Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Authors: Karl MacMillan <kmacmillan@tresys.com> |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 2 | * Frank Mayer <mayerf@tresys.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
| 5 | * This program is free software; you can redistribute it and/or modify |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 6 | * it under the terms of the GNU General Public License as published by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * the Free Software Foundation, version 2. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/string.h> |
| 13 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/slab.h> |
| 15 | |
| 16 | #include "security.h" |
| 17 | #include "conditional.h" |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 18 | #include "services.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | /* |
| 21 | * cond_evaluate_expr evaluates a conditional expr |
| 22 | * in reverse polish notation. It returns true (1), false (0), |
| 23 | * or undefined (-1). Undefined occurs when the expression |
| 24 | * exceeds the stack depth of COND_EXPR_MAXDEPTH. |
| 25 | */ |
| 26 | static int cond_evaluate_expr(struct policydb *p, struct cond_expr *expr) |
| 27 | { |
| 28 | |
| 29 | struct cond_expr *cur; |
| 30 | int s[COND_EXPR_MAXDEPTH]; |
| 31 | int sp = -1; |
| 32 | |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 33 | for (cur = expr; cur; cur = cur->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | switch (cur->expr_type) { |
| 35 | case COND_BOOL: |
| 36 | if (sp == (COND_EXPR_MAXDEPTH - 1)) |
| 37 | return -1; |
| 38 | sp++; |
| 39 | s[sp] = p->bool_val_to_struct[cur->bool - 1]->state; |
| 40 | break; |
| 41 | case COND_NOT: |
| 42 | if (sp < 0) |
| 43 | return -1; |
| 44 | s[sp] = !s[sp]; |
| 45 | break; |
| 46 | case COND_OR: |
| 47 | if (sp < 1) |
| 48 | return -1; |
| 49 | sp--; |
| 50 | s[sp] |= s[sp + 1]; |
| 51 | break; |
| 52 | case COND_AND: |
| 53 | if (sp < 1) |
| 54 | return -1; |
| 55 | sp--; |
| 56 | s[sp] &= s[sp + 1]; |
| 57 | break; |
| 58 | case COND_XOR: |
| 59 | if (sp < 1) |
| 60 | return -1; |
| 61 | sp--; |
| 62 | s[sp] ^= s[sp + 1]; |
| 63 | break; |
| 64 | case COND_EQ: |
| 65 | if (sp < 1) |
| 66 | return -1; |
| 67 | sp--; |
| 68 | s[sp] = (s[sp] == s[sp + 1]); |
| 69 | break; |
| 70 | case COND_NEQ: |
| 71 | if (sp < 1) |
| 72 | return -1; |
| 73 | sp--; |
| 74 | s[sp] = (s[sp] != s[sp + 1]); |
| 75 | break; |
| 76 | default: |
| 77 | return -1; |
| 78 | } |
| 79 | } |
| 80 | return s[0]; |
| 81 | } |
| 82 | |
| 83 | /* |
| 84 | * evaluate_cond_node evaluates the conditional stored in |
| 85 | * a struct cond_node and if the result is different than the |
| 86 | * current state of the node it sets the rules in the true/false |
| 87 | * list appropriately. If the result of the expression is undefined |
| 88 | * all of the rules are disabled for safety. |
| 89 | */ |
| 90 | int evaluate_cond_node(struct policydb *p, struct cond_node *node) |
| 91 | { |
| 92 | int new_state; |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 93 | struct cond_av_list *cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | new_state = cond_evaluate_expr(p, node->expr); |
| 96 | if (new_state != node->cur_state) { |
| 97 | node->cur_state = new_state; |
| 98 | if (new_state == -1) |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 99 | printk(KERN_ERR "SELinux: expression result was undefined - disabling all rules.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | /* turn the rules on or off */ |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 101 | for (cur = node->true_list; cur; cur = cur->next) { |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 102 | if (new_state <= 0) |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 103 | cur->node->key.specified &= ~AVTAB_ENABLED; |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 104 | else |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 105 | cur->node->key.specified |= AVTAB_ENABLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 108 | for (cur = node->false_list; cur; cur = cur->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | /* -1 or 1 */ |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 110 | if (new_state) |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 111 | cur->node->key.specified &= ~AVTAB_ENABLED; |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 112 | else |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 113 | cur->node->key.specified |= AVTAB_ENABLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | } |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | int cond_policydb_init(struct policydb *p) |
| 120 | { |
Dan Carpenter | 38184c5 | 2010-06-12 20:55:01 +0200 | [diff] [blame] | 121 | int rc; |
| 122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | p->bool_val_to_struct = NULL; |
| 124 | p->cond_list = NULL; |
Dan Carpenter | 38184c5 | 2010-06-12 20:55:01 +0200 | [diff] [blame] | 125 | |
| 126 | rc = avtab_init(&p->te_cond_avtab); |
| 127 | if (rc) |
| 128 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | static void cond_av_list_destroy(struct cond_av_list *list) |
| 134 | { |
| 135 | struct cond_av_list *cur, *next; |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 136 | for (cur = list; cur; cur = next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | next = cur->next; |
| 138 | /* the avtab_ptr_t node is destroy by the avtab */ |
| 139 | kfree(cur); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | static void cond_node_destroy(struct cond_node *node) |
| 144 | { |
| 145 | struct cond_expr *cur_expr, *next_expr; |
| 146 | |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 147 | for (cur_expr = node->expr; cur_expr; cur_expr = next_expr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | next_expr = cur_expr->next; |
| 149 | kfree(cur_expr); |
| 150 | } |
| 151 | cond_av_list_destroy(node->true_list); |
| 152 | cond_av_list_destroy(node->false_list); |
| 153 | kfree(node); |
| 154 | } |
| 155 | |
| 156 | static void cond_list_destroy(struct cond_node *list) |
| 157 | { |
| 158 | struct cond_node *next, *cur; |
| 159 | |
| 160 | if (list == NULL) |
| 161 | return; |
| 162 | |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 163 | for (cur = list; cur; cur = next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | next = cur->next; |
| 165 | cond_node_destroy(cur); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | void cond_policydb_destroy(struct policydb *p) |
| 170 | { |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 171 | kfree(p->bool_val_to_struct); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | avtab_destroy(&p->te_cond_avtab); |
| 173 | cond_list_destroy(p->cond_list); |
| 174 | } |
| 175 | |
| 176 | int cond_init_bool_indexes(struct policydb *p) |
| 177 | { |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 178 | kfree(p->bool_val_to_struct); |
Thomas Meyer | 2ff6fa8 | 2011-11-17 23:43:40 +0100 | [diff] [blame] | 179 | p->bool_val_to_struct = |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 180 | kmalloc(p->p_bools.nprim * sizeof(struct cond_bool_datum *), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | if (!p->bool_val_to_struct) |
Davidlohr Bueso | 3ac285ff | 2011-01-21 12:28:04 -0300 | [diff] [blame] | 182 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | int cond_destroy_bool(void *key, void *datum, void *p) |
| 187 | { |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 188 | kfree(key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | kfree(datum); |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | int cond_index_bool(void *key, void *datum, void *datap) |
| 194 | { |
| 195 | struct policydb *p; |
| 196 | struct cond_bool_datum *booldatum; |
Eric Paris | ac76c05 | 2010-11-29 15:47:09 -0500 | [diff] [blame] | 197 | struct flex_array *fa; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
| 199 | booldatum = datum; |
| 200 | p = datap; |
| 201 | |
| 202 | if (!booldatum->value || booldatum->value > p->p_bools.nprim) |
| 203 | return -EINVAL; |
| 204 | |
Eric Paris | ac76c05 | 2010-11-29 15:47:09 -0500 | [diff] [blame] | 205 | fa = p->sym_val_to_name[SYM_BOOLS]; |
| 206 | if (flex_array_put_ptr(fa, booldatum->value - 1, key, |
| 207 | GFP_KERNEL | __GFP_ZERO)) |
| 208 | BUG(); |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 209 | p->bool_val_to_struct[booldatum->value - 1] = booldatum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static int bool_isvalid(struct cond_bool_datum *b) |
| 215 | { |
| 216 | if (!(b->state == 0 || b->state == 1)) |
| 217 | return 0; |
| 218 | return 1; |
| 219 | } |
| 220 | |
| 221 | int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp) |
| 222 | { |
| 223 | char *key = NULL; |
| 224 | struct cond_bool_datum *booldatum; |
Alexey Dobriyan | b5bf6c5 | 2005-09-03 15:55:17 -0700 | [diff] [blame] | 225 | __le32 buf[3]; |
| 226 | u32 len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | int rc; |
| 228 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 229 | booldatum = kzalloc(sizeof(struct cond_bool_datum), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | if (!booldatum) |
Dan Carpenter | 338437f | 2010-06-12 20:56:01 +0200 | [diff] [blame] | 231 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
| 233 | rc = next_entry(buf, fp, sizeof buf); |
Dan Carpenter | 338437f | 2010-06-12 20:56:01 +0200 | [diff] [blame] | 234 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | goto err; |
| 236 | |
| 237 | booldatum->value = le32_to_cpu(buf[0]); |
| 238 | booldatum->state = le32_to_cpu(buf[1]); |
| 239 | |
Dan Carpenter | 338437f | 2010-06-12 20:56:01 +0200 | [diff] [blame] | 240 | rc = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (!bool_isvalid(booldatum)) |
| 242 | goto err; |
| 243 | |
| 244 | len = le32_to_cpu(buf[2]); |
| 245 | |
Dan Carpenter | 338437f | 2010-06-12 20:56:01 +0200 | [diff] [blame] | 246 | rc = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | key = kmalloc(len + 1, GFP_KERNEL); |
| 248 | if (!key) |
| 249 | goto err; |
| 250 | rc = next_entry(key, fp, len); |
Dan Carpenter | 338437f | 2010-06-12 20:56:01 +0200 | [diff] [blame] | 251 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | goto err; |
Vesa-Matti J Kari | df4ea86 | 2008-07-20 23:57:01 +0300 | [diff] [blame] | 253 | key[len] = '\0'; |
Dan Carpenter | 338437f | 2010-06-12 20:56:01 +0200 | [diff] [blame] | 254 | rc = hashtab_insert(h, key, booldatum); |
| 255 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | goto err; |
| 257 | |
| 258 | return 0; |
| 259 | err: |
| 260 | cond_destroy_bool(key, booldatum, NULL); |
Dan Carpenter | 338437f | 2010-06-12 20:56:01 +0200 | [diff] [blame] | 261 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 264 | struct cond_insertf_data { |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 265 | struct policydb *p; |
| 266 | struct cond_av_list *other; |
| 267 | struct cond_av_list *head; |
| 268 | struct cond_av_list *tail; |
| 269 | }; |
| 270 | |
| 271 | static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum *d, void *ptr) |
| 272 | { |
| 273 | struct cond_insertf_data *data = ptr; |
| 274 | struct policydb *p = data->p; |
| 275 | struct cond_av_list *other = data->other, *list, *cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | struct avtab_node *node_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | u8 found; |
Dan Carpenter | 9d623b1 | 2010-06-12 20:52:19 +0200 | [diff] [blame] | 278 | int rc = -EINVAL; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 279 | |
| 280 | /* |
| 281 | * For type rules we have to make certain there aren't any |
| 282 | * conflicting rules by searching the te_avtab and the |
| 283 | * cond_te_avtab. |
| 284 | */ |
| 285 | if (k->specified & AVTAB_TYPE) { |
| 286 | if (avtab_search(&p->te_avtab, k)) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 287 | printk(KERN_ERR "SELinux: type rule already exists outside of a conditional.\n"); |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 288 | goto err; |
| 289 | } |
| 290 | /* |
| 291 | * If we are reading the false list other will be a pointer to |
| 292 | * the true list. We can have duplicate entries if there is only |
| 293 | * 1 other entry and it is in our true list. |
| 294 | * |
| 295 | * If we are reading the true list (other == NULL) there shouldn't |
| 296 | * be any other entries. |
| 297 | */ |
| 298 | if (other) { |
| 299 | node_ptr = avtab_search_node(&p->te_cond_avtab, k); |
| 300 | if (node_ptr) { |
| 301 | if (avtab_search_node_next(node_ptr, k->specified)) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 302 | printk(KERN_ERR "SELinux: too many conflicting type rules.\n"); |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 303 | goto err; |
| 304 | } |
| 305 | found = 0; |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 306 | for (cur = other; cur; cur = cur->next) { |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 307 | if (cur->node == node_ptr) { |
| 308 | found = 1; |
| 309 | break; |
| 310 | } |
| 311 | } |
| 312 | if (!found) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 313 | printk(KERN_ERR "SELinux: conflicting type rules.\n"); |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 314 | goto err; |
| 315 | } |
| 316 | } |
| 317 | } else { |
| 318 | if (avtab_search(&p->te_cond_avtab, k)) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 319 | printk(KERN_ERR "SELinux: conflicting type rules when adding type rule for true.\n"); |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 320 | goto err; |
| 321 | } |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | node_ptr = avtab_insert_nonunique(&p->te_cond_avtab, k, d); |
| 326 | if (!node_ptr) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 327 | printk(KERN_ERR "SELinux: could not insert rule.\n"); |
Dan Carpenter | 9d623b1 | 2010-06-12 20:52:19 +0200 | [diff] [blame] | 328 | rc = -ENOMEM; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 329 | goto err; |
| 330 | } |
| 331 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 332 | list = kzalloc(sizeof(struct cond_av_list), GFP_KERNEL); |
Dan Carpenter | 9d623b1 | 2010-06-12 20:52:19 +0200 | [diff] [blame] | 333 | if (!list) { |
| 334 | rc = -ENOMEM; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 335 | goto err; |
Dan Carpenter | 9d623b1 | 2010-06-12 20:52:19 +0200 | [diff] [blame] | 336 | } |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 337 | |
| 338 | list->node = node_ptr; |
| 339 | if (!data->head) |
| 340 | data->head = list; |
| 341 | else |
| 342 | data->tail->next = list; |
| 343 | data->tail = list; |
| 344 | return 0; |
| 345 | |
| 346 | err: |
| 347 | cond_av_list_destroy(data->head); |
| 348 | data->head = NULL; |
Dan Carpenter | 9d623b1 | 2010-06-12 20:52:19 +0200 | [diff] [blame] | 349 | return rc; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | static int cond_read_av_list(struct policydb *p, void *fp, struct cond_av_list **ret_list, struct cond_av_list *other) |
| 353 | { |
| 354 | int i, rc; |
Alexey Dobriyan | b5bf6c5 | 2005-09-03 15:55:17 -0700 | [diff] [blame] | 355 | __le32 buf[1]; |
| 356 | u32 len; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 357 | struct cond_insertf_data data; |
| 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | *ret_list = NULL; |
| 360 | |
| 361 | len = 0; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 362 | rc = next_entry(buf, fp, sizeof(u32)); |
Dan Carpenter | 9d623b1 | 2010-06-12 20:52:19 +0200 | [diff] [blame] | 363 | if (rc) |
| 364 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | len = le32_to_cpu(buf[0]); |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 367 | if (len == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 370 | data.p = p; |
| 371 | data.other = other; |
| 372 | data.head = NULL; |
| 373 | data.tail = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | for (i = 0; i < len; i++) { |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 375 | rc = avtab_read_item(&p->te_cond_avtab, fp, p, cond_insertf, |
| 376 | &data); |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 377 | if (rc) |
| 378 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | } |
| 380 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 381 | *ret_list = data.head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | static int expr_isvalid(struct policydb *p, struct cond_expr *expr) |
| 386 | { |
| 387 | if (expr->expr_type <= 0 || expr->expr_type > COND_LAST) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 388 | printk(KERN_ERR "SELinux: conditional expressions uses unknown operator.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | if (expr->bool > p->p_bools.nprim) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 393 | printk(KERN_ERR "SELinux: conditional expressions uses unknown bool.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | return 0; |
| 395 | } |
| 396 | return 1; |
| 397 | } |
| 398 | |
| 399 | static int cond_read_node(struct policydb *p, struct cond_node *node, void *fp) |
| 400 | { |
Alexey Dobriyan | b5bf6c5 | 2005-09-03 15:55:17 -0700 | [diff] [blame] | 401 | __le32 buf[2]; |
| 402 | u32 len, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | int rc; |
| 404 | struct cond_expr *expr = NULL, *last = NULL; |
| 405 | |
Namhyung Kim | f004afe | 2014-06-15 01:19:01 +0900 | [diff] [blame] | 406 | rc = next_entry(buf, fp, sizeof(u32) * 2); |
Dan Carpenter | fc5c126 | 2010-06-12 20:53:46 +0200 | [diff] [blame] | 407 | if (rc) |
Namhyung Kim | 6e51f9c | 2014-06-15 01:19:02 +0900 | [diff] [blame] | 408 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
| 410 | node->cur_state = le32_to_cpu(buf[0]); |
| 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | /* expr */ |
Namhyung Kim | f004afe | 2014-06-15 01:19:01 +0900 | [diff] [blame] | 413 | len = le32_to_cpu(buf[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 415 | for (i = 0; i < len; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | rc = next_entry(buf, fp, sizeof(u32) * 2); |
Dan Carpenter | fc5c126 | 2010-06-12 20:53:46 +0200 | [diff] [blame] | 417 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | goto err; |
| 419 | |
Dan Carpenter | fc5c126 | 2010-06-12 20:53:46 +0200 | [diff] [blame] | 420 | rc = -ENOMEM; |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 421 | expr = kzalloc(sizeof(struct cond_expr), GFP_KERNEL); |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 422 | if (!expr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
| 425 | expr->expr_type = le32_to_cpu(buf[0]); |
| 426 | expr->bool = le32_to_cpu(buf[1]); |
| 427 | |
| 428 | if (!expr_isvalid(p, expr)) { |
Dan Carpenter | fc5c126 | 2010-06-12 20:53:46 +0200 | [diff] [blame] | 429 | rc = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | kfree(expr); |
| 431 | goto err; |
| 432 | } |
| 433 | |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 434 | if (i == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | node->expr = expr; |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 436 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | last->next = expr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | last = expr; |
| 439 | } |
| 440 | |
Dan Carpenter | fc5c126 | 2010-06-12 20:53:46 +0200 | [diff] [blame] | 441 | rc = cond_read_av_list(p, fp, &node->true_list, NULL); |
| 442 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | goto err; |
Dan Carpenter | fc5c126 | 2010-06-12 20:53:46 +0200 | [diff] [blame] | 444 | rc = cond_read_av_list(p, fp, &node->false_list, node->true_list); |
| 445 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | goto err; |
| 447 | return 0; |
| 448 | err: |
| 449 | cond_node_destroy(node); |
Dan Carpenter | fc5c126 | 2010-06-12 20:53:46 +0200 | [diff] [blame] | 450 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | int cond_read_list(struct policydb *p, void *fp) |
| 454 | { |
| 455 | struct cond_node *node, *last = NULL; |
Alexey Dobriyan | b5bf6c5 | 2005-09-03 15:55:17 -0700 | [diff] [blame] | 456 | __le32 buf[1]; |
| 457 | u32 i, len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | int rc; |
| 459 | |
| 460 | rc = next_entry(buf, fp, sizeof buf); |
Dan Carpenter | 5241c10 | 2010-06-12 20:51:40 +0200 | [diff] [blame] | 461 | if (rc) |
| 462 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | len = le32_to_cpu(buf[0]); |
| 465 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 466 | rc = avtab_alloc(&(p->te_cond_avtab), p->te_avtab.nel); |
| 467 | if (rc) |
| 468 | goto err; |
| 469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | for (i = 0; i < len; i++) { |
Dan Carpenter | 5241c10 | 2010-06-12 20:51:40 +0200 | [diff] [blame] | 471 | rc = -ENOMEM; |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 472 | node = kzalloc(sizeof(struct cond_node), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | if (!node) |
| 474 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
Dan Carpenter | 5241c10 | 2010-06-12 20:51:40 +0200 | [diff] [blame] | 476 | rc = cond_read_node(p, node, fp); |
| 477 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | goto err; |
| 479 | |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 480 | if (i == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | p->cond_list = node; |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 482 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | last->next = node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | last = node; |
| 485 | } |
| 486 | return 0; |
| 487 | err: |
| 488 | cond_list_destroy(p->cond_list); |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 489 | p->cond_list = NULL; |
Dan Carpenter | 5241c10 | 2010-06-12 20:51:40 +0200 | [diff] [blame] | 490 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |
| 492 | |
Eric Paris | cee74f4 | 2010-10-13 17:50:25 -0400 | [diff] [blame] | 493 | int cond_write_bool(void *vkey, void *datum, void *ptr) |
| 494 | { |
| 495 | char *key = vkey; |
| 496 | struct cond_bool_datum *booldatum = datum; |
| 497 | struct policy_data *pd = ptr; |
| 498 | void *fp = pd->fp; |
| 499 | __le32 buf[3]; |
| 500 | u32 len; |
| 501 | int rc; |
| 502 | |
| 503 | len = strlen(key); |
| 504 | buf[0] = cpu_to_le32(booldatum->value); |
| 505 | buf[1] = cpu_to_le32(booldatum->state); |
| 506 | buf[2] = cpu_to_le32(len); |
| 507 | rc = put_entry(buf, sizeof(u32), 3, fp); |
| 508 | if (rc) |
| 509 | return rc; |
| 510 | rc = put_entry(key, 1, len, fp); |
| 511 | if (rc) |
| 512 | return rc; |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * cond_write_cond_av_list doesn't write out the av_list nodes. |
| 518 | * Instead it writes out the key/value pairs from the avtab. This |
| 519 | * is necessary because there is no way to uniquely identifying rules |
| 520 | * in the avtab so it is not possible to associate individual rules |
| 521 | * in the avtab with a conditional without saving them as part of |
| 522 | * the conditional. This means that the avtab with the conditional |
| 523 | * rules will not be saved but will be rebuilt on policy load. |
| 524 | */ |
| 525 | static int cond_write_av_list(struct policydb *p, |
| 526 | struct cond_av_list *list, struct policy_file *fp) |
| 527 | { |
| 528 | __le32 buf[1]; |
| 529 | struct cond_av_list *cur_list; |
| 530 | u32 len; |
| 531 | int rc; |
| 532 | |
| 533 | len = 0; |
| 534 | for (cur_list = list; cur_list != NULL; cur_list = cur_list->next) |
| 535 | len++; |
| 536 | |
| 537 | buf[0] = cpu_to_le32(len); |
| 538 | rc = put_entry(buf, sizeof(u32), 1, fp); |
| 539 | if (rc) |
| 540 | return rc; |
| 541 | |
| 542 | if (len == 0) |
| 543 | return 0; |
| 544 | |
| 545 | for (cur_list = list; cur_list != NULL; cur_list = cur_list->next) { |
| 546 | rc = avtab_write_item(p, cur_list->node, fp); |
| 547 | if (rc) |
| 548 | return rc; |
| 549 | } |
| 550 | |
| 551 | return 0; |
| 552 | } |
| 553 | |
James Morris | 7b98a58 | 2011-08-30 12:52:32 +1000 | [diff] [blame] | 554 | static int cond_write_node(struct policydb *p, struct cond_node *node, |
Eric Paris | cee74f4 | 2010-10-13 17:50:25 -0400 | [diff] [blame] | 555 | struct policy_file *fp) |
| 556 | { |
| 557 | struct cond_expr *cur_expr; |
| 558 | __le32 buf[2]; |
| 559 | int rc; |
| 560 | u32 len = 0; |
| 561 | |
| 562 | buf[0] = cpu_to_le32(node->cur_state); |
| 563 | rc = put_entry(buf, sizeof(u32), 1, fp); |
| 564 | if (rc) |
| 565 | return rc; |
| 566 | |
| 567 | for (cur_expr = node->expr; cur_expr != NULL; cur_expr = cur_expr->next) |
| 568 | len++; |
| 569 | |
| 570 | buf[0] = cpu_to_le32(len); |
| 571 | rc = put_entry(buf, sizeof(u32), 1, fp); |
| 572 | if (rc) |
| 573 | return rc; |
| 574 | |
| 575 | for (cur_expr = node->expr; cur_expr != NULL; cur_expr = cur_expr->next) { |
| 576 | buf[0] = cpu_to_le32(cur_expr->expr_type); |
| 577 | buf[1] = cpu_to_le32(cur_expr->bool); |
| 578 | rc = put_entry(buf, sizeof(u32), 2, fp); |
| 579 | if (rc) |
| 580 | return rc; |
| 581 | } |
| 582 | |
| 583 | rc = cond_write_av_list(p, node->true_list, fp); |
| 584 | if (rc) |
| 585 | return rc; |
| 586 | rc = cond_write_av_list(p, node->false_list, fp); |
| 587 | if (rc) |
| 588 | return rc; |
| 589 | |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | int cond_write_list(struct policydb *p, struct cond_node *list, void *fp) |
| 594 | { |
| 595 | struct cond_node *cur; |
| 596 | u32 len; |
| 597 | __le32 buf[1]; |
| 598 | int rc; |
| 599 | |
| 600 | len = 0; |
| 601 | for (cur = list; cur != NULL; cur = cur->next) |
| 602 | len++; |
| 603 | buf[0] = cpu_to_le32(len); |
| 604 | rc = put_entry(buf, sizeof(u32), 1, fp); |
| 605 | if (rc) |
| 606 | return rc; |
| 607 | |
| 608 | for (cur = list; cur != NULL; cur = cur->next) { |
| 609 | rc = cond_write_node(p, cur, fp); |
| 610 | if (rc) |
| 611 | return rc; |
| 612 | } |
| 613 | |
| 614 | return 0; |
| 615 | } |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 616 | |
| 617 | void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key, |
| 618 | struct extended_perms_decision *xpermd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
| 620 | struct avtab_node *node; |
| 621 | |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 622 | if (!ctab || !key || !xpermd) |
| 623 | return; |
| 624 | |
| 625 | for (node = avtab_search_node(ctab, key); node; |
| 626 | node = avtab_search_node_next(node, key->specified)) { |
| 627 | if (node->key.specified & AVTAB_ENABLED) |
| 628 | services_compute_xperms_decision(xpermd, node); |
| 629 | } |
| 630 | return; |
| 631 | |
| 632 | } |
| 633 | /* Determine whether additional permissions are granted by the conditional |
| 634 | * av table, and if so, add them to the result |
| 635 | */ |
| 636 | void cond_compute_av(struct avtab *ctab, struct avtab_key *key, |
| 637 | struct av_decision *avd, struct extended_perms *xperms) |
| 638 | { |
| 639 | struct avtab_node *node; |
| 640 | |
| 641 | if (!ctab || !key || !avd || !xperms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | return; |
| 643 | |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 644 | for (node = avtab_search_node(ctab, key); node; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 645 | node = avtab_search_node_next(node, key->specified)) { |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 646 | if ((u16)(AVTAB_ALLOWED|AVTAB_ENABLED) == |
| 647 | (node->key.specified & (AVTAB_ALLOWED|AVTAB_ENABLED))) |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 648 | avd->allowed |= node->datum.u.data; |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 649 | if ((u16)(AVTAB_AUDITDENY|AVTAB_ENABLED) == |
| 650 | (node->key.specified & (AVTAB_AUDITDENY|AVTAB_ENABLED))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | /* Since a '0' in an auditdeny mask represents a |
| 652 | * permission we do NOT want to audit (dontaudit), we use |
| 653 | * the '&' operand to ensure that all '0's in the mask |
| 654 | * are retained (much unlike the allow and auditallow cases). |
| 655 | */ |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 656 | avd->auditdeny &= node->datum.u.data; |
Eric Paris | 7c2b240 | 2008-04-18 17:38:29 -0400 | [diff] [blame] | 657 | if ((u16)(AVTAB_AUDITALLOW|AVTAB_ENABLED) == |
| 658 | (node->key.specified & (AVTAB_AUDITALLOW|AVTAB_ENABLED))) |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 659 | avd->auditallow |= node->datum.u.data; |
| 660 | if ((node->key.specified & AVTAB_ENABLED) && |
| 661 | (node->key.specified & AVTAB_XPERMS)) |
| 662 | services_compute_xperms_drivers(xperms, node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | return; |
| 665 | } |