1 /* 2 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #pragma ident "%Z%%M% %I% %E% SMI" 7 8 /* 9 * lib/krb5/keytab/ktbase.c 10 * 11 * Copyright 1990 by the Massachusetts Institute of Technology. 12 * All Rights Reserved. 13 * 14 * Export of this software from the United States of America may 15 * require a specific license from the United States Government. 16 * It is the responsibility of any person or organization contemplating 17 * export to obtain such a license before exporting. 18 * 19 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 20 * distribute this software and its documentation for any purpose and 21 * without fee is hereby granted, provided that the above copyright 22 * notice appear in all copies and that both that copyright notice and 23 * this permission notice appear in supporting documentation, and that 24 * the name of M.I.T. not be used in advertising or publicity pertaining 25 * to distribution of the software without specific, written prior 26 * permission. Furthermore if you modify this software you must label 27 * your software as modified software and not distribute it in such a 28 * fashion that it might be confused with the original M.I.T. software. 29 * M.I.T. makes no representations about the suitability of 30 * this software for any purpose. It is provided "as is" without express 31 * or implied warranty. 32 * 33 * 34 * Registration functions for keytab. 35 */ 36 37 #include <k5-int.h> 38 #include <k5-thread.h> 39 #include <kt-int.h> 40 41 extern const krb5_kt_ops krb5_ktf_ops; 42 extern const krb5_kt_ops krb5_ktf_writable_ops; 43 extern const krb5_kt_ops krb5_kts_ops; 44 45 struct krb5_kt_typelist { 46 const krb5_kt_ops *ops; 47 const struct krb5_kt_typelist *next; 48 }; 49 static const struct krb5_kt_typelist krb5_kt_typelist_dfl = { &krb5_kt_dfl_ops, 0 }; 50 static const struct krb5_kt_typelist *kt_typehead = &krb5_kt_typelist_dfl; 51 52 static const struct krb5_kt_typelist krb5_kt_typelist_wrfile = { 53 &krb5_ktf_writable_ops, 54 0 55 }; 56 static const struct krb5_kt_typelist krb5_kt_typelist_file = { 57 &krb5_ktf_ops, 58 &krb5_kt_typelist_wrfile 59 }; 60 static const struct krb5_kt_typelist krb5_kt_typelist_srvtab = { 61 &krb5_kts_ops, 62 &krb5_kt_typelist_file 63 }; 64 65 /* SUNW14resync */ 66 /* 67 static const struct krb5_kt_typelist *kt_typehead = &krb5_kt_typelist_srvtab;*/ 68 69 /* Lock for protecting the type list. */ 70 static k5_mutex_t kt_typehead_lock = K5_MUTEX_PARTIAL_INITIALIZER; 71 72 int krb5int_kt_initialize(void) 73 { 74 return k5_mutex_finish_init(&kt_typehead_lock); 75 } 76 77 void 78 krb5int_kt_finalize(void) 79 { 80 struct krb5_kt_typelist *t, *t_next; 81 k5_mutex_destroy(&kt_typehead_lock); 82 for (t = (struct krb5_kt_typelist *)kt_typehead; t != &krb5_kt_typelist_srvtab; 83 t = t_next) { 84 t_next = (struct krb5_kt_typelist *)t->next; 85 free(t); 86 } 87 } 88 89 90 /* 91 * Register a new key table type 92 * don't replace if it already exists; return an error instead. 93 */ 94 /*ARGSUSED*/ 95 krb5_error_code KRB5_CALLCONV 96 krb5_kt_register(krb5_context context, const krb5_kt_ops *ops) 97 { 98 const struct krb5_kt_typelist *t; 99 struct krb5_kt_typelist *newt; 100 krb5_error_code err; 101 102 err = k5_mutex_lock(&kt_typehead_lock); 103 if (err) 104 return err; 105 for (t = kt_typehead; t && strcmp(t->ops->prefix,ops->prefix);t = t->next) 106 ; 107 if (t) { 108 k5_mutex_unlock(&kt_typehead_lock); 109 return KRB5_KT_TYPE_EXISTS; 110 } 111 if (!(newt = (struct krb5_kt_typelist *) malloc(sizeof(*t)))) { 112 k5_mutex_unlock(&kt_typehead_lock); 113 return ENOMEM; 114 } 115 newt->next = kt_typehead; 116 newt->ops = ops; 117 kt_typehead = newt; 118 k5_mutex_unlock(&kt_typehead_lock); 119 return 0; 120 } 121 122 /* 123 * Resolve a key table name into a keytab object. 124 * 125 * The name is currently constrained to be of the form "type:residual"; 126 * 127 * The "type" portion corresponds to one of the registered key table 128 * types, while the "residual" portion is specific to the 129 * particular keytab type. 130 */ 131 132 #include <ctype.h> 133 krb5_error_code KRB5_CALLCONV 134 krb5_kt_resolve (krb5_context context, const char *name, krb5_keytab *ktid) 135 { 136 const struct krb5_kt_typelist *tlist; 137 char *pfx; 138 unsigned int pfxlen; 139 const char *cp, *resid; 140 krb5_error_code err; 141 142 cp = strchr (name, ':'); 143 if (!cp) { 144 return (*krb5_kt_dfl_ops.resolve)(context, name, ktid); 145 } 146 147 pfxlen = cp - name; 148 149 if ( pfxlen == 1 && isalpha(name[0]) ) { 150 /* We found a drive letter not a prefix - use FILE: */ 151 pfx = strdup("FILE:"); 152 if (!pfx) 153 return ENOMEM; 154 155 resid = name; 156 } else { 157 resid = name + pfxlen + 1; 158 159 pfx = malloc (pfxlen+1); 160 if (!pfx) 161 return ENOMEM; 162 163 memcpy (pfx, name, pfxlen); 164 pfx[pfxlen] = '\0'; 165 } 166 167 *ktid = (krb5_keytab) 0; 168 169 err = k5_mutex_lock(&kt_typehead_lock); 170 if (err) 171 return err; 172 tlist = kt_typehead; 173 /* Don't need to hold the lock, since entries are never modified 174 or removed once they're in the list. Just need to protect 175 access to the list head variable itself. */ 176 k5_mutex_unlock(&kt_typehead_lock); 177 for (; tlist; tlist = tlist->next) { 178 if (strcmp (tlist->ops->prefix, pfx) == 0) { 179 free(pfx); 180 return (*tlist->ops->resolve)(context, resid, ktid); 181 } 182 } 183 free(pfx); 184 return KRB5_KT_UNKNOWN_TYPE; 185 } 186 187 188 /* 189 * Routines to deal with externalizingt krb5_keytab. 190 * krb5_keytab_size(); 191 * krb5_keytab_externalize(); 192 * krb5_keytab_internalize(); 193 */ 194 static krb5_error_code krb5_keytab_size 195 (krb5_context, krb5_pointer, size_t *); 196 static krb5_error_code krb5_keytab_externalize 197 (krb5_context, krb5_pointer, krb5_octet **, size_t *); 198 static krb5_error_code krb5_keytab_internalize 199 (krb5_context,krb5_pointer *, krb5_octet **, size_t *); 200 201 /* 202 * Serialization entry for this type. 203 */ 204 static const krb5_ser_entry krb5_keytab_ser_entry = { 205 KV5M_KEYTAB, /* Type */ 206 krb5_keytab_size, /* Sizer routine */ 207 krb5_keytab_externalize, /* Externalize routine */ 208 krb5_keytab_internalize /* Internalize routine */ 209 }; 210 211 static krb5_error_code 212 krb5_keytab_size(krb5_context kcontext, krb5_pointer arg, size_t *sizep) 213 { 214 krb5_error_code kret; 215 krb5_keytab keytab; 216 krb5_ser_handle shandle; 217 218 kret = EINVAL; 219 keytab = (krb5_keytab) arg; 220 shandle = (krb5_ser_handle) keytab->ops->serializer; 221 if ((keytab != NULL) && (keytab->ops) && 222 (shandle != NULL) && (shandle->sizer)) 223 kret = (*shandle->sizer)(kcontext, arg, sizep); 224 return(kret); 225 } 226 227 static krb5_error_code 228 krb5_keytab_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain) 229 { 230 krb5_error_code kret; 231 krb5_keytab keytab; 232 krb5_ser_handle shandle; 233 234 kret = EINVAL; 235 keytab = (krb5_keytab) arg; 236 shandle = (krb5_ser_handle) keytab->ops->serializer; 237 if ((keytab != NULL) && (keytab->ops) && 238 (shandle != NULL) && (shandle->externalizer)) 239 kret = (*shandle->externalizer)(kcontext, arg, buffer, lenremain); 240 return(kret); 241 } 242 243 static krb5_error_code 244 krb5_keytab_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain) 245 { 246 krb5_error_code kret; 247 krb5_ser_handle shandle; 248 249 kret = EINVAL; 250 shandle = (krb5_ser_handle) krb5_kt_dfl_ops.serializer; 251 if ((shandle != NULL) && (shandle->internalizer)) 252 kret = (*shandle->internalizer)(kcontext, argp, buffer, lenremain); 253 return(kret); 254 } 255 256 krb5_error_code KRB5_CALLCONV 257 krb5_ser_keytab_init(krb5_context kcontext) 258 { 259 return(krb5_register_serializer(kcontext, &krb5_keytab_ser_entry)); 260 } 261