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 (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
24 */
25
26 /*
27 * Authentication helpers for building credentials
28 */
29
30 #include <sys/types.h>
31 #include <sys/sid.h>
32 #include <sys/priv_names.h>
33 #include <sys/socket.h>
34 #include <sys/un.h>
35 #include <netinet/in.h>
36 #include <smbsrv/smb_idmap.h>
37 #include <smbsrv/smb_kproto.h>
38 #include <smbsrv/smb_token.h>
39
40 static void smb_cred_set_sid(smb_id_t *id, ksid_t *ksid);
41 static ksidlist_t *smb_cred_set_sidlist(smb_ids_t *token_grps);
42
43 /*
44 * Allocate a Solaris cred and initialize it based on the access token.
45 *
46 * If the user can be mapped to a non-ephemeral ID, the cred gid is set
47 * to the Solaris user's primary group.
48 *
49 * If the mapped UID is ephemeral, or the primary group could not be
50 * obtained, the cred gid is set to whatever Solaris group is mapped
51 * to the token's primary group.
52 */
53 cred_t *
54 smb_cred_create(smb_token_t *token)
55 {
56 ksid_t ksid;
57 ksidlist_t *ksidlist = NULL;
58 smb_posix_grps_t *posix_grps;
59 cred_t *cr;
60 gid_t gid;
61
62 ASSERT(token);
63 ASSERT(token->tkn_posix_grps);
64 posix_grps = token->tkn_posix_grps;
65
66 cr = crget();
67 ASSERT(cr != NULL);
68
69 if (!IDMAP_ID_IS_EPHEMERAL(token->tkn_user.i_id) &&
70 (posix_grps->pg_ngrps != 0)) {
71 gid = posix_grps->pg_grps[0];
72 } else {
73 gid = token->tkn_primary_grp.i_id;
74 }
75
76 if (crsetugid(cr, token->tkn_user.i_id, gid) != 0) {
77 crfree(cr);
78 return (NULL);
79 }
80
81 if (crsetgroups(cr, posix_grps->pg_ngrps, posix_grps->pg_grps) != 0) {
82 crfree(cr);
83 return (NULL);
84 }
85
86 smb_cred_set_sid(&token->tkn_user, &ksid);
87 crsetsid(cr, &ksid, KSID_USER);
88 smb_cred_set_sid(&token->tkn_primary_grp, &ksid);
89 crsetsid(cr, &ksid, KSID_GROUP);
90 smb_cred_set_sid(&token->tkn_owner, &ksid);
91 crsetsid(cr, &ksid, KSID_OWNER);
92 ksidlist = smb_cred_set_sidlist(&token->tkn_win_grps);
93 crsetsidlist(cr, ksidlist);
94
95 /*
96 * In the AD world, "take ownership privilege" is very much
97 * like having Unix "root" privileges. It's normally given
98 * to members of the "Administrators" group, which normally
99 * includes the the local Administrator (like root) and when
100 * joined to a domain, "Domain Admins".
101 */
102 if (smb_token_query_privilege(token, SE_TAKE_OWNERSHIP_LUID)) {
103 (void) crsetpriv(cr,
104 PRIV_FILE_CHOWN,
105 PRIV_FILE_DAC_READ,
106 PRIV_FILE_DAC_SEARCH,
107 PRIV_FILE_DAC_WRITE,
108 PRIV_FILE_OWNER,
109 NULL);
110 }
111
112 return (cr);
113 }
114
115 /*
116 * Initialize the ksid based on the given smb_id_t.
117 */
118 static void
119 smb_cred_set_sid(smb_id_t *id, ksid_t *ksid)
120 {
121 char sidstr[SMB_SID_STRSZ];
122 int rc;
123
124 ASSERT(id);
125 ASSERT(id->i_sid);
126
127 ksid->ks_id = id->i_id;
128 smb_sid_tostr(id->i_sid, sidstr);
129 rc = smb_sid_splitstr(sidstr, &ksid->ks_rid);
130 ASSERT(rc == 0);
131
132 ksid->ks_attr = id->i_attrs;
133 ksid->ks_domain = ksid_lookupdomain(sidstr);
134 }
135
136 /*
137 * Allocate and initialize the ksidlist based on the access token group list.
138 */
139 static ksidlist_t *
140 smb_cred_set_sidlist(smb_ids_t *token_grps)
141 {
142 int i;
143 ksidlist_t *lp;
144
145 lp = kmem_zalloc(KSIDLIST_MEM(token_grps->i_cnt), KM_SLEEP);
146 lp->ksl_ref = 1;
147 lp->ksl_nsid = token_grps->i_cnt;
148 lp->ksl_neid = 0;
149
150 for (i = 0; i < lp->ksl_nsid; i++) {
151 smb_cred_set_sid(&token_grps->i_ids[i], &lp->ksl_sids[i]);
152 if (lp->ksl_sids[i].ks_id > IDMAP_WK__MAX_GID)
153 lp->ksl_neid++;
154 }
155
156 return (lp);
157 }