1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #if defined(LIBC_SCCS) && !defined(lint) 32 static char sccsid[] = "@(#)netnamer.c 1.13 91/03/11 Copyr 1986 Sun Micro"; 33 #endif 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 /* 38 * netname utility routines convert from unix names to network names and 39 * vice-versa This module is operating system dependent! What we define here 40 * will work with any unix system that has adopted the sun NIS domain 41 * architecture. 42 */ 43 #include "namespace.h" 44 #include <sys/param.h> 45 #include <rpc/rpc.h> 46 #include <rpc/rpc_com.h> 47 #ifdef YP 48 #include <rpcsvc/yp_prot.h> 49 #include <rpcsvc/ypclnt.h> 50 #endif 51 #include <ctype.h> 52 #include <stdio.h> 53 #include <grp.h> 54 #include <pwd.h> 55 #include <string.h> 56 #include <stdlib.h> 57 #include <unistd.h> 58 #include "un-namespace.h" 59 60 static char *OPSYS = "unix"; 61 #ifdef YP 62 static char *NETID = "netid.byname"; 63 #endif 64 static char *NETIDFILE = "/etc/netid"; 65 66 static int getnetid( char *, char * ); 67 static int _getgroups( char *, gid_t * ); 68 69 /* 70 * Convert network-name into unix credential 71 */ 72 int 73 netname2user(char netname[MAXNETNAMELEN + 1], uid_t *uidp, gid_t *gidp, 74 int *gidlenp, gid_t *gidlist) 75 { 76 char *p; 77 int gidlen; 78 uid_t uid; 79 long luid; 80 struct passwd *pwd; 81 char val[1024]; 82 char *val1, *val2; 83 char *domain; 84 int vallen; 85 int err; 86 87 if (getnetid(netname, val)) { 88 char *res = val; 89 90 p = strsep(&res, ":"); 91 if (p == NULL) 92 return (0); 93 *uidp = (uid_t) atol(p); 94 p = strsep(&res, "\n,"); 95 if (p == NULL) { 96 return (0); 97 } 98 *gidp = (gid_t) atol(p); 99 for (gidlen = 0; gidlen < NGRPS; gidlen++) { 100 p = strsep(&res, "\n,"); 101 if (p == NULL) 102 break; 103 gidlist[gidlen] = (gid_t) atol(p); 104 } 105 *gidlenp = gidlen; 106 107 return (1); 108 } 109 val1 = strchr(netname, '.'); 110 if (val1 == NULL) 111 return (0); 112 if (strncmp(netname, OPSYS, (val1-netname))) 113 return (0); 114 val1++; 115 val2 = strchr(val1, '@'); 116 if (val2 == NULL) 117 return (0); 118 vallen = val2 - val1; 119 if (vallen > (1024 - 1)) 120 vallen = 1024 - 1; 121 (void) strncpy(val, val1, 1024); 122 val[vallen] = 0; 123 124 err = __rpc_get_default_domain(&domain); /* change to rpc */ 125 if (err) 126 return (0); 127 128 if (strcmp(val2 + 1, domain)) 129 return (0); /* wrong domain */ 130 131 if (sscanf(val, "%ld", &luid) != 1) 132 return (0); 133 uid = luid; 134 135 /* use initgroups method */ 136 pwd = getpwuid(uid); 137 if (pwd == NULL) 138 return (0); 139 *uidp = pwd->pw_uid; 140 *gidp = pwd->pw_gid; 141 *gidlenp = _getgroups(pwd->pw_name, gidlist); 142 return (1); 143 } 144 145 /* 146 * initgroups 147 */ 148 149 static int 150 _getgroups(char *uname, gid_t groups[NGRPS]) 151 { 152 gid_t ngroups = 0; 153 struct group *grp; 154 int i; 155 int j; 156 int filter; 157 158 setgrent(); 159 while ((grp = getgrent())) { 160 for (i = 0; grp->gr_mem[i]; i++) 161 if (!strcmp(grp->gr_mem[i], uname)) { 162 if (ngroups == NGRPS) { 163 #ifdef DEBUG 164 fprintf(stderr, 165 "initgroups: %s is in too many groups\n", uname); 166 #endif 167 goto toomany; 168 } 169 /* filter out duplicate group entries */ 170 filter = 0; 171 for (j = 0; j < ngroups; j++) 172 if (groups[j] == grp->gr_gid) { 173 filter++; 174 break; 175 } 176 if (!filter) 177 groups[ngroups++] = grp->gr_gid; 178 } 179 } 180 toomany: 181 endgrent(); 182 return (ngroups); 183 } 184 185 /* 186 * Convert network-name to hostname 187 */ 188 int 189 netname2host(char netname[MAXNETNAMELEN + 1], char *hostname, int hostlen) 190 { 191 int err; 192 char valbuf[1024]; 193 char *val; 194 char *val2; 195 int vallen; 196 char *domain; 197 198 if (getnetid(netname, valbuf)) { 199 val = valbuf; 200 if ((*val == '0') && (val[1] == ':')) { 201 (void) strncpy(hostname, val + 2, hostlen); 202 return (1); 203 } 204 } 205 val = strchr(netname, '.'); 206 if (val == NULL) 207 return (0); 208 if (strncmp(netname, OPSYS, (val - netname))) 209 return (0); 210 val++; 211 val2 = strchr(val, '@'); 212 if (val2 == NULL) 213 return (0); 214 vallen = val2 - val; 215 if (vallen > (hostlen - 1)) 216 vallen = hostlen - 1; 217 (void) strncpy(hostname, val, vallen); 218 hostname[vallen] = 0; 219 220 err = __rpc_get_default_domain(&domain); /* change to rpc */ 221 if (err) 222 return (0); 223 224 if (strcmp(val2 + 1, domain)) 225 return (0); /* wrong domain */ 226 else 227 return (1); 228 } 229 230 /* 231 * reads the file /etc/netid looking for a + to optionally go to the 232 * network information service. 233 */ 234 int 235 getnetid(char *key, char *ret) 236 { 237 char buf[1024]; /* big enough */ 238 char *res; 239 char *mkey; 240 char *mval; 241 FILE *fd; 242 #ifdef YP 243 char *domain; 244 int err; 245 char *lookup; 246 int len; 247 #endif 248 int rv; 249 250 rv = 0; 251 252 fd = fopen(NETIDFILE, "r"); 253 if (fd == NULL) { 254 #ifdef YP 255 res = "+"; 256 goto getnetidyp; 257 #else 258 return (0); 259 #endif 260 } 261 while (fd != NULL) { 262 res = fgets(buf, sizeof(buf), fd); 263 if (res == NULL) { 264 rv = 0; 265 goto done; 266 } 267 if (res[0] == '#') 268 continue; 269 else if (res[0] == '+') { 270 #ifdef YP 271 getnetidyp: 272 err = yp_get_default_domain(&domain); 273 if (err) { 274 continue; 275 } 276 lookup = NULL; 277 err = yp_match(domain, NETID, key, 278 strlen(key), &lookup, &len); 279 if (err) { 280 #ifdef DEBUG 281 fprintf(stderr, "match failed error %d\n", err); 282 #endif 283 continue; 284 } 285 lookup[len] = 0; 286 strcpy(ret, lookup); 287 free(lookup); 288 rv = 2; 289 goto done; 290 #else /* YP */ 291 #ifdef DEBUG 292 fprintf(stderr, 293 "Bad record in %s '+' -- NIS not supported in this library copy\n", 294 NETIDFILE); 295 #endif 296 continue; 297 #endif /* YP */ 298 } else { 299 mkey = strsep(&res, "\t "); 300 if (mkey == NULL) { 301 fprintf(stderr, 302 "Bad record in %s -- %s", NETIDFILE, buf); 303 continue; 304 } 305 do { 306 mval = strsep(&res, " \t#\n"); 307 } while (mval != NULL && !*mval); 308 if (mval == NULL) { 309 fprintf(stderr, 310 "Bad record in %s val problem - %s", NETIDFILE, buf); 311 continue; 312 } 313 if (strcmp(mkey, key) == 0) { 314 strcpy(ret, mval); 315 rv = 1; 316 goto done; 317 } 318 } 319 } 320 321 done: 322 if (fd != NULL) 323 fclose(fd); 324 return (rv); 325 } 326