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/param.h> 29 30 #include <assert.h> 31 #include <grp.h> 32 #include <nsswitch.h> 33 #include <stdlib.h> 34 #include <string.h> 35 36 #include "../debug.h" 37 #include "group.h" 38 39 static int group_marshal_func(struct group *, char *, size_t *); 40 static int group_lookup_func(const char *, size_t, char **, size_t *); 41 static void *group_mp_init_func(void); 42 static int group_mp_lookup_func(char **, size_t *, void *); 43 static void group_mp_destroy_func(void *); 44 45 static int 46 group_marshal_func(struct group *grp, char *buffer, size_t *buffer_size) 47 { 48 struct group new_grp; 49 size_t desired_size, size, mem_size; 50 char *p, **mem; 51 52 TRACE_IN(group_marshal_func); 53 desired_size = ALIGNBYTES + sizeof(struct group) + sizeof(char *); 54 55 if (grp->gr_name != NULL) 56 desired_size += strlen(grp->gr_name) + 1; 57 if (grp->gr_passwd != NULL) 58 desired_size += strlen(grp->gr_passwd) + 1; 59 60 if (grp->gr_mem != NULL) { 61 mem_size = 0; 62 for (mem = grp->gr_mem; *mem; ++mem) { 63 desired_size += strlen(*mem) + 1; 64 ++mem_size; 65 } 66 67 desired_size += ALIGNBYTES + (mem_size + 1) * sizeof(char *); 68 } 69 70 if ((desired_size > *buffer_size) || (buffer == NULL)) { 71 *buffer_size = desired_size; 72 TRACE_OUT(group_marshal_func); 73 return (NS_RETURN); 74 } 75 76 memcpy(&new_grp, grp, sizeof(struct group)); 77 memset(buffer, 0, desired_size); 78 79 *buffer_size = desired_size; 80 p = buffer + sizeof(struct group) + sizeof(char *); 81 memcpy(buffer + sizeof(struct group), &p, sizeof(char *)); 82 p = (char *)ALIGN(p); 83 84 if (new_grp.gr_name != NULL) { 85 size = strlen(new_grp.gr_name); 86 memcpy(p, new_grp.gr_name, size); 87 new_grp.gr_name = p; 88 p += size + 1; 89 } 90 91 if (new_grp.gr_passwd != NULL) { 92 size = strlen(new_grp.gr_passwd); 93 memcpy(p, new_grp.gr_passwd, size); 94 new_grp.gr_passwd = p; 95 p += size + 1; 96 } 97 98 if (new_grp.gr_mem != NULL) { 99 p = (char *)ALIGN(p); 100 memcpy(p, new_grp.gr_mem, sizeof(char *) * mem_size); 101 new_grp.gr_mem = (char **)p; 102 p += sizeof(char *) * (mem_size + 1); 103 104 for (mem = new_grp.gr_mem; *mem; ++mem) { 105 size = strlen(*mem); 106 memcpy(p, *mem, size); 107 *mem = p; 108 p += size + 1; 109 } 110 } 111 112 memcpy(buffer, &new_grp, sizeof(struct group)); 113 TRACE_OUT(group_marshal_func); 114 return (NS_SUCCESS); 115 } 116 117 static int 118 group_lookup_func(const char *key, size_t key_size, char **buffer, 119 size_t *buffer_size) 120 { 121 enum nss_lookup_type lookup_type; 122 char *name; 123 size_t size; 124 gid_t gid; 125 126 struct group *result; 127 128 TRACE_IN(group_lookup_func); 129 assert(buffer != NULL); 130 assert(buffer_size != NULL); 131 132 if (key_size < sizeof(enum nss_lookup_type)) { 133 TRACE_OUT(group_lookup_func); 134 return (NS_UNAVAIL); 135 } 136 memcpy(&lookup_type, key, sizeof(enum nss_lookup_type)); 137 138 switch (lookup_type) { 139 case nss_lt_name: 140 size = key_size - sizeof(enum nss_lookup_type) + 1; 141 name = calloc(1, size); 142 assert(name != NULL); 143 memcpy(name, key + sizeof(enum nss_lookup_type), size - 1); 144 break; 145 case nss_lt_id: 146 if (key_size < sizeof(enum nss_lookup_type) + 147 sizeof(gid_t)) { 148 TRACE_OUT(passwd_lookup_func); 149 return (NS_UNAVAIL); 150 } 151 152 memcpy(&gid, key + sizeof(enum nss_lookup_type), sizeof(gid_t)); 153 break; 154 default: 155 TRACE_OUT(group_lookup_func); 156 return (NS_UNAVAIL); 157 } 158 159 switch (lookup_type) { 160 case nss_lt_name: 161 TRACE_STR(name); 162 result = getgrnam(name); 163 free(name); 164 break; 165 case nss_lt_id: 166 result = getgrgid(gid); 167 break; 168 default: 169 /* SHOULD NOT BE REACHED */ 170 break; 171 } 172 173 if (result != NULL) { 174 group_marshal_func(result, NULL, buffer_size); 175 *buffer = malloc(*buffer_size); 176 assert(*buffer != NULL); 177 group_marshal_func(result, *buffer, buffer_size); 178 } 179 180 TRACE_OUT(group_lookup_func); 181 return (result == NULL ? NS_NOTFOUND : NS_SUCCESS); 182 } 183 184 static void * 185 group_mp_init_func(void) 186 { 187 TRACE_IN(group_mp_init_func); 188 setgrent(); 189 TRACE_OUT(group_mp_init_func); 190 191 return (NULL); 192 } 193 194 static int 195 group_mp_lookup_func(char **buffer, size_t *buffer_size, void *mdata) 196 { 197 struct group *result; 198 199 TRACE_IN(group_mp_lookup_func); 200 result = getgrent(); 201 if (result != NULL) { 202 group_marshal_func(result, NULL, buffer_size); 203 *buffer = malloc(*buffer_size); 204 assert(*buffer != NULL); 205 group_marshal_func(result, *buffer, buffer_size); 206 } 207 208 TRACE_OUT(group_mp_lookup_func); 209 return (result == NULL ? NS_NOTFOUND : NS_SUCCESS); 210 } 211 212 static void 213 group_mp_destroy_func(void *mdata) 214 { 215 TRACE_IN(group_mp_destroy_func); 216 TRACE_OUT(group_mp_destroy_func); 217 } 218 219 struct agent * 220 init_group_agent(void) 221 { 222 struct common_agent *retval; 223 224 TRACE_IN(init_group_agent); 225 retval = calloc(1, sizeof(*retval)); 226 assert(retval != NULL); 227 228 retval->parent.name = strdup("group"); 229 assert(retval->parent.name != NULL); 230 231 retval->parent.type = COMMON_AGENT; 232 retval->lookup_func = group_lookup_func; 233 234 TRACE_OUT(init_group_agent); 235 return ((struct agent *)retval); 236 } 237 238 struct agent * 239 init_group_mp_agent(void) 240 { 241 struct multipart_agent *retval; 242 243 TRACE_IN(init_group_mp_agent); 244 retval = calloc(1, 245 sizeof(*retval)); 246 assert(retval != NULL); 247 248 retval->parent.name = strdup("group"); 249 retval->parent.type = MULTIPART_AGENT; 250 retval->mp_init_func = group_mp_init_func; 251 retval->mp_lookup_func = group_mp_lookup_func; 252 retval->mp_destroy_func = group_mp_destroy_func; 253 assert(retval->parent.name != NULL); 254 255 TRACE_OUT(init_group_mp_agent); 256 return ((struct agent *)retval); 257 } 258