1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <pwd.h>
27 #include <ctype.h>
28 #include "ldap_common.h"
29
30 /* publickey attributes filters */
31 #define _KEY_CN "cn"
32 #define _KEY_NISPUBLICKEY "nisPublickey"
33 #define _KEY_NISSECRETKEY "nisSecretkey"
34 #define _KEY_UIDNUMBER "uidnumber"
35
36 #define _F_GETKEY_USER "(&(objectClass=nisKeyObject)(uidNumber=%s))"
37 #define _F_GETKEY_USER_SSD "(&(%%s)(uidNumber=%s))"
38 #define _F_GETKEY_HOST "(&(objectClass=nisKeyObject)(cn=%s))"
39 #define _F_GETKEY_HOST_SSD "(&(%%s)(cn=%s))"
40
41 static const char *keys_attrs[] = {
42 _KEY_NISPUBLICKEY,
43 _KEY_NISSECRETKEY,
44 (char *)NULL
45 };
46
47
48 /*
49 * _nss_ldap_key2str is the data marshaling method for the publickey getXbyY
50 * (e.g., getpublickey() and getsecretkey()) backend processes. This method
51 * is called after a successful ldap search has been performed. This method
52 * will parse the ldap search values into "public:secret" file format.
53 *
54 * c3d91f44568fbbefada50d336d9bd67b16e7016f987bb607:
55 * 7675cd9b8753b5db09dabf12da759c2bd1331c927bb322861fffb54be13f55e9
56 *
57 * (All in one line)
58 *
59 * Publickey does not have a front end marshaller so db_type is set
60 * for special handling.
61 */
62
63 static int
_nss_ldap_key2str(ldap_backend_ptr be,nss_XbyY_args_t * argp)64 _nss_ldap_key2str(ldap_backend_ptr be, nss_XbyY_args_t *argp)
65 {
66 int nss_result;
67 char *keytype = (char *)argp->key.pkey.keytype;
68 int keytypelen = strlen(keytype);
69 int len;
70 int buflen = argp->buf.buflen;
71 char *buffer, *pkey, *skey;
72 ns_ldap_result_t *result = be->result;
73 char **pkey_array, **skey_array;
74
75 if (result == NULL || keytype == NULL) {
76 nss_result = NSS_STR_PARSE_ERANGE;
77 goto result_key2str;
78 }
79 nss_result = NSS_STR_PARSE_SUCCESS;
80 (void) memset(argp->buf.buffer, 0, buflen);
81 /* get the publickey */
82 pkey_array = __ns_ldap_getAttr(result->entry, _KEY_NISPUBLICKEY);
83 if (pkey_array == NULL) {
84 nss_result = NSS_STR_PARSE_PARSE;
85 goto result_key2str;
86 }
87 while (*pkey_array) {
88 if (strncasecmp(*pkey_array, keytype, keytypelen) == 0)
89 break;
90 pkey_array++;
91 }
92 if (*pkey_array == NULL) {
93 nss_result = NSS_STR_PARSE_PARSE;
94 goto result_key2str;
95 }
96 pkey = *pkey_array + keytypelen;
97
98 /* get the secretkey */
99 skey_array = __ns_ldap_getAttr(result->entry, _KEY_NISSECRETKEY);
100 if (skey_array == NULL) {
101 /*
102 * if we got this far, it's possible that the secret
103 * key is actually missing or no permission to read it.
104 * For the current implementation, we assume that the
105 * clients have read permission to the secret key. So,
106 * the only possibility of reaching this here is due to
107 * missing secret key.
108 */
109 nss_result = NSS_STR_PARSE_PARSE;
110 goto result_key2str;
111 }
112 while (*skey_array) {
113 if (strncasecmp(*skey_array, keytype, keytypelen) == 0)
114 break;
115 skey_array++;
116 }
117 if (*skey_array == NULL) {
118 nss_result = NSS_STR_PARSE_PARSE;
119 goto result_key2str;
120 }
121 skey = *skey_array + keytypelen;
122
123 /* 2 = 1 ':' + 1 '\0' */
124 len = strlen(pkey) + strlen(skey) + 2;
125 if (len > buflen) {
126 nss_result = NSS_STR_PARSE_ERANGE;
127 goto result_key2str;
128 }
129 /*
130 * publickey does not have a frontend marshaller.
131 * copy the result to buf.buffer directly
132 */
133 buffer = argp->buf.buffer;
134
135 (void) snprintf(buffer, len, "%s:%s", pkey, skey);
136
137 be->db_type = NSS_LDAP_DB_PUBLICKEY;
138
139 result_key2str:
140
141 (void) __ns_ldap_freeResult(&be->result);
142 return ((int)nss_result);
143 }
144
145
146 /*
147 * getkeys gets both the public and secret keys from publickey entry by either
148 * uid name or host name. This function constructs an ldap search filter using
149 * the name invocation parameter and the getpwnam search filter defined. Once
150 * the filter is constructed, we search for a matching entry and marshal the
151 * data results into struct passwd for the frontend process. The function
152 * _nss_ldap_key2ent performs the data marshaling.
153 * The lookups will be done using the proxy credential. We don't want to use
154 * the user's credential for lookup at this point because we don't have any
155 * secure transport.
156 */
157
158 static nss_status_t
getkeys(ldap_backend_ptr be,void * a)159 getkeys(ldap_backend_ptr be, void *a)
160 {
161 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
162 char searchfilter[SEARCHFILTERLEN];
163 char userdata[SEARCHFILTERLEN];
164 char netname[SEARCHFILTERLEN];
165 char *name, *domain, *p;
166 nss_status_t rc;
167 int ret;
168
169 /*
170 * We need to break it down to find if this is a netname for host
171 * or user. We'll pass the domain as is to the LDAP call.
172 */
173 if (_ldap_filter_name(netname, argp->key.pkey.name, sizeof (netname))
174 != 0)
175 return ((nss_status_t)NSS_NOTFOUND);
176
177 domain = strchr(netname, '@');
178 if (!domain)
179 return ((nss_status_t)NSS_NOTFOUND);
180
181 *domain++ = '\0';
182 if ((p = strchr(netname, '.')) == NULL)
183 return ((nss_status_t)NSS_NOTFOUND);
184
185 name = ++p;
186 if (isdigit(*name)) {
187 /* user keys lookup */
188 ret = snprintf(searchfilter, sizeof (searchfilter),
189 _F_GETKEY_USER, name);
190 if (ret >= sizeof (searchfilter) || ret < 0)
191 return ((nss_status_t)NSS_NOTFOUND);
192
193 ret = snprintf(userdata, sizeof (userdata),
194 _F_GETKEY_USER_SSD, name);
195 if (ret >= sizeof (userdata) || ret < 0)
196 return ((nss_status_t)NSS_NOTFOUND);
197
198 rc = (nss_status_t)_nss_ldap_lookup(be, argp,
199 _PASSWD, searchfilter, domain,
200 _merge_SSD_filter, userdata);
201 } else {
202 /* host keys lookup */
203 ret = snprintf(searchfilter, sizeof (searchfilter),
204 _F_GETKEY_HOST, name);
205 if (ret >= sizeof (searchfilter) || ret < 0)
206 return ((nss_status_t)NSS_NOTFOUND);
207
208 ret = snprintf(userdata, sizeof (userdata),
209 _F_GETKEY_HOST_SSD, name);
210 if (ret >= sizeof (userdata) || ret < 0)
211 return ((nss_status_t)NSS_NOTFOUND);
212
213 rc = (nss_status_t)_nss_ldap_lookup(be, argp,
214 _HOSTS, searchfilter, domain,
215 _merge_SSD_filter, userdata);
216 }
217 return (rc);
218 }
219
220
221 static ldap_backend_op_t keys_ops[] = {
222 _nss_ldap_destr,
223 0,
224 0,
225 0,
226 getkeys
227 };
228
229
230 /*
231 * _nss_ldap_publickey_constr is where life begins. This function calls the
232 * generic ldap constructor function to define and build the abstract
233 * data types required to support ldap operations.
234 */
235
236 /*ARGSUSED0*/
237 nss_backend_t *
_nss_ldap_publickey_constr(const char * dummy1,const char * dummy2,const char * dummy3)238 _nss_ldap_publickey_constr(const char *dummy1, const char *dummy2,
239 const char *dummy3)
240 {
241
242 return ((nss_backend_t *)_nss_ldap_constr(keys_ops,
243 sizeof (keys_ops)/sizeof (keys_ops[0]),
244 _PUBLICKEY, keys_attrs, _nss_ldap_key2str));
245 }
246