1 /* 2 * Copyright (c) 2000 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 "krb5_locl.h" 35 #include <fnmatch.h> 36 37 RCSID("$Id: acl.c,v 1.1 2000/06/12 11:17:52 joda Exp $"); 38 39 struct acl_field { 40 enum { acl_string, acl_fnmatch, acl_retval } type; 41 union { 42 const char *cstr; 43 char **retv; 44 } u; 45 struct acl_field *next, **last; 46 }; 47 48 static void 49 acl_free_list(struct acl_field *acl) 50 { 51 struct acl_field *next; 52 while(acl != NULL) { 53 next = acl->next; 54 free(acl); 55 acl = next; 56 } 57 } 58 59 static krb5_error_code 60 acl_parse_format(krb5_context context, 61 struct acl_field **acl_ret, 62 const char *format, 63 va_list ap) 64 { 65 const char *p; 66 struct acl_field *acl = NULL, *tmp; 67 68 for(p = format; *p != '\0'; p++) { 69 tmp = malloc(sizeof(*tmp)); 70 if(tmp == NULL) { 71 acl_free_list(acl); 72 return ENOMEM; 73 } 74 if(*p == 's') { 75 tmp->type = acl_string; 76 tmp->u.cstr = va_arg(ap, const char*); 77 } else if(*p == 'f') { 78 tmp->type = acl_fnmatch; 79 tmp->u.cstr = va_arg(ap, const char*); 80 } else if(*p == 'r') { 81 tmp->type = acl_retval; 82 tmp->u.retv = va_arg(ap, char **); 83 } 84 tmp->next = NULL; 85 if(acl == NULL) 86 acl = tmp; 87 else 88 *acl->last = tmp; 89 acl->last = &tmp->next; 90 } 91 *acl_ret = acl; 92 return 0; 93 } 94 95 static krb5_boolean 96 acl_match_field(krb5_context context, 97 const char *string, 98 struct acl_field *field) 99 { 100 if(field->type == acl_string) { 101 return !strcmp(string, field->u.cstr); 102 } else if(field->type == acl_fnmatch) { 103 return !fnmatch(string, field->u.cstr, 0); 104 } else if(field->type == acl_retval) { 105 *field->u.retv = strdup(string); 106 return TRUE; 107 } 108 return FALSE; 109 } 110 111 static krb5_boolean 112 acl_match_acl(krb5_context context, 113 struct acl_field *acl, 114 const char *string) 115 { 116 char buf[256]; 117 for(;strsep_copy(&string, " \t", buf, sizeof(buf)) != -1; 118 acl = acl->next) { 119 if(buf[0] == '\0') 120 continue; /* skip ws */ 121 if(!acl_match_field(context, buf, acl)) { 122 return FALSE; 123 } 124 } 125 return TRUE; 126 } 127 128 129 krb5_error_code 130 krb5_acl_match_string(krb5_context context, 131 const char *acl_string, 132 const char *format, 133 ...) 134 { 135 krb5_error_code ret; 136 struct acl_field *acl; 137 138 va_list ap; 139 va_start(ap, format); 140 ret = acl_parse_format(context, &acl, format, ap); 141 va_end(ap); 142 if(ret) 143 return ret; 144 145 ret = acl_match_acl(context, acl, acl_string); 146 147 acl_free_list(acl); 148 return ret ? 0 : EACCES; 149 } 150 151 krb5_error_code 152 krb5_acl_match_file(krb5_context context, 153 const char *file, 154 const char *format, 155 ...) 156 { 157 krb5_error_code ret; 158 struct acl_field *acl; 159 char buf[256]; 160 va_list ap; 161 FILE *f; 162 163 f = fopen(file, "r"); 164 if(f == NULL) 165 return errno; 166 167 va_start(ap, format); 168 ret = acl_parse_format(context, &acl, format, ap); 169 va_end(ap); 170 if(ret) { 171 fclose(f); 172 return ret; 173 } 174 175 ret = EACCES; /* XXX */ 176 while(fgets(buf, sizeof(buf), f)) { 177 if(buf[0] == '#') 178 continue; 179 if(acl_match_acl(context, acl, buf)) { 180 ret = 0; 181 goto out; 182 } 183 } 184 185 out: 186 fclose(f); 187 acl_free_list(acl); 188 return ret; 189 } 190