1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * This software was developed for the FreeBSD Project by ThinkSec AS and 8 * NAI Labs, the Security Research Division of Network Associates, Inc. 9 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 10 * DARPA CHATS research program. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. The name of the author may not be used to endorse or promote 21 * products derived from this software without specific prior written 22 * permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/types.h> 38 #include <sys/socket.h> 39 #include <netinet/in.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <netconfig.h> 44 #include <netdb.h> 45 #include <pwd.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include <rpcsvc/ypclnt.h> 51 #include <rpcsvc/yppasswd.h> 52 53 #include "ypclnt.h" 54 #include "yppasswd_private.h" 55 56 static int yppasswd_remote(ypclnt_t *, const struct passwd *, const char *); 57 static int yppasswd_local(ypclnt_t *, const struct passwd *); 58 59 /* 60 * Determines the availability of rpc.yppasswdd. Returns -1 for not 61 * available (or unable to determine), 0 for available, 1 for available in 62 * master mode. 63 */ 64 int 65 ypclnt_havepasswdd(ypclnt_t *ypclnt) 66 { 67 struct netconfig *nc = NULL; 68 void *localhandle = NULL; 69 CLIENT *clnt = NULL; 70 int ret; 71 72 /* check if rpc.yppasswdd is running */ 73 if (getrpcport(ypclnt->server, YPPASSWDPROG, 74 YPPASSWDPROC_UPDATE, IPPROTO_UDP) == 0) { 75 ypclnt_error(ypclnt, __func__, "no rpc.yppasswdd on server"); 76 return (-1); 77 } 78 79 /* if we're not root, use remote method */ 80 if (getuid() != 0) 81 return (0); 82 83 /* try to connect to rpc.yppasswdd */ 84 localhandle = setnetconfig(); 85 while ((nc = getnetconfig(localhandle)) != NULL) { 86 if (nc->nc_protofmly != NULL && 87 strcmp(nc->nc_protofmly, NC_LOOPBACK) == 0) 88 break; 89 } 90 if (nc == NULL) { 91 ypclnt_error(ypclnt, __func__, 92 "getnetconfig: %s", nc_sperror()); 93 ret = 0; 94 goto done; 95 } 96 if ((clnt = clnt_tp_create(NULL, MASTER_YPPASSWDPROG, 97 MASTER_YPPASSWDVERS, nc)) == NULL) { 98 ypclnt_error(ypclnt, __func__, 99 "failed to connect to rpc.yppasswdd: %s", 100 clnt_spcreateerror(ypclnt->server)); 101 ret = 0; 102 goto done; 103 } else 104 ret = 1; 105 106 done: 107 if (clnt != NULL) { 108 clnt_destroy(clnt); 109 } 110 endnetconfig(localhandle); 111 return (ret); 112 } 113 114 /* 115 * Updates the NIS user information for the specified user. 116 */ 117 int 118 ypclnt_passwd(ypclnt_t *ypclnt, const struct passwd *pwd, const char *passwd) 119 { 120 switch (ypclnt_havepasswdd(ypclnt)) { 121 case 0: 122 return (yppasswd_remote(ypclnt, pwd, passwd)); 123 case 1: 124 return (yppasswd_local(ypclnt, pwd)); 125 default: 126 return (-1); 127 } 128 } 129 130 /* 131 * yppasswd_remote and yppasswd_local are quite similar but still 132 * sufficiently different that merging them into one makes the code 133 * significantly less readable, IMHO, so we keep them separate. 134 */ 135 136 static int 137 yppasswd_local(ypclnt_t *ypclnt, const struct passwd *pwd) 138 { 139 struct master_yppasswd yppwd; 140 struct rpc_err rpcerr; 141 struct netconfig *nc = NULL; 142 void *localhandle = NULL; 143 CLIENT *clnt = NULL; 144 int ret, *result; 145 146 /* fill the master_yppasswd structure */ 147 memset(&yppwd, 0, sizeof yppwd); 148 yppwd.newpw.pw_uid = pwd->pw_uid; 149 yppwd.newpw.pw_gid = pwd->pw_gid; 150 yppwd.newpw.pw_change = pwd->pw_change; 151 yppwd.newpw.pw_expire = pwd->pw_expire; 152 yppwd.newpw.pw_fields = pwd->pw_fields; 153 yppwd.oldpass = strdup(""); 154 yppwd.domain = strdup(ypclnt->domain); 155 if ((yppwd.newpw.pw_name = strdup(pwd->pw_name)) == NULL || 156 (yppwd.newpw.pw_passwd = strdup(pwd->pw_passwd)) == NULL || 157 (yppwd.newpw.pw_class = strdup(pwd->pw_class)) == NULL || 158 (yppwd.newpw.pw_gecos = strdup(pwd->pw_gecos)) == NULL || 159 (yppwd.newpw.pw_dir = strdup(pwd->pw_dir)) == NULL || 160 (yppwd.newpw.pw_shell = strdup(pwd->pw_shell)) == NULL) { 161 ypclnt_error(ypclnt, __func__, strerror(errno)); 162 ret = -1; 163 goto done; 164 } 165 166 /* connect to rpc.yppasswdd */ 167 localhandle = setnetconfig(); 168 while ((nc = getnetconfig(localhandle)) != NULL) { 169 if (nc->nc_protofmly != NULL && 170 strcmp(nc->nc_protofmly, NC_LOOPBACK) == 0) 171 break; 172 } 173 if (nc == NULL) { 174 ypclnt_error(ypclnt, __func__, 175 "getnetconfig: %s", nc_sperror()); 176 ret = -1; 177 goto done; 178 } 179 if ((clnt = clnt_tp_create(NULL, MASTER_YPPASSWDPROG, 180 MASTER_YPPASSWDVERS, nc)) == NULL) { 181 ypclnt_error(ypclnt, __func__, 182 "failed to connect to rpc.yppasswdd: %s", 183 clnt_spcreateerror(ypclnt->server)); 184 ret = -1; 185 goto done; 186 } 187 clnt->cl_auth = authunix_create_default(); 188 189 /* request the update */ 190 result = yppasswdproc_update_master_1(&yppwd, clnt); 191 192 /* check for RPC errors */ 193 clnt_geterr(clnt, &rpcerr); 194 if (rpcerr.re_status != RPC_SUCCESS) { 195 ypclnt_error(ypclnt, __func__, 196 "NIS password update failed: %s", 197 clnt_sperror(clnt, ypclnt->server)); 198 ret = -1; 199 goto done; 200 } 201 202 /* check the result of the update */ 203 if (result == NULL || *result != 0) { 204 ypclnt_error(ypclnt, __func__, 205 "NIS password update failed"); 206 /* XXX how do we get more details? */ 207 ret = -1; 208 goto done; 209 } 210 211 ypclnt_error(ypclnt, NULL, NULL); 212 ret = 0; 213 214 done: 215 if (clnt != NULL) { 216 auth_destroy(clnt->cl_auth); 217 clnt_destroy(clnt); 218 } 219 endnetconfig(localhandle); 220 free(yppwd.newpw.pw_name); 221 if (yppwd.newpw.pw_passwd != NULL) { 222 memset(yppwd.newpw.pw_passwd, 0, strlen(yppwd.newpw.pw_passwd)); 223 free(yppwd.newpw.pw_passwd); 224 } 225 free(yppwd.newpw.pw_class); 226 free(yppwd.newpw.pw_gecos); 227 free(yppwd.newpw.pw_dir); 228 free(yppwd.newpw.pw_shell); 229 if (yppwd.oldpass != NULL) { 230 memset(yppwd.oldpass, 0, strlen(yppwd.oldpass)); 231 free(yppwd.oldpass); 232 } 233 return (ret); 234 } 235 236 static int 237 yppasswd_remote(ypclnt_t *ypclnt, const struct passwd *pwd, const char *passwd) 238 { 239 struct yppasswd yppwd; 240 struct rpc_err rpcerr; 241 CLIENT *clnt = NULL; 242 int ret, *result; 243 244 /* fill the yppasswd structure */ 245 memset(&yppwd, 0, sizeof yppwd); 246 yppwd.newpw.pw_uid = pwd->pw_uid; 247 yppwd.newpw.pw_gid = pwd->pw_gid; 248 if ((yppwd.newpw.pw_name = strdup(pwd->pw_name)) == NULL || 249 (yppwd.newpw.pw_passwd = strdup(pwd->pw_passwd)) == NULL || 250 (yppwd.newpw.pw_gecos = strdup(pwd->pw_gecos)) == NULL || 251 (yppwd.newpw.pw_dir = strdup(pwd->pw_dir)) == NULL || 252 (yppwd.newpw.pw_shell = strdup(pwd->pw_shell)) == NULL || 253 (yppwd.oldpass = strdup(passwd ? passwd : "")) == NULL) { 254 ypclnt_error(ypclnt, __func__, strerror(errno)); 255 ret = -1; 256 goto done; 257 } 258 259 /* connect to rpc.yppasswdd */ 260 clnt = clnt_create(ypclnt->server, YPPASSWDPROG, YPPASSWDVERS, "udp"); 261 if (clnt == NULL) { 262 ypclnt_error(ypclnt, __func__, 263 "failed to connect to rpc.yppasswdd: %s", 264 clnt_spcreateerror(ypclnt->server)); 265 ret = -1; 266 goto done; 267 } 268 clnt->cl_auth = authunix_create_default(); 269 270 /* request the update */ 271 result = yppasswdproc_update_1(&yppwd, clnt); 272 273 /* check for RPC errors */ 274 clnt_geterr(clnt, &rpcerr); 275 if (rpcerr.re_status != RPC_SUCCESS) { 276 ypclnt_error(ypclnt, __func__, 277 "NIS password update failed: %s", 278 clnt_sperror(clnt, ypclnt->server)); 279 ret = -1; 280 goto done; 281 } 282 283 /* check the result of the update */ 284 if (result == NULL || *result != 0) { 285 ypclnt_error(ypclnt, __func__, 286 "NIS password update failed"); 287 /* XXX how do we get more details? */ 288 ret = -1; 289 goto done; 290 } 291 292 ypclnt_error(ypclnt, NULL, NULL); 293 ret = 0; 294 295 done: 296 if (clnt != NULL) { 297 auth_destroy(clnt->cl_auth); 298 clnt_destroy(clnt); 299 } 300 free(yppwd.newpw.pw_name); 301 if (yppwd.newpw.pw_passwd != NULL) { 302 memset(yppwd.newpw.pw_passwd, 0, strlen(yppwd.newpw.pw_passwd)); 303 free(yppwd.newpw.pw_passwd); 304 } 305 free(yppwd.newpw.pw_gecos); 306 free(yppwd.newpw.pw_dir); 307 free(yppwd.newpw.pw_shell); 308 if (yppwd.oldpass != NULL) { 309 memset(yppwd.oldpass, 0, strlen(yppwd.oldpass)); 310 free(yppwd.oldpass); 311 } 312 return (ret); 313 } 314