| 1 | /* |
| 2 | * fs/cifs/sess.c |
| 3 | * |
| 4 | * SMB/CIFS session setup handling routines |
| 5 | * |
| 6 | * Copyright (c) International Business Machines Corp., 2006, 2009 |
| 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Lesser General Public License as published |
| 11 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 17 | * the GNU Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public License |
| 20 | * along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include "cifspdu.h" |
| 25 | #include "cifsglob.h" |
| 26 | #include "cifsproto.h" |
| 27 | #include "cifs_unicode.h" |
| 28 | #include "cifs_debug.h" |
| 29 | #include "ntlmssp.h" |
| 30 | #include "nterr.h" |
| 31 | #include <linux/utsname.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include "cifs_spnego.h" |
| 34 | |
| 35 | static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB) |
| 36 | { |
| 37 | __u32 capabilities = 0; |
| 38 | |
| 39 | /* init fields common to all four types of SessSetup */ |
| 40 | /* Note that offsets for first seven fields in req struct are same */ |
| 41 | /* in CIFS Specs so does not matter which of 3 forms of struct */ |
| 42 | /* that we use in next few lines */ |
| 43 | /* Note that header is initialized to zero in header_assemble */ |
| 44 | pSMB->req.AndXCommand = 0xFF; |
| 45 | pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, |
| 46 | CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4, |
| 47 | USHRT_MAX)); |
| 48 | pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq); |
| 49 | pSMB->req.VcNumber = cpu_to_le16(1); |
| 50 | |
| 51 | /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ |
| 52 | |
| 53 | /* BB verify whether signing required on neg or just on auth frame |
| 54 | (and NTLM case) */ |
| 55 | |
| 56 | capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | |
| 57 | CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; |
| 58 | |
| 59 | if (ses->server->sign) |
| 60 | pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
| 61 | |
| 62 | if (ses->capabilities & CAP_UNICODE) { |
| 63 | pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; |
| 64 | capabilities |= CAP_UNICODE; |
| 65 | } |
| 66 | if (ses->capabilities & CAP_STATUS32) { |
| 67 | pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; |
| 68 | capabilities |= CAP_STATUS32; |
| 69 | } |
| 70 | if (ses->capabilities & CAP_DFS) { |
| 71 | pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; |
| 72 | capabilities |= CAP_DFS; |
| 73 | } |
| 74 | if (ses->capabilities & CAP_UNIX) |
| 75 | capabilities |= CAP_UNIX; |
| 76 | |
| 77 | return capabilities; |
| 78 | } |
| 79 | |
| 80 | static void |
| 81 | unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) |
| 82 | { |
| 83 | char *bcc_ptr = *pbcc_area; |
| 84 | int bytes_ret = 0; |
| 85 | |
| 86 | /* Copy OS version */ |
| 87 | bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32, |
| 88 | nls_cp); |
| 89 | bcc_ptr += 2 * bytes_ret; |
| 90 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release, |
| 91 | 32, nls_cp); |
| 92 | bcc_ptr += 2 * bytes_ret; |
| 93 | bcc_ptr += 2; /* trailing null */ |
| 94 | |
| 95 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, |
| 96 | 32, nls_cp); |
| 97 | bcc_ptr += 2 * bytes_ret; |
| 98 | bcc_ptr += 2; /* trailing null */ |
| 99 | |
| 100 | *pbcc_area = bcc_ptr; |
| 101 | } |
| 102 | |
| 103 | static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, |
| 104 | const struct nls_table *nls_cp) |
| 105 | { |
| 106 | char *bcc_ptr = *pbcc_area; |
| 107 | int bytes_ret = 0; |
| 108 | |
| 109 | /* copy domain */ |
| 110 | if (ses->domainName == NULL) { |
| 111 | /* Sending null domain better than using a bogus domain name (as |
| 112 | we did briefly in 2.6.18) since server will use its default */ |
| 113 | *bcc_ptr = 0; |
| 114 | *(bcc_ptr+1) = 0; |
| 115 | bytes_ret = 0; |
| 116 | } else |
| 117 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, |
| 118 | CIFS_MAX_DOMAINNAME_LEN, nls_cp); |
| 119 | bcc_ptr += 2 * bytes_ret; |
| 120 | bcc_ptr += 2; /* account for null terminator */ |
| 121 | |
| 122 | *pbcc_area = bcc_ptr; |
| 123 | } |
| 124 | |
| 125 | |
| 126 | static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, |
| 127 | const struct nls_table *nls_cp) |
| 128 | { |
| 129 | char *bcc_ptr = *pbcc_area; |
| 130 | int bytes_ret = 0; |
| 131 | |
| 132 | /* BB FIXME add check that strings total less |
| 133 | than 335 or will need to send them as arrays */ |
| 134 | |
| 135 | /* unicode strings, must be word aligned before the call */ |
| 136 | /* if ((long) bcc_ptr % 2) { |
| 137 | *bcc_ptr = 0; |
| 138 | bcc_ptr++; |
| 139 | } */ |
| 140 | /* copy user */ |
| 141 | if (ses->user_name == NULL) { |
| 142 | /* null user mount */ |
| 143 | *bcc_ptr = 0; |
| 144 | *(bcc_ptr+1) = 0; |
| 145 | } else { |
| 146 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, |
| 147 | CIFS_MAX_USERNAME_LEN, nls_cp); |
| 148 | } |
| 149 | bcc_ptr += 2 * bytes_ret; |
| 150 | bcc_ptr += 2; /* account for null termination */ |
| 151 | |
| 152 | unicode_domain_string(&bcc_ptr, ses, nls_cp); |
| 153 | unicode_oslm_strings(&bcc_ptr, nls_cp); |
| 154 | |
| 155 | *pbcc_area = bcc_ptr; |
| 156 | } |
| 157 | |
| 158 | static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, |
| 159 | const struct nls_table *nls_cp) |
| 160 | { |
| 161 | char *bcc_ptr = *pbcc_area; |
| 162 | |
| 163 | /* copy user */ |
| 164 | /* BB what about null user mounts - check that we do this BB */ |
| 165 | /* copy user */ |
| 166 | if (ses->user_name != NULL) { |
| 167 | strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); |
| 168 | bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); |
| 169 | } |
| 170 | /* else null user mount */ |
| 171 | *bcc_ptr = 0; |
| 172 | bcc_ptr++; /* account for null termination */ |
| 173 | |
| 174 | /* copy domain */ |
| 175 | if (ses->domainName != NULL) { |
| 176 | strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); |
| 177 | bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); |
| 178 | } /* else we will send a null domain name |
| 179 | so the server will default to its own domain */ |
| 180 | *bcc_ptr = 0; |
| 181 | bcc_ptr++; |
| 182 | |
| 183 | /* BB check for overflow here */ |
| 184 | |
| 185 | strcpy(bcc_ptr, "Linux version "); |
| 186 | bcc_ptr += strlen("Linux version "); |
| 187 | strcpy(bcc_ptr, init_utsname()->release); |
| 188 | bcc_ptr += strlen(init_utsname()->release) + 1; |
| 189 | |
| 190 | strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); |
| 191 | bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; |
| 192 | |
| 193 | *pbcc_area = bcc_ptr; |
| 194 | } |
| 195 | |
| 196 | static void |
| 197 | decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses, |
| 198 | const struct nls_table *nls_cp) |
| 199 | { |
| 200 | int len; |
| 201 | char *data = *pbcc_area; |
| 202 | |
| 203 | cifs_dbg(FYI, "bleft %d\n", bleft); |
| 204 | |
| 205 | kfree(ses->serverOS); |
| 206 | ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
| 207 | cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS); |
| 208 | len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; |
| 209 | data += len; |
| 210 | bleft -= len; |
| 211 | if (bleft <= 0) |
| 212 | return; |
| 213 | |
| 214 | kfree(ses->serverNOS); |
| 215 | ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
| 216 | cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS); |
| 217 | len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; |
| 218 | data += len; |
| 219 | bleft -= len; |
| 220 | if (bleft <= 0) |
| 221 | return; |
| 222 | |
| 223 | kfree(ses->serverDomain); |
| 224 | ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
| 225 | cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain); |
| 226 | |
| 227 | return; |
| 228 | } |
| 229 | |
| 230 | static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft, |
| 231 | struct cifs_ses *ses, |
| 232 | const struct nls_table *nls_cp) |
| 233 | { |
| 234 | int len; |
| 235 | char *bcc_ptr = *pbcc_area; |
| 236 | |
| 237 | cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft); |
| 238 | |
| 239 | len = strnlen(bcc_ptr, bleft); |
| 240 | if (len >= bleft) |
| 241 | return; |
| 242 | |
| 243 | kfree(ses->serverOS); |
| 244 | |
| 245 | ses->serverOS = kzalloc(len + 1, GFP_KERNEL); |
| 246 | if (ses->serverOS) { |
| 247 | strncpy(ses->serverOS, bcc_ptr, len); |
| 248 | if (strncmp(ses->serverOS, "OS/2", 4) == 0) |
| 249 | cifs_dbg(FYI, "OS/2 server\n"); |
| 250 | } |
| 251 | |
| 252 | bcc_ptr += len + 1; |
| 253 | bleft -= len + 1; |
| 254 | |
| 255 | len = strnlen(bcc_ptr, bleft); |
| 256 | if (len >= bleft) |
| 257 | return; |
| 258 | |
| 259 | kfree(ses->serverNOS); |
| 260 | |
| 261 | ses->serverNOS = kzalloc(len + 1, GFP_KERNEL); |
| 262 | if (ses->serverNOS) |
| 263 | strncpy(ses->serverNOS, bcc_ptr, len); |
| 264 | |
| 265 | bcc_ptr += len + 1; |
| 266 | bleft -= len + 1; |
| 267 | |
| 268 | len = strnlen(bcc_ptr, bleft); |
| 269 | if (len > bleft) |
| 270 | return; |
| 271 | |
| 272 | /* No domain field in LANMAN case. Domain is |
| 273 | returned by old servers in the SMB negprot response */ |
| 274 | /* BB For newer servers which do not support Unicode, |
| 275 | but thus do return domain here we could add parsing |
| 276 | for it later, but it is not very important */ |
| 277 | cifs_dbg(FYI, "ascii: bytes left %d\n", bleft); |
| 278 | } |
| 279 | |
| 280 | int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, |
| 281 | struct cifs_ses *ses) |
| 282 | { |
| 283 | unsigned int tioffset; /* challenge message target info area */ |
| 284 | unsigned int tilen; /* challenge message target info area length */ |
| 285 | |
| 286 | CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; |
| 287 | |
| 288 | if (blob_len < sizeof(CHALLENGE_MESSAGE)) { |
| 289 | cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len); |
| 290 | return -EINVAL; |
| 291 | } |
| 292 | |
| 293 | if (memcmp(pblob->Signature, "NTLMSSP", 8)) { |
| 294 | cifs_dbg(VFS, "blob signature incorrect %s\n", |
| 295 | pblob->Signature); |
| 296 | return -EINVAL; |
| 297 | } |
| 298 | if (pblob->MessageType != NtLmChallenge) { |
| 299 | cifs_dbg(VFS, "Incorrect message type %d\n", |
| 300 | pblob->MessageType); |
| 301 | return -EINVAL; |
| 302 | } |
| 303 | |
| 304 | memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); |
| 305 | /* BB we could decode pblob->NegotiateFlags; some may be useful */ |
| 306 | /* In particular we can examine sign flags */ |
| 307 | /* BB spec says that if AvId field of MsvAvTimestamp is populated then |
| 308 | we must set the MIC field of the AUTHENTICATE_MESSAGE */ |
| 309 | ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags); |
| 310 | tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); |
| 311 | tilen = le16_to_cpu(pblob->TargetInfoArray.Length); |
| 312 | if (tioffset > blob_len || tioffset + tilen > blob_len) { |
| 313 | cifs_dbg(VFS, "tioffset + tilen too high %u + %u", |
| 314 | tioffset, tilen); |
| 315 | return -EINVAL; |
| 316 | } |
| 317 | if (tilen) { |
| 318 | ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen, |
| 319 | GFP_KERNEL); |
| 320 | if (!ses->auth_key.response) { |
| 321 | cifs_dbg(VFS, "Challenge target info alloc failure"); |
| 322 | return -ENOMEM; |
| 323 | } |
| 324 | ses->auth_key.len = tilen; |
| 325 | } |
| 326 | |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | /* BB Move to ntlmssp.c eventually */ |
| 331 | |
| 332 | /* We do not malloc the blob, it is passed in pbuffer, because |
| 333 | it is fixed size, and small, making this approach cleaner */ |
| 334 | void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, |
| 335 | struct cifs_ses *ses) |
| 336 | { |
| 337 | NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer; |
| 338 | __u32 flags; |
| 339 | |
| 340 | memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); |
| 341 | memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); |
| 342 | sec_blob->MessageType = NtLmNegotiate; |
| 343 | |
| 344 | /* BB is NTLMV2 session security format easier to use here? */ |
| 345 | flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | |
| 346 | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | |
| 347 | NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; |
| 348 | if (ses->server->sign) { |
| 349 | flags |= NTLMSSP_NEGOTIATE_SIGN; |
| 350 | if (!ses->server->session_estab || |
| 351 | ses->ntlmssp->sesskey_per_smbsess) |
| 352 | flags |= NTLMSSP_NEGOTIATE_KEY_XCH; |
| 353 | } |
| 354 | |
| 355 | sec_blob->NegotiateFlags = cpu_to_le32(flags); |
| 356 | |
| 357 | sec_blob->WorkstationName.BufferOffset = 0; |
| 358 | sec_blob->WorkstationName.Length = 0; |
| 359 | sec_blob->WorkstationName.MaximumLength = 0; |
| 360 | |
| 361 | /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */ |
| 362 | sec_blob->DomainName.BufferOffset = 0; |
| 363 | sec_blob->DomainName.Length = 0; |
| 364 | sec_blob->DomainName.MaximumLength = 0; |
| 365 | } |
| 366 | |
| 367 | static int size_of_ntlmssp_blob(struct cifs_ses *ses) |
| 368 | { |
| 369 | int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len |
| 370 | - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2; |
| 371 | |
| 372 | if (ses->domainName) |
| 373 | sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); |
| 374 | else |
| 375 | sz += 2; |
| 376 | |
| 377 | if (ses->user_name) |
| 378 | sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); |
| 379 | else |
| 380 | sz += 2; |
| 381 | |
| 382 | return sz; |
| 383 | } |
| 384 | |
| 385 | int build_ntlmssp_auth_blob(unsigned char **pbuffer, |
| 386 | u16 *buflen, |
| 387 | struct cifs_ses *ses, |
| 388 | const struct nls_table *nls_cp) |
| 389 | { |
| 390 | int rc; |
| 391 | AUTHENTICATE_MESSAGE *sec_blob; |
| 392 | __u32 flags; |
| 393 | unsigned char *tmp; |
| 394 | |
| 395 | rc = setup_ntlmv2_rsp(ses, nls_cp); |
| 396 | if (rc) { |
| 397 | cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc); |
| 398 | *buflen = 0; |
| 399 | goto setup_ntlmv2_ret; |
| 400 | } |
| 401 | *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL); |
| 402 | sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer; |
| 403 | |
| 404 | memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); |
| 405 | sec_blob->MessageType = NtLmAuthenticate; |
| 406 | |
| 407 | flags = NTLMSSP_NEGOTIATE_56 | |
| 408 | NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO | |
| 409 | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | |
| 410 | NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; |
| 411 | if (ses->server->sign) { |
| 412 | flags |= NTLMSSP_NEGOTIATE_SIGN; |
| 413 | if (!ses->server->session_estab || |
| 414 | ses->ntlmssp->sesskey_per_smbsess) |
| 415 | flags |= NTLMSSP_NEGOTIATE_KEY_XCH; |
| 416 | } |
| 417 | |
| 418 | tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE); |
| 419 | sec_blob->NegotiateFlags = cpu_to_le32(flags); |
| 420 | |
| 421 | sec_blob->LmChallengeResponse.BufferOffset = |
| 422 | cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); |
| 423 | sec_blob->LmChallengeResponse.Length = 0; |
| 424 | sec_blob->LmChallengeResponse.MaximumLength = 0; |
| 425 | |
| 426 | sec_blob->NtChallengeResponse.BufferOffset = |
| 427 | cpu_to_le32(tmp - *pbuffer); |
| 428 | if (ses->user_name != NULL) { |
| 429 | memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
| 430 | ses->auth_key.len - CIFS_SESS_KEY_SIZE); |
| 431 | tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; |
| 432 | |
| 433 | sec_blob->NtChallengeResponse.Length = |
| 434 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); |
| 435 | sec_blob->NtChallengeResponse.MaximumLength = |
| 436 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); |
| 437 | } else { |
| 438 | /* |
| 439 | * don't send an NT Response for anonymous access |
| 440 | */ |
| 441 | sec_blob->NtChallengeResponse.Length = 0; |
| 442 | sec_blob->NtChallengeResponse.MaximumLength = 0; |
| 443 | } |
| 444 | |
| 445 | if (ses->domainName == NULL) { |
| 446 | sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer); |
| 447 | sec_blob->DomainName.Length = 0; |
| 448 | sec_blob->DomainName.MaximumLength = 0; |
| 449 | tmp += 2; |
| 450 | } else { |
| 451 | int len; |
| 452 | len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName, |
| 453 | CIFS_MAX_DOMAINNAME_LEN, nls_cp); |
| 454 | len *= 2; /* unicode is 2 bytes each */ |
| 455 | sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer); |
| 456 | sec_blob->DomainName.Length = cpu_to_le16(len); |
| 457 | sec_blob->DomainName.MaximumLength = cpu_to_le16(len); |
| 458 | tmp += len; |
| 459 | } |
| 460 | |
| 461 | if (ses->user_name == NULL) { |
| 462 | sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer); |
| 463 | sec_blob->UserName.Length = 0; |
| 464 | sec_blob->UserName.MaximumLength = 0; |
| 465 | tmp += 2; |
| 466 | } else { |
| 467 | int len; |
| 468 | len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name, |
| 469 | CIFS_MAX_USERNAME_LEN, nls_cp); |
| 470 | len *= 2; /* unicode is 2 bytes each */ |
| 471 | sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer); |
| 472 | sec_blob->UserName.Length = cpu_to_le16(len); |
| 473 | sec_blob->UserName.MaximumLength = cpu_to_le16(len); |
| 474 | tmp += len; |
| 475 | } |
| 476 | |
| 477 | sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer); |
| 478 | sec_blob->WorkstationName.Length = 0; |
| 479 | sec_blob->WorkstationName.MaximumLength = 0; |
| 480 | tmp += 2; |
| 481 | |
| 482 | if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) || |
| 483 | (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) |
| 484 | && !calc_seckey(ses)) { |
| 485 | memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
| 486 | sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); |
| 487 | sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); |
| 488 | sec_blob->SessionKey.MaximumLength = |
| 489 | cpu_to_le16(CIFS_CPHTXT_SIZE); |
| 490 | tmp += CIFS_CPHTXT_SIZE; |
| 491 | } else { |
| 492 | sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); |
| 493 | sec_blob->SessionKey.Length = 0; |
| 494 | sec_blob->SessionKey.MaximumLength = 0; |
| 495 | } |
| 496 | |
| 497 | *buflen = tmp - *pbuffer; |
| 498 | setup_ntlmv2_ret: |
| 499 | return rc; |
| 500 | } |
| 501 | |
| 502 | enum securityEnum |
| 503 | select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) |
| 504 | { |
| 505 | switch (server->negflavor) { |
| 506 | case CIFS_NEGFLAVOR_EXTENDED: |
| 507 | switch (requested) { |
| 508 | case Kerberos: |
| 509 | case RawNTLMSSP: |
| 510 | return requested; |
| 511 | case Unspecified: |
| 512 | if (server->sec_ntlmssp && |
| 513 | (global_secflags & CIFSSEC_MAY_NTLMSSP)) |
| 514 | return RawNTLMSSP; |
| 515 | if ((server->sec_kerberos || server->sec_mskerberos) && |
| 516 | (global_secflags & CIFSSEC_MAY_KRB5)) |
| 517 | return Kerberos; |
| 518 | /* Fallthrough */ |
| 519 | default: |
| 520 | return Unspecified; |
| 521 | } |
| 522 | case CIFS_NEGFLAVOR_UNENCAP: |
| 523 | switch (requested) { |
| 524 | case NTLM: |
| 525 | case NTLMv2: |
| 526 | return requested; |
| 527 | case Unspecified: |
| 528 | if (global_secflags & CIFSSEC_MAY_NTLMV2) |
| 529 | return NTLMv2; |
| 530 | if (global_secflags & CIFSSEC_MAY_NTLM) |
| 531 | return NTLM; |
| 532 | default: |
| 533 | /* Fallthrough to attempt LANMAN authentication next */ |
| 534 | break; |
| 535 | } |
| 536 | case CIFS_NEGFLAVOR_LANMAN: |
| 537 | switch (requested) { |
| 538 | case LANMAN: |
| 539 | return requested; |
| 540 | case Unspecified: |
| 541 | if (global_secflags & CIFSSEC_MAY_LANMAN) |
| 542 | return LANMAN; |
| 543 | /* Fallthrough */ |
| 544 | default: |
| 545 | return Unspecified; |
| 546 | } |
| 547 | default: |
| 548 | return Unspecified; |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | struct sess_data { |
| 553 | unsigned int xid; |
| 554 | struct cifs_ses *ses; |
| 555 | struct nls_table *nls_cp; |
| 556 | void (*func)(struct sess_data *); |
| 557 | int result; |
| 558 | |
| 559 | /* we will send the SMB in three pieces: |
| 560 | * a fixed length beginning part, an optional |
| 561 | * SPNEGO blob (which can be zero length), and a |
| 562 | * last part which will include the strings |
| 563 | * and rest of bcc area. This allows us to avoid |
| 564 | * a large buffer 17K allocation |
| 565 | */ |
| 566 | int buf0_type; |
| 567 | struct kvec iov[3]; |
| 568 | }; |
| 569 | |
| 570 | static int |
| 571 | sess_alloc_buffer(struct sess_data *sess_data, int wct) |
| 572 | { |
| 573 | int rc; |
| 574 | struct cifs_ses *ses = sess_data->ses; |
| 575 | struct smb_hdr *smb_buf; |
| 576 | |
| 577 | rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, |
| 578 | (void **)&smb_buf); |
| 579 | |
| 580 | if (rc) |
| 581 | return rc; |
| 582 | |
| 583 | sess_data->iov[0].iov_base = (char *)smb_buf; |
| 584 | sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; |
| 585 | /* |
| 586 | * This variable will be used to clear the buffer |
| 587 | * allocated above in case of any error in the calling function. |
| 588 | */ |
| 589 | sess_data->buf0_type = CIFS_SMALL_BUFFER; |
| 590 | |
| 591 | /* 2000 big enough to fit max user, domain, NOS name etc. */ |
| 592 | sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL); |
| 593 | if (!sess_data->iov[2].iov_base) { |
| 594 | rc = -ENOMEM; |
| 595 | goto out_free_smb_buf; |
| 596 | } |
| 597 | |
| 598 | return 0; |
| 599 | |
| 600 | out_free_smb_buf: |
| 601 | kfree(smb_buf); |
| 602 | sess_data->iov[0].iov_base = NULL; |
| 603 | sess_data->iov[0].iov_len = 0; |
| 604 | sess_data->buf0_type = CIFS_NO_BUFFER; |
| 605 | return rc; |
| 606 | } |
| 607 | |
| 608 | static void |
| 609 | sess_free_buffer(struct sess_data *sess_data) |
| 610 | { |
| 611 | |
| 612 | free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base); |
| 613 | sess_data->buf0_type = CIFS_NO_BUFFER; |
| 614 | kfree(sess_data->iov[2].iov_base); |
| 615 | } |
| 616 | |
| 617 | static int |
| 618 | sess_establish_session(struct sess_data *sess_data) |
| 619 | { |
| 620 | struct cifs_ses *ses = sess_data->ses; |
| 621 | |
| 622 | mutex_lock(&ses->server->srv_mutex); |
| 623 | if (!ses->server->session_estab) { |
| 624 | if (ses->server->sign) { |
| 625 | ses->server->session_key.response = |
| 626 | kmemdup(ses->auth_key.response, |
| 627 | ses->auth_key.len, GFP_KERNEL); |
| 628 | if (!ses->server->session_key.response) { |
| 629 | mutex_unlock(&ses->server->srv_mutex); |
| 630 | return -ENOMEM; |
| 631 | } |
| 632 | ses->server->session_key.len = |
| 633 | ses->auth_key.len; |
| 634 | } |
| 635 | ses->server->sequence_number = 0x2; |
| 636 | ses->server->session_estab = true; |
| 637 | } |
| 638 | mutex_unlock(&ses->server->srv_mutex); |
| 639 | |
| 640 | cifs_dbg(FYI, "CIFS session established successfully\n"); |
| 641 | spin_lock(&GlobalMid_Lock); |
| 642 | ses->status = CifsGood; |
| 643 | ses->need_reconnect = false; |
| 644 | spin_unlock(&GlobalMid_Lock); |
| 645 | |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | static int |
| 650 | sess_sendreceive(struct sess_data *sess_data) |
| 651 | { |
| 652 | int rc; |
| 653 | struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base; |
| 654 | __u16 count; |
| 655 | |
| 656 | count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len; |
| 657 | smb_buf->smb_buf_length = |
| 658 | cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count); |
| 659 | put_bcc(count, smb_buf); |
| 660 | |
| 661 | rc = SendReceive2(sess_data->xid, sess_data->ses, |
| 662 | sess_data->iov, 3 /* num_iovecs */, |
| 663 | &sess_data->buf0_type, |
| 664 | CIFS_LOG_ERROR); |
| 665 | |
| 666 | return rc; |
| 667 | } |
| 668 | |
| 669 | /* |
| 670 | * LANMAN and plaintext are less secure and off by default. |
| 671 | * So we make this explicitly be turned on in kconfig (in the |
| 672 | * build) and turned on at runtime (changed from the default) |
| 673 | * in proc/fs/cifs or via mount parm. Unfortunately this is |
| 674 | * needed for old Win (e.g. Win95), some obscure NAS and OS/2 |
| 675 | */ |
| 676 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
| 677 | static void |
| 678 | sess_auth_lanman(struct sess_data *sess_data) |
| 679 | { |
| 680 | int rc = 0; |
| 681 | struct smb_hdr *smb_buf; |
| 682 | SESSION_SETUP_ANDX *pSMB; |
| 683 | char *bcc_ptr; |
| 684 | struct cifs_ses *ses = sess_data->ses; |
| 685 | char lnm_session_key[CIFS_AUTH_RESP_SIZE]; |
| 686 | __u32 capabilities; |
| 687 | __u16 bytes_remaining; |
| 688 | |
| 689 | /* lanman 2 style sessionsetup */ |
| 690 | /* wct = 10 */ |
| 691 | rc = sess_alloc_buffer(sess_data, 10); |
| 692 | if (rc) |
| 693 | goto out; |
| 694 | |
| 695 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 696 | bcc_ptr = sess_data->iov[2].iov_base; |
| 697 | capabilities = cifs_ssetup_hdr(ses, pSMB); |
| 698 | |
| 699 | pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE; |
| 700 | |
| 701 | if (ses->user_name != NULL) { |
| 702 | /* no capabilities flags in old lanman negotiation */ |
| 703 | pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE); |
| 704 | |
| 705 | /* Calculate hash with password and copy into bcc_ptr. |
| 706 | * Encryption Key (stored as in cryptkey) gets used if the |
| 707 | * security mode bit in Negottiate Protocol response states |
| 708 | * to use challenge/response method (i.e. Password bit is 1). |
| 709 | */ |
| 710 | rc = calc_lanman_hash(ses->password, ses->server->cryptkey, |
| 711 | ses->server->sec_mode & SECMODE_PW_ENCRYPT ? |
| 712 | true : false, lnm_session_key); |
| 713 | if (rc) |
| 714 | goto out; |
| 715 | |
| 716 | memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE); |
| 717 | bcc_ptr += CIFS_AUTH_RESP_SIZE; |
| 718 | } else { |
| 719 | pSMB->old_req.PasswordLength = 0; |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * can not sign if LANMAN negotiated so no need |
| 724 | * to calculate signing key? but what if server |
| 725 | * changed to do higher than lanman dialect and |
| 726 | * we reconnected would we ever calc signing_key? |
| 727 | */ |
| 728 | |
| 729 | cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n"); |
| 730 | /* Unicode not allowed for LANMAN dialects */ |
| 731 | ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); |
| 732 | |
| 733 | sess_data->iov[2].iov_len = (long) bcc_ptr - |
| 734 | (long) sess_data->iov[2].iov_base; |
| 735 | |
| 736 | rc = sess_sendreceive(sess_data); |
| 737 | if (rc) |
| 738 | goto out; |
| 739 | |
| 740 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 741 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; |
| 742 | |
| 743 | /* lanman response has a word count of 3 */ |
| 744 | if (smb_buf->WordCount != 3) { |
| 745 | rc = -EIO; |
| 746 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); |
| 747 | goto out; |
| 748 | } |
| 749 | |
| 750 | if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) |
| 751 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ |
| 752 | |
| 753 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
| 754 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); |
| 755 | |
| 756 | bytes_remaining = get_bcc(smb_buf); |
| 757 | bcc_ptr = pByteArea(smb_buf); |
| 758 | |
| 759 | /* BB check if Unicode and decode strings */ |
| 760 | if (bytes_remaining == 0) { |
| 761 | /* no string area to decode, do nothing */ |
| 762 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { |
| 763 | /* unicode string area must be word-aligned */ |
| 764 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { |
| 765 | ++bcc_ptr; |
| 766 | --bytes_remaining; |
| 767 | } |
| 768 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 769 | sess_data->nls_cp); |
| 770 | } else { |
| 771 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 772 | sess_data->nls_cp); |
| 773 | } |
| 774 | |
| 775 | rc = sess_establish_session(sess_data); |
| 776 | out: |
| 777 | sess_data->result = rc; |
| 778 | sess_data->func = NULL; |
| 779 | sess_free_buffer(sess_data); |
| 780 | } |
| 781 | |
| 782 | #endif |
| 783 | |
| 784 | static void |
| 785 | sess_auth_ntlm(struct sess_data *sess_data) |
| 786 | { |
| 787 | int rc = 0; |
| 788 | struct smb_hdr *smb_buf; |
| 789 | SESSION_SETUP_ANDX *pSMB; |
| 790 | char *bcc_ptr; |
| 791 | struct cifs_ses *ses = sess_data->ses; |
| 792 | __u32 capabilities; |
| 793 | __u16 bytes_remaining; |
| 794 | |
| 795 | /* old style NTLM sessionsetup */ |
| 796 | /* wct = 13 */ |
| 797 | rc = sess_alloc_buffer(sess_data, 13); |
| 798 | if (rc) |
| 799 | goto out; |
| 800 | |
| 801 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 802 | bcc_ptr = sess_data->iov[2].iov_base; |
| 803 | capabilities = cifs_ssetup_hdr(ses, pSMB); |
| 804 | |
| 805 | pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); |
| 806 | if (ses->user_name != NULL) { |
| 807 | pSMB->req_no_secext.CaseInsensitivePasswordLength = |
| 808 | cpu_to_le16(CIFS_AUTH_RESP_SIZE); |
| 809 | pSMB->req_no_secext.CaseSensitivePasswordLength = |
| 810 | cpu_to_le16(CIFS_AUTH_RESP_SIZE); |
| 811 | |
| 812 | /* calculate ntlm response and session key */ |
| 813 | rc = setup_ntlm_response(ses, sess_data->nls_cp); |
| 814 | if (rc) { |
| 815 | cifs_dbg(VFS, "Error %d during NTLM authentication\n", |
| 816 | rc); |
| 817 | goto out; |
| 818 | } |
| 819 | |
| 820 | /* copy ntlm response */ |
| 821 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
| 822 | CIFS_AUTH_RESP_SIZE); |
| 823 | bcc_ptr += CIFS_AUTH_RESP_SIZE; |
| 824 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
| 825 | CIFS_AUTH_RESP_SIZE); |
| 826 | bcc_ptr += CIFS_AUTH_RESP_SIZE; |
| 827 | } else { |
| 828 | pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; |
| 829 | pSMB->req_no_secext.CaseSensitivePasswordLength = 0; |
| 830 | } |
| 831 | |
| 832 | if (ses->capabilities & CAP_UNICODE) { |
| 833 | /* unicode strings must be word aligned */ |
| 834 | if (sess_data->iov[0].iov_len % 2) { |
| 835 | *bcc_ptr = 0; |
| 836 | bcc_ptr++; |
| 837 | } |
| 838 | unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); |
| 839 | } else { |
| 840 | ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); |
| 841 | } |
| 842 | |
| 843 | |
| 844 | sess_data->iov[2].iov_len = (long) bcc_ptr - |
| 845 | (long) sess_data->iov[2].iov_base; |
| 846 | |
| 847 | rc = sess_sendreceive(sess_data); |
| 848 | if (rc) |
| 849 | goto out; |
| 850 | |
| 851 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 852 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; |
| 853 | |
| 854 | if (smb_buf->WordCount != 3) { |
| 855 | rc = -EIO; |
| 856 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); |
| 857 | goto out; |
| 858 | } |
| 859 | |
| 860 | if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) |
| 861 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ |
| 862 | |
| 863 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
| 864 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); |
| 865 | |
| 866 | bytes_remaining = get_bcc(smb_buf); |
| 867 | bcc_ptr = pByteArea(smb_buf); |
| 868 | |
| 869 | /* BB check if Unicode and decode strings */ |
| 870 | if (bytes_remaining == 0) { |
| 871 | /* no string area to decode, do nothing */ |
| 872 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { |
| 873 | /* unicode string area must be word-aligned */ |
| 874 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { |
| 875 | ++bcc_ptr; |
| 876 | --bytes_remaining; |
| 877 | } |
| 878 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 879 | sess_data->nls_cp); |
| 880 | } else { |
| 881 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 882 | sess_data->nls_cp); |
| 883 | } |
| 884 | |
| 885 | rc = sess_establish_session(sess_data); |
| 886 | out: |
| 887 | sess_data->result = rc; |
| 888 | sess_data->func = NULL; |
| 889 | sess_free_buffer(sess_data); |
| 890 | kfree(ses->auth_key.response); |
| 891 | ses->auth_key.response = NULL; |
| 892 | } |
| 893 | |
| 894 | static void |
| 895 | sess_auth_ntlmv2(struct sess_data *sess_data) |
| 896 | { |
| 897 | int rc = 0; |
| 898 | struct smb_hdr *smb_buf; |
| 899 | SESSION_SETUP_ANDX *pSMB; |
| 900 | char *bcc_ptr; |
| 901 | struct cifs_ses *ses = sess_data->ses; |
| 902 | __u32 capabilities; |
| 903 | __u16 bytes_remaining; |
| 904 | |
| 905 | /* old style NTLM sessionsetup */ |
| 906 | /* wct = 13 */ |
| 907 | rc = sess_alloc_buffer(sess_data, 13); |
| 908 | if (rc) |
| 909 | goto out; |
| 910 | |
| 911 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 912 | bcc_ptr = sess_data->iov[2].iov_base; |
| 913 | capabilities = cifs_ssetup_hdr(ses, pSMB); |
| 914 | |
| 915 | pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); |
| 916 | |
| 917 | /* LM2 password would be here if we supported it */ |
| 918 | pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; |
| 919 | |
| 920 | if (ses->user_name != NULL) { |
| 921 | /* calculate nlmv2 response and session key */ |
| 922 | rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); |
| 923 | if (rc) { |
| 924 | cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); |
| 925 | goto out; |
| 926 | } |
| 927 | |
| 928 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
| 929 | ses->auth_key.len - CIFS_SESS_KEY_SIZE); |
| 930 | bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; |
| 931 | |
| 932 | /* set case sensitive password length after tilen may get |
| 933 | * assigned, tilen is 0 otherwise. |
| 934 | */ |
| 935 | pSMB->req_no_secext.CaseSensitivePasswordLength = |
| 936 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); |
| 937 | } else { |
| 938 | pSMB->req_no_secext.CaseSensitivePasswordLength = 0; |
| 939 | } |
| 940 | |
| 941 | if (ses->capabilities & CAP_UNICODE) { |
| 942 | if (sess_data->iov[0].iov_len % 2) { |
| 943 | *bcc_ptr = 0; |
| 944 | bcc_ptr++; |
| 945 | } |
| 946 | unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); |
| 947 | } else { |
| 948 | ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); |
| 949 | } |
| 950 | |
| 951 | |
| 952 | sess_data->iov[2].iov_len = (long) bcc_ptr - |
| 953 | (long) sess_data->iov[2].iov_base; |
| 954 | |
| 955 | rc = sess_sendreceive(sess_data); |
| 956 | if (rc) |
| 957 | goto out; |
| 958 | |
| 959 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 960 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; |
| 961 | |
| 962 | if (smb_buf->WordCount != 3) { |
| 963 | rc = -EIO; |
| 964 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); |
| 965 | goto out; |
| 966 | } |
| 967 | |
| 968 | if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) |
| 969 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ |
| 970 | |
| 971 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
| 972 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); |
| 973 | |
| 974 | bytes_remaining = get_bcc(smb_buf); |
| 975 | bcc_ptr = pByteArea(smb_buf); |
| 976 | |
| 977 | /* BB check if Unicode and decode strings */ |
| 978 | if (bytes_remaining == 0) { |
| 979 | /* no string area to decode, do nothing */ |
| 980 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { |
| 981 | /* unicode string area must be word-aligned */ |
| 982 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { |
| 983 | ++bcc_ptr; |
| 984 | --bytes_remaining; |
| 985 | } |
| 986 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 987 | sess_data->nls_cp); |
| 988 | } else { |
| 989 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 990 | sess_data->nls_cp); |
| 991 | } |
| 992 | |
| 993 | rc = sess_establish_session(sess_data); |
| 994 | out: |
| 995 | sess_data->result = rc; |
| 996 | sess_data->func = NULL; |
| 997 | sess_free_buffer(sess_data); |
| 998 | kfree(ses->auth_key.response); |
| 999 | ses->auth_key.response = NULL; |
| 1000 | } |
| 1001 | |
| 1002 | #ifdef CONFIG_CIFS_UPCALL |
| 1003 | static void |
| 1004 | sess_auth_kerberos(struct sess_data *sess_data) |
| 1005 | { |
| 1006 | int rc = 0; |
| 1007 | struct smb_hdr *smb_buf; |
| 1008 | SESSION_SETUP_ANDX *pSMB; |
| 1009 | char *bcc_ptr; |
| 1010 | struct cifs_ses *ses = sess_data->ses; |
| 1011 | __u32 capabilities; |
| 1012 | __u16 bytes_remaining; |
| 1013 | struct key *spnego_key = NULL; |
| 1014 | struct cifs_spnego_msg *msg; |
| 1015 | u16 blob_len; |
| 1016 | |
| 1017 | /* extended security */ |
| 1018 | /* wct = 12 */ |
| 1019 | rc = sess_alloc_buffer(sess_data, 12); |
| 1020 | if (rc) |
| 1021 | goto out; |
| 1022 | |
| 1023 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 1024 | bcc_ptr = sess_data->iov[2].iov_base; |
| 1025 | capabilities = cifs_ssetup_hdr(ses, pSMB); |
| 1026 | |
| 1027 | spnego_key = cifs_get_spnego_key(ses); |
| 1028 | if (IS_ERR(spnego_key)) { |
| 1029 | rc = PTR_ERR(spnego_key); |
| 1030 | spnego_key = NULL; |
| 1031 | goto out; |
| 1032 | } |
| 1033 | |
| 1034 | msg = spnego_key->payload.data[0]; |
| 1035 | /* |
| 1036 | * check version field to make sure that cifs.upcall is |
| 1037 | * sending us a response in an expected form |
| 1038 | */ |
| 1039 | if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { |
| 1040 | cifs_dbg(VFS, |
| 1041 | "incorrect version of cifs.upcall (expected %d but got %d)", |
| 1042 | CIFS_SPNEGO_UPCALL_VERSION, msg->version); |
| 1043 | rc = -EKEYREJECTED; |
| 1044 | goto out_put_spnego_key; |
| 1045 | } |
| 1046 | |
| 1047 | ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, |
| 1048 | GFP_KERNEL); |
| 1049 | if (!ses->auth_key.response) { |
| 1050 | cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory", |
| 1051 | msg->sesskey_len); |
| 1052 | rc = -ENOMEM; |
| 1053 | goto out_put_spnego_key; |
| 1054 | } |
| 1055 | ses->auth_key.len = msg->sesskey_len; |
| 1056 | |
| 1057 | pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
| 1058 | capabilities |= CAP_EXTENDED_SECURITY; |
| 1059 | pSMB->req.Capabilities = cpu_to_le32(capabilities); |
| 1060 | sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; |
| 1061 | sess_data->iov[1].iov_len = msg->secblob_len; |
| 1062 | pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len); |
| 1063 | |
| 1064 | if (ses->capabilities & CAP_UNICODE) { |
| 1065 | /* unicode strings must be word aligned */ |
| 1066 | if ((sess_data->iov[0].iov_len |
| 1067 | + sess_data->iov[1].iov_len) % 2) { |
| 1068 | *bcc_ptr = 0; |
| 1069 | bcc_ptr++; |
| 1070 | } |
| 1071 | unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); |
| 1072 | unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp); |
| 1073 | } else { |
| 1074 | /* BB: is this right? */ |
| 1075 | ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); |
| 1076 | } |
| 1077 | |
| 1078 | sess_data->iov[2].iov_len = (long) bcc_ptr - |
| 1079 | (long) sess_data->iov[2].iov_base; |
| 1080 | |
| 1081 | rc = sess_sendreceive(sess_data); |
| 1082 | if (rc) |
| 1083 | goto out_put_spnego_key; |
| 1084 | |
| 1085 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 1086 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; |
| 1087 | |
| 1088 | if (smb_buf->WordCount != 4) { |
| 1089 | rc = -EIO; |
| 1090 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); |
| 1091 | goto out_put_spnego_key; |
| 1092 | } |
| 1093 | |
| 1094 | if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) |
| 1095 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ |
| 1096 | |
| 1097 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
| 1098 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); |
| 1099 | |
| 1100 | bytes_remaining = get_bcc(smb_buf); |
| 1101 | bcc_ptr = pByteArea(smb_buf); |
| 1102 | |
| 1103 | blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); |
| 1104 | if (blob_len > bytes_remaining) { |
| 1105 | cifs_dbg(VFS, "bad security blob length %d\n", |
| 1106 | blob_len); |
| 1107 | rc = -EINVAL; |
| 1108 | goto out_put_spnego_key; |
| 1109 | } |
| 1110 | bcc_ptr += blob_len; |
| 1111 | bytes_remaining -= blob_len; |
| 1112 | |
| 1113 | /* BB check if Unicode and decode strings */ |
| 1114 | if (bytes_remaining == 0) { |
| 1115 | /* no string area to decode, do nothing */ |
| 1116 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { |
| 1117 | /* unicode string area must be word-aligned */ |
| 1118 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { |
| 1119 | ++bcc_ptr; |
| 1120 | --bytes_remaining; |
| 1121 | } |
| 1122 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 1123 | sess_data->nls_cp); |
| 1124 | } else { |
| 1125 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 1126 | sess_data->nls_cp); |
| 1127 | } |
| 1128 | |
| 1129 | rc = sess_establish_session(sess_data); |
| 1130 | out_put_spnego_key: |
| 1131 | key_invalidate(spnego_key); |
| 1132 | key_put(spnego_key); |
| 1133 | out: |
| 1134 | sess_data->result = rc; |
| 1135 | sess_data->func = NULL; |
| 1136 | sess_free_buffer(sess_data); |
| 1137 | kfree(ses->auth_key.response); |
| 1138 | ses->auth_key.response = NULL; |
| 1139 | } |
| 1140 | |
| 1141 | #endif /* ! CONFIG_CIFS_UPCALL */ |
| 1142 | |
| 1143 | /* |
| 1144 | * The required kvec buffers have to be allocated before calling this |
| 1145 | * function. |
| 1146 | */ |
| 1147 | static int |
| 1148 | _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data) |
| 1149 | { |
| 1150 | struct smb_hdr *smb_buf; |
| 1151 | SESSION_SETUP_ANDX *pSMB; |
| 1152 | struct cifs_ses *ses = sess_data->ses; |
| 1153 | __u32 capabilities; |
| 1154 | char *bcc_ptr; |
| 1155 | |
| 1156 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 1157 | smb_buf = (struct smb_hdr *)pSMB; |
| 1158 | |
| 1159 | capabilities = cifs_ssetup_hdr(ses, pSMB); |
| 1160 | if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { |
| 1161 | cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); |
| 1162 | return -ENOSYS; |
| 1163 | } |
| 1164 | |
| 1165 | pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
| 1166 | capabilities |= CAP_EXTENDED_SECURITY; |
| 1167 | pSMB->req.Capabilities |= cpu_to_le32(capabilities); |
| 1168 | |
| 1169 | bcc_ptr = sess_data->iov[2].iov_base; |
| 1170 | /* unicode strings must be word aligned */ |
| 1171 | if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) { |
| 1172 | *bcc_ptr = 0; |
| 1173 | bcc_ptr++; |
| 1174 | } |
| 1175 | unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); |
| 1176 | |
| 1177 | sess_data->iov[2].iov_len = (long) bcc_ptr - |
| 1178 | (long) sess_data->iov[2].iov_base; |
| 1179 | |
| 1180 | return 0; |
| 1181 | } |
| 1182 | |
| 1183 | static void |
| 1184 | sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data); |
| 1185 | |
| 1186 | static void |
| 1187 | sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data) |
| 1188 | { |
| 1189 | int rc; |
| 1190 | struct smb_hdr *smb_buf; |
| 1191 | SESSION_SETUP_ANDX *pSMB; |
| 1192 | struct cifs_ses *ses = sess_data->ses; |
| 1193 | __u16 bytes_remaining; |
| 1194 | char *bcc_ptr; |
| 1195 | u16 blob_len; |
| 1196 | |
| 1197 | cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n"); |
| 1198 | |
| 1199 | /* |
| 1200 | * if memory allocation is successful, caller of this function |
| 1201 | * frees it. |
| 1202 | */ |
| 1203 | ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); |
| 1204 | if (!ses->ntlmssp) { |
| 1205 | rc = -ENOMEM; |
| 1206 | goto out; |
| 1207 | } |
| 1208 | ses->ntlmssp->sesskey_per_smbsess = false; |
| 1209 | |
| 1210 | /* wct = 12 */ |
| 1211 | rc = sess_alloc_buffer(sess_data, 12); |
| 1212 | if (rc) |
| 1213 | goto out; |
| 1214 | |
| 1215 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 1216 | |
| 1217 | /* Build security blob before we assemble the request */ |
| 1218 | build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses); |
| 1219 | sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE); |
| 1220 | sess_data->iov[1].iov_base = pSMB->req.SecurityBlob; |
| 1221 | pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE)); |
| 1222 | |
| 1223 | rc = _sess_auth_rawntlmssp_assemble_req(sess_data); |
| 1224 | if (rc) |
| 1225 | goto out; |
| 1226 | |
| 1227 | rc = sess_sendreceive(sess_data); |
| 1228 | |
| 1229 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 1230 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; |
| 1231 | |
| 1232 | /* If true, rc here is expected and not an error */ |
| 1233 | if (sess_data->buf0_type != CIFS_NO_BUFFER && |
| 1234 | smb_buf->Status.CifsError == |
| 1235 | cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)) |
| 1236 | rc = 0; |
| 1237 | |
| 1238 | if (rc) |
| 1239 | goto out; |
| 1240 | |
| 1241 | cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); |
| 1242 | |
| 1243 | if (smb_buf->WordCount != 4) { |
| 1244 | rc = -EIO; |
| 1245 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); |
| 1246 | goto out; |
| 1247 | } |
| 1248 | |
| 1249 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
| 1250 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); |
| 1251 | |
| 1252 | bytes_remaining = get_bcc(smb_buf); |
| 1253 | bcc_ptr = pByteArea(smb_buf); |
| 1254 | |
| 1255 | blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); |
| 1256 | if (blob_len > bytes_remaining) { |
| 1257 | cifs_dbg(VFS, "bad security blob length %d\n", |
| 1258 | blob_len); |
| 1259 | rc = -EINVAL; |
| 1260 | goto out; |
| 1261 | } |
| 1262 | |
| 1263 | rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); |
| 1264 | out: |
| 1265 | sess_free_buffer(sess_data); |
| 1266 | |
| 1267 | if (!rc) { |
| 1268 | sess_data->func = sess_auth_rawntlmssp_authenticate; |
| 1269 | return; |
| 1270 | } |
| 1271 | |
| 1272 | /* Else error. Cleanup */ |
| 1273 | kfree(ses->auth_key.response); |
| 1274 | ses->auth_key.response = NULL; |
| 1275 | kfree(ses->ntlmssp); |
| 1276 | ses->ntlmssp = NULL; |
| 1277 | |
| 1278 | sess_data->func = NULL; |
| 1279 | sess_data->result = rc; |
| 1280 | } |
| 1281 | |
| 1282 | static void |
| 1283 | sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data) |
| 1284 | { |
| 1285 | int rc; |
| 1286 | struct smb_hdr *smb_buf; |
| 1287 | SESSION_SETUP_ANDX *pSMB; |
| 1288 | struct cifs_ses *ses = sess_data->ses; |
| 1289 | __u16 bytes_remaining; |
| 1290 | char *bcc_ptr; |
| 1291 | unsigned char *ntlmsspblob = NULL; |
| 1292 | u16 blob_len; |
| 1293 | |
| 1294 | cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n"); |
| 1295 | |
| 1296 | /* wct = 12 */ |
| 1297 | rc = sess_alloc_buffer(sess_data, 12); |
| 1298 | if (rc) |
| 1299 | goto out; |
| 1300 | |
| 1301 | /* Build security blob before we assemble the request */ |
| 1302 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 1303 | smb_buf = (struct smb_hdr *)pSMB; |
| 1304 | rc = build_ntlmssp_auth_blob(&ntlmsspblob, |
| 1305 | &blob_len, ses, sess_data->nls_cp); |
| 1306 | if (rc) |
| 1307 | goto out_free_ntlmsspblob; |
| 1308 | sess_data->iov[1].iov_len = blob_len; |
| 1309 | sess_data->iov[1].iov_base = ntlmsspblob; |
| 1310 | pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); |
| 1311 | /* |
| 1312 | * Make sure that we tell the server that we are using |
| 1313 | * the uid that it just gave us back on the response |
| 1314 | * (challenge) |
| 1315 | */ |
| 1316 | smb_buf->Uid = ses->Suid; |
| 1317 | |
| 1318 | rc = _sess_auth_rawntlmssp_assemble_req(sess_data); |
| 1319 | if (rc) |
| 1320 | goto out_free_ntlmsspblob; |
| 1321 | |
| 1322 | rc = sess_sendreceive(sess_data); |
| 1323 | if (rc) |
| 1324 | goto out_free_ntlmsspblob; |
| 1325 | |
| 1326 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; |
| 1327 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; |
| 1328 | if (smb_buf->WordCount != 4) { |
| 1329 | rc = -EIO; |
| 1330 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); |
| 1331 | goto out_free_ntlmsspblob; |
| 1332 | } |
| 1333 | |
| 1334 | if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) |
| 1335 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ |
| 1336 | |
| 1337 | if (ses->Suid != smb_buf->Uid) { |
| 1338 | ses->Suid = smb_buf->Uid; |
| 1339 | cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid); |
| 1340 | } |
| 1341 | |
| 1342 | bytes_remaining = get_bcc(smb_buf); |
| 1343 | bcc_ptr = pByteArea(smb_buf); |
| 1344 | blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); |
| 1345 | if (blob_len > bytes_remaining) { |
| 1346 | cifs_dbg(VFS, "bad security blob length %d\n", |
| 1347 | blob_len); |
| 1348 | rc = -EINVAL; |
| 1349 | goto out_free_ntlmsspblob; |
| 1350 | } |
| 1351 | bcc_ptr += blob_len; |
| 1352 | bytes_remaining -= blob_len; |
| 1353 | |
| 1354 | |
| 1355 | /* BB check if Unicode and decode strings */ |
| 1356 | if (bytes_remaining == 0) { |
| 1357 | /* no string area to decode, do nothing */ |
| 1358 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { |
| 1359 | /* unicode string area must be word-aligned */ |
| 1360 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { |
| 1361 | ++bcc_ptr; |
| 1362 | --bytes_remaining; |
| 1363 | } |
| 1364 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 1365 | sess_data->nls_cp); |
| 1366 | } else { |
| 1367 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, |
| 1368 | sess_data->nls_cp); |
| 1369 | } |
| 1370 | |
| 1371 | out_free_ntlmsspblob: |
| 1372 | kfree(ntlmsspblob); |
| 1373 | out: |
| 1374 | sess_free_buffer(sess_data); |
| 1375 | |
| 1376 | if (!rc) |
| 1377 | rc = sess_establish_session(sess_data); |
| 1378 | |
| 1379 | /* Cleanup */ |
| 1380 | kfree(ses->auth_key.response); |
| 1381 | ses->auth_key.response = NULL; |
| 1382 | kfree(ses->ntlmssp); |
| 1383 | ses->ntlmssp = NULL; |
| 1384 | |
| 1385 | sess_data->func = NULL; |
| 1386 | sess_data->result = rc; |
| 1387 | } |
| 1388 | |
| 1389 | static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data) |
| 1390 | { |
| 1391 | int type; |
| 1392 | |
| 1393 | type = select_sectype(ses->server, ses->sectype); |
| 1394 | cifs_dbg(FYI, "sess setup type %d\n", type); |
| 1395 | if (type == Unspecified) { |
| 1396 | cifs_dbg(VFS, |
| 1397 | "Unable to select appropriate authentication method!"); |
| 1398 | return -EINVAL; |
| 1399 | } |
| 1400 | |
| 1401 | switch (type) { |
| 1402 | case LANMAN: |
| 1403 | /* LANMAN and plaintext are less secure and off by default. |
| 1404 | * So we make this explicitly be turned on in kconfig (in the |
| 1405 | * build) and turned on at runtime (changed from the default) |
| 1406 | * in proc/fs/cifs or via mount parm. Unfortunately this is |
| 1407 | * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */ |
| 1408 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
| 1409 | sess_data->func = sess_auth_lanman; |
| 1410 | break; |
| 1411 | #else |
| 1412 | return -EOPNOTSUPP; |
| 1413 | #endif |
| 1414 | case NTLM: |
| 1415 | sess_data->func = sess_auth_ntlm; |
| 1416 | break; |
| 1417 | case NTLMv2: |
| 1418 | sess_data->func = sess_auth_ntlmv2; |
| 1419 | break; |
| 1420 | case Kerberos: |
| 1421 | #ifdef CONFIG_CIFS_UPCALL |
| 1422 | sess_data->func = sess_auth_kerberos; |
| 1423 | break; |
| 1424 | #else |
| 1425 | cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); |
| 1426 | return -ENOSYS; |
| 1427 | break; |
| 1428 | #endif /* CONFIG_CIFS_UPCALL */ |
| 1429 | case RawNTLMSSP: |
| 1430 | sess_data->func = sess_auth_rawntlmssp_negotiate; |
| 1431 | break; |
| 1432 | default: |
| 1433 | cifs_dbg(VFS, "secType %d not supported!\n", type); |
| 1434 | return -ENOSYS; |
| 1435 | } |
| 1436 | |
| 1437 | return 0; |
| 1438 | } |
| 1439 | |
| 1440 | int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, |
| 1441 | const struct nls_table *nls_cp) |
| 1442 | { |
| 1443 | int rc = 0; |
| 1444 | struct sess_data *sess_data; |
| 1445 | |
| 1446 | if (ses == NULL) { |
| 1447 | WARN(1, "%s: ses == NULL!", __func__); |
| 1448 | return -EINVAL; |
| 1449 | } |
| 1450 | |
| 1451 | sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL); |
| 1452 | if (!sess_data) |
| 1453 | return -ENOMEM; |
| 1454 | |
| 1455 | rc = select_sec(ses, sess_data); |
| 1456 | if (rc) |
| 1457 | goto out; |
| 1458 | |
| 1459 | sess_data->xid = xid; |
| 1460 | sess_data->ses = ses; |
| 1461 | sess_data->buf0_type = CIFS_NO_BUFFER; |
| 1462 | sess_data->nls_cp = (struct nls_table *) nls_cp; |
| 1463 | |
| 1464 | while (sess_data->func) |
| 1465 | sess_data->func(sess_data); |
| 1466 | |
| 1467 | /* Store result before we free sess_data */ |
| 1468 | rc = sess_data->result; |
| 1469 | |
| 1470 | out: |
| 1471 | kfree(sess_data); |
| 1472 | return rc; |
| 1473 | } |