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(char netname[MAXNETNAMELEN + 1], uid_t *uidp, gid_t *gidp,
  72     int *gidlenp, gid_t *gidlist)
  73 {
  74         char           *p;
  75         int             gidlen;
  76         uid_t           uid;
  77         long            luid;
  78         struct passwd  *pwd;
  79         char            val[1024];
  80         char           *val1, *val2;
  81         char           *domain;
  82         int             vallen;
  83         int             err;
  84
  85         if (getnetid(netname, val)) {
  86                 char *res = val;
  87
  88                 p = strsep(&res, ":");
  89                 if (p == NULL)
  90                         return (0);
  91                 *uidp = (uid_t) atol(p);
  92                 p = strsep(&res, "\n,");
  93                 if (p == NULL) {
  94                         return (0);
  95                 }
  96                 *gidp = (gid_t) atol(p);
  97                 for (gidlen = 0; gidlen < NGRPS; gidlen++) {
  98                         p = strsep(&res, "\n,");
  99                         if (p == NULL)
 100                                 break;
 101                         gidlist[gidlen] = (gid_t) atol(p);
 102                 }
 103                 *gidlenp = gidlen;
 104
 105                 return (1);
 106         }
 107         val1 = strchr(netname, '.');
 108         if (val1 == NULL)
 109                 return (0);
 110         if (strncmp(netname, OPSYS, (val1-netname)))
 111                 return (0);
 112         val1++;
 113         val2 = strchr(val1, '@');
 114         if (val2 == NULL)
 115                 return (0);
 116         vallen = val2 - val1;
 117         if (vallen > (1024 - 1))
 118                 vallen = 1024 - 1;
 119         (void) strncpy(val, val1, 1024);
 120         val[vallen] = 0;
 121
 122         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 123         if (err)
 124                 return (0);
 125
 126         if (strcmp(val2 + 1, domain))
 127                 return (0);     /* wrong domain */
 128
 129         if (sscanf(val, "%ld", &luid) != 1)
 130                 return (0);
 131         uid = luid;
 132
 133         /* use initgroups method */
 134         pwd = getpwuid(uid);
 135         if (pwd == NULL)
 136                 return (0);
 137         *uidp = pwd->pw_uid;
 138         *gidp = pwd->pw_gid;
 139         *gidlenp = _getgroups(pwd->pw_name, gidlist);
 140         return (1);
 141 }
 142
 143 /*
 144  * initgroups
 145  */
 146
 147 static int
 148 _getgroups(char *uname, gid_t groups[NGRPS])
 149 {
 150         gid_t           ngroups = 0;
 151         struct group *grp;
 152         int    i;
 153         int    j;
 154         int             filter;
 155
 156         setgrent();
 157         while ((grp = getgrent())) {
 158                 for (i = 0; grp->gr_mem[i]; i++)
 159                         if (!strcmp(grp->gr_mem[i], uname)) {
 160                                 if (ngroups == NGRPS) {
 161 #ifdef DEBUG
 162                                         fprintf(stderr,
 163                                 "initgroups: %s is in too many groups\n", uname);
 164 #endif
 165                                         goto toomany;
 166                                 }
 167                                 /* filter out duplicate group entries */
 168                                 filter = 0;
 169                                 for (j = 0; j < ngroups; j++)
 170                                         if (groups[j] == grp->gr_gid) {
 171                                                 filter++;
 172                                                 break;
 173                                         }
 174                                 if (!filter)
 175                                         groups[ngroups++] = grp->gr_gid;
 176                         }
 177         }
 178 toomany:
 179         endgrent();
 180         return (ngroups);
 181 }
 182
 183 /*
 184  * Convert network-name to hostname
 185  */
 186 int
 187 netname2host(char netname[MAXNETNAMELEN + 1], char *hostname, int hostlen)
 188 {
 189         int             err;
 190         char            valbuf[1024];
 191         char           *val;
 192         char           *val2;
 193         int             vallen;
 194         char           *domain;
 195
 196         if (getnetid(netname, valbuf)) {
 197                 val = valbuf;
 198                 if ((*val == '0') && (val[1] == ':')) {
 199                         (void) strncpy(hostname, val + 2, hostlen);
 200                         return (1);
 201                 }
 202         }
 203         val = strchr(netname, '.');
 204         if (val == NULL)
 205                 return (0);
 206         if (strncmp(netname, OPSYS, (val - netname)))
 207                 return (0);
 208         val++;
 209         val2 = strchr(val, '@');
 210         if (val2 == NULL)
 211                 return (0);
 212         vallen = val2 - val;
 213         if (vallen > (hostlen - 1))
 214                 vallen = hostlen - 1;
 215         (void) strncpy(hostname, val, vallen);
 216         hostname[vallen] = 0;
 217
 218         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 219         if (err)
 220                 return (0);
 221
 222         if (strcmp(val2 + 1, domain))
 223                 return (0);     /* wrong domain */
 224         else
 225                 return (1);
 226 }
 227
 228 /*
 229  * reads the file /etc/netid looking for a + to optionally go to the
 230  * network information service.
 231  */
 232 int
 233 getnetid(char *key, char *ret)
 234 {
 235         char            buf[1024];      /* big enough */
 236         char           *res;
 237         char           *mkey;
 238         char           *mval;
 239         FILE           *fd;
 240 #ifdef YP
 241         char           *domain;
 242         int             err;
 243         char           *lookup;
 244         int             len;
 245 #endif
 246         int rv;
 247
 248         rv = 0;
 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         while (fd != NULL) {
 260                 res = fgets(buf, sizeof(buf), fd);
 261                 if (res == NULL) {
 262                         rv = 0;
 263                         goto done;
 264                 }
 265                 if (res[0] == '#')
 266                         continue;
 267                 else if (res[0] == '+') {
 268 #ifdef YP
 269         getnetidyp:
 270                         err = yp_get_default_domain(&domain);
 271                         if (err) {
 272                                 continue;
 273                         }
 274                         lookup = NULL;
 275                         err = yp_match(domain, NETID, key,
 276                                 strlen(key), &lookup, &len);
 277                         if (err) {
 278 #ifdef DEBUG
 279                                 fprintf(stderr, "match failed error %d\n", err);
 280 #endif
 281                                 continue;
 282                         }
 283                         lookup[len] = 0;
 284                         strcpy(ret, lookup);
 285                         free(lookup);
 286                         rv = 2;
 287                         goto done;
 288 #else   /* YP */
 289 #ifdef DEBUG
 290                         fprintf(stderr,
 291 "Bad record in %s '+' -- NIS not supported in this library copy\n",
 292                                 NETIDFILE);
 293 #endif
 294                         continue;
 295 #endif  /* YP */
 296                 } else {
 297                         mkey = strsep(&res, "\t ");
 298                         if (mkey == NULL) {
 299                                 fprintf(stderr,
 300                 "Bad record in %s -- %s", NETIDFILE, buf);
 301                                 continue;
 302                         }
 303                         do {
 304                                 mval = strsep(&res, " \t#\n");
 305                         } while (mval != NULL && !*mval);
 306                         if (mval == NULL) {
 307                                 fprintf(stderr,
 308                 "Bad record in %s val problem - %s", NETIDFILE, buf);
 309                                 continue;
 310                         }
 311                         if (strcmp(mkey, key) == 0) {
 312                                 strcpy(ret, mval);
 313                                 rv = 1;
 314                                 goto done;
 315                         }
 316                 }
 317         }
 318
 319 done:
 320         if (fd != NULL)
 321                 fclose(fd);
 322         return (rv);
 323 }