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
  29 #if defined(LIBC_SCCS) && !defined(lint)
  30 static char sccsid[] = "@(#)netnamer.c 1.13 91/03/11 Copyr 1986 Sun Micro";
  31 #endif
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 /*
  36  * netname utility routines convert from unix names to network names and
  37  * vice-versa This module is operating system dependent! What we define here
  38  * will work with any unix system that has adopted the sun NIS domain
  39  * architecture.
  40  */
  41 #include "namespace.h"
  42 #include <sys/param.h>
  43 #include <rpc/rpc.h>
  44 #include <rpc/rpc_com.h>
  45 #ifdef YP
  46 #include <rpcsvc/yp_prot.h>
  47 #include <rpcsvc/ypclnt.h>
  48 #endif
  49 #include <ctype.h>
  50 #include <stdio.h>
  51 #include <grp.h>
  52 #include <pwd.h>
  53 #include <string.h>
  54 #include <stdlib.h>
  55 #include <unistd.h>
  56 #include "un-namespace.h"
  57
  58 static char    *OPSYS = "unix";
  59 #ifdef YP
  60 static char    *NETID = "netid.byname";
  61 #endif
  62 static char    *NETIDFILE = "/etc/netid";
  63
  64 static int getnetid( char *, char * );
  65 static int _getgroups( char *, gid_t * );
  66
  67 /*
  68  * Convert network-name into unix credential
  69  */
  70 int
  71 netname2user(netname, uidp, gidp, gidlenp, gidlist)
  72         char            netname[MAXNETNAMELEN + 1];
  73         uid_t            *uidp;
  74         gid_t            *gidp;
  75         int            *gidlenp;
  76         gid_t          *gidlist;
  77 {
  78         char           *p;
  79         int             gidlen;
  80         uid_t           uid;
  81         long            luid;
  82         struct passwd  *pwd;
  83         char            val[1024];
  84         char           *val1, *val2;
  85         char           *domain;
  86         int             vallen;
  87         int             err;
  88
  89         if (getnetid(netname, val)) {
  90                 char *res = val;
  91
  92                 p = strsep(&res, ":");
  93                 if (p == NULL)
  94                         return (0);
  95                 *uidp = (uid_t) atol(p);
  96                 p = strsep(&res, "\n,");
  97                 if (p == NULL) {
  98                         return (0);
  99                 }
 100                 *gidp = (gid_t) atol(p);
 101                 for (gidlen = 0; gidlen < NGRPS; gidlen++) {
 102                         p = strsep(&res, "\n,");
 103                         if (p == NULL)
 104                                 break;
 105                         gidlist[gidlen] = (gid_t) atol(p);
 106                 }
 107                 *gidlenp = gidlen;
 108
 109                 return (1);
 110         }
 111         val1 = strchr(netname, '.');
 112         if (val1 == NULL)
 113                 return (0);
 114         if (strncmp(netname, OPSYS, (val1-netname)))
 115                 return (0);
 116         val1++;
 117         val2 = strchr(val1, '@');
 118         if (val2 == NULL)
 119                 return (0);
 120         vallen = val2 - val1;
 121         if (vallen > (1024 - 1))
 122                 vallen = 1024 - 1;
 123         (void) strncpy(val, val1, 1024);
 124         val[vallen] = 0;
 125
 126         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 127         if (err)
 128                 return (0);
 129
 130         if (strcmp(val2 + 1, domain))
 131                 return (0);     /* wrong domain */
 132
 133         if (sscanf(val, "%ld", &luid) != 1)
 134                 return (0);
 135         uid = luid;
 136
 137         /* use initgroups method */
 138         pwd = getpwuid(uid);
 139         if (pwd == NULL)
 140                 return (0);
 141         *uidp = pwd->pw_uid;
 142         *gidp = pwd->pw_gid;
 143         *gidlenp = _getgroups(pwd->pw_name, gidlist);
 144         return (1);
 145 }
 146
 147 /*
 148  * initgroups
 149  */
 150
 151 static int
 152 _getgroups(uname, groups)
 153         char           *uname;
 154         gid_t          groups[NGRPS];
 155 {
 156         gid_t           ngroups = 0;
 157         struct group *grp;
 158         int    i;
 159         int    j;
 160         int             filter;
 161
 162         setgrent();
 163         while ((grp = getgrent())) {
 164                 for (i = 0; grp->gr_mem[i]; i++)
 165                         if (!strcmp(grp->gr_mem[i], uname)) {
 166                                 if (ngroups == NGRPS) {
 167 #ifdef DEBUG
 168                                         fprintf(stderr,
 169                                 "initgroups: %s is in too many groups\n", uname);
 170 #endif
 171                                         goto toomany;
 172                                 }
 173                                 /* filter out duplicate group entries */
 174                                 filter = 0;
 175                                 for (j = 0; j < ngroups; j++)
 176                                         if (groups[j] == grp->gr_gid) {
 177                                                 filter++;
 178                                                 break;
 179                                         }
 180                                 if (!filter)
 181                                         groups[ngroups++] = grp->gr_gid;
 182                         }
 183         }
 184 toomany:
 185         endgrent();
 186         return (ngroups);
 187 }
 188
 189 /*
 190  * Convert network-name to hostname
 191  */
 192 int
 193 netname2host(netname, hostname, hostlen)
 194         char            netname[MAXNETNAMELEN + 1];
 195         char           *hostname;
 196         int             hostlen;
 197 {
 198         int             err;
 199         char            valbuf[1024];
 200         char           *val;
 201         char           *val2;
 202         int             vallen;
 203         char           *domain;
 204
 205         if (getnetid(netname, valbuf)) {
 206                 val = valbuf;
 207                 if ((*val == '0') && (val[1] == ':')) {
 208                         (void) strncpy(hostname, val + 2, hostlen);
 209                         return (1);
 210                 }
 211         }
 212         val = strchr(netname, '.');
 213         if (val == NULL)
 214                 return (0);
 215         if (strncmp(netname, OPSYS, (val - netname)))
 216                 return (0);
 217         val++;
 218         val2 = strchr(val, '@');
 219         if (val2 == NULL)
 220                 return (0);
 221         vallen = val2 - val;
 222         if (vallen > (hostlen - 1))
 223                 vallen = hostlen - 1;
 224         (void) strncpy(hostname, val, vallen);
 225         hostname[vallen] = 0;
 226
 227         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 228         if (err)
 229                 return (0);
 230
 231         if (strcmp(val2 + 1, domain))
 232                 return (0);     /* wrong domain */
 233         else
 234                 return (1);
 235 }
 236
 237 /*
 238  * reads the file /etc/netid looking for a + to optionally go to the
 239  * network information service.
 240  */
 241 int
 242 getnetid(key, ret)
 243         char           *key, *ret;
 244 {
 245         char            buf[1024];      /* big enough */
 246         char           *res;
 247         char           *mkey;
 248         char           *mval;
 249         FILE           *fd;
 250 #ifdef YP
 251         char           *domain;
 252         int             err;
 253         char           *lookup;
 254         int             len;
 255 #endif
 256
 257         fd = fopen(NETIDFILE, "r");
 258         if (fd == NULL) {
 259 #ifdef YP
 260                 res = "+";
 261                 goto getnetidyp;
 262 #else
 263                 return (0);
 264 #endif
 265         }
 266         for (;;) {
 267                 if (fd == NULL)
 268                         return (0);     /* getnetidyp brings us here */
 269                 res = fgets(buf, sizeof(buf), fd);
 270                 if (res == NULL) {
 271                         fclose(fd);
 272                         return (0);
 273                 }
 274                 if (res[0] == '#')
 275                         continue;
 276                 else if (res[0] == '+') {
 277 #ifdef YP
 278         getnetidyp:
 279                         err = yp_get_default_domain(&domain);
 280                         if (err) {
 281                                 continue;
 282                         }
 283                         lookup = NULL;
 284                         err = yp_match(domain, NETID, key,
 285                                 strlen(key), &lookup, &len);
 286                         if (err) {
 287 #ifdef DEBUG
 288                                 fprintf(stderr, "match failed error %d\n", err);
 289 #endif
 290                                 continue;
 291                         }
 292                         lookup[len] = 0;
 293                         strcpy(ret, lookup);
 294                         free(lookup);
 295                         if (fd != NULL)
 296                                 fclose(fd);
 297                         return (2);
 298 #else   /* YP */
 299 #ifdef DEBUG
 300                         fprintf(stderr,
 301 "Bad record in %s '+' -- NIS not supported in this library copy\n",
 302                                 NETIDFILE);
 303 #endif
 304                         continue;
 305 #endif  /* YP */
 306                 } else {
 307                         mkey = strsep(&res, "\t ");
 308                         if (mkey == NULL) {
 309                                 fprintf(stderr,
 310                 "Bad record in %s -- %s", NETIDFILE, buf);
 311                                 continue;
 312                         }
 313                         do {
 314                                 mval = strsep(&res, " \t#\n");
 315                         } while (mval != NULL && !*mval);
 316                         if (mval == NULL) {
 317                                 fprintf(stderr,
 318                 "Bad record in %s val problem - %s", NETIDFILE, buf);
 319                                 continue;
 320                         }
 321                         if (strcmp(mkey, key) == 0) {
 322                                 strcpy(ret, mval);
 323                                 fclose(fd);
 324                                 return (1);
 325
 326                         }
 327                 }
 328         }
 329 }