lib/libc/rpc/netnamer.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user or with the express written consent of
   8  * Sun Microsystems, Inc.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  *
  30  * $FreeBSD: src/lib/libc/rpc/netnamer.c,v 1.3.6.1 2000/09/20 04:43:11 jkh Exp $
  31  * $DragonFly: src/lib/libc/rpc/netnamer.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
  32  *
  33  * @(#)netnamer.c 1.13 91/03/11 Copyr 1986 Sun Micro
  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 <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
  56 static char    *OPSYS = "unix";
  57 static char    *NETID = "netid.byname";
  58 static char    *NETIDFILE = "/etc/netid";
  59
  60 static int getnetid ( char *, char * );
  61 static int _getgroups ( char *, gid_t * );
  62
  63 #ifndef NGROUPS
  64 #define NGROUPS 16
  65 #endif
  66
  67 /*
  68  * Convert network-name into unix credential
  69  */
  70 int
  71 netname2user(char *netname, uid_t *uidp, gid_t *gidp, int *gidlenp,
  72              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                 gidlen = 0;
  98                 for (gidlen = 0; gidlen < NGROUPS; gidlen++) {
  99                         p = strsep(&res, "\n,");
 100                         if (p == NULL)
 101                                 break;
 102                         gidlist[gidlen] = (gid_t) atol(p);
 103                 }
 104                 *gidlenp = gidlen;
 105
 106                 return (1);
 107         }
 108         val1 = strchr(netname, '.');
 109         if (val1 == NULL)
 110                 return (0);
 111         if (strncmp(netname, OPSYS, (val1-netname)))
 112                 return (0);
 113         val1++;
 114         val2 = strchr(val1, '@');
 115         if (val2 == NULL)
 116                 return (0);
 117         vallen = val2 - val1;
 118         if (vallen > (1024 - 1))
 119                 vallen = 1024 - 1;
 120         strncpy(val, val1, 1024);
 121         val[vallen] = 0;
 122
 123         err = _rpc_get_default_domain(&domain); /* change to rpc */
 124         if (err)
 125                 return (0);
 126
 127         if (strcmp(val2 + 1, domain))
 128                 return (0);     /* wrong domain */
 129
 130         if (sscanf(val, "%ld", &luid) != 1)
 131                 return (0);
 132         uid = luid;
 133
 134         /* use initgroups method */
 135         pwd = getpwuid(uid);
 136         if (pwd == NULL)
 137                 return (0);
 138         *uidp = pwd->pw_uid;
 139         *gidp = pwd->pw_gid;
 140         *gidlenp = _getgroups(pwd->pw_name, gidlist);
 141         return (1);
 142 }
 143
 144 /*
 145  * initgroups
 146  */
 147
 148 static int
 149 _getgroups(char *uname, gid_t *groups)
 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(char *netname, char *hostname, int hostlen)
 189 {
 190         int             err;
 191         char            valbuf[1024];
 192         char           *val;
 193         char           *val2;
 194         int             vallen;
 195         char           *domain;
 196
 197         if (getnetid(netname, valbuf)) {
 198                 val = valbuf;
 199                 if ((*val == '0') && (val[1] == ':')) {
 200                         strncpy(hostname, val + 2, hostlen);
 201                         return (1);
 202                 }
 203         }
 204         val = strchr(netname, '.');
 205         if (val == NULL)
 206                 return (0);
 207         if (strncmp(netname, OPSYS, (val - netname)))
 208                 return (0);
 209         val++;
 210         val2 = strchr(val, '@');
 211         if (val2 == NULL)
 212                 return (0);
 213         vallen = val2 - val;
 214         if (vallen > (hostlen - 1))
 215                 vallen = hostlen - 1;
 216         strncpy(hostname, val, vallen);
 217         hostname[vallen] = 0;
 218
 219         err = _rpc_get_default_domain(&domain); /* change to rpc */
 220         if (err)
 221                 return (0);
 222
 223         if (strcmp(val2 + 1, domain))
 224                 return (0);     /* wrong domain */
 225         else
 226                 return (1);
 227 }
 228
 229 /*
 230  * reads the file /etc/netid looking for a + to optionally go to the
 231  * network information service.
 232  */
 233 int
 234 getnetid(char *key, char *ret)
 235 {
 236         char            buf[1024];      /* big enough */
 237         char           *res;
 238         char           *mkey;
 239         char           *mval;
 240         FILE           *fd;
 241 #ifdef YP
 242         char           *domain;
 243         int             err;
 244         char           *lookup;
 245         int             len;
 246 #endif
 247
 248         fd = fopen(NETIDFILE, "r");
 249         if (fd == NULL) {
 250 #ifdef YP
 251                 res = "+";
 252                 goto getnetidyp;
 253 #else
 254                 return (0);
 255 #endif
 256         }
 257         for (;;) {
 258                 if (fd == NULL)
 259                         return (0);     /* getnetidyp brings us here */
 260                 res = fgets(buf, sizeof(buf), fd);
 261                 if (res == NULL) {
 262                         fclose(fd);
 263                         return (0);
 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                         if (fd != NULL)
 287                                 fclose(fd);
 288                         return (2);
 289 #else   /* YP */
 290 #ifdef DEBUG
 291                         fprintf(stderr,
 292 "Bad record in %s '+' -- NIS not supported in this library copy\n",
 293                                 NETIDFILE);
 294 #endif
 295                         continue;
 296 #endif  /* YP */
 297                 } else {
 298                         mkey = strsep(&res, "\t ");
 299                         if (mkey == NULL) {
 300                                 fprintf(stderr,
 301                 "Bad record in %s -- %s", NETIDFILE, buf);
 302                                 continue;
 303                         }
 304                         do {
 305                                 mval = strsep(&res, " \t#\n");
 306                         } while (mval != NULL && !*mval);
 307                         if (mval == NULL) {
 308                                 fprintf(stderr,
 309                 "Bad record in %s val problem - %s", NETIDFILE, buf);
 310                                 continue;
 311                         }
 312                         if (strcmp(mkey, key) == 0) {
 313                                 strcpy(ret, mval);
 314                                 fclose(fd);
 315                                 return (1);
 316
 317                         }
 318                 }
 319         }
 320 }