lib/libc/rpc/netnamer.c

   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 }