1 /*
2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6
7 /*
8 * lib/krb5/keytab/ktbase.c
9 *
10 * Copyright 1990 by the Massachusetts Institute of Technology.
11 * All Rights Reserved.
12 *
13 * Export of this software from the United States of America may
14 * require a specific license from the United States Government.
15 * It is the responsibility of any person or organization contemplating
16 * export to obtain such a license before exporting.
17 *
18 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
19 * distribute this software and its documentation for any purpose and
20 * without fee is hereby granted, provided that the above copyright
21 * notice appear in all copies and that both that copyright notice and
22 * this permission notice appear in supporting documentation, and that
23 * the name of M.I.T. not be used in advertising or publicity pertaining
24 * to distribution of the software without specific, written prior
25 * permission. Furthermore if you modify this software you must label
26 * your software as modified software and not distribute it in such a
27 * fashion that it might be confused with the original M.I.T. software.
28 * M.I.T. makes no representations about the suitability of
29 * this software for any purpose. It is provided "as is" without express
30 * or implied warranty.
31 *
32 *
33 * Registration functions for keytab.
34 */
35
36 #include "k5-int.h"
37 #include "k5-thread.h"
38 #include "kt-int.h"
39
40 extern const krb5_kt_ops krb5_ktf_ops;
41 extern const krb5_kt_ops krb5_ktf_writable_ops;
42 extern const krb5_kt_ops krb5_kts_ops;
43
44 struct krb5_kt_typelist {
45 const krb5_kt_ops *ops;
46 const struct krb5_kt_typelist *next;
47 };
48 /* Solaris Kerberos */
49 static const struct krb5_kt_typelist krb5_kt_typelist_wrfile = {
50 &krb5_ktf_writable_ops,
51 0
52 };
53 /* Solaris Kerberos */
54 static const struct krb5_kt_typelist krb5_kt_typelist_file = {
55 &krb5_ktf_ops,
56 &krb5_kt_typelist_wrfile
57 };
58 /* Solaris Kerberos */
59 static const struct krb5_kt_typelist krb5_kt_typelist_srvtab = {
60 &krb5_kts_ops,
61 &krb5_kt_typelist_file
62 };
63 static const struct krb5_kt_typelist *kt_typehead = &krb5_kt_typelist_srvtab;
64 /* Lock for protecting the type list. */
65 static k5_mutex_t kt_typehead_lock = K5_MUTEX_PARTIAL_INITIALIZER;
66
krb5int_kt_initialize(void)67 int krb5int_kt_initialize(void)
68 {
69 return k5_mutex_finish_init(&kt_typehead_lock);
70 }
71
72 void
krb5int_kt_finalize(void)73 krb5int_kt_finalize(void)
74 {
75 struct krb5_kt_typelist *t, *t_next;
76 k5_mutex_destroy(&kt_typehead_lock);
77 /* Solaris Kerberos */
78 for (t = (struct krb5_kt_typelist *)kt_typehead; t != &krb5_kt_typelist_srvtab;
79 t = t_next) {
80 t_next = (struct krb5_kt_typelist *)t->next;
81 free(t);
82 }
83 }
84
85
86 /*
87 * Register a new key table type
88 * don't replace if it already exists; return an error instead.
89 */
90 /*ARGSUSED*/
91 krb5_error_code KRB5_CALLCONV
krb5_kt_register(krb5_context context,const krb5_kt_ops * ops)92 krb5_kt_register(krb5_context context, const krb5_kt_ops *ops)
93 {
94 const struct krb5_kt_typelist *t;
95 struct krb5_kt_typelist *newt;
96 krb5_error_code err;
97
98 err = k5_mutex_lock(&kt_typehead_lock);
99 if (err)
100 return err;
101 for (t = kt_typehead; t && strcmp(t->ops->prefix,ops->prefix);t = t->next)
102 ;
103 if (t) {
104 k5_mutex_unlock(&kt_typehead_lock);
105 return KRB5_KT_TYPE_EXISTS;
106 }
107 if (!(newt = (struct krb5_kt_typelist *) malloc(sizeof(*t)))) {
108 k5_mutex_unlock(&kt_typehead_lock);
109 return ENOMEM;
110 }
111 newt->next = kt_typehead;
112 newt->ops = ops;
113 kt_typehead = newt;
114 k5_mutex_unlock(&kt_typehead_lock);
115 return 0;
116 }
117
118 /*
119 * Resolve a key table name into a keytab object.
120 *
121 * The name is currently constrained to be of the form "type:residual";
122 *
123 * The "type" portion corresponds to one of the registered key table
124 * types, while the "residual" portion is specific to the
125 * particular keytab type.
126 */
127
128 #include <ctype.h>
129 krb5_error_code KRB5_CALLCONV
krb5_kt_resolve(krb5_context context,const char * name,krb5_keytab * ktid)130 krb5_kt_resolve (krb5_context context, const char *name, krb5_keytab *ktid)
131 {
132 const struct krb5_kt_typelist *tlist;
133 char *pfx;
134 unsigned int pfxlen;
135 const char *cp, *resid;
136 krb5_error_code err;
137
138 cp = strchr (name, ':');
139 if (!cp) {
140 return (*krb5_kt_dfl_ops.resolve)(context, name, ktid);
141 }
142
143 pfxlen = cp - name;
144
145 if ( pfxlen == 1 && isalpha((unsigned char) name[0]) ) {
146 /* We found a drive letter not a prefix - use FILE */
147 pfx = strdup("FILE");
148 if (!pfx)
149 return ENOMEM;
150
151 resid = name;
152 } else {
153 resid = name + pfxlen + 1;
154
155 pfx = malloc (pfxlen+1);
156 if (!pfx)
157 return ENOMEM;
158
159 memcpy (pfx, name, pfxlen);
160 pfx[pfxlen] = '\0';
161 }
162
163 *ktid = (krb5_keytab) 0;
164
165 err = k5_mutex_lock(&kt_typehead_lock);
166 if (err)
167 return err;
168 tlist = kt_typehead;
169 /* Don't need to hold the lock, since entries are never modified
170 or removed once they're in the list. Just need to protect
171 access to the list head variable itself. */
172 k5_mutex_unlock(&kt_typehead_lock);
173 for (; tlist; tlist = tlist->next) {
174 if (strcmp (tlist->ops->prefix, pfx) == 0) {
175 free(pfx);
176 return (*tlist->ops->resolve)(context, resid, ktid);
177 }
178 }
179 free(pfx);
180 return KRB5_KT_UNKNOWN_TYPE;
181 }
182
183 /*
184 * Routines to deal with externalizingt krb5_keytab.
185 * krb5_keytab_size();
186 * krb5_keytab_externalize();
187 * krb5_keytab_internalize();
188 */
189 static krb5_error_code krb5_keytab_size
190 (krb5_context, krb5_pointer, size_t *);
191 static krb5_error_code krb5_keytab_externalize
192 (krb5_context, krb5_pointer, krb5_octet **, size_t *);
193 static krb5_error_code krb5_keytab_internalize
194 (krb5_context,krb5_pointer *, krb5_octet **, size_t *);
195
196 /*
197 * Serialization entry for this type.
198 */
199 static const krb5_ser_entry krb5_keytab_ser_entry = {
200 KV5M_KEYTAB, /* Type */
201 krb5_keytab_size, /* Sizer routine */
202 krb5_keytab_externalize, /* Externalize routine */
203 krb5_keytab_internalize /* Internalize routine */
204 };
205
206 static krb5_error_code
krb5_keytab_size(krb5_context kcontext,krb5_pointer arg,size_t * sizep)207 krb5_keytab_size(krb5_context kcontext, krb5_pointer arg, size_t *sizep)
208 {
209 krb5_error_code kret;
210 krb5_keytab keytab;
211 krb5_ser_handle shandle;
212
213 kret = EINVAL;
214 /* Solaris Kerberos */
215 keytab = (krb5_keytab) arg;
216 shandle = (krb5_ser_handle) keytab->ops->serializer;
217 if ((keytab != NULL) && (keytab->ops) &&
218 (shandle != NULL) && (shandle->sizer))
219 kret = (*shandle->sizer)(kcontext, arg, sizep);
220 return(kret);
221 }
222
223 static krb5_error_code
krb5_keytab_externalize(krb5_context kcontext,krb5_pointer arg,krb5_octet ** buffer,size_t * lenremain)224 krb5_keytab_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain)
225 {
226 krb5_error_code kret;
227 krb5_keytab keytab;
228 krb5_ser_handle shandle;
229
230 kret = EINVAL;
231 /* Solaris Kerberos */
232 keytab = (krb5_keytab) arg;
233 shandle = (krb5_ser_handle) keytab->ops->serializer;
234 if ((keytab != NULL) && (keytab->ops) &&
235 (shandle != NULL) && (shandle->externalizer))
236 kret = (*shandle->externalizer)(kcontext, arg, buffer, lenremain);
237 return(kret);
238 }
239
240 static krb5_error_code
krb5_keytab_internalize(krb5_context kcontext,krb5_pointer * argp,krb5_octet ** buffer,size_t * lenremain)241 krb5_keytab_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain)
242 {
243 krb5_error_code kret;
244 krb5_ser_handle shandle;
245
246 kret = EINVAL;
247 /* Solaris Kerberos */
248 shandle = (krb5_ser_handle) krb5_kt_dfl_ops.serializer;
249 if ((shandle != NULL) && (shandle->internalizer))
250 kret = (*shandle->internalizer)(kcontext, argp, buffer, lenremain);
251 return(kret);
252 }
253
254 krb5_error_code KRB5_CALLCONV
krb5_ser_keytab_init(krb5_context kcontext)255 krb5_ser_keytab_init(krb5_context kcontext)
256 {
257 return(krb5_register_serializer(kcontext, &krb5_keytab_ser_entry));
258 }
259