprintf(stderr, "__rpc_get_local_uid failed\n"); return (0); } if (debugging) fprintf(stderr, "local_uid %ld\n", uid); if (uid == 0) return (1); if (rqstp->rq_cred.oa_flavor == AUTH_SYS) { if (((uid_t) ((struct authunix_parms *) rqstp->rq_clntcred)->aup_uid) == uid) { return (1); } else { if (debugging) fprintf(stderr, "local_uid %ld mismatches auth %ld\n", uid, ((uid_t) ((struct authunix_parms *)rqstp->rq_clntcred)->aup_uid)); return (0); } } else { if (debugging) fprintf(stderr, "Not auth sys\n"); return (0); } } static void usage(void) { fprintf(stderr, "usage: keyserv [-n] [-D] [-d] [-v] [-p path]\n"); fprintf(stderr, "-d disables the use of default keys\n"); exit(1); }