1 /*- 2 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 #include <sys/types.h> 30 31 #include <assert.h> 32 #include <nsswitch.h> 33 #include <pwd.h> 34 #include <stdlib.h> 35 #include <string.h> 36 37 #include "../debug.h" 38 #include "passwd.h" 39 40 static int passwd_marshal_func(struct passwd *, char *, size_t *); 41 static int passwd_lookup_func(const char *, size_t, char **, size_t *); 42 static void *passwd_mp_init_func(void); 43 static int passwd_mp_lookup_func(char **, size_t *, void *); 44 static void passwd_mp_destroy_func(void *mdata); 45 46 static int 47 passwd_marshal_func(struct passwd *pwd, char *buffer, size_t *buffer_size) 48 { 49 char *p; 50 struct passwd new_pwd; 51 size_t desired_size, size; 52 53 TRACE_IN(passwd_marshal_func); 54 desired_size = sizeof(struct passwd) + sizeof(char *) + 55 strlen(pwd->pw_name) + 1; 56 if (pwd->pw_passwd != NULL) 57 desired_size += strlen(pwd->pw_passwd) + 1; 58 if (pwd->pw_class != NULL) 59 desired_size += strlen(pwd->pw_class) + 1; 60 if (pwd->pw_gecos != NULL) 61 desired_size += strlen(pwd->pw_gecos) + 1; 62 if (pwd->pw_dir != NULL) 63 desired_size += strlen(pwd->pw_dir) + 1; 64 if (pwd->pw_shell != NULL) 65 desired_size += strlen(pwd->pw_shell) + 1; 66 67 if ((*buffer_size < desired_size) || (buffer == NULL)) { 68 *buffer_size = desired_size; 69 TRACE_OUT(passwd_marshal_func); 70 return (NS_RETURN); 71 } 72 73 memcpy(&new_pwd, pwd, sizeof(struct passwd)); 74 memset(buffer, 0, desired_size); 75 76 *buffer_size = desired_size; 77 p = buffer + sizeof(struct passwd) + sizeof(char *); 78 memcpy(buffer + sizeof(struct passwd), &p, sizeof(char *)); 79 80 if (new_pwd.pw_name != NULL) { 81 size = strlen(new_pwd.pw_name); 82 memcpy(p, new_pwd.pw_name, size); 83 new_pwd.pw_name = p; 84 p += size + 1; 85 } 86 87 if (new_pwd.pw_passwd != NULL) { 88 size = strlen(new_pwd.pw_passwd); 89 memcpy(p, new_pwd.pw_passwd, size); 90 new_pwd.pw_passwd = p; 91 p += size + 1; 92 } 93 94 if (new_pwd.pw_class != NULL) { 95 size = strlen(new_pwd.pw_class); 96 memcpy(p, new_pwd.pw_class, size); 97 new_pwd.pw_class = p; 98 p += size + 1; 99 } 100 101 if (new_pwd.pw_gecos != NULL) { 102 size = strlen(new_pwd.pw_gecos); 103 memcpy(p, new_pwd.pw_gecos, size); 104 new_pwd.pw_gecos = p; 105 p += size + 1; 106 } 107 108 if (new_pwd.pw_dir != NULL) { 109 size = strlen(new_pwd.pw_dir); 110 memcpy(p, new_pwd.pw_dir, size); 111 new_pwd.pw_dir = p; 112 p += size + 1; 113 } 114 115 if (new_pwd.pw_shell != NULL) { 116 size = strlen(new_pwd.pw_shell); 117 memcpy(p, new_pwd.pw_shell, size); 118 new_pwd.pw_shell = p; 119 p += size + 1; 120 } 121 122 memcpy(buffer, &new_pwd, sizeof(struct passwd)); 123 TRACE_OUT(passwd_marshal_func); 124 return (NS_SUCCESS); 125 } 126 127 static int 128 passwd_lookup_func(const char *key, size_t key_size, char **buffer, 129 size_t *buffer_size) 130 { 131 enum nss_lookup_type lookup_type; 132 char *login; 133 size_t size; 134 uid_t uid; 135 136 struct passwd *result; 137 138 TRACE_IN(passwd_lookup_func); 139 assert(buffer != NULL); 140 assert(buffer_size != NULL); 141 142 if (key_size < sizeof(enum nss_lookup_type)) { 143 TRACE_OUT(passwd_lookup_func); 144 return (NS_UNAVAIL); 145 } 146 memcpy(&lookup_type, key, sizeof(enum nss_lookup_type)); 147 148 switch (lookup_type) { 149 case nss_lt_name: 150 size = key_size - sizeof(enum nss_lookup_type) + 1; 151 login = calloc(1, size); 152 assert(login != NULL); 153 memcpy(login, key + sizeof(enum nss_lookup_type), size - 1); 154 break; 155 case nss_lt_id: 156 if (key_size < sizeof(enum nss_lookup_type) + 157 sizeof(uid_t)) { 158 TRACE_OUT(passwd_lookup_func); 159 return (NS_UNAVAIL); 160 } 161 162 memcpy(&uid, key + sizeof(enum nss_lookup_type), sizeof(uid_t)); 163 break; 164 default: 165 TRACE_OUT(passwd_lookup_func); 166 return (NS_UNAVAIL); 167 } 168 169 switch (lookup_type) { 170 case nss_lt_name: 171 result = getpwnam(login); 172 free(login); 173 break; 174 case nss_lt_id: 175 result = getpwuid(uid); 176 break; 177 default: 178 /* SHOULD NOT BE REACHED */ 179 break; 180 } 181 182 if (result != NULL) { 183 passwd_marshal_func(result, NULL, buffer_size); 184 *buffer = malloc(*buffer_size); 185 assert(*buffer != NULL); 186 passwd_marshal_func(result, *buffer, buffer_size); 187 } 188 189 TRACE_OUT(passwd_lookup_func); 190 return (result == NULL ? NS_NOTFOUND : NS_SUCCESS); 191 } 192 193 static void * 194 passwd_mp_init_func(void) 195 { 196 TRACE_IN(passwd_mp_init_func); 197 setpwent(); 198 TRACE_OUT(passwd_mp_init_func); 199 200 return (NULL); 201 } 202 203 static int 204 passwd_mp_lookup_func(char **buffer, size_t *buffer_size, void *mdata) 205 { 206 struct passwd *result; 207 208 TRACE_IN(passwd_mp_lookup_func); 209 result = getpwent(); 210 if (result != NULL) { 211 passwd_marshal_func(result, NULL, buffer_size); 212 *buffer = malloc(*buffer_size); 213 assert(*buffer != NULL); 214 passwd_marshal_func(result, *buffer, buffer_size); 215 } 216 217 TRACE_OUT(passwd_mp_lookup_func); 218 return (result == NULL ? NS_NOTFOUND : NS_SUCCESS); 219 } 220 221 static void 222 passwd_mp_destroy_func(void *mdata) 223 { 224 TRACE_IN(passwd_mp_destroy_func); 225 TRACE_OUT(passwd_mp_destroy_func); 226 } 227 228 struct agent * 229 init_passwd_agent(void) 230 { 231 struct common_agent *retval; 232 233 TRACE_IN(init_passwd_agent); 234 retval = calloc(1, sizeof(*retval)); 235 assert(retval != NULL); 236 237 retval->parent.name = strdup("passwd"); 238 assert(retval->parent.name != NULL); 239 240 retval->parent.type = COMMON_AGENT; 241 retval->lookup_func = passwd_lookup_func; 242 243 TRACE_OUT(init_passwd_agent); 244 return ((struct agent *)retval); 245 } 246 247 struct agent * 248 init_passwd_mp_agent(void) 249 { 250 struct multipart_agent *retval; 251 252 TRACE_IN(init_passwd_mp_agent); 253 retval = calloc(1, 254 sizeof(*retval)); 255 assert(retval != NULL); 256 257 retval->parent.name = strdup("passwd"); 258 retval->parent.type = MULTIPART_AGENT; 259 retval->mp_init_func = passwd_mp_init_func; 260 retval->mp_lookup_func = passwd_mp_lookup_func; 261 retval->mp_destroy_func = passwd_mp_destroy_func; 262 assert(retval->parent.name != NULL); 263 264 TRACE_OUT(init_passwd_mp_agent); 265 return ((struct agent *)retval); 266 } 267