src/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 /*
  30  * netname utility routines convert from unix names to network names and
  31  * vice-versa This module is operating system dependent! What we define here
  32  * will work with any unix system that has adopted the sun NIS domain
  33  * architecture.
  34  */
  35 #include <sys/param.h>
  36 #include <rpc/rpc.h>
  37 #include "rpc_com.h"
  38 #ifdef YP
  39 #include <rpcsvc/yp_prot.h>
  40 #include <rpcsvc/ypclnt.h>
  41 #endif
  42 #include <ctype.h>
  43 #include <stdio.h>
  44 #include <grp.h>
  45 #include <pwd.h>
  46 #include <string.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49
  50 static char    *OPSYS = "unix";
  51 static char    *NETID = "netid.byname";
  52 static char    *NETIDFILE = "/etc/netid";
  53
  54 static int getnetid( char *, char * );
  55 static int _getgroups( char *, gid_t * );
  56
  57 #ifndef NGROUPS
  58 #define NGROUPS 16
  59 #endif
  60
  61 /*
  62  * Convert network-name into unix credential
  63  */
  64 int
  65 netname2user(netname, uidp, gidp, gidlenp, gidlist)
  66         char            netname[MAXNETNAMELEN + 1];
  67         uid_t            *uidp;
  68         gid_t            *gidp;
  69         int            *gidlenp;
  70         gid_t          *gidlist;
  71 {
  72         char           *p;
  73         int             gidlen;
  74         uid_t           uid;
  75         long            luid;
  76         struct passwd  *pwd;
  77         char            val[1024];
  78         char           *val1, *val2;
  79         char           *domain;
  80         int             vallen;
  81         int             err;
  82
  83         if (getnetid(netname, val)) {
  84                 char *res = val;
  85
  86                 p = strsep(&res, ":");
  87                 if (p == NULL)
  88                         return (0);
  89                 *uidp = (uid_t) atol(p);
  90                 p = strsep(&res, "\n,");
  91                 if (p == NULL) {
  92                         return (0);
  93                 }
  94                 *gidp = (gid_t) atol(p);
  95                 gidlen = 0;
  96                 for (gidlen = 0; gidlen < NGROUPS; gidlen++) {
  97                         p = strsep(&res, "\n,");
  98                         if (p == NULL)
  99                                 break;
 100                         gidlist[gidlen] = (gid_t) atol(p);
 101                 }
 102                 *gidlenp = gidlen;
 103
 104                 return (1);
 105         }
 106         val1 = strchr(netname, '.');
 107         if (val1 == NULL)
 108                 return (0);
 109         if (strncmp(netname, OPSYS, (val1-netname)))
 110                 return (0);
 111         val1++;
 112         val2 = strchr(val1, '@');
 113         if (val2 == NULL)
 114                 return (0);
 115         vallen = val2 - val1;
 116         if (vallen > (1024 - 1))
 117                 vallen = 1024 - 1;
 118         (void) strncpy(val, val1, 1024);
 119         val[vallen] = 0;
 120
 121         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 122         if (err)
 123                 return (0);
 124
 125         if (strcmp(val2 + 1, domain))
 126                 return (0);     /* wrong domain */
 127
 128         if (sscanf(val, "%ld", &luid) != 1)
 129                 return (0);
 130         uid = luid;
 131
 132         /* use initgroups method */
 133         pwd = getpwuid(uid);
 134         if (pwd == NULL)
 135                 return (0);
 136         *uidp = pwd->pw_uid;
 137         *gidp = pwd->pw_gid;
 138         *gidlenp = _getgroups(pwd->pw_name, gidlist);
 139         return (1);
 140 }
 141
 142 /*
 143  * initgroups
 144  */
 145
 146 static int
 147 _getgroups(uname, groups)
 148         char           *uname;
 149         gid_t          groups[NGROUPS];
 150 {
 151         gid_t           ngroups = 0;
 152         struct group *grp;
 153         int    i;
 154         int    j;
 155         int             filter;
 156
 157         setgrent();
 158         while ((grp = getgrent())) {
 159                 for (i = 0; grp->gr_mem[i]; i++)
 160                         if (!strcmp(grp->gr_mem[i], uname)) {
 161                                 if (ngroups == NGROUPS) {
 162 #ifdef DEBUG
 163                                         fprintf(stderr,
 164                                 "initgroups: %s is in too many groups\n", uname);
 165 #endif
 166                                         goto toomany;
 167                                 }
 168                                 /* filter out duplicate group entries */
 169                                 filter = 0;
 170                                 for (j = 0; j < ngroups; j++)
 171                                         if (groups[j] == grp->gr_gid) {
 172                                                 filter++;
 173                                                 break;
 174                                         }
 175                                 if (!filter)
 176                                         groups[ngroups++] = grp->gr_gid;
 177                         }
 178         }
 179 toomany:
 180         endgrent();
 181         return (ngroups);
 182 }
 183
 184 /*
 185  * Convert network-name to hostname
 186  */
 187 int
 188 netname2host(netname, hostname, hostlen)
 189         char            netname[MAXNETNAMELEN + 1];
 190         char           *hostname;
 191         int             hostlen;
 192 {
 193         int             err;
 194         char            valbuf[1024];
 195         char           *val;
 196         char           *val2;
 197         int             vallen;
 198         char           *domain;
 199
 200         if (getnetid(netname, valbuf)) {
 201                 val = valbuf;
 202                 if ((*val == '0') && (val[1] == ':')) {
 203                         (void) strncpy(hostname, val + 2, hostlen);
 204                         return (1);
 205                 }
 206         }
 207         val = strchr(netname, '.');
 208         if (val == NULL)
 209                 return (0);
 210         if (strncmp(netname, OPSYS, (val - netname)))
 211                 return (0);
 212         val++;
 213         val2 = strchr(val, '@');
 214         if (val2 == NULL)
 215                 return (0);
 216         vallen = val2 - val;
 217         if (vallen > (hostlen - 1))
 218                 vallen = hostlen - 1;
 219         (void) strncpy(hostname, val, vallen);
 220         hostname[vallen] = 0;
 221
 222         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 223         if (err)
 224                 return (0);
 225
 226         if (strcmp(val2 + 1, domain))
 227                 return (0);     /* wrong domain */
 228         else
 229                 return (1);
 230 }
 231
 232 /*
 233  * reads the file /etc/netid looking for a + to optionally go to the
 234  * network information service.
 235  */
 236 int
 237 getnetid(key, ret)
 238         char           *key, *ret;
 239 {
 240         char            buf[1024];      /* big enough */
 241         char           *res;
 242         char           *mkey;
 243         char           *mval;
 244         FILE           *fd;
 245 #ifdef YP
 246         char           *domain;
 247         int             err;
 248         char           *lookup;
 249         int             len;
 250 #endif
 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         for (;;) {
 262                 if (fd == NULL)
 263                         return (0);     /* getnetidyp brings us here */
 264                 res = fgets(buf, sizeof(buf), fd);
 265                 if (res == NULL) {
 266                         fclose(fd);
 267                         return (0);
 268                 }
 269                 if (res[0] == '#')
 270                         continue;
 271                 else if (res[0] == '+') {
 272 #ifdef YP
 273         getnetidyp:
 274                         err = yp_get_default_domain(&domain);
 275                         if (err) {
 276                                 continue;
 277                         }
 278                         lookup = NULL;
 279                         err = yp_match(domain, NETID, key,
 280                                 strlen(key), &lookup, &len);
 281                         if (err) {
 282 #ifdef DEBUG
 283                                 fprintf(stderr, "match failed error %d\n", err);
 284 #endif
 285                                 continue;
 286                         }
 287                         lookup[len] = 0;
 288                         strcpy(ret, lookup);
 289                         free(lookup);
 290                         if (fd != NULL)
 291                                 fclose(fd);
 292                         return (2);
 293 #else   /* YP */
 294 #ifdef DEBUG
 295                         fprintf(stderr,
 296 "Bad record in %s '+' -- NIS not supported in this library copy\n",
 297                                 NETIDFILE);
 298 #endif
 299                         continue;
 300 #endif  /* YP */
 301                 } else {
 302                         mkey = strsep(&res, "\t ");
 303                         if (mkey == NULL) {
 304                                 fprintf(stderr,
 305                 "Bad record in %s -- %s", NETIDFILE, buf);
 306                                 continue;
 307                         }
 308                         do {
 309                                 mval = strsep(&res, " \t#\n");
 310                         } while (mval != NULL && !*mval);
 311                         if (mval == NULL) {
 312                                 fprintf(stderr,
 313                 "Bad record in %s val problem - %s", NETIDFILE, buf);
 314                                 continue;
 315                         }
 316                         if (strcmp(mkey, key) == 0) {
 317                                 strcpy(ret, mval);
 318                                 fclose(fd);
 319                                 return (1);
 320
 321                         }
 322                 }
 323         }
 324 }