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f6903667 AK |
1 | /* |
2 | * nonlocal-shadow.c | |
3 | * shadow database for nss_nonlocal proxy. | |
4 | * | |
96a1ee0f | 5 | * Copyright © 2007–2010 Anders Kaseorg <andersk@mit.edu> |
f6903667 | 6 | * |
96a1ee0f | 7 | * This file is part of nss_nonlocal. |
f6903667 | 8 | * |
96a1ee0f AK |
9 | * nss_nonlocal is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU Lesser General Public License | |
11 | * as published by the Free Software Foundation; either version 2.1 of | |
12 | * the License, or (at your option) any later version. | |
f6903667 | 13 | * |
96a1ee0f AK |
14 | * nss_nonlocal is distributed in the hope that it will be useful, but |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with nss_nonlocal; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
22 | * 02110-1301 USA | |
f6903667 AK |
23 | */ |
24 | ||
25 | #define _GNU_SOURCE | |
26 | #include <sys/types.h> | |
27 | #include <unistd.h> | |
28 | #include <stdlib.h> | |
29 | #include <stdint.h> | |
30 | #include <string.h> | |
31 | #include <dlfcn.h> | |
32 | #include <stdio.h> | |
22562df0 | 33 | #include <syslog.h> |
f6903667 AK |
34 | #include <errno.h> |
35 | #include <shadow.h> | |
36 | #include <nss.h> | |
37 | ||
38 | #include "nsswitch-internal.h" | |
39 | #include "nonlocal.h" | |
40 | ||
41 | ||
42 | static service_user * | |
43 | nss_shadow_nonlocal_database(void) | |
44 | { | |
45 | static service_user *nip = NULL; | |
46 | if (nip == NULL) | |
47 | __nss_database_lookup("shadow_nonlocal", NULL, "", &nip); | |
48 | ||
49 | return nip; | |
50 | } | |
51 | ||
52 | ||
53 | static service_user *spent_nip = NULL; | |
54 | static void *spent_fct_start; | |
55 | static union { | |
56 | enum nss_status (*l)(struct spwd *pwd, char *buffer, size_t buflen, | |
57 | int *errnop); | |
58 | void *ptr; | |
59 | } spent_fct; | |
60 | static const char *spent_fct_name = "getspent_r"; | |
61 | ||
62 | enum nss_status | |
63 | _nss_nonlocal_setspent(int stayopen) | |
64 | { | |
65 | static const char *fct_name = "setspent"; | |
66 | static void *fct_start = NULL; | |
67 | enum nss_status status; | |
68 | service_user *nip; | |
69 | union { | |
70 | enum nss_status (*l)(int stayopen); | |
71 | void *ptr; | |
72 | } fct; | |
73 | ||
74 | nip = nss_shadow_nonlocal_database(); | |
75 | if (nip == NULL) | |
76 | return NSS_STATUS_UNAVAIL; | |
77 | if (fct_start == NULL) | |
78 | fct_start = __nss_lookup_function(nip, fct_name); | |
79 | fct.ptr = fct_start; | |
80 | do { | |
81 | if (fct.ptr == NULL) | |
82 | status = NSS_STATUS_UNAVAIL; | |
83 | else | |
84 | status = DL_CALL_FCT(fct.l, (stayopen)); | |
85 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); | |
86 | if (status != NSS_STATUS_SUCCESS) | |
87 | return status; | |
88 | ||
89 | spent_nip = nip; | |
90 | if (spent_fct_start == NULL) | |
91 | spent_fct_start = __nss_lookup_function(nip, spent_fct_name); | |
92 | spent_fct.ptr = spent_fct_start; | |
93 | return NSS_STATUS_SUCCESS; | |
94 | } | |
95 | ||
96 | enum nss_status | |
97 | _nss_nonlocal_endspent(void) | |
98 | { | |
99 | static const char *fct_name = "endspent"; | |
100 | static void *fct_start = NULL; | |
101 | enum nss_status status; | |
102 | service_user *nip; | |
103 | union { | |
104 | enum nss_status (*l)(void); | |
105 | void *ptr; | |
106 | } fct; | |
107 | ||
108 | spent_nip = NULL; | |
109 | ||
110 | nip = nss_shadow_nonlocal_database(); | |
111 | if (nip == NULL) | |
112 | return NSS_STATUS_UNAVAIL; | |
113 | if (fct_start == NULL) | |
114 | fct_start = __nss_lookup_function(nip, fct_name); | |
115 | fct.ptr = fct_start; | |
116 | do { | |
117 | if (fct.ptr == NULL) | |
118 | status = NSS_STATUS_UNAVAIL; | |
119 | else | |
120 | status = DL_CALL_FCT(fct.l, ()); | |
121 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); | |
122 | return status; | |
123 | } | |
124 | ||
125 | enum nss_status | |
126 | _nss_nonlocal_getspent_r(struct spwd *pwd, char *buffer, size_t buflen, | |
127 | int *errnop) | |
128 | { | |
129 | enum nss_status status; | |
130 | if (spent_nip == NULL) { | |
131 | status = _nss_nonlocal_setspent(0); | |
132 | if (status != NSS_STATUS_SUCCESS) | |
133 | return status; | |
134 | } | |
135 | do { | |
136 | if (spent_fct.ptr == NULL) | |
137 | status = NSS_STATUS_UNAVAIL; | |
138 | else | |
139 | status = DL_CALL_FCT(spent_fct.l, (pwd, buffer, buflen, errnop)); | |
140 | if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) | |
141 | return status; | |
142 | ||
143 | if (status == NSS_STATUS_SUCCESS) | |
144 | return NSS_STATUS_SUCCESS; | |
145 | } while (__nss_next(&spent_nip, spent_fct_name, &spent_fct.ptr, status, 0) == 0); | |
146 | ||
147 | spent_nip = NULL; | |
148 | return NSS_STATUS_NOTFOUND; | |
149 | } | |
150 | ||
151 | ||
152 | enum nss_status | |
153 | _nss_nonlocal_getspnam_r(const char *name, struct spwd *pwd, | |
154 | char *buffer, size_t buflen, int *errnop) | |
155 | { | |
156 | static const char *fct_name = "getspnam_r"; | |
157 | static void *fct_start = NULL; | |
158 | enum nss_status status; | |
159 | service_user *nip; | |
160 | union { | |
161 | enum nss_status (*l)(const char *name, struct spwd *pwd, | |
162 | char *buffer, size_t buflen, int *errnop); | |
163 | void *ptr; | |
164 | } fct; | |
165 | ||
166 | nip = nss_shadow_nonlocal_database(); | |
167 | if (nip == NULL) | |
168 | return NSS_STATUS_UNAVAIL; | |
169 | if (fct_start == NULL) | |
170 | fct_start = __nss_lookup_function(nip, fct_name); | |
171 | fct.ptr = fct_start; | |
172 | do { | |
173 | if (fct.ptr == NULL) | |
174 | status = NSS_STATUS_UNAVAIL; | |
175 | else | |
176 | status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop)); | |
177 | if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) | |
178 | break; | |
179 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); | |
22562df0 AK |
180 | if (status != NSS_STATUS_SUCCESS) |
181 | return status; | |
182 | ||
183 | if (strcmp(name, pwd->sp_namp) != 0) { | |
184 | syslog(LOG_ERR, "nss_nonlocal: discarding shadow %s from lookup for shadow %s\n", pwd->sp_namp, name); | |
185 | return NSS_STATUS_NOTFOUND; | |
186 | } | |
187 | ||
188 | return NSS_STATUS_SUCCESS; | |
f6903667 | 189 | } |