lib/libc/rpc/netnamer.c

   1 /*-
   2  * Copyright (c) 2009, Sun Microsystems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/lib/libc/rpc/netnamer.c,v 1.12 2005/03/10 00:58:21 stefanf Exp $
  29  * $DragonFly: src/lib/libc/rpc/netnamer.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
  30  *
  31  * @(#)netnamer.c 1.13 91/03/11 Copyr 1986 Sun Micro
  32  */
  33
  34 /*
  35  * netname utility routines convert from unix names to network names and
  36  * vice-versa This module is operating system dependent! What we define here
  37  * will work with any unix system that has adopted the sun NIS domain
  38  * architecture.
  39  */
  40 #include "namespace.h"
  41 #include <sys/param.h>
  42 #include <rpc/rpc.h>
  43 #include <rpc/rpc_com.h>
  44 #ifdef YP
  45 #include <rpcsvc/yp_prot.h>
  46 #include <rpcsvc/ypclnt.h>
  47 #endif
  48 #include <ctype.h>
  49 #include <stdio.h>
  50 #include <grp.h>
  51 #include <pwd.h>
  52 #include <string.h>
  53 #include <stdlib.h>
  54 #include <unistd.h>
  55 #include "un-namespace.h"
  56
  57 static char    *OPSYS = "unix";
  58 #ifdef YP
  59 static char    *NETID = "netid.byname";
  60 #endif
  61 static char    *NETIDFILE = "/etc/netid";
  62
  63 static int      _getgroups(char *, gid_t *);
  64 static int       getnetid(char *, char *);
  65
  66 #ifndef NGROUPS
  67 #define NGROUPS 16
  68 #endif
  69
  70 /*
  71  * Convert network-name into unix credential
  72  */
  73 int
  74 netname2user(char *netname, uid_t *uidp, gid_t *gidp, int *gidlenp,
  75              gid_t *gidlist)
  76 {
  77         char           *p;
  78         int             gidlen;
  79         uid_t           uid;
  80         long            luid;
  81         struct passwd  *pwd;
  82         char            val[1024];
  83         char           *val1, *val2;
  84         char           *domain;
  85         int             vallen;
  86         int             err;
  87
  88         if (getnetid(netname, val)) {
  89                 char *res = val;
  90
  91                 p = strsep(&res, ":");
  92                 if (p == NULL)
  93                         return (0);
  94                 *uidp = (uid_t) atol(p);
  95                 p = strsep(&res, "\n,");
  96                 if (p == NULL) {
  97                         return (0);
  98                 }
  99                 *gidp = (gid_t) atol(p);
 100                 for (gidlen = 0; gidlen < NGROUPS; gidlen++) {
 101                         p = strsep(&res, "\n,");
 102                         if (p == NULL)
 103                                 break;
 104                         gidlist[gidlen] = (gid_t) atol(p);
 105                 }
 106                 *gidlenp = gidlen;
 107
 108                 return (1);
 109         }
 110         val1 = strchr(netname, '.');
 111         if (val1 == NULL)
 112                 return (0);
 113         if (strncmp(netname, OPSYS, (val1-netname)))
 114                 return (0);
 115         val1++;
 116         val2 = strchr(val1, '@');
 117         if (val2 == NULL)
 118                 return (0);
 119         vallen = val2 - val1;
 120         if (vallen > (1024 - 1))
 121                 vallen = 1024 - 1;
 122         strncpy(val, val1, 1024);
 123         val[vallen] = 0;
 124
 125         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 126         if (err)
 127                 return (0);
 128
 129         if (strcmp(val2 + 1, domain))
 130                 return (0);     /* wrong domain */
 131
 132         if (sscanf(val, "%ld", &luid) != 1)
 133                 return (0);
 134         uid = luid;
 135
 136         /* use initgroups method */
 137         pwd = getpwuid(uid);
 138         if (pwd == NULL)
 139                 return (0);
 140         *uidp = pwd->pw_uid;
 141         *gidp = pwd->pw_gid;
 142         *gidlenp = _getgroups(pwd->pw_name, gidlist);
 143         return (1);
 144 }
 145
 146 /*
 147  * initgroups
 148  */
 149
 150 static int
 151 _getgroups(char *uname, gid_t *groups)
 152 {
 153         gid_t           ngroups = 0;
 154         struct group *grp;
 155         int    i;
 156         int    j;
 157         int             filter;
 158
 159         setgrent();
 160         while ((grp = getgrent())) {
 161                 for (i = 0; grp->gr_mem[i]; i++)
 162                         if (!strcmp(grp->gr_mem[i], uname)) {
 163                                 if (ngroups == NGROUPS) {
 164 #ifdef DEBUG
 165                                         fprintf(stderr,
 166                                 "initgroups: %s is in too many groups\n", uname);
 167 #endif
 168                                         goto toomany;
 169                                 }
 170                                 /* filter out duplicate group entries */
 171                                 filter = 0;
 172                                 for (j = 0; j < ngroups; j++)
 173                                         if (groups[j] == grp->gr_gid) {
 174                                                 filter++;
 175                                                 break;
 176                                         }
 177                                 if (!filter)
 178                                         groups[ngroups++] = grp->gr_gid;
 179                         }
 180         }
 181 toomany:
 182         endgrent();
 183         return (ngroups);
 184 }
 185
 186 /*
 187  * Convert network-name to hostname
 188  */
 189 int
 190 netname2host(char *netname, char *hostname, int hostlen)
 191 {
 192         int             err;
 193         char            valbuf[1024];
 194         char           *val;
 195         char           *val2;
 196         int             vallen;
 197         char           *domain;
 198
 199         if (getnetid(netname, valbuf)) {
 200                 val = valbuf;
 201                 if ((*val == '0') && (val[1] == ':')) {
 202                         strncpy(hostname, val + 2, hostlen);
 203                         return (1);
 204                 }
 205         }
 206         val = strchr(netname, '.');
 207         if (val == NULL)
 208                 return (0);
 209         if (strncmp(netname, OPSYS, (val - netname)))
 210                 return (0);
 211         val++;
 212         val2 = strchr(val, '@');
 213         if (val2 == NULL)
 214                 return (0);
 215         vallen = val2 - val;
 216         if (vallen > (hostlen - 1))
 217                 vallen = hostlen - 1;
 218         strncpy(hostname, val, vallen);
 219         hostname[vallen] = 0;
 220
 221         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 222         if (err)
 223                 return (0);
 224
 225         if (strcmp(val2 + 1, domain))
 226                 return (0);     /* wrong domain */
 227         else
 228                 return (1);
 229 }
 230
 231 /*
 232  * reads the file /etc/netid looking for a + to optionally go to the
 233  * network information service.
 234  */
 235 static int
 236 getnetid(char *key, char *ret)
 237 {
 238         char            buf[1024];      /* big enough */
 239         char           *res;
 240         char           *mkey;
 241         char           *mval;
 242         FILE           *fd;
 243 #ifdef YP
 244         char           *domain;
 245         int             err;
 246         char           *lookup;
 247         int             len;
 248 #endif
 249
 250         fd = fopen(NETIDFILE, "r");
 251         if (fd == NULL) {
 252 #ifdef YP
 253                 res = "+";
 254                 goto getnetidyp;
 255 #else
 256                 return (0);
 257 #endif
 258         }
 259         for (;;) {
 260                 if (fd == NULL)
 261                         return (0);     /* getnetidyp brings us here */
 262                 res = fgets(buf, sizeof(buf), fd);
 263                 if (res == NULL) {
 264                         fclose(fd);
 265                         return (0);
 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                         if (fd != NULL)
 289                                 fclose(fd);
 290                         return (2);
 291 #else   /* YP */
 292 #ifdef DEBUG
 293                         fprintf(stderr,
 294 "Bad record in %s '+' -- NIS not supported in this library copy\n",
 295                                 NETIDFILE);
 296 #endif
 297                         continue;
 298 #endif  /* YP */
 299                 } else {
 300                         mkey = strsep(&res, "\t ");
 301                         if (mkey == NULL) {
 302                                 fprintf(stderr,
 303                 "Bad record in %s -- %s", NETIDFILE, buf);
 304                                 continue;
 305                         }
 306                         do {
 307                                 mval = strsep(&res, " \t#\n");
 308                         } while (mval != NULL && !*mval);
 309                         if (mval == NULL) {
 310                                 fprintf(stderr,
 311                 "Bad record in %s val problem - %s", NETIDFILE, buf);
 312                                 continue;
 313                         }
 314                         if (strcmp(mkey, key) == 0) {
 315                                 strcpy(ret, mval);
 316                                 fclose(fd);
 317                                 return (1);
 318
 319                         }
 320                 }
 321         }
 322 }