1 /* 2 * Copyright (c) 1997, 1999 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "kadm5_locl.h" 35 36 RCSID("$Id: acl.c,v 1.10 1999/12/02 17:05:05 joda Exp $"); 37 38 static struct units acl_units[] = { 39 { "all", KADM5_PRIV_ALL }, 40 { "change-password",KADM5_PRIV_CPW }, 41 { "cpw", KADM5_PRIV_CPW }, 42 { "list", KADM5_PRIV_LIST }, 43 { "delete", KADM5_PRIV_DELETE }, 44 { "modify", KADM5_PRIV_MODIFY }, 45 { "add", KADM5_PRIV_ADD }, 46 { "get", KADM5_PRIV_GET }, 47 { NULL } 48 }; 49 50 kadm5_ret_t 51 _kadm5_string_to_privs(const char *s, u_int32_t* privs) 52 { 53 int flags; 54 flags = parse_flags(s, acl_units, 0); 55 if(flags < 0) 56 return KADM5_FAILURE; 57 *privs = flags; 58 return 0; 59 } 60 61 kadm5_ret_t 62 _kadm5_privs_to_string(u_int32_t privs, char *string, size_t len) 63 { 64 if(privs == 0) 65 strlcpy(string, "none", len); 66 else 67 unparse_flags(privs, acl_units + 1, string, len); 68 return 0; 69 } 70 71 kadm5_ret_t 72 _kadm5_acl_init(kadm5_server_context *context) 73 { 74 FILE *f; 75 char buf[128]; 76 krb5_principal princ; 77 int flags; 78 krb5_error_code ret; 79 80 krb5_parse_name(context->context, KADM5_ADMIN_SERVICE, &princ); 81 ret = krb5_principal_compare(context->context, context->caller, princ); 82 krb5_free_principal(context->context, princ); 83 if(ret != 0){ 84 context->acl_flags = KADM5_PRIV_ALL; 85 return 0; 86 } 87 88 flags = -1; 89 f = fopen(context->config.acl_file, "r"); 90 if(f){ 91 while(fgets(buf, sizeof(buf), f)){ 92 char *foo = NULL, *p; 93 p = strtok_r(buf, " \t\n", &foo); 94 if(p == NULL) 95 continue; 96 ret = krb5_parse_name(context->context, p, &princ); 97 if(ret) 98 continue; 99 if(!krb5_principal_compare(context->context, 100 context->caller, princ)){ 101 krb5_free_principal(context->context, princ); 102 continue; 103 } 104 krb5_free_principal(context->context, princ); 105 p = strtok_r(NULL, "\n", &foo); 106 if(p == NULL) 107 continue; 108 ret = _kadm5_string_to_privs(p, &flags); 109 break; 110 } 111 fclose(f); 112 } 113 if(flags == -1) 114 flags = 0; 115 context->acl_flags = flags; 116 return 0; 117 } 118 119 kadm5_ret_t 120 _kadm5_acl_check_permission(kadm5_server_context *context, unsigned op) 121 { 122 unsigned res = ~context->acl_flags & op; 123 if(res & KADM5_PRIV_GET) 124 return KADM5_AUTH_GET; 125 if(res & KADM5_PRIV_ADD) 126 return KADM5_AUTH_ADD; 127 if(res & KADM5_PRIV_MODIFY) 128 return KADM5_AUTH_MODIFY; 129 if(res & KADM5_PRIV_DELETE) 130 return KADM5_AUTH_DELETE; 131 if(res & KADM5_PRIV_CPW) 132 return KADM5_AUTH_CHANGEPW; 133 if(res & KADM5_PRIV_LIST) 134 return KADM5_AUTH_LIST; 135 if(res) 136 return KADM5_AUTH_INSUFFICIENT; 137 return 0; 138 } 139