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 1.12 2005/03/10 00:58:21 stefanf 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 /*
  37  * netname utility routines convert from unix names to network names and
  38  * vice-versa This module is operating system dependent! What we define here
  39  * will work with any unix system that has adopted the sun NIS domain
  40  * architecture.
  41  */
  42 #include "namespace.h"
  43 #include <sys/param.h>
  44 #include <rpc/rpc.h>
  45 #include <rpc/rpc_com.h>
  46 #ifdef YP
  47 #include <rpcsvc/yp_prot.h>
  48 #include <rpcsvc/ypclnt.h>
  49 #endif
  50 #include <ctype.h>
  51 #include <stdio.h>
  52 #include <grp.h>
  53 #include <pwd.h>
  54 #include <string.h>
  55 #include <stdlib.h>
  56 #include <unistd.h>
  57 #include "un-namespace.h"
  58
  59 static char    *OPSYS = "unix";
  60 #ifdef YP
  61 static char    *NETID = "netid.byname";
  62 #endif
  63 static char    *NETIDFILE = "/etc/netid";
  64
  65 static int      _getgroups(char *, gid_t *);
  66 static int       getnetid(char *, char *);
  67
  68 #ifndef NGROUPS
  69 #define NGROUPS 16
  70 #endif
  71
  72 /*
  73  * Convert network-name into unix credential
  74  */
  75 int
  76 netname2user(char *netname, uid_t *uidp, gid_t *gidp, int *gidlenp,
  77              gid_t *gidlist)
  78 {
  79         char           *p;
  80         int             gidlen;
  81         uid_t           uid;
  82         long            luid;
  83         struct passwd  *pwd;
  84         char            val[1024];
  85         char           *val1, *val2;
  86         char           *domain;
  87         int             vallen;
  88         int             err;
  89
  90         if (getnetid(netname, val)) {
  91                 char *res = val;
  92
  93                 p = strsep(&res, ":");
  94                 if (p == NULL)
  95                         return (0);
  96                 *uidp = (uid_t) atol(p);
  97                 p = strsep(&res, "\n,");
  98                 if (p == NULL) {
  99                         return (0);
 100                 }
 101                 *gidp = (gid_t) atol(p);
 102                 for (gidlen = 0; gidlen < NGROUPS; gidlen++) {
 103                         p = strsep(&res, "\n,");
 104                         if (p == NULL)
 105                                 break;
 106                         gidlist[gidlen] = (gid_t) atol(p);
 107                 }
 108                 *gidlenp = gidlen;
 109
 110                 return (1);
 111         }
 112         val1 = strchr(netname, '.');
 113         if (val1 == NULL)
 114                 return (0);
 115         if (strncmp(netname, OPSYS, (val1-netname)))
 116                 return (0);
 117         val1++;
 118         val2 = strchr(val1, '@');
 119         if (val2 == NULL)
 120                 return (0);
 121         vallen = val2 - val1;
 122         if (vallen > (1024 - 1))
 123                 vallen = 1024 - 1;
 124         strncpy(val, val1, 1024);
 125         val[vallen] = 0;
 126
 127         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 128         if (err)
 129                 return (0);
 130
 131         if (strcmp(val2 + 1, domain))
 132                 return (0);     /* wrong domain */
 133
 134         if (sscanf(val, "%ld", &luid) != 1)
 135                 return (0);
 136         uid = luid;
 137
 138         /* use initgroups method */
 139         pwd = getpwuid(uid);
 140         if (pwd == NULL)
 141                 return (0);
 142         *uidp = pwd->pw_uid;
 143         *gidp = pwd->pw_gid;
 144         *gidlenp = _getgroups(pwd->pw_name, gidlist);
 145         return (1);
 146 }
 147
 148 /*
 149  * initgroups
 150  */
 151
 152 static int
 153 _getgroups(char *uname, gid_t *groups)
 154 {
 155         gid_t           ngroups = 0;
 156         struct group *grp;
 157         int    i;
 158         int    j;
 159         int             filter;
 160
 161         setgrent();
 162         while ((grp = getgrent())) {
 163                 for (i = 0; grp->gr_mem[i]; i++)
 164                         if (!strcmp(grp->gr_mem[i], uname)) {
 165                                 if (ngroups == NGROUPS) {
 166 #ifdef DEBUG
 167                                         fprintf(stderr,
 168                                 "initgroups: %s is in too many groups\n", uname);
 169 #endif
 170                                         goto toomany;
 171                                 }
 172                                 /* filter out duplicate group entries */
 173                                 filter = 0;
 174                                 for (j = 0; j < ngroups; j++)
 175                                         if (groups[j] == grp->gr_gid) {
 176                                                 filter++;
 177                                                 break;
 178                                         }
 179                                 if (!filter)
 180                                         groups[ngroups++] = grp->gr_gid;
 181                         }
 182         }
 183 toomany:
 184         endgrent();
 185         return (ngroups);
 186 }
 187
 188 /*
 189  * Convert network-name to hostname
 190  */
 191 int
 192 netname2host(char *netname, char *hostname, int hostlen)
 193 {
 194         int             err;
 195         char            valbuf[1024];
 196         char           *val;
 197         char           *val2;
 198         int             vallen;
 199         char           *domain;
 200
 201         if (getnetid(netname, valbuf)) {
 202                 val = valbuf;
 203                 if ((*val == '0') && (val[1] == ':')) {
 204                         strncpy(hostname, val + 2, hostlen);
 205                         return (1);
 206                 }
 207         }
 208         val = strchr(netname, '.');
 209         if (val == NULL)
 210                 return (0);
 211         if (strncmp(netname, OPSYS, (val - netname)))
 212                 return (0);
 213         val++;
 214         val2 = strchr(val, '@');
 215         if (val2 == NULL)
 216                 return (0);
 217         vallen = val2 - val;
 218         if (vallen > (hostlen - 1))
 219                 vallen = hostlen - 1;
 220         strncpy(hostname, val, vallen);
 221         hostname[vallen] = 0;
 222
 223         err = __rpc_get_default_domain(&domain);        /* change to rpc */
 224         if (err)
 225                 return (0);
 226
 227         if (strcmp(val2 + 1, domain))
 228                 return (0);     /* wrong domain */
 229         else
 230                 return (1);
 231 }
 232
 233 /*
 234  * reads the file /etc/netid looking for a + to optionally go to the
 235  * network information service.
 236  */
 237 int
 238 getnetid(char *key, char *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 }