1 /* 2 * Copyright 2006 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_wrfile = { 50 &krb5_ktf_writable_ops, 51 0 52 }; 53 static const struct krb5_kt_typelist krb5_kt_typelist_file = { 54 &krb5_ktf_ops, 55 &krb5_kt_typelist_wrfile 56 }; 57 static const struct krb5_kt_typelist krb5_kt_typelist_srvtab = { 58 &krb5_kts_ops, 59 &krb5_kt_typelist_file 60 }; 61 static const struct krb5_kt_typelist *kt_typehead = &krb5_kt_typelist_srvtab; 62 /* Lock for protecting the type list. */ 63 static k5_mutex_t kt_typehead_lock = K5_MUTEX_PARTIAL_INITIALIZER; 64 65 int krb5int_kt_initialize(void) 66 { 67 return k5_mutex_finish_init(&kt_typehead_lock); 68 } 69 70 void 71 krb5int_kt_finalize(void) 72 { 73 struct krb5_kt_typelist *t, *t_next; 74 k5_mutex_destroy(&kt_typehead_lock); 75 for (t = (struct krb5_kt_typelist *)kt_typehead; t != &krb5_kt_typelist_srvtab; 76 t = t_next) { 77 t_next = (struct krb5_kt_typelist *)t->next; 78 free(t); 79 } 80 } 81 82 83 /* 84 * Register a new key table type 85 * don't replace if it already exists; return an error instead. 86 */ 87 /*ARGSUSED*/ 88 krb5_error_code KRB5_CALLCONV 89 krb5_kt_register(krb5_context context, const krb5_kt_ops *ops) 90 { 91 const struct krb5_kt_typelist *t; 92 struct krb5_kt_typelist *newt; 93 krb5_error_code err; 94 95 err = k5_mutex_lock(&kt_typehead_lock); 96 if (err) 97 return err; 98 for (t = kt_typehead; t && strcmp(t->ops->prefix,ops->prefix);t = t->next) 99 ; 100 if (t) { 101 k5_mutex_unlock(&kt_typehead_lock); 102 return KRB5_KT_TYPE_EXISTS; 103 } 104 if (!(newt = (struct krb5_kt_typelist *) malloc(sizeof(*t)))) { 105 k5_mutex_unlock(&kt_typehead_lock); 106 return ENOMEM; 107 } 108 newt->next = kt_typehead; 109 newt->ops = ops; 110 kt_typehead = newt; 111 k5_mutex_unlock(&kt_typehead_lock); 112 return 0; 113 } 114 115 /* 116 * Resolve a key table name into a keytab object. 117 * 118 * The name is currently constrained to be of the form "type:residual"; 119 * 120 * The "type" portion corresponds to one of the registered key table 121 * types, while the "residual" portion is specific to the 122 * particular keytab type. 123 */ 124 125 #include <ctype.h> 126 krb5_error_code KRB5_CALLCONV 127 krb5_kt_resolve (krb5_context context, const char *name, krb5_keytab *ktid) 128 { 129 const struct krb5_kt_typelist *tlist; 130 char *pfx; 131 unsigned int pfxlen; 132 const char *cp, *resid; 133 krb5_error_code err; 134 135 cp = strchr (name, ':'); 136 if (!cp) { 137 return (*krb5_kt_dfl_ops.resolve)(context, name, ktid); 138 } 139 140 pfxlen = cp - name; 141 142 if ( pfxlen == 1 && isalpha(name[0]) ) { 143 /* We found a drive letter not a prefix - use FILE: */ 144 pfx = strdup("FILE:"); 145 if (!pfx) 146 return ENOMEM; 147 148 resid = name; 149 } else { 150 resid = name + pfxlen + 1; 151 152 pfx = malloc (pfxlen+1); 153 if (!pfx) 154 return ENOMEM; 155 156 memcpy (pfx, name, pfxlen); 157 pfx[pfxlen] = '\0'; 158 } 159 160 *ktid = (krb5_keytab) 0; 161 162 err = k5_mutex_lock(&kt_typehead_lock); 163 if (err) 164 return err; 165 tlist = kt_typehead; 166 /* Don't need to hold the lock, since entries are never modified 167 or removed once they're in the list. Just need to protect 168 access to the list head variable itself. */ 169 k5_mutex_unlock(&kt_typehead_lock); 170 for (; tlist; tlist = tlist->next) { 171 if (strcmp (tlist->ops->prefix, pfx) == 0) { 172 free(pfx); 173 return (*tlist->ops->resolve)(context, resid, ktid); 174 } 175 } 176 free(pfx); 177 return KRB5_KT_UNKNOWN_TYPE; 178 } 179 180 181 /* 182 * Routines to deal with externalizingt krb5_keytab. 183 * krb5_keytab_size(); 184 * krb5_keytab_externalize(); 185 * krb5_keytab_internalize(); 186 */ 187 static krb5_error_code krb5_keytab_size 188 (krb5_context, krb5_pointer, size_t *); 189 static krb5_error_code krb5_keytab_externalize 190 (krb5_context, krb5_pointer, krb5_octet **, size_t *); 191 static krb5_error_code krb5_keytab_internalize 192 (krb5_context,krb5_pointer *, krb5_octet **, size_t *); 193 194 /* 195 * Serialization entry for this type. 196 */ 197 static const krb5_ser_entry krb5_keytab_ser_entry = { 198 KV5M_KEYTAB, /* Type */ 199 krb5_keytab_size, /* Sizer routine */ 200 krb5_keytab_externalize, /* Externalize routine */ 201 krb5_keytab_internalize /* Internalize routine */ 202 }; 203 204 static krb5_error_code 205 krb5_keytab_size(krb5_context kcontext, krb5_pointer arg, size_t *sizep) 206 { 207 krb5_error_code kret; 208 krb5_keytab keytab; 209 krb5_ser_handle shandle; 210 211 kret = EINVAL; 212 keytab = (krb5_keytab) arg; 213 shandle = (krb5_ser_handle) keytab->ops->serializer; 214 if ((keytab != NULL) && (keytab->ops) && 215 (shandle != NULL) && (shandle->sizer)) 216 kret = (*shandle->sizer)(kcontext, arg, sizep); 217 return(kret); 218 } 219 220 static krb5_error_code 221 krb5_keytab_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain) 222 { 223 krb5_error_code kret; 224 krb5_keytab keytab; 225 krb5_ser_handle shandle; 226 227 kret = EINVAL; 228 keytab = (krb5_keytab) arg; 229 shandle = (krb5_ser_handle) keytab->ops->serializer; 230 if ((keytab != NULL) && (keytab->ops) && 231 (shandle != NULL) && (shandle->externalizer)) 232 kret = (*shandle->externalizer)(kcontext, arg, buffer, lenremain); 233 return(kret); 234 } 235 236 static krb5_error_code 237 krb5_keytab_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain) 238 { 239 krb5_error_code kret; 240 krb5_ser_handle shandle; 241 242 kret = EINVAL; 243 shandle = (krb5_ser_handle) krb5_kt_dfl_ops.serializer; 244 if ((shandle != NULL) && (shandle->internalizer)) 245 kret = (*shandle->internalizer)(kcontext, argp, buffer, lenremain); 246 return(kret); 247 } 248 249 krb5_error_code KRB5_CALLCONV 250 krb5_ser_keytab_init(krb5_context kcontext) 251 { 252 return(krb5_register_serializer(kcontext, &krb5_keytab_ser_entry)); 253 } 254