1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> 4 * Copyright (C) 2018 Samsung Electronics Co., Ltd. 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/fs.h> 9 #include <linux/uaccess.h> 10 #include <linux/backing-dev.h> 11 #include <linux/writeback.h> 12 #include <linux/uio.h> 13 #include <linux/xattr.h> 14 #include <crypto/hash.h> 15 #include <crypto/aead.h> 16 #include <linux/random.h> 17 #include <linux/scatterlist.h> 18 19 #include "auth.h" 20 #include "glob.h" 21 22 #include <linux/fips.h> 23 #include <crypto/des.h> 24 25 #include "server.h" 26 #include "smb_common.h" 27 #include "connection.h" 28 #include "mgmt/user_session.h" 29 #include "mgmt/user_config.h" 30 #include "crypto_ctx.h" 31 #include "transport_ipc.h" 32 #include "../common/arc4.h" 33 34 /* 35 * Fixed format data defining GSS header and fixed string 36 * "not_defined_in_RFC4178@please_ignore". 37 * So sec blob data in neg phase could be generated statically. 38 */ 39 static char NEGOTIATE_GSS_HEADER[AUTH_GSS_LENGTH] = { 40 #ifdef CONFIG_SMB_SERVER_KERBEROS5 41 0x60, 0x5e, 0x06, 0x06, 0x2b, 0x06, 0x01, 0x05, 42 0x05, 0x02, 0xa0, 0x54, 0x30, 0x52, 0xa0, 0x24, 43 0x30, 0x22, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 44 0xf7, 0x12, 0x01, 0x02, 0x02, 0x06, 0x09, 0x2a, 45 0x86, 0x48, 0x82, 0xf7, 0x12, 0x01, 0x02, 0x02, 46 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x82, 47 0x37, 0x02, 0x02, 0x0a, 0xa3, 0x2a, 0x30, 0x28, 48 0xa0, 0x26, 0x1b, 0x24, 0x6e, 0x6f, 0x74, 0x5f, 49 0x64, 0x65, 0x66, 0x69, 0x6e, 0x65, 0x64, 0x5f, 50 0x69, 0x6e, 0x5f, 0x52, 0x46, 0x43, 0x34, 0x31, 51 0x37, 0x38, 0x40, 0x70, 0x6c, 0x65, 0x61, 0x73, 52 0x65, 0x5f, 0x69, 0x67, 0x6e, 0x6f, 0x72, 0x65 53 #else 54 0x60, 0x48, 0x06, 0x06, 0x2b, 0x06, 0x01, 0x05, 55 0x05, 0x02, 0xa0, 0x3e, 0x30, 0x3c, 0xa0, 0x0e, 56 0x30, 0x0c, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, 57 0x01, 0x82, 0x37, 0x02, 0x02, 0x0a, 0xa3, 0x2a, 58 0x30, 0x28, 0xa0, 0x26, 0x1b, 0x24, 0x6e, 0x6f, 59 0x74, 0x5f, 0x64, 0x65, 0x66, 0x69, 0x6e, 0x65, 60 0x64, 0x5f, 0x69, 0x6e, 0x5f, 0x52, 0x46, 0x43, 61 0x34, 0x31, 0x37, 0x38, 0x40, 0x70, 0x6c, 0x65, 62 0x61, 0x73, 0x65, 0x5f, 0x69, 0x67, 0x6e, 0x6f, 63 0x72, 0x65 64 #endif 65 }; 66 67 void ksmbd_copy_gss_neg_header(void *buf) 68 { 69 memcpy(buf, NEGOTIATE_GSS_HEADER, AUTH_GSS_LENGTH); 70 } 71 72 /** 73 * ksmbd_gen_sess_key() - function to generate session key 74 * @sess: session of connection 75 * @hash: source hash value to be used for find session key 76 * @hmac: source hmac value to be used for finding session key 77 * 78 */ 79 static int ksmbd_gen_sess_key(struct ksmbd_session *sess, char *hash, 80 char *hmac) 81 { 82 struct ksmbd_crypto_ctx *ctx; 83 int rc; 84 85 ctx = ksmbd_crypto_ctx_find_hmacmd5(); 86 if (!ctx) { 87 ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n"); 88 return -ENOMEM; 89 } 90 91 rc = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx), 92 hash, 93 CIFS_HMAC_MD5_HASH_SIZE); 94 if (rc) { 95 ksmbd_debug(AUTH, "hmacmd5 set key fail error %d\n", rc); 96 goto out; 97 } 98 99 rc = crypto_shash_init(CRYPTO_HMACMD5(ctx)); 100 if (rc) { 101 ksmbd_debug(AUTH, "could not init hmacmd5 error %d\n", rc); 102 goto out; 103 } 104 105 rc = crypto_shash_update(CRYPTO_HMACMD5(ctx), 106 hmac, 107 SMB2_NTLMV2_SESSKEY_SIZE); 108 if (rc) { 109 ksmbd_debug(AUTH, "Could not update with response error %d\n", rc); 110 goto out; 111 } 112 113 rc = crypto_shash_final(CRYPTO_HMACMD5(ctx), sess->sess_key); 114 if (rc) { 115 ksmbd_debug(AUTH, "Could not generate hmacmd5 hash error %d\n", rc); 116 goto out; 117 } 118 119 out: 120 ksmbd_release_crypto_ctx(ctx); 121 return rc; 122 } 123 124 static int calc_ntlmv2_hash(struct ksmbd_conn *conn, struct ksmbd_session *sess, 125 char *ntlmv2_hash, char *dname) 126 { 127 int ret, len, conv_len; 128 wchar_t *domain = NULL; 129 __le16 *uniname = NULL; 130 struct ksmbd_crypto_ctx *ctx; 131 132 ctx = ksmbd_crypto_ctx_find_hmacmd5(); 133 if (!ctx) { 134 ksmbd_debug(AUTH, "can't generate ntlmv2 hash\n"); 135 return -ENOMEM; 136 } 137 138 ret = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx), 139 user_passkey(sess->user), 140 CIFS_ENCPWD_SIZE); 141 if (ret) { 142 ksmbd_debug(AUTH, "Could not set NT Hash as a key\n"); 143 goto out; 144 } 145 146 ret = crypto_shash_init(CRYPTO_HMACMD5(ctx)); 147 if (ret) { 148 ksmbd_debug(AUTH, "could not init hmacmd5\n"); 149 goto out; 150 } 151 152 /* convert user_name to unicode */ 153 len = strlen(user_name(sess->user)); 154 uniname = kzalloc(2 + UNICODE_LEN(len), KSMBD_DEFAULT_GFP); 155 if (!uniname) { 156 ret = -ENOMEM; 157 goto out; 158 } 159 160 conv_len = smb_strtoUTF16(uniname, user_name(sess->user), len, 161 conn->local_nls); 162 if (conv_len < 0 || conv_len > len) { 163 ret = -EINVAL; 164 goto out; 165 } 166 UniStrupr(uniname); 167 168 ret = crypto_shash_update(CRYPTO_HMACMD5(ctx), 169 (char *)uniname, 170 UNICODE_LEN(conv_len)); 171 if (ret) { 172 ksmbd_debug(AUTH, "Could not update with user\n"); 173 goto out; 174 } 175 176 /* Convert domain name or conn name to unicode and uppercase */ 177 len = strlen(dname); 178 domain = kzalloc(2 + UNICODE_LEN(len), KSMBD_DEFAULT_GFP); 179 if (!domain) { 180 ret = -ENOMEM; 181 goto out; 182 } 183 184 conv_len = smb_strtoUTF16((__le16 *)domain, dname, len, 185 conn->local_nls); 186 if (conv_len < 0 || conv_len > len) { 187 ret = -EINVAL; 188 goto out; 189 } 190 191 ret = crypto_shash_update(CRYPTO_HMACMD5(ctx), 192 (char *)domain, 193 UNICODE_LEN(conv_len)); 194 if (ret) { 195 ksmbd_debug(AUTH, "Could not update with domain\n"); 196 goto out; 197 } 198 199 ret = crypto_shash_final(CRYPTO_HMACMD5(ctx), ntlmv2_hash); 200 if (ret) 201 ksmbd_debug(AUTH, "Could not generate md5 hash\n"); 202 out: 203 kfree(uniname); 204 kfree(domain); 205 ksmbd_release_crypto_ctx(ctx); 206 return ret; 207 } 208 209 /** 210 * ksmbd_auth_ntlmv2() - NTLMv2 authentication handler 211 * @conn: connection 212 * @sess: session of connection 213 * @ntlmv2: NTLMv2 challenge response 214 * @blen: NTLMv2 blob length 215 * @domain_name: domain name 216 * @cryptkey: session crypto key 217 * 218 * Return: 0 on success, error number on error 219 */ 220 int ksmbd_auth_ntlmv2(struct ksmbd_conn *conn, struct ksmbd_session *sess, 221 struct ntlmv2_resp *ntlmv2, int blen, char *domain_name, 222 char *cryptkey) 223 { 224 char ntlmv2_hash[CIFS_ENCPWD_SIZE]; 225 char ntlmv2_rsp[CIFS_HMAC_MD5_HASH_SIZE]; 226 struct ksmbd_crypto_ctx *ctx = NULL; 227 char *construct = NULL; 228 int rc, len; 229 230 rc = calc_ntlmv2_hash(conn, sess, ntlmv2_hash, domain_name); 231 if (rc) { 232 ksmbd_debug(AUTH, "could not get v2 hash rc %d\n", rc); 233 goto out; 234 } 235 236 ctx = ksmbd_crypto_ctx_find_hmacmd5(); 237 if (!ctx) { 238 ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n"); 239 return -ENOMEM; 240 } 241 242 rc = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx), 243 ntlmv2_hash, 244 CIFS_HMAC_MD5_HASH_SIZE); 245 if (rc) { 246 ksmbd_debug(AUTH, "Could not set NTLMV2 Hash as a key\n"); 247 goto out; 248 } 249 250 rc = crypto_shash_init(CRYPTO_HMACMD5(ctx)); 251 if (rc) { 252 ksmbd_debug(AUTH, "Could not init hmacmd5\n"); 253 goto out; 254 } 255 256 len = CIFS_CRYPTO_KEY_SIZE + blen; 257 construct = kzalloc(len, KSMBD_DEFAULT_GFP); 258 if (!construct) { 259 rc = -ENOMEM; 260 goto out; 261 } 262 263 memcpy(construct, cryptkey, CIFS_CRYPTO_KEY_SIZE); 264 memcpy(construct + CIFS_CRYPTO_KEY_SIZE, &ntlmv2->blob_signature, blen); 265 266 rc = crypto_shash_update(CRYPTO_HMACMD5(ctx), construct, len); 267 if (rc) { 268 ksmbd_debug(AUTH, "Could not update with response\n"); 269 goto out; 270 } 271 272 rc = crypto_shash_final(CRYPTO_HMACMD5(ctx), ntlmv2_rsp); 273 if (rc) { 274 ksmbd_debug(AUTH, "Could not generate md5 hash\n"); 275 goto out; 276 } 277 ksmbd_release_crypto_ctx(ctx); 278 ctx = NULL; 279 280 rc = ksmbd_gen_sess_key(sess, ntlmv2_hash, ntlmv2_rsp); 281 if (rc) { 282 ksmbd_debug(AUTH, "Could not generate sess key\n"); 283 goto out; 284 } 285 286 if (memcmp(ntlmv2->ntlmv2_hash, ntlmv2_rsp, CIFS_HMAC_MD5_HASH_SIZE) != 0) 287 rc = -EINVAL; 288 out: 289 if (ctx) 290 ksmbd_release_crypto_ctx(ctx); 291 kfree(construct); 292 return rc; 293 } 294 295 /** 296 * ksmbd_decode_ntlmssp_auth_blob() - helper function to construct 297 * authenticate blob 298 * @authblob: authenticate blob source pointer 299 * @blob_len: length of the @authblob message 300 * @conn: connection 301 * @sess: session of connection 302 * 303 * Return: 0 on success, error number on error 304 */ 305 int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob, 306 int blob_len, struct ksmbd_conn *conn, 307 struct ksmbd_session *sess) 308 { 309 char *domain_name; 310 unsigned int nt_off, dn_off; 311 unsigned short nt_len, dn_len; 312 int ret; 313 314 if (blob_len < sizeof(struct authenticate_message)) { 315 ksmbd_debug(AUTH, "negotiate blob len %d too small\n", 316 blob_len); 317 return -EINVAL; 318 } 319 320 if (memcmp(authblob->Signature, "NTLMSSP", 8)) { 321 ksmbd_debug(AUTH, "blob signature incorrect %s\n", 322 authblob->Signature); 323 return -EINVAL; 324 } 325 326 nt_off = le32_to_cpu(authblob->NtChallengeResponse.BufferOffset); 327 nt_len = le16_to_cpu(authblob->NtChallengeResponse.Length); 328 dn_off = le32_to_cpu(authblob->DomainName.BufferOffset); 329 dn_len = le16_to_cpu(authblob->DomainName.Length); 330 331 if (blob_len < (u64)dn_off + dn_len || blob_len < (u64)nt_off + nt_len || 332 nt_len < CIFS_ENCPWD_SIZE) 333 return -EINVAL; 334 335 /* TODO : use domain name that imported from configuration file */ 336 domain_name = smb_strndup_from_utf16((const char *)authblob + dn_off, 337 dn_len, true, conn->local_nls); 338 if (IS_ERR(domain_name)) 339 return PTR_ERR(domain_name); 340 341 /* process NTLMv2 authentication */ 342 ksmbd_debug(AUTH, "decode_ntlmssp_authenticate_blob dname%s\n", 343 domain_name); 344 ret = ksmbd_auth_ntlmv2(conn, sess, 345 (struct ntlmv2_resp *)((char *)authblob + nt_off), 346 nt_len - CIFS_ENCPWD_SIZE, 347 domain_name, conn->ntlmssp.cryptkey); 348 kfree(domain_name); 349 350 /* The recovered secondary session key */ 351 if (conn->ntlmssp.client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) { 352 struct arc4_ctx *ctx_arc4; 353 unsigned int sess_key_off, sess_key_len; 354 355 sess_key_off = le32_to_cpu(authblob->SessionKey.BufferOffset); 356 sess_key_len = le16_to_cpu(authblob->SessionKey.Length); 357 358 if (blob_len < (u64)sess_key_off + sess_key_len) 359 return -EINVAL; 360 361 if (sess_key_len > CIFS_KEY_SIZE) 362 return -EINVAL; 363 364 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), KSMBD_DEFAULT_GFP); 365 if (!ctx_arc4) 366 return -ENOMEM; 367 368 cifs_arc4_setkey(ctx_arc4, sess->sess_key, 369 SMB2_NTLMV2_SESSKEY_SIZE); 370 cifs_arc4_crypt(ctx_arc4, sess->sess_key, 371 (char *)authblob + sess_key_off, sess_key_len); 372 kfree_sensitive(ctx_arc4); 373 } 374 375 return ret; 376 } 377 378 /** 379 * ksmbd_decode_ntlmssp_neg_blob() - helper function to construct 380 * negotiate blob 381 * @negblob: negotiate blob source pointer 382 * @blob_len: length of the @authblob message 383 * @conn: connection 384 * 385 */ 386 int ksmbd_decode_ntlmssp_neg_blob(struct negotiate_message *negblob, 387 int blob_len, struct ksmbd_conn *conn) 388 { 389 if (blob_len < sizeof(struct negotiate_message)) { 390 ksmbd_debug(AUTH, "negotiate blob len %d too small\n", 391 blob_len); 392 return -EINVAL; 393 } 394 395 if (memcmp(negblob->Signature, "NTLMSSP", 8)) { 396 ksmbd_debug(AUTH, "blob signature incorrect %s\n", 397 negblob->Signature); 398 return -EINVAL; 399 } 400 401 conn->ntlmssp.client_flags = le32_to_cpu(negblob->NegotiateFlags); 402 return 0; 403 } 404 405 /** 406 * ksmbd_build_ntlmssp_challenge_blob() - helper function to construct 407 * challenge blob 408 * @chgblob: challenge blob source pointer to initialize 409 * @conn: connection 410 * 411 */ 412 unsigned int 413 ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob, 414 struct ksmbd_conn *conn) 415 { 416 struct target_info *tinfo; 417 wchar_t *name; 418 __u8 *target_name; 419 unsigned int flags, blob_off, blob_len, type, target_info_len = 0; 420 int len, uni_len, conv_len; 421 int cflags = conn->ntlmssp.client_flags; 422 423 memcpy(chgblob->Signature, NTLMSSP_SIGNATURE, 8); 424 chgblob->MessageType = NtLmChallenge; 425 426 flags = NTLMSSP_NEGOTIATE_UNICODE | 427 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_TARGET_TYPE_SERVER | 428 NTLMSSP_NEGOTIATE_TARGET_INFO; 429 430 if (cflags & NTLMSSP_NEGOTIATE_SIGN) { 431 flags |= NTLMSSP_NEGOTIATE_SIGN; 432 flags |= cflags & (NTLMSSP_NEGOTIATE_128 | 433 NTLMSSP_NEGOTIATE_56); 434 } 435 436 if (cflags & NTLMSSP_NEGOTIATE_SEAL && smb3_encryption_negotiated(conn)) 437 flags |= NTLMSSP_NEGOTIATE_SEAL; 438 439 if (cflags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN) 440 flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; 441 442 if (cflags & NTLMSSP_REQUEST_TARGET) 443 flags |= NTLMSSP_REQUEST_TARGET; 444 445 if (conn->use_spnego && 446 (cflags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) 447 flags |= NTLMSSP_NEGOTIATE_EXTENDED_SEC; 448 449 if (cflags & NTLMSSP_NEGOTIATE_KEY_XCH) 450 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 451 452 chgblob->NegotiateFlags = cpu_to_le32(flags); 453 len = strlen(ksmbd_netbios_name()); 454 name = kmalloc(2 + UNICODE_LEN(len), KSMBD_DEFAULT_GFP); 455 if (!name) 456 return -ENOMEM; 457 458 conv_len = smb_strtoUTF16((__le16 *)name, ksmbd_netbios_name(), len, 459 conn->local_nls); 460 if (conv_len < 0 || conv_len > len) { 461 kfree(name); 462 return -EINVAL; 463 } 464 465 uni_len = UNICODE_LEN(conv_len); 466 467 blob_off = sizeof(struct challenge_message); 468 blob_len = blob_off + uni_len; 469 470 chgblob->TargetName.Length = cpu_to_le16(uni_len); 471 chgblob->TargetName.MaximumLength = cpu_to_le16(uni_len); 472 chgblob->TargetName.BufferOffset = cpu_to_le32(blob_off); 473 474 /* Initialize random conn challenge */ 475 get_random_bytes(conn->ntlmssp.cryptkey, sizeof(__u64)); 476 memcpy(chgblob->Challenge, conn->ntlmssp.cryptkey, 477 CIFS_CRYPTO_KEY_SIZE); 478 479 /* Add Target Information to security buffer */ 480 chgblob->TargetInfoArray.BufferOffset = cpu_to_le32(blob_len); 481 482 target_name = (__u8 *)chgblob + blob_off; 483 memcpy(target_name, name, uni_len); 484 tinfo = (struct target_info *)(target_name + uni_len); 485 486 chgblob->TargetInfoArray.Length = 0; 487 /* Add target info list for NetBIOS/DNS settings */ 488 for (type = NTLMSSP_AV_NB_COMPUTER_NAME; 489 type <= NTLMSSP_AV_DNS_DOMAIN_NAME; type++) { 490 tinfo->Type = cpu_to_le16(type); 491 tinfo->Length = cpu_to_le16(uni_len); 492 memcpy(tinfo->Content, name, uni_len); 493 tinfo = (struct target_info *)((char *)tinfo + 4 + uni_len); 494 target_info_len += 4 + uni_len; 495 } 496 497 /* Add terminator subblock */ 498 tinfo->Type = 0; 499 tinfo->Length = 0; 500 target_info_len += 4; 501 502 chgblob->TargetInfoArray.Length = cpu_to_le16(target_info_len); 503 chgblob->TargetInfoArray.MaximumLength = cpu_to_le16(target_info_len); 504 blob_len += target_info_len; 505 kfree(name); 506 ksmbd_debug(AUTH, "NTLMSSP SecurityBufferLength %d\n", blob_len); 507 return blob_len; 508 } 509 510 #ifdef CONFIG_SMB_SERVER_KERBEROS5 511 int ksmbd_krb5_authenticate(struct ksmbd_session *sess, char *in_blob, 512 int in_len, char *out_blob, int *out_len) 513 { 514 struct ksmbd_spnego_authen_response *resp; 515 struct ksmbd_login_response_ext *resp_ext = NULL; 516 struct ksmbd_user *user = NULL; 517 int retval; 518 519 resp = ksmbd_ipc_spnego_authen_request(in_blob, in_len); 520 if (!resp) { 521 ksmbd_debug(AUTH, "SPNEGO_AUTHEN_REQUEST failure\n"); 522 return -EINVAL; 523 } 524 525 if (!(resp->login_response.status & KSMBD_USER_FLAG_OK)) { 526 ksmbd_debug(AUTH, "krb5 authentication failure\n"); 527 retval = -EPERM; 528 goto out; 529 } 530 531 if (*out_len <= resp->spnego_blob_len) { 532 ksmbd_debug(AUTH, "buf len %d, but blob len %d\n", 533 *out_len, resp->spnego_blob_len); 534 retval = -EINVAL; 535 goto out; 536 } 537 538 if (resp->session_key_len > sizeof(sess->sess_key)) { 539 ksmbd_debug(AUTH, "session key is too long\n"); 540 retval = -EINVAL; 541 goto out; 542 } 543 544 if (resp->login_response.status & KSMBD_USER_FLAG_EXTENSION) 545 resp_ext = ksmbd_ipc_login_request_ext(resp->login_response.account); 546 547 user = ksmbd_alloc_user(&resp->login_response, resp_ext); 548 if (!user) { 549 ksmbd_debug(AUTH, "login failure\n"); 550 retval = -ENOMEM; 551 goto out; 552 } 553 554 if (!sess->user) { 555 /* First successful authentication */ 556 sess->user = user; 557 } else { 558 if (!ksmbd_compare_user(sess->user, user)) { 559 ksmbd_debug(AUTH, "different user tried to reuse session\n"); 560 retval = -EPERM; 561 ksmbd_free_user(user); 562 goto out; 563 } 564 ksmbd_free_user(user); 565 } 566 567 memcpy(sess->sess_key, resp->payload, resp->session_key_len); 568 memcpy(out_blob, resp->payload + resp->session_key_len, 569 resp->spnego_blob_len); 570 *out_len = resp->spnego_blob_len; 571 retval = 0; 572 out: 573 kvfree(resp); 574 return retval; 575 } 576 #else 577 int ksmbd_krb5_authenticate(struct ksmbd_session *sess, char *in_blob, 578 int in_len, char *out_blob, int *out_len) 579 { 580 return -EOPNOTSUPP; 581 } 582 #endif 583 584 /** 585 * ksmbd_sign_smb2_pdu() - function to generate packet signing 586 * @conn: connection 587 * @key: signing key 588 * @iov: buffer iov array 589 * @n_vec: number of iovecs 590 * @sig: signature value generated for client request packet 591 * 592 */ 593 int ksmbd_sign_smb2_pdu(struct ksmbd_conn *conn, char *key, struct kvec *iov, 594 int n_vec, char *sig) 595 { 596 struct ksmbd_crypto_ctx *ctx; 597 int rc, i; 598 599 ctx = ksmbd_crypto_ctx_find_hmacsha256(); 600 if (!ctx) { 601 ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n"); 602 return -ENOMEM; 603 } 604 605 rc = crypto_shash_setkey(CRYPTO_HMACSHA256_TFM(ctx), 606 key, 607 SMB2_NTLMV2_SESSKEY_SIZE); 608 if (rc) 609 goto out; 610 611 rc = crypto_shash_init(CRYPTO_HMACSHA256(ctx)); 612 if (rc) { 613 ksmbd_debug(AUTH, "hmacsha256 init error %d\n", rc); 614 goto out; 615 } 616 617 for (i = 0; i < n_vec; i++) { 618 rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), 619 iov[i].iov_base, 620 iov[i].iov_len); 621 if (rc) { 622 ksmbd_debug(AUTH, "hmacsha256 update error %d\n", rc); 623 goto out; 624 } 625 } 626 627 rc = crypto_shash_final(CRYPTO_HMACSHA256(ctx), sig); 628 if (rc) 629 ksmbd_debug(AUTH, "hmacsha256 generation error %d\n", rc); 630 out: 631 ksmbd_release_crypto_ctx(ctx); 632 return rc; 633 } 634 635 /** 636 * ksmbd_sign_smb3_pdu() - function to generate packet signing 637 * @conn: connection 638 * @key: signing key 639 * @iov: buffer iov array 640 * @n_vec: number of iovecs 641 * @sig: signature value generated for client request packet 642 * 643 */ 644 int ksmbd_sign_smb3_pdu(struct ksmbd_conn *conn, char *key, struct kvec *iov, 645 int n_vec, char *sig) 646 { 647 struct ksmbd_crypto_ctx *ctx; 648 int rc, i; 649 650 ctx = ksmbd_crypto_ctx_find_cmacaes(); 651 if (!ctx) { 652 ksmbd_debug(AUTH, "could not crypto alloc cmac\n"); 653 return -ENOMEM; 654 } 655 656 rc = crypto_shash_setkey(CRYPTO_CMACAES_TFM(ctx), 657 key, 658 SMB2_CMACAES_SIZE); 659 if (rc) 660 goto out; 661 662 rc = crypto_shash_init(CRYPTO_CMACAES(ctx)); 663 if (rc) { 664 ksmbd_debug(AUTH, "cmaces init error %d\n", rc); 665 goto out; 666 } 667 668 for (i = 0; i < n_vec; i++) { 669 rc = crypto_shash_update(CRYPTO_CMACAES(ctx), 670 iov[i].iov_base, 671 iov[i].iov_len); 672 if (rc) { 673 ksmbd_debug(AUTH, "cmaces update error %d\n", rc); 674 goto out; 675 } 676 } 677 678 rc = crypto_shash_final(CRYPTO_CMACAES(ctx), sig); 679 if (rc) 680 ksmbd_debug(AUTH, "cmaces generation error %d\n", rc); 681 out: 682 ksmbd_release_crypto_ctx(ctx); 683 return rc; 684 } 685 686 struct derivation { 687 struct kvec label; 688 struct kvec context; 689 bool binding; 690 }; 691 692 static int generate_key(struct ksmbd_conn *conn, struct ksmbd_session *sess, 693 struct kvec label, struct kvec context, __u8 *key, 694 unsigned int key_size) 695 { 696 unsigned char zero = 0x0; 697 __u8 i[4] = {0, 0, 0, 1}; 698 __u8 L128[4] = {0, 0, 0, 128}; 699 __u8 L256[4] = {0, 0, 1, 0}; 700 int rc; 701 unsigned char prfhash[SMB2_HMACSHA256_SIZE]; 702 unsigned char *hashptr = prfhash; 703 struct ksmbd_crypto_ctx *ctx; 704 705 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE); 706 memset(key, 0x0, key_size); 707 708 ctx = ksmbd_crypto_ctx_find_hmacsha256(); 709 if (!ctx) { 710 ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n"); 711 return -ENOMEM; 712 } 713 714 rc = crypto_shash_setkey(CRYPTO_HMACSHA256_TFM(ctx), 715 sess->sess_key, 716 SMB2_NTLMV2_SESSKEY_SIZE); 717 if (rc) 718 goto smb3signkey_ret; 719 720 rc = crypto_shash_init(CRYPTO_HMACSHA256(ctx)); 721 if (rc) { 722 ksmbd_debug(AUTH, "hmacsha256 init error %d\n", rc); 723 goto smb3signkey_ret; 724 } 725 726 rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), i, 4); 727 if (rc) { 728 ksmbd_debug(AUTH, "could not update with n\n"); 729 goto smb3signkey_ret; 730 } 731 732 rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), 733 label.iov_base, 734 label.iov_len); 735 if (rc) { 736 ksmbd_debug(AUTH, "could not update with label\n"); 737 goto smb3signkey_ret; 738 } 739 740 rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), &zero, 1); 741 if (rc) { 742 ksmbd_debug(AUTH, "could not update with zero\n"); 743 goto smb3signkey_ret; 744 } 745 746 rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), 747 context.iov_base, 748 context.iov_len); 749 if (rc) { 750 ksmbd_debug(AUTH, "could not update with context\n"); 751 goto smb3signkey_ret; 752 } 753 754 if (key_size == SMB3_ENC_DEC_KEY_SIZE && 755 (conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM || 756 conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)) 757 rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), L256, 4); 758 else 759 rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), L128, 4); 760 if (rc) { 761 ksmbd_debug(AUTH, "could not update with L\n"); 762 goto smb3signkey_ret; 763 } 764 765 rc = crypto_shash_final(CRYPTO_HMACSHA256(ctx), hashptr); 766 if (rc) { 767 ksmbd_debug(AUTH, "Could not generate hmacmd5 hash error %d\n", 768 rc); 769 goto smb3signkey_ret; 770 } 771 772 memcpy(key, hashptr, key_size); 773 774 smb3signkey_ret: 775 ksmbd_release_crypto_ctx(ctx); 776 return rc; 777 } 778 779 static int generate_smb3signingkey(struct ksmbd_session *sess, 780 struct ksmbd_conn *conn, 781 const struct derivation *signing) 782 { 783 int rc; 784 struct channel *chann; 785 char *key; 786 787 chann = lookup_chann_list(sess, conn); 788 if (!chann) 789 return 0; 790 791 if (conn->dialect >= SMB30_PROT_ID && signing->binding) 792 key = chann->smb3signingkey; 793 else 794 key = sess->smb3signingkey; 795 796 rc = generate_key(conn, sess, signing->label, signing->context, key, 797 SMB3_SIGN_KEY_SIZE); 798 if (rc) 799 return rc; 800 801 if (!(conn->dialect >= SMB30_PROT_ID && signing->binding)) 802 memcpy(chann->smb3signingkey, key, SMB3_SIGN_KEY_SIZE); 803 804 ksmbd_debug(AUTH, "dumping generated AES signing keys\n"); 805 ksmbd_debug(AUTH, "Session Id %llu\n", sess->id); 806 ksmbd_debug(AUTH, "Session Key %*ph\n", 807 SMB2_NTLMV2_SESSKEY_SIZE, sess->sess_key); 808 ksmbd_debug(AUTH, "Signing Key %*ph\n", 809 SMB3_SIGN_KEY_SIZE, key); 810 return 0; 811 } 812 813 int ksmbd_gen_smb30_signingkey(struct ksmbd_session *sess, 814 struct ksmbd_conn *conn) 815 { 816 struct derivation d; 817 818 d.label.iov_base = "SMB2AESCMAC"; 819 d.label.iov_len = 12; 820 d.context.iov_base = "SmbSign"; 821 d.context.iov_len = 8; 822 d.binding = conn->binding; 823 824 return generate_smb3signingkey(sess, conn, &d); 825 } 826 827 int ksmbd_gen_smb311_signingkey(struct ksmbd_session *sess, 828 struct ksmbd_conn *conn) 829 { 830 struct derivation d; 831 832 d.label.iov_base = "SMBSigningKey"; 833 d.label.iov_len = 14; 834 if (conn->binding) { 835 struct preauth_session *preauth_sess; 836 837 preauth_sess = ksmbd_preauth_session_lookup(conn, sess->id); 838 if (!preauth_sess) 839 return -ENOENT; 840 d.context.iov_base = preauth_sess->Preauth_HashValue; 841 } else { 842 d.context.iov_base = sess->Preauth_HashValue; 843 } 844 d.context.iov_len = 64; 845 d.binding = conn->binding; 846 847 return generate_smb3signingkey(sess, conn, &d); 848 } 849 850 struct derivation_twin { 851 struct derivation encryption; 852 struct derivation decryption; 853 }; 854 855 static int generate_smb3encryptionkey(struct ksmbd_conn *conn, 856 struct ksmbd_session *sess, 857 const struct derivation_twin *ptwin) 858 { 859 int rc; 860 861 rc = generate_key(conn, sess, ptwin->encryption.label, 862 ptwin->encryption.context, sess->smb3encryptionkey, 863 SMB3_ENC_DEC_KEY_SIZE); 864 if (rc) 865 return rc; 866 867 rc = generate_key(conn, sess, ptwin->decryption.label, 868 ptwin->decryption.context, 869 sess->smb3decryptionkey, SMB3_ENC_DEC_KEY_SIZE); 870 if (rc) 871 return rc; 872 873 ksmbd_debug(AUTH, "dumping generated AES encryption keys\n"); 874 ksmbd_debug(AUTH, "Cipher type %d\n", conn->cipher_type); 875 ksmbd_debug(AUTH, "Session Id %llu\n", sess->id); 876 ksmbd_debug(AUTH, "Session Key %*ph\n", 877 SMB2_NTLMV2_SESSKEY_SIZE, sess->sess_key); 878 if (conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM || 879 conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) { 880 ksmbd_debug(AUTH, "ServerIn Key %*ph\n", 881 SMB3_GCM256_CRYPTKEY_SIZE, sess->smb3encryptionkey); 882 ksmbd_debug(AUTH, "ServerOut Key %*ph\n", 883 SMB3_GCM256_CRYPTKEY_SIZE, sess->smb3decryptionkey); 884 } else { 885 ksmbd_debug(AUTH, "ServerIn Key %*ph\n", 886 SMB3_GCM128_CRYPTKEY_SIZE, sess->smb3encryptionkey); 887 ksmbd_debug(AUTH, "ServerOut Key %*ph\n", 888 SMB3_GCM128_CRYPTKEY_SIZE, sess->smb3decryptionkey); 889 } 890 return 0; 891 } 892 893 int ksmbd_gen_smb30_encryptionkey(struct ksmbd_conn *conn, 894 struct ksmbd_session *sess) 895 { 896 struct derivation_twin twin; 897 struct derivation *d; 898 899 d = &twin.encryption; 900 d->label.iov_base = "SMB2AESCCM"; 901 d->label.iov_len = 11; 902 d->context.iov_base = "ServerOut"; 903 d->context.iov_len = 10; 904 905 d = &twin.decryption; 906 d->label.iov_base = "SMB2AESCCM"; 907 d->label.iov_len = 11; 908 d->context.iov_base = "ServerIn "; 909 d->context.iov_len = 10; 910 911 return generate_smb3encryptionkey(conn, sess, &twin); 912 } 913 914 int ksmbd_gen_smb311_encryptionkey(struct ksmbd_conn *conn, 915 struct ksmbd_session *sess) 916 { 917 struct derivation_twin twin; 918 struct derivation *d; 919 920 d = &twin.encryption; 921 d->label.iov_base = "SMBS2CCipherKey"; 922 d->label.iov_len = 16; 923 d->context.iov_base = sess->Preauth_HashValue; 924 d->context.iov_len = 64; 925 926 d = &twin.decryption; 927 d->label.iov_base = "SMBC2SCipherKey"; 928 d->label.iov_len = 16; 929 d->context.iov_base = sess->Preauth_HashValue; 930 d->context.iov_len = 64; 931 932 return generate_smb3encryptionkey(conn, sess, &twin); 933 } 934 935 int ksmbd_gen_preauth_integrity_hash(struct ksmbd_conn *conn, char *buf, 936 __u8 *pi_hash) 937 { 938 int rc; 939 struct smb2_hdr *rcv_hdr = smb2_get_msg(buf); 940 char *all_bytes_msg = (char *)&rcv_hdr->ProtocolId; 941 int msg_size = get_rfc1002_len(buf); 942 struct ksmbd_crypto_ctx *ctx = NULL; 943 944 if (conn->preauth_info->Preauth_HashId != 945 SMB2_PREAUTH_INTEGRITY_SHA512) 946 return -EINVAL; 947 948 ctx = ksmbd_crypto_ctx_find_sha512(); 949 if (!ctx) { 950 ksmbd_debug(AUTH, "could not alloc sha512\n"); 951 return -ENOMEM; 952 } 953 954 rc = crypto_shash_init(CRYPTO_SHA512(ctx)); 955 if (rc) { 956 ksmbd_debug(AUTH, "could not init shashn"); 957 goto out; 958 } 959 960 rc = crypto_shash_update(CRYPTO_SHA512(ctx), pi_hash, 64); 961 if (rc) { 962 ksmbd_debug(AUTH, "could not update with n\n"); 963 goto out; 964 } 965 966 rc = crypto_shash_update(CRYPTO_SHA512(ctx), all_bytes_msg, msg_size); 967 if (rc) { 968 ksmbd_debug(AUTH, "could not update with n\n"); 969 goto out; 970 } 971 972 rc = crypto_shash_final(CRYPTO_SHA512(ctx), pi_hash); 973 if (rc) { 974 ksmbd_debug(AUTH, "Could not generate hash err : %d\n", rc); 975 goto out; 976 } 977 out: 978 ksmbd_release_crypto_ctx(ctx); 979 return rc; 980 } 981 982 static int ksmbd_get_encryption_key(struct ksmbd_work *work, __u64 ses_id, 983 int enc, u8 *key) 984 { 985 struct ksmbd_session *sess; 986 u8 *ses_enc_key; 987 988 if (enc) 989 sess = work->sess; 990 else 991 sess = ksmbd_session_lookup_all(work->conn, ses_id); 992 if (!sess) 993 return -EINVAL; 994 995 ses_enc_key = enc ? sess->smb3encryptionkey : 996 sess->smb3decryptionkey; 997 memcpy(key, ses_enc_key, SMB3_ENC_DEC_KEY_SIZE); 998 if (!enc) 999 ksmbd_user_session_put(sess); 1000 1001 return 0; 1002 } 1003 1004 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf, 1005 unsigned int buflen) 1006 { 1007 void *addr; 1008 1009 if (is_vmalloc_addr(buf)) 1010 addr = vmalloc_to_page(buf); 1011 else 1012 addr = virt_to_page(buf); 1013 sg_set_page(sg, addr, buflen, offset_in_page(buf)); 1014 } 1015 1016 static struct scatterlist *ksmbd_init_sg(struct kvec *iov, unsigned int nvec, 1017 u8 *sign) 1018 { 1019 struct scatterlist *sg; 1020 unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20; 1021 int i, *nr_entries, total_entries = 0, sg_idx = 0; 1022 1023 if (!nvec) 1024 return NULL; 1025 1026 nr_entries = kcalloc(nvec, sizeof(int), KSMBD_DEFAULT_GFP); 1027 if (!nr_entries) 1028 return NULL; 1029 1030 for (i = 0; i < nvec - 1; i++) { 1031 unsigned long kaddr = (unsigned long)iov[i + 1].iov_base; 1032 1033 if (is_vmalloc_addr(iov[i + 1].iov_base)) { 1034 nr_entries[i] = ((kaddr + iov[i + 1].iov_len + 1035 PAGE_SIZE - 1) >> PAGE_SHIFT) - 1036 (kaddr >> PAGE_SHIFT); 1037 } else { 1038 nr_entries[i]++; 1039 } 1040 total_entries += nr_entries[i]; 1041 } 1042 1043 /* Add two entries for transform header and signature */ 1044 total_entries += 2; 1045 1046 sg = kmalloc_array(total_entries, sizeof(struct scatterlist), 1047 KSMBD_DEFAULT_GFP); 1048 if (!sg) { 1049 kfree(nr_entries); 1050 return NULL; 1051 } 1052 1053 sg_init_table(sg, total_entries); 1054 smb2_sg_set_buf(&sg[sg_idx++], iov[0].iov_base + 24, assoc_data_len); 1055 for (i = 0; i < nvec - 1; i++) { 1056 void *data = iov[i + 1].iov_base; 1057 int len = iov[i + 1].iov_len; 1058 1059 if (is_vmalloc_addr(data)) { 1060 int j, offset = offset_in_page(data); 1061 1062 for (j = 0; j < nr_entries[i]; j++) { 1063 unsigned int bytes = PAGE_SIZE - offset; 1064 1065 if (!len) 1066 break; 1067 1068 if (bytes > len) 1069 bytes = len; 1070 1071 sg_set_page(&sg[sg_idx++], 1072 vmalloc_to_page(data), bytes, 1073 offset_in_page(data)); 1074 1075 data += bytes; 1076 len -= bytes; 1077 offset = 0; 1078 } 1079 } else { 1080 sg_set_page(&sg[sg_idx++], virt_to_page(data), len, 1081 offset_in_page(data)); 1082 } 1083 } 1084 smb2_sg_set_buf(&sg[sg_idx], sign, SMB2_SIGNATURE_SIZE); 1085 kfree(nr_entries); 1086 return sg; 1087 } 1088 1089 int ksmbd_crypt_message(struct ksmbd_work *work, struct kvec *iov, 1090 unsigned int nvec, int enc) 1091 { 1092 struct ksmbd_conn *conn = work->conn; 1093 struct smb2_transform_hdr *tr_hdr = smb2_get_msg(iov[0].iov_base); 1094 unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20; 1095 int rc; 1096 struct scatterlist *sg; 1097 u8 sign[SMB2_SIGNATURE_SIZE] = {}; 1098 u8 key[SMB3_ENC_DEC_KEY_SIZE]; 1099 struct aead_request *req; 1100 char *iv; 1101 unsigned int iv_len; 1102 struct crypto_aead *tfm; 1103 unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize); 1104 struct ksmbd_crypto_ctx *ctx; 1105 1106 rc = ksmbd_get_encryption_key(work, 1107 le64_to_cpu(tr_hdr->SessionId), 1108 enc, 1109 key); 1110 if (rc) { 1111 pr_err("Could not get %scryption key\n", enc ? "en" : "de"); 1112 return rc; 1113 } 1114 1115 if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM || 1116 conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) 1117 ctx = ksmbd_crypto_ctx_find_gcm(); 1118 else 1119 ctx = ksmbd_crypto_ctx_find_ccm(); 1120 if (!ctx) { 1121 pr_err("crypto alloc failed\n"); 1122 return -ENOMEM; 1123 } 1124 1125 if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM || 1126 conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) 1127 tfm = CRYPTO_GCM(ctx); 1128 else 1129 tfm = CRYPTO_CCM(ctx); 1130 1131 if (conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM || 1132 conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) 1133 rc = crypto_aead_setkey(tfm, key, SMB3_GCM256_CRYPTKEY_SIZE); 1134 else 1135 rc = crypto_aead_setkey(tfm, key, SMB3_GCM128_CRYPTKEY_SIZE); 1136 if (rc) { 1137 pr_err("Failed to set aead key %d\n", rc); 1138 goto free_ctx; 1139 } 1140 1141 rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE); 1142 if (rc) { 1143 pr_err("Failed to set authsize %d\n", rc); 1144 goto free_ctx; 1145 } 1146 1147 req = aead_request_alloc(tfm, KSMBD_DEFAULT_GFP); 1148 if (!req) { 1149 rc = -ENOMEM; 1150 goto free_ctx; 1151 } 1152 1153 if (!enc) { 1154 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE); 1155 crypt_len += SMB2_SIGNATURE_SIZE; 1156 } 1157 1158 sg = ksmbd_init_sg(iov, nvec, sign); 1159 if (!sg) { 1160 pr_err("Failed to init sg\n"); 1161 rc = -ENOMEM; 1162 goto free_req; 1163 } 1164 1165 iv_len = crypto_aead_ivsize(tfm); 1166 iv = kzalloc(iv_len, KSMBD_DEFAULT_GFP); 1167 if (!iv) { 1168 rc = -ENOMEM; 1169 goto free_sg; 1170 } 1171 1172 if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM || 1173 conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) { 1174 memcpy(iv, (char *)tr_hdr->Nonce, SMB3_AES_GCM_NONCE); 1175 } else { 1176 iv[0] = 3; 1177 memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES_CCM_NONCE); 1178 } 1179 1180 aead_request_set_crypt(req, sg, sg, crypt_len, iv); 1181 aead_request_set_ad(req, assoc_data_len); 1182 aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL); 1183 1184 if (enc) 1185 rc = crypto_aead_encrypt(req); 1186 else 1187 rc = crypto_aead_decrypt(req); 1188 if (rc) 1189 goto free_iv; 1190 1191 if (enc) 1192 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE); 1193 1194 free_iv: 1195 kfree(iv); 1196 free_sg: 1197 kfree(sg); 1198 free_req: 1199 aead_request_free(req); 1200 free_ctx: 1201 ksmbd_release_crypto_ctx(ctx); 1202 return rc; 1203 } 1204