1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2017-2020, Linaro Limited 4 */ 5 6 #include <assert.h> 7 #include <bitstring.h> 8 #include <pkcs11_ta.h> 9 #include <stdlib.h> 10 #include <string.h> 11 #include <util.h> 12 #include <tee_internal_api.h> 13 #include <tee_internal_api_extensions.h> 14 #include <trace.h> 15 16 #include "attributes.h" 17 #include "pkcs11_helpers.h" 18 #include "sanitize_object.h" 19 #include "serializer.h" 20 #include "token_capabilities.h" 21 22 /* 23 * Functions to generate a serialized object. 24 * References are pointers to struct serializer. 25 */ 26 27 bool sanitize_consistent_class_and_type(struct obj_attrs *attrs) 28 { 29 switch (get_class(attrs)) { 30 case PKCS11_CKO_DATA: 31 case PKCS11_CKO_CERTIFICATE: 32 return true; 33 case PKCS11_CKO_SECRET_KEY: 34 return key_type_is_symm_key(get_key_type(attrs)); 35 case PKCS11_CKO_MECHANISM: 36 return mechanism_is_valid(get_mechanism_type(attrs)); 37 case PKCS11_CKO_PUBLIC_KEY: 38 case PKCS11_CKO_PRIVATE_KEY: 39 return key_type_is_asymm_key(get_key_type(attrs)); 40 case PKCS11_CKO_OTP_KEY: 41 case PKCS11_CKO_DOMAIN_PARAMETERS: 42 case PKCS11_CKO_HW_FEATURE: 43 default: 44 return false; 45 } 46 47 return false; 48 } 49 50 static enum pkcs11_rc read_attr_advance(void *buf, size_t blen, size_t *pos, 51 struct pkcs11_attribute_head *attr, 52 void **data) 53 { 54 uint8_t *b = buf; 55 size_t data_pos = 0; 56 size_t next_pos = 0; 57 58 if (ADD_OVERFLOW(*pos, sizeof(*attr), &data_pos) || data_pos > blen) 59 return PKCS11_CKR_FUNCTION_FAILED; 60 TEE_MemMove(attr, b + *pos, sizeof(*attr)); 61 62 if (ADD_OVERFLOW(data_pos, attr->size, &next_pos) || next_pos > blen) 63 return PKCS11_CKR_FUNCTION_FAILED; 64 65 *data = b + data_pos; 66 *pos = next_pos; 67 68 return PKCS11_CKR_OK; 69 } 70 71 /* Sanitize class/type in a client attribute list */ 72 static enum pkcs11_rc sanitize_class_and_type(struct obj_attrs **dst, void *src, 73 size_t src_size, 74 uint32_t class_hint, 75 uint32_t type_hint) 76 { 77 uint32_t class_found = PKCS11_CKO_UNDEFINED_ID; 78 size_t pos = sizeof(struct pkcs11_object_head); 79 struct pkcs11_attribute_head cli_ref = { }; 80 uint32_t type_found = PKCS11_UNDEFINED_ID; 81 enum pkcs11_rc rc = PKCS11_CKR_OK; 82 void *data = NULL; 83 84 while (pos != src_size) { 85 rc = read_attr_advance(src, src_size, &pos, &cli_ref, &data); 86 if (rc) 87 goto err; 88 89 if (cli_ref.id == PKCS11_CKA_CLASS) { 90 uint32_t class = 0; 91 92 if (cli_ref.size != sizeof(class)) { 93 rc = PKCS11_CKR_TEMPLATE_INCONSISTENT; 94 goto err; 95 } 96 97 TEE_MemMove(&class, data, sizeof(class)); 98 99 if (class_found != PKCS11_CKO_UNDEFINED_ID && 100 class_found != class) { 101 EMSG("Conflicting class value"); 102 rc = PKCS11_CKR_TEMPLATE_INCONSISTENT; 103 goto err; 104 } 105 106 class_found = class; 107 continue; 108 } 109 110 /* The attribute is a type-in-class */ 111 if (pkcs11_attr_is_type(cli_ref.id)) { 112 uint32_t type = 0; 113 114 if (cli_ref.size != sizeof(type)) { 115 rc = PKCS11_CKR_TEMPLATE_INCONSISTENT; 116 goto err; 117 } 118 119 TEE_MemMove(&type, data, sizeof(type)); 120 121 if (type_found != PKCS11_CKK_UNDEFINED_ID && 122 type_found != type) { 123 EMSG("Conflicting type-in-class value"); 124 rc = PKCS11_CKR_TEMPLATE_INCONSISTENT; 125 goto err; 126 } 127 128 type_found = type; 129 } 130 } 131 132 if (class_found != PKCS11_CKO_UNDEFINED_ID) { 133 rc = add_attribute(dst, PKCS11_CKA_CLASS, 134 &class_found, sizeof(class_found)); 135 if (rc) 136 return rc; 137 } else { 138 if (class_hint != PKCS11_CKO_UNDEFINED_ID) { 139 rc = add_attribute(dst, PKCS11_CKA_CLASS, 140 &class_hint, sizeof(class_hint)); 141 if (rc) 142 return rc; 143 } 144 } 145 146 if (type_found != PKCS11_UNDEFINED_ID) { 147 rc = add_attribute(dst, PKCS11_CKA_KEY_TYPE, 148 &type_found, sizeof(type_found)); 149 if (rc) 150 return rc; 151 } else { 152 if (type_hint != PKCS11_UNDEFINED_ID) { 153 rc = add_attribute(dst, PKCS11_CKA_KEY_TYPE, 154 &type_hint, sizeof(type_hint)); 155 if (rc) 156 return rc; 157 } 158 } 159 160 return PKCS11_CKR_OK; 161 162 err: 163 trace_attributes_from_api_head("bad-template", src, src_size); 164 165 return rc; 166 } 167 168 static enum pkcs11_rc sanitize_boolprops(struct obj_attrs **dst, void *src, 169 size_t src_size) 170 { 171 bitstr_t bit_decl(seen_attrs, PKCS11_BOOLPROPS_MAX_COUNT) = { 0 }; 172 bitstr_t bit_decl(boolprops, PKCS11_BOOLPROPS_MAX_COUNT) = { 0 }; 173 size_t pos = sizeof(struct pkcs11_object_head); 174 struct pkcs11_attribute_head cli_ref = { }; 175 enum pkcs11_rc rc = PKCS11_CKR_OK; 176 bool value = false; 177 void *data = NULL; 178 int idx = 0; 179 180 /* 181 * We're keeping track of seen boolean attributes in the bitstring 182 * seen_attrs. The bitstring boolprops holds the recorded value 183 * once seen_attrs has been updated. 184 */ 185 186 while (pos != src_size) { 187 rc = read_attr_advance(src, src_size, &pos, &cli_ref, &data); 188 if (rc) 189 return rc; 190 191 idx = pkcs11_attr2boolprop_shift(cli_ref.id); 192 if (idx < 0) 193 continue; /* skipping non-boolean attributes */ 194 195 if (idx >= PKCS11_BOOLPROPS_MAX_COUNT || 196 cli_ref.size != sizeof(uint8_t)) 197 return PKCS11_CKR_FUNCTION_FAILED; 198 199 value = *(uint8_t *)data; 200 201 /* 202 * If this attribute has already been seen, check that it 203 * still holds the same value as last time. 204 */ 205 if (bit_test(seen_attrs, idx) && 206 value != (bool)bit_test(boolprops, idx)) 207 return PKCS11_CKR_TEMPLATE_INCONSISTENT; 208 209 if (value) 210 bit_set(boolprops, idx); 211 212 if (!bit_test(seen_attrs, idx)) { 213 uint8_t pkcs11_bool = value; 214 215 rc = add_attribute(dst, cli_ref.id, &pkcs11_bool, 216 sizeof(pkcs11_bool)); 217 if (rc) 218 return rc; 219 } 220 bit_set(seen_attrs, idx); 221 } 222 223 return PKCS11_CKR_OK; 224 } 225 226 static uint32_t sanitize_indirect_attr(struct obj_attrs **dst, 227 struct pkcs11_attribute_head *cli_ref, 228 char *data) 229 { 230 struct obj_attrs *obj2 = NULL; 231 enum pkcs11_rc rc = PKCS11_CKR_OK; 232 233 assert(pkcs11_attr_has_indirect_attributes(cli_ref->id)); 234 235 /* Build a new serial object while sanitizing the attributes list */ 236 rc = sanitize_client_object(&obj2, data, cli_ref->size, 237 PKCS11_CKO_UNDEFINED_ID, 238 PKCS11_UNDEFINED_ID); 239 if (rc) 240 goto out; 241 242 rc = add_attribute(dst, cli_ref->id, obj2, 243 sizeof(*obj2) + obj2->attrs_size); 244 out: 245 TEE_Free(obj2); 246 return rc; 247 } 248 249 enum pkcs11_rc sanitize_client_object(struct obj_attrs **dst, void *src, 250 size_t size, uint32_t class_hint, 251 uint32_t type_hint) 252 { 253 struct pkcs11_attribute_head cli_ref = { }; 254 struct pkcs11_object_head head = { }; 255 enum pkcs11_rc rc = PKCS11_CKR_OK; 256 size_t pos = sizeof(head); 257 size_t sz_from_hdr = 0; 258 void *data = NULL; 259 260 if (size < sizeof(head)) 261 return PKCS11_CKR_ARGUMENTS_BAD; 262 263 TEE_MemMove(&head, src, sizeof(head)); 264 265 if (ADD_OVERFLOW(sizeof(head), head.attrs_size, &sz_from_hdr) || 266 size < sz_from_hdr) 267 return PKCS11_CKR_ARGUMENTS_BAD; 268 269 rc = init_attributes_head(dst); 270 if (rc) 271 return rc; 272 273 rc = sanitize_class_and_type(dst, src, sz_from_hdr, class_hint, 274 type_hint); 275 if (rc) 276 return rc; 277 278 rc = sanitize_boolprops(dst, src, sz_from_hdr); 279 if (rc) 280 return rc; 281 282 while (pos != sz_from_hdr) { 283 rc = read_attr_advance(src, sz_from_hdr, &pos, &cli_ref, &data); 284 if (rc) 285 return rc; 286 287 if (cli_ref.id == PKCS11_CKA_CLASS || 288 pkcs11_attr_is_type(cli_ref.id) || 289 pkcs11_attr_is_boolean(cli_ref.id)) 290 continue; 291 292 if (pkcs11_attr_has_indirect_attributes(cli_ref.id)) { 293 rc = sanitize_indirect_attr(dst, &cli_ref, data); 294 if (rc) 295 return rc; 296 297 continue; 298 } 299 300 if (!valid_pkcs11_attribute_id(cli_ref.id, cli_ref.size)) { 301 EMSG("Invalid attribute id %#"PRIx32, cli_ref.id); 302 return PKCS11_CKR_TEMPLATE_INCONSISTENT; 303 } 304 305 rc = add_attribute(dst, cli_ref.id, data, cli_ref.size); 306 if (rc) 307 return rc; 308 } 309 310 return rc; 311 } 312 313 /* 314 * Debug: dump object attribute array to output trace 315 */ 316 317 static void __trace_attributes(char *prefix, void *src, void *end) 318 { 319 size_t next = 0; 320 char *prefix2 = NULL; 321 size_t prefix_len = strlen(prefix); 322 char *cur = src; 323 324 /* append 4 spaces to the prefix plus terminal '\0' */ 325 prefix2 = TEE_Malloc(prefix_len + 1 + 4, TEE_MALLOC_FILL_ZERO); 326 if (!prefix2) 327 return; 328 329 TEE_MemMove(prefix2, prefix, prefix_len + 1); 330 TEE_MemFill(prefix2 + prefix_len, ' ', 4); 331 *(prefix2 + prefix_len + 4) = '\0'; 332 333 for (; cur < (char *)end; cur += next) { 334 struct pkcs11_attribute_head pkcs11_ref; 335 uint8_t data[4] = { 0 }; 336 uint32_t data_u32 = 0; 337 char *start = NULL; 338 339 TEE_MemMove(&pkcs11_ref, cur, sizeof(pkcs11_ref)); 340 TEE_MemMove(&data[0], cur + sizeof(pkcs11_ref), 341 MIN(pkcs11_ref.size, sizeof(data))); 342 TEE_MemMove(&data_u32, cur + sizeof(pkcs11_ref), 343 sizeof(data_u32)); 344 345 next = sizeof(pkcs11_ref) + pkcs11_ref.size; 346 347 DMSG_RAW("%s Attr %s / %s (%#04"PRIx32" %"PRIu32"-byte)", 348 prefix, id2str_attr(pkcs11_ref.id), 349 id2str_attr_value(pkcs11_ref.id, pkcs11_ref.size, 350 cur + sizeof(pkcs11_ref)), 351 pkcs11_ref.id, pkcs11_ref.size); 352 353 switch (pkcs11_ref.size) { 354 case 0: 355 break; 356 case 1: 357 DMSG_RAW("%s Attr byte value: %02x", prefix, data[0]); 358 break; 359 case 2: 360 DMSG_RAW("%s Attr byte value: %02x %02x", 361 prefix, data[0], data[1]); 362 break; 363 case 3: 364 DMSG_RAW("%s Attr byte value: %02x %02x %02x", 365 prefix, data[0], data[1], data[2]); 366 break; 367 case 4: 368 DMSG_RAW("%s Attr byte value: %02x %02x %02x %02x", 369 prefix, data[0], data[1], data[2], data[3]); 370 break; 371 default: 372 DMSG_RAW("%s Attr byte value: %02x %02x %02x %02x ...", 373 prefix, data[0], data[1], data[2], data[3]); 374 break; 375 } 376 377 switch (pkcs11_ref.id) { 378 case PKCS11_CKA_WRAP_TEMPLATE: 379 case PKCS11_CKA_UNWRAP_TEMPLATE: 380 case PKCS11_CKA_DERIVE_TEMPLATE: 381 start = cur + sizeof(pkcs11_ref); 382 trace_attributes_from_api_head(prefix2, start, 383 (char *)end - start); 384 break; 385 default: 386 break; 387 } 388 } 389 390 /* Sanity */ 391 if (cur != (char *)end) 392 EMSG("Warning: unexpected alignment issue"); 393 394 TEE_Free(prefix2); 395 } 396 397 void trace_attributes_from_api_head(const char *prefix, void *ref, size_t size) 398 { 399 struct pkcs11_object_head head = { }; 400 char *pre = NULL; 401 size_t offset = 0; 402 403 TEE_MemMove(&head, ref, sizeof(head)); 404 405 if (size > sizeof(head) + head.attrs_size) { 406 EMSG("template overflows client buffer (%zu/%zu)", 407 size, sizeof(head) + head.attrs_size); 408 return; 409 } 410 411 pre = TEE_Malloc(prefix ? strlen(prefix) + 2 : 2, TEE_MALLOC_FILL_ZERO); 412 if (!pre) { 413 EMSG("%s: out of memory", prefix); 414 return; 415 } 416 if (prefix) 417 TEE_MemMove(pre, prefix, strlen(prefix)); 418 419 DMSG_RAW("%s,--- (serial object) Attributes list --------", pre); 420 DMSG_RAW("%s| %"PRIu32" item(s) - %"PRIu32" bytes", 421 pre, head.attrs_count, head.attrs_size); 422 423 offset = sizeof(head); 424 pre[prefix ? strlen(prefix) : 0] = '|'; 425 __trace_attributes(pre, (char *)ref + offset, 426 (char *)ref + offset + head.attrs_size); 427 428 DMSG_RAW("%s`-----------------------", prefix ? prefix : ""); 429 430 TEE_Free(pre); 431 } 432