[750] | 1 | /* |
---|
| 2 | * nonlocal-shadow.c |
---|
| 3 | * shadow database for nss_nonlocal proxy. |
---|
| 4 | * |
---|
| 5 | * Copyright © 2007 Anders Kaseorg <andersk@mit.edu> |
---|
| 6 | * |
---|
| 7 | * Permission is hereby granted, free of charge, to any person |
---|
| 8 | * obtaining a copy of this software and associated documentation |
---|
| 9 | * files (the "Software"), to deal in the Software without |
---|
| 10 | * restriction, including without limitation the rights to use, copy, |
---|
| 11 | * modify, merge, publish, distribute, sublicense, and/or sell copies |
---|
| 12 | * of the Software, and to permit persons to whom the Software is |
---|
| 13 | * furnished to do so, subject to the following conditions: |
---|
| 14 | * |
---|
| 15 | * The above copyright notice and this permission notice shall be |
---|
| 16 | * included in all copies or substantial portions of the Software. |
---|
| 17 | * |
---|
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
---|
| 19 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
---|
| 20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
---|
| 21 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
---|
| 22 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
---|
| 23 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
---|
| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
---|
| 25 | * SOFTWARE. |
---|
| 26 | */ |
---|
| 27 | |
---|
| 28 | #define _GNU_SOURCE |
---|
| 29 | #include <sys/types.h> |
---|
| 30 | #include <unistd.h> |
---|
| 31 | #include <stdlib.h> |
---|
| 32 | #include <stdint.h> |
---|
| 33 | #include <string.h> |
---|
| 34 | #include <dlfcn.h> |
---|
| 35 | #include <stdio.h> |
---|
| 36 | #include <errno.h> |
---|
| 37 | #include <shadow.h> |
---|
| 38 | #include <nss.h> |
---|
| 39 | |
---|
| 40 | #include "nsswitch-internal.h" |
---|
| 41 | #include "nonlocal.h" |
---|
| 42 | |
---|
| 43 | |
---|
| 44 | static service_user * |
---|
| 45 | nss_shadow_nonlocal_database(void) |
---|
| 46 | { |
---|
| 47 | static service_user *nip = NULL; |
---|
| 48 | if (nip == NULL) |
---|
| 49 | __nss_database_lookup("shadow_nonlocal", NULL, "", &nip); |
---|
| 50 | |
---|
| 51 | return nip; |
---|
| 52 | } |
---|
| 53 | |
---|
| 54 | |
---|
| 55 | static service_user *spent_nip = NULL; |
---|
| 56 | static void *spent_fct_start; |
---|
| 57 | static union { |
---|
| 58 | enum nss_status (*l)(struct spwd *pwd, char *buffer, size_t buflen, |
---|
| 59 | int *errnop); |
---|
| 60 | void *ptr; |
---|
| 61 | } spent_fct; |
---|
| 62 | static const char *spent_fct_name = "getspent_r"; |
---|
| 63 | |
---|
| 64 | enum nss_status |
---|
| 65 | _nss_nonlocal_setspent(int stayopen) |
---|
| 66 | { |
---|
| 67 | static const char *fct_name = "setspent"; |
---|
| 68 | static void *fct_start = NULL; |
---|
| 69 | enum nss_status status; |
---|
| 70 | service_user *nip; |
---|
| 71 | union { |
---|
| 72 | enum nss_status (*l)(int stayopen); |
---|
| 73 | void *ptr; |
---|
| 74 | } fct; |
---|
| 75 | |
---|
| 76 | nip = nss_shadow_nonlocal_database(); |
---|
| 77 | if (nip == NULL) |
---|
| 78 | return NSS_STATUS_UNAVAIL; |
---|
| 79 | if (fct_start == NULL) |
---|
| 80 | fct_start = __nss_lookup_function(nip, fct_name); |
---|
| 81 | fct.ptr = fct_start; |
---|
| 82 | do { |
---|
| 83 | if (fct.ptr == NULL) |
---|
| 84 | status = NSS_STATUS_UNAVAIL; |
---|
| 85 | else |
---|
| 86 | status = DL_CALL_FCT(fct.l, (stayopen)); |
---|
| 87 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); |
---|
| 88 | if (status != NSS_STATUS_SUCCESS) |
---|
| 89 | return status; |
---|
| 90 | |
---|
| 91 | spent_nip = nip; |
---|
| 92 | if (spent_fct_start == NULL) |
---|
| 93 | spent_fct_start = __nss_lookup_function(nip, spent_fct_name); |
---|
| 94 | spent_fct.ptr = spent_fct_start; |
---|
| 95 | return NSS_STATUS_SUCCESS; |
---|
| 96 | } |
---|
| 97 | |
---|
| 98 | enum nss_status |
---|
| 99 | _nss_nonlocal_endspent(void) |
---|
| 100 | { |
---|
| 101 | static const char *fct_name = "endspent"; |
---|
| 102 | static void *fct_start = NULL; |
---|
| 103 | enum nss_status status; |
---|
| 104 | service_user *nip; |
---|
| 105 | union { |
---|
| 106 | enum nss_status (*l)(void); |
---|
| 107 | void *ptr; |
---|
| 108 | } fct; |
---|
| 109 | |
---|
| 110 | spent_nip = NULL; |
---|
| 111 | |
---|
| 112 | nip = nss_shadow_nonlocal_database(); |
---|
| 113 | if (nip == NULL) |
---|
| 114 | return NSS_STATUS_UNAVAIL; |
---|
| 115 | if (fct_start == NULL) |
---|
| 116 | fct_start = __nss_lookup_function(nip, fct_name); |
---|
| 117 | fct.ptr = fct_start; |
---|
| 118 | do { |
---|
| 119 | if (fct.ptr == NULL) |
---|
| 120 | status = NSS_STATUS_UNAVAIL; |
---|
| 121 | else |
---|
| 122 | status = DL_CALL_FCT(fct.l, ()); |
---|
| 123 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); |
---|
| 124 | return status; |
---|
| 125 | } |
---|
| 126 | |
---|
| 127 | enum nss_status |
---|
| 128 | _nss_nonlocal_getspent_r(struct spwd *pwd, char *buffer, size_t buflen, |
---|
| 129 | int *errnop) |
---|
| 130 | { |
---|
| 131 | enum nss_status status; |
---|
| 132 | if (spent_nip == NULL) { |
---|
| 133 | status = _nss_nonlocal_setspent(0); |
---|
| 134 | if (status != NSS_STATUS_SUCCESS) |
---|
| 135 | return status; |
---|
| 136 | } |
---|
| 137 | do { |
---|
| 138 | if (spent_fct.ptr == NULL) |
---|
| 139 | status = NSS_STATUS_UNAVAIL; |
---|
| 140 | else |
---|
| 141 | status = DL_CALL_FCT(spent_fct.l, (pwd, buffer, buflen, errnop)); |
---|
| 142 | if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) |
---|
| 143 | return status; |
---|
| 144 | |
---|
| 145 | if (status == NSS_STATUS_SUCCESS) |
---|
| 146 | return NSS_STATUS_SUCCESS; |
---|
| 147 | } while (__nss_next(&spent_nip, spent_fct_name, &spent_fct.ptr, status, 0) == 0); |
---|
| 148 | |
---|
| 149 | spent_nip = NULL; |
---|
| 150 | return NSS_STATUS_NOTFOUND; |
---|
| 151 | } |
---|
| 152 | |
---|
| 153 | |
---|
| 154 | enum nss_status |
---|
| 155 | _nss_nonlocal_getspnam_r(const char *name, struct spwd *pwd, |
---|
| 156 | char *buffer, size_t buflen, int *errnop) |
---|
| 157 | { |
---|
| 158 | static const char *fct_name = "getspnam_r"; |
---|
| 159 | static void *fct_start = NULL; |
---|
| 160 | enum nss_status status; |
---|
| 161 | service_user *nip; |
---|
| 162 | union { |
---|
| 163 | enum nss_status (*l)(const char *name, struct spwd *pwd, |
---|
| 164 | char *buffer, size_t buflen, int *errnop); |
---|
| 165 | void *ptr; |
---|
| 166 | } fct; |
---|
| 167 | |
---|
| 168 | nip = nss_shadow_nonlocal_database(); |
---|
| 169 | if (nip == NULL) |
---|
| 170 | return NSS_STATUS_UNAVAIL; |
---|
| 171 | if (fct_start == NULL) |
---|
| 172 | fct_start = __nss_lookup_function(nip, fct_name); |
---|
| 173 | fct.ptr = fct_start; |
---|
| 174 | do { |
---|
| 175 | if (fct.ptr == NULL) |
---|
| 176 | status = NSS_STATUS_UNAVAIL; |
---|
| 177 | else |
---|
| 178 | status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop)); |
---|
| 179 | if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) |
---|
| 180 | break; |
---|
| 181 | } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0); |
---|
| 182 | return status; |
---|
| 183 | } |
---|