lib/libutil/login_ok.c

   1 /*-
   2  * Copyright (c) 1996 by
   3  * David Nugent <davidn@blaze.net.au>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, is permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice immediately at the beginning of the file, without modification,
  11  *    this list of conditions, and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. This work was done expressly for inclusion into FreeBSD.  Other use
  16  *    is permitted provided this notation is included.
  17  * 4. Absolutely no warranty of function or purpose is made by the authors.
  18  * 5. Modifications may be freely made to this file providing the above
  19  *    conditions are met.
  20  *
  21  * Support allow/deny lists in login class capabilities
  22  *
  23  * $FreeBSD: src/lib/libutil/login_ok.c,v 1.7.2.1 2001/01/10 21:01:30 ghelmer Exp $
  24  * $DragonFly: src/lib/libutil/login_ok.c,v 1.3 2005/03/04 05:31:11 cpressey Exp $
  25  */
  26
  27 #include <sys/types.h>
  28 #include <sys/time.h>
  29 #include <sys/resource.h>
  30 #include <sys/param.h>
  31
  32 #include <errno.h>
  33 #include <fnmatch.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <ttyent.h>
  37 #include <unistd.h>
  38
  39 #include "login_cap.h"
  40
  41 /* -- support functions -- */
  42
  43 /*
  44  * login_strinlist()
  45  * This function is intentionally public - reused by TAS.
  46  * Returns TRUE (non-zero) if a string matches a pattern
  47  * in a given array of patterns. 'flags' is passed directly
  48  * to fnmatch(3).
  49  */
  50
  51 int
  52 login_strinlist(char **list, char const *str, int flags)
  53 {
  54     int rc = 0;
  55
  56     if (str != NULL && *str != '\0') {
  57         int     i = 0;
  58
  59         while (rc == 0 && list[i] != NULL)
  60             rc = fnmatch(list[i++], str, flags) == 0;
  61     }
  62     return rc;
  63 }
  64
  65
  66 /*
  67  * login_str2inlist()
  68  * Locate either or two strings in a given list
  69  */
  70
  71 int
  72 login_str2inlist(char **ttlst, const char *str1, const char *str2, int flags)
  73 {
  74     int     rc = 0;
  75
  76     if (login_strinlist(ttlst, str1, flags))
  77         rc = 1;
  78     else if (login_strinlist(ttlst, str2, flags))
  79         rc = 1;
  80     return rc;
  81 }
  82
  83
  84 /*
  85  * login_timelist()
  86  * This function is intentinoally public - reused by TAS.
  87  * Returns an allocated list of time periods given an array
  88  * of time periods in ascii form.
  89  */
  90
  91 login_time_t *
  92 login_timelist(login_cap_t *lc, char const *cap, int *ltno,
  93                login_time_t **ltptr)
  94 {
  95     int                 j = 0;
  96     struct login_time   *lt = NULL;
  97     char                **tl;
  98
  99     if ((tl = login_getcaplist(lc, cap, NULL)) != NULL) {
 100
 101         while (tl[j++] != NULL)
 102             ;
 103         if (*ltno >= j)
 104             lt = *ltptr;
 105         else if ((lt = realloc(*ltptr, j * sizeof(struct login_time))) != NULL) {
 106             *ltno = j;
 107             *ltptr = lt;
 108         }
 109         if (lt != NULL) {
 110             int     i = 0;
 111
 112             for (--j; i < j; i++)
 113                 lt[i] = parse_lt(tl[i]);
 114             lt[i].lt_dow = LTM_NONE;
 115         }
 116     }
 117     return lt;
 118 }
 119
 120
 121 /*
 122  * login_ttyok()
 123  * This function is a variation of auth_ttyok(), but it checks two
 124  * arbitrary capability lists not necessarily related to access.
 125  * This hook is provided for the accounted/exclude accounting lists.
 126  */
 127
 128 int
 129 login_ttyok(login_cap_t *lc, const char *tty, const char *allowcap,
 130             const char *denycap)
 131 {
 132     int     rc = 1;
 133
 134     if (lc != NULL && tty != NULL && *tty != '\0') {
 135         struct ttyent   *te;
 136         char            *grp;
 137         char            **ttl;
 138
 139         te = getttynam(tty);  /* Need group name */
 140         grp = te ? te->ty_group : NULL;
 141         ttl = login_getcaplist(lc, allowcap, NULL);
 142
 143         if (ttl != NULL && !login_str2inlist(ttl, tty, grp, 0))
 144             rc = 0;     /* tty or ttygroup not in allow list */
 145         else {
 146
 147             ttl = login_getcaplist(lc, denycap, NULL);
 148             if (ttl != NULL && login_str2inlist(ttl, tty, grp, 0))
 149                 rc = 0; /* tty or ttygroup in deny list */
 150         }
 151     }
 152
 153     return rc;
 154 }
 155
 156
 157 /*
 158  * auth_ttyok()
 159  * Determine whether or not login on a tty is accessible for
 160  * a login class
 161  */
 162
 163 int
 164 auth_ttyok(login_cap_t *lc, const char * tty)
 165 {
 166     return login_ttyok(lc, tty, "ttys.allow", "ttys.deny");
 167 }
 168
 169
 170 /*
 171  * login_hostok()
 172  * This function is a variation of auth_hostok(), but it checks two
 173  * arbitrary capability lists not necessarily related to access.
 174  * This hook is provided for the accounted/exclude accounting lists.
 175  */
 176
 177 int
 178 login_hostok(login_cap_t *lc, const char *host, const char *ip,
 179              const char *allowcap, const char *denycap)
 180 {
 181     int     rc = 1; /* Default is ok */
 182
 183     if (lc != NULL &&
 184         ((host != NULL && *host != '\0') || (ip != NULL && *ip != '\0'))) {
 185         char    **hl;
 186
 187         hl = login_getcaplist(lc, allowcap, NULL);
 188         if (hl != NULL && !login_str2inlist(hl, host, ip, FNM_CASEFOLD))
 189             rc = 0;     /* host or IP not in allow list */
 190         else {
 191
 192             hl = login_getcaplist(lc, denycap, NULL);
 193             if (hl != NULL && login_str2inlist(hl, host, ip, FNM_CASEFOLD))
 194                 rc = 0; /* host or IP in deny list */
 195         }
 196     }
 197
 198     return rc;
 199 }
 200
 201
 202 /*
 203  * auth_hostok()
 204  * Determine whether or not login from a host is ok
 205  */
 206
 207 int
 208 auth_hostok(login_cap_t *lc, const char *host, const char *ip)
 209 {
 210     return login_hostok(lc, host, ip, "host.allow", "host.deny");
 211 }
 212
 213
 214 /*
 215  * auth_timeok()
 216  * Determine whether or not login is ok at a given time
 217  */
 218
 219 int
 220 auth_timeok(login_cap_t *lc, time_t t)
 221 {
 222     int     rc = 1; /* Default is ok */
 223
 224     if (lc != NULL && t != (time_t)0 && t != (time_t)-1) {
 225         struct tm       *tptr;
 226
 227         static int      ltimesno = 0;
 228         static struct login_time *ltimes = NULL;
 229
 230         if ((tptr = localtime(&t)) != NULL) {
 231             struct login_time   *lt;
 232
 233           lt = login_timelist(lc, "times.allow", &ltimesno, &ltimes);
 234           if (lt != NULL && in_ltms(lt, tptr, NULL) == -1)
 235               rc = 0;     /* not in allowed times list */
 236           else {
 237
 238               lt = login_timelist(lc, "times.deny", &ltimesno, &ltimes);
 239               if (lt != NULL && in_ltms(lt, tptr, NULL) != -1)
 240                   rc = 0; /* in deny times list */
 241           }
 242           if (ltimes) {
 243               free(ltimes);
 244               ltimes = NULL;
 245               ltimesno = 0;
 246           }
 247         }
 248     }
 249
 250     return rc;
 251 }