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-rw-r--r--fs/cifs/cifsencrypt.c861
1 files changed, 0 insertions, 861 deletions
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
deleted file mode 100644
index 357bd27a7fd1..000000000000
--- a/fs/cifs/cifsencrypt.c
+++ /dev/null
@@ -1,861 +0,0 @@
-// SPDX-License-Identifier: LGPL-2.1
-/*
- *
- * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
- * for more detailed information
- *
- * Copyright (C) International Business Machines Corp., 2005,2013
- * Author(s): Steve French (sfrench@us.ibm.com)
- *
- */
-
-#include <linux/fs.h>
-#include <linux/slab.h>
-#include "cifspdu.h"
-#include "cifsglob.h"
-#include "cifs_debug.h"
-#include "cifs_unicode.h"
-#include "cifsproto.h"
-#include "ntlmssp.h"
-#include <linux/ctype.h>
-#include <linux/random.h>
-#include <linux/highmem.h>
-#include <linux/fips.h>
-#include "../smbfs_common/arc4.h"
-#include <crypto/aead.h>
-
-/*
- * Hash data from a BVEC-type iterator.
- */
-static int cifs_shash_bvec(const struct iov_iter *iter, ssize_t maxsize,
- struct shash_desc *shash)
-{
- const struct bio_vec *bv = iter->bvec;
- unsigned long start = iter->iov_offset;
- unsigned int i;
- void *p;
- int ret;
-
- for (i = 0; i < iter->nr_segs; i++) {
- size_t off, len;
-
- len = bv[i].bv_len;
- if (start >= len) {
- start -= len;
- continue;
- }
-
- len = min_t(size_t, maxsize, len - start);
- off = bv[i].bv_offset + start;
-
- p = kmap_local_page(bv[i].bv_page);
- ret = crypto_shash_update(shash, p + off, len);
- kunmap_local(p);
- if (ret < 0)
- return ret;
-
- maxsize -= len;
- if (maxsize <= 0)
- break;
- start = 0;
- }
-
- return 0;
-}
-
-/*
- * Hash data from a KVEC-type iterator.
- */
-static int cifs_shash_kvec(const struct iov_iter *iter, ssize_t maxsize,
- struct shash_desc *shash)
-{
- const struct kvec *kv = iter->kvec;
- unsigned long start = iter->iov_offset;
- unsigned int i;
- int ret;
-
- for (i = 0; i < iter->nr_segs; i++) {
- size_t len;
-
- len = kv[i].iov_len;
- if (start >= len) {
- start -= len;
- continue;
- }
-
- len = min_t(size_t, maxsize, len - start);
- ret = crypto_shash_update(shash, kv[i].iov_base + start, len);
- if (ret < 0)
- return ret;
- maxsize -= len;
-
- if (maxsize <= 0)
- break;
- start = 0;
- }
-
- return 0;
-}
-
-/*
- * Hash data from an XARRAY-type iterator.
- */
-static ssize_t cifs_shash_xarray(const struct iov_iter *iter, ssize_t maxsize,
- struct shash_desc *shash)
-{
- struct folio *folios[16], *folio;
- unsigned int nr, i, j, npages;
- loff_t start = iter->xarray_start + iter->iov_offset;
- pgoff_t last, index = start / PAGE_SIZE;
- ssize_t ret = 0;
- size_t len, offset, foffset;
- void *p;
-
- if (maxsize == 0)
- return 0;
-
- last = (start + maxsize - 1) / PAGE_SIZE;
- do {
- nr = xa_extract(iter->xarray, (void **)folios, index, last,
- ARRAY_SIZE(folios), XA_PRESENT);
- if (nr == 0)
- return -EIO;
-
- for (i = 0; i < nr; i++) {
- folio = folios[i];
- npages = folio_nr_pages(folio);
- foffset = start - folio_pos(folio);
- offset = foffset % PAGE_SIZE;
- for (j = foffset / PAGE_SIZE; j < npages; j++) {
- len = min_t(size_t, maxsize, PAGE_SIZE - offset);
- p = kmap_local_page(folio_page(folio, j));
- ret = crypto_shash_update(shash, p, len);
- kunmap_local(p);
- if (ret < 0)
- return ret;
- maxsize -= len;
- if (maxsize <= 0)
- return 0;
- start += len;
- offset = 0;
- index++;
- }
- }
- } while (nr == ARRAY_SIZE(folios));
- return 0;
-}
-
-/*
- * Pass the data from an iterator into a hash.
- */
-static int cifs_shash_iter(const struct iov_iter *iter, size_t maxsize,
- struct shash_desc *shash)
-{
- if (maxsize == 0)
- return 0;
-
- switch (iov_iter_type(iter)) {
- case ITER_BVEC:
- return cifs_shash_bvec(iter, maxsize, shash);
- case ITER_KVEC:
- return cifs_shash_kvec(iter, maxsize, shash);
- case ITER_XARRAY:
- return cifs_shash_xarray(iter, maxsize, shash);
- default:
- pr_err("cifs_shash_iter(%u) unsupported\n", iov_iter_type(iter));
- WARN_ON_ONCE(1);
- return -EIO;
- }
-}
-
-int __cifs_calc_signature(struct smb_rqst *rqst,
- struct TCP_Server_Info *server, char *signature,
- struct shash_desc *shash)
-{
- int i;
- ssize_t rc;
- struct kvec *iov = rqst->rq_iov;
- int n_vec = rqst->rq_nvec;
-
- /* iov[0] is actual data and not the rfc1002 length for SMB2+ */
- if (!is_smb1(server)) {
- if (iov[0].iov_len <= 4)
- return -EIO;
- i = 0;
- } else {
- if (n_vec < 2 || iov[0].iov_len != 4)
- return -EIO;
- i = 1; /* skip rfc1002 length */
- }
-
- for (; i < n_vec; i++) {
- if (iov[i].iov_len == 0)
- continue;
- if (iov[i].iov_base == NULL) {
- cifs_dbg(VFS, "null iovec entry\n");
- return -EIO;
- }
-
- rc = crypto_shash_update(shash,
- iov[i].iov_base, iov[i].iov_len);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with payload\n",
- __func__);
- return rc;
- }
- }
-
- rc = cifs_shash_iter(&rqst->rq_iter, iov_iter_count(&rqst->rq_iter), shash);
- if (rc < 0)
- return rc;
-
- rc = crypto_shash_final(shash, signature);
- if (rc)
- cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
-
- return rc;
-}
-
-/*
- * Calculate and return the CIFS signature based on the mac key and SMB PDU.
- * The 16 byte signature must be allocated by the caller. Note we only use the
- * 1st eight bytes and that the smb header signature field on input contains
- * the sequence number before this function is called. Also, this function
- * should be called with the server->srv_mutex held.
- */
-static int cifs_calc_signature(struct smb_rqst *rqst,
- struct TCP_Server_Info *server, char *signature)
-{
- int rc;
-
- if (!rqst->rq_iov || !signature || !server)
- return -EINVAL;
-
- rc = cifs_alloc_hash("md5", &server->secmech.md5);
- if (rc)
- return -1;
-
- rc = crypto_shash_init(server->secmech.md5);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
- return rc;
- }
-
- rc = crypto_shash_update(server->secmech.md5,
- server->session_key.response, server->session_key.len);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
- return rc;
- }
-
- return __cifs_calc_signature(rqst, server, signature, server->secmech.md5);
-}
-
-/* must be called with server->srv_mutex held */
-int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
- __u32 *pexpected_response_sequence_number)
-{
- int rc = 0;
- char smb_signature[20];
- struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
-
- if (rqst->rq_iov[0].iov_len != 4 ||
- rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
- return -EIO;
-
- if ((cifs_pdu == NULL) || (server == NULL))
- return -EINVAL;
-
- spin_lock(&server->srv_lock);
- if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
- server->tcpStatus == CifsNeedNegotiate) {
- spin_unlock(&server->srv_lock);
- return rc;
- }
- spin_unlock(&server->srv_lock);
-
- if (!server->session_estab) {
- memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
- return rc;
- }
-
- cifs_pdu->Signature.Sequence.SequenceNumber =
- cpu_to_le32(server->sequence_number);
- cifs_pdu->Signature.Sequence.Reserved = 0;
-
- *pexpected_response_sequence_number = ++server->sequence_number;
- ++server->sequence_number;
-
- rc = cifs_calc_signature(rqst, server, smb_signature);
- if (rc)
- memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
- else
- memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
-
- return rc;
-}
-
-int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
- __u32 *pexpected_response_sequence)
-{
- struct smb_rqst rqst = { .rq_iov = iov,
- .rq_nvec = n_vec };
-
- return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
-}
-
-/* must be called with server->srv_mutex held */
-int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
- __u32 *pexpected_response_sequence_number)
-{
- struct kvec iov[2];
-
- iov[0].iov_base = cifs_pdu;
- iov[0].iov_len = 4;
- iov[1].iov_base = (char *)cifs_pdu + 4;
- iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
-
- return cifs_sign_smbv(iov, 2, server,
- pexpected_response_sequence_number);
-}
-
-int cifs_verify_signature(struct smb_rqst *rqst,
- struct TCP_Server_Info *server,
- __u32 expected_sequence_number)
-{
- unsigned int rc;
- char server_response_sig[8];
- char what_we_think_sig_should_be[20];
- struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
-
- if (rqst->rq_iov[0].iov_len != 4 ||
- rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
- return -EIO;
-
- if (cifs_pdu == NULL || server == NULL)
- return -EINVAL;
-
- if (!server->session_estab)
- return 0;
-
- if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
- struct smb_com_lock_req *pSMB =
- (struct smb_com_lock_req *)cifs_pdu;
- if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
- return 0;
- }
-
- /* BB what if signatures are supposed to be on for session but
- server does not send one? BB */
-
- /* Do not need to verify session setups with signature "BSRSPYL " */
- if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
- cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
- cifs_pdu->Command);
-
- /* save off the origiginal signature so we can modify the smb and check
- its signature against what the server sent */
- memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
-
- cifs_pdu->Signature.Sequence.SequenceNumber =
- cpu_to_le32(expected_sequence_number);
- cifs_pdu->Signature.Sequence.Reserved = 0;
-
- cifs_server_lock(server);
- rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
- cifs_server_unlock(server);
-
- if (rc)
- return rc;
-
-/* cifs_dump_mem("what we think it should be: ",
- what_we_think_sig_should_be, 16); */
-
- if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
- return -EACCES;
- else
- return 0;
-
-}
-
-/* Build a proper attribute value/target info pairs blob.
- * Fill in netbios and dns domain name and workstation name
- * and client time (total five av pairs and + one end of fields indicator.
- * Allocate domain name which gets freed when session struct is deallocated.
- */
-static int
-build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
-{
- unsigned int dlen;
- unsigned int size = 2 * sizeof(struct ntlmssp2_name);
- char *defdmname = "WORKGROUP";
- unsigned char *blobptr;
- struct ntlmssp2_name *attrptr;
-
- if (!ses->domainName) {
- ses->domainName = kstrdup(defdmname, GFP_KERNEL);
- if (!ses->domainName)
- return -ENOMEM;
- }
-
- dlen = strlen(ses->domainName);
-
- /*
- * The length of this blob is two times the size of a
- * structure (av pair) which holds name/size
- * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
- * unicode length of a netbios domain name
- */
- kfree_sensitive(ses->auth_key.response);
- ses->auth_key.len = size + 2 * dlen;
- ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
- if (!ses->auth_key.response) {
- ses->auth_key.len = 0;
- return -ENOMEM;
- }
-
- blobptr = ses->auth_key.response;
- attrptr = (struct ntlmssp2_name *) blobptr;
-
- /*
- * As defined in MS-NTLM 3.3.2, just this av pair field
- * is sufficient as part of the temp
- */
- attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
- attrptr->length = cpu_to_le16(2 * dlen);
- blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
- cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
-
- return 0;
-}
-
-/* Server has provided av pairs/target info in the type 2 challenge
- * packet and we have plucked it and stored within smb session.
- * We parse that blob here to find netbios domain name to be used
- * as part of ntlmv2 authentication (in Target String), if not already
- * specified on the command line.
- * If this function returns without any error but without fetching
- * domain name, authentication may fail against some server but
- * may not fail against other (those who are not very particular
- * about target string i.e. for some, just user name might suffice.
- */
-static int
-find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
-{
- unsigned int attrsize;
- unsigned int type;
- unsigned int onesize = sizeof(struct ntlmssp2_name);
- unsigned char *blobptr;
- unsigned char *blobend;
- struct ntlmssp2_name *attrptr;
-
- if (!ses->auth_key.len || !ses->auth_key.response)
- return 0;
-
- blobptr = ses->auth_key.response;
- blobend = blobptr + ses->auth_key.len;
-
- while (blobptr + onesize < blobend) {
- attrptr = (struct ntlmssp2_name *) blobptr;
- type = le16_to_cpu(attrptr->type);
- if (type == NTLMSSP_AV_EOL)
- break;
- blobptr += 2; /* advance attr type */
- attrsize = le16_to_cpu(attrptr->length);
- blobptr += 2; /* advance attr size */
- if (blobptr + attrsize > blobend)
- break;
- if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
- if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
- break;
- if (!ses->domainName) {
- ses->domainName =
- kmalloc(attrsize + 1, GFP_KERNEL);
- if (!ses->domainName)
- return -ENOMEM;
- cifs_from_utf16(ses->domainName,
- (__le16 *)blobptr, attrsize, attrsize,
- nls_cp, NO_MAP_UNI_RSVD);
- break;
- }
- }
- blobptr += attrsize; /* advance attr value */
- }
-
- return 0;
-}
-
-/* Server has provided av pairs/target info in the type 2 challenge
- * packet and we have plucked it and stored within smb session.
- * We parse that blob here to find the server given timestamp
- * as part of ntlmv2 authentication (or local current time as
- * default in case of failure)
- */
-static __le64
-find_timestamp(struct cifs_ses *ses)
-{
- unsigned int attrsize;
- unsigned int type;
- unsigned int onesize = sizeof(struct ntlmssp2_name);
- unsigned char *blobptr;
- unsigned char *blobend;
- struct ntlmssp2_name *attrptr;
- struct timespec64 ts;
-
- if (!ses->auth_key.len || !ses->auth_key.response)
- return 0;
-
- blobptr = ses->auth_key.response;
- blobend = blobptr + ses->auth_key.len;
-
- while (blobptr + onesize < blobend) {
- attrptr = (struct ntlmssp2_name *) blobptr;
- type = le16_to_cpu(attrptr->type);
- if (type == NTLMSSP_AV_EOL)
- break;
- blobptr += 2; /* advance attr type */
- attrsize = le16_to_cpu(attrptr->length);
- blobptr += 2; /* advance attr size */
- if (blobptr + attrsize > blobend)
- break;
- if (type == NTLMSSP_AV_TIMESTAMP) {
- if (attrsize == sizeof(u64))
- return *((__le64 *)blobptr);
- }
- blobptr += attrsize; /* advance attr value */
- }
-
- ktime_get_real_ts64(&ts);
- return cpu_to_le64(cifs_UnixTimeToNT(ts));
-}
-
-static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
- const struct nls_table *nls_cp)
-{
- int rc = 0;
- int len;
- char nt_hash[CIFS_NTHASH_SIZE];
- __le16 *user;
- wchar_t *domain;
- wchar_t *server;
-
- if (!ses->server->secmech.hmacmd5) {
- cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
- return -1;
- }
-
- /* calculate md4 hash of password */
- E_md4hash(ses->password, nt_hash, nls_cp);
-
- rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm, nt_hash,
- CIFS_NTHASH_SIZE);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
- return rc;
- }
-
- rc = crypto_shash_init(ses->server->secmech.hmacmd5);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
- return rc;
- }
-
- /* convert ses->user_name to unicode */
- len = ses->user_name ? strlen(ses->user_name) : 0;
- user = kmalloc(2 + (len * 2), GFP_KERNEL);
- if (user == NULL) {
- rc = -ENOMEM;
- return rc;
- }
-
- if (len) {
- len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
- UniStrupr(user);
- } else {
- memset(user, '\0', 2);
- }
-
- rc = crypto_shash_update(ses->server->secmech.hmacmd5,
- (char *)user, 2 * len);
- kfree(user);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
- return rc;
- }
-
- /* convert ses->domainName to unicode and uppercase */
- if (ses->domainName) {
- len = strlen(ses->domainName);
-
- domain = kmalloc(2 + (len * 2), GFP_KERNEL);
- if (domain == NULL) {
- rc = -ENOMEM;
- return rc;
- }
- len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
- nls_cp);
- rc =
- crypto_shash_update(ses->server->secmech.hmacmd5,
- (char *)domain, 2 * len);
- kfree(domain);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with domain\n",
- __func__);
- return rc;
- }
- } else {
- /* We use ses->ip_addr if no domain name available */
- len = strlen(ses->ip_addr);
-
- server = kmalloc(2 + (len * 2), GFP_KERNEL);
- if (server == NULL) {
- rc = -ENOMEM;
- return rc;
- }
- len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
- nls_cp);
- rc =
- crypto_shash_update(ses->server->secmech.hmacmd5,
- (char *)server, 2 * len);
- kfree(server);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with server\n",
- __func__);
- return rc;
- }
- }
-
- rc = crypto_shash_final(ses->server->secmech.hmacmd5,
- ntlmv2_hash);
- if (rc)
- cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
-
- return rc;
-}
-
-static int
-CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
-{
- int rc;
- struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
- (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
- unsigned int hash_len;
-
- /* The MD5 hash starts at challenge_key.key */
- hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
- offsetof(struct ntlmv2_resp, challenge.key[0]));
-
- if (!ses->server->secmech.hmacmd5) {
- cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
- return -1;
- }
-
- rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
- ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
- __func__);
- return rc;
- }
-
- rc = crypto_shash_init(ses->server->secmech.hmacmd5);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
- return rc;
- }
-
- if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
- memcpy(ntlmv2->challenge.key,
- ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
- else
- memcpy(ntlmv2->challenge.key,
- ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
- rc = crypto_shash_update(ses->server->secmech.hmacmd5,
- ntlmv2->challenge.key, hash_len);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
- return rc;
- }
-
- /* Note that the MD5 digest over writes anon.challenge_key.key */
- rc = crypto_shash_final(ses->server->secmech.hmacmd5,
- ntlmv2->ntlmv2_hash);
- if (rc)
- cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
-
- return rc;
-}
-
-int
-setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
-{
- int rc;
- int baselen;
- unsigned int tilen;
- struct ntlmv2_resp *ntlmv2;
- char ntlmv2_hash[16];
- unsigned char *tiblob = NULL; /* target info blob */
- __le64 rsp_timestamp;
-
- if (nls_cp == NULL) {
- cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
- return -EINVAL;
- }
-
- if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
- if (!ses->domainName) {
- if (ses->domainAuto) {
- rc = find_domain_name(ses, nls_cp);
- if (rc) {
- cifs_dbg(VFS, "error %d finding domain name\n",
- rc);
- goto setup_ntlmv2_rsp_ret;
- }
- } else {
- ses->domainName = kstrdup("", GFP_KERNEL);
- }
- }
- } else {
- rc = build_avpair_blob(ses, nls_cp);
- if (rc) {
- cifs_dbg(VFS, "error %d building av pair blob\n", rc);
- goto setup_ntlmv2_rsp_ret;
- }
- }
-
- /* Must be within 5 minutes of the server (or in range +/-2h
- * in case of Mac OS X), so simply carry over server timestamp
- * (as Windows 7 does)
- */
- rsp_timestamp = find_timestamp(ses);
-
- baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
- tilen = ses->auth_key.len;
- tiblob = ses->auth_key.response;
-
- ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
- if (!ses->auth_key.response) {
- rc = -ENOMEM;
- ses->auth_key.len = 0;
- goto setup_ntlmv2_rsp_ret;
- }
- ses->auth_key.len += baselen;
-
- ntlmv2 = (struct ntlmv2_resp *)
- (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
- ntlmv2->blob_signature = cpu_to_le32(0x00000101);
- ntlmv2->reserved = 0;
- ntlmv2->time = rsp_timestamp;
-
- get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
- ntlmv2->reserved2 = 0;
-
- memcpy(ses->auth_key.response + baselen, tiblob, tilen);
-
- cifs_server_lock(ses->server);
-
- rc = cifs_alloc_hash("hmac(md5)", &ses->server->secmech.hmacmd5);
- if (rc) {
- goto unlock;
- }
-
- /* calculate ntlmv2_hash */
- rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
- if (rc) {
- cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
- goto unlock;
- }
-
- /* calculate first part of the client response (CR1) */
- rc = CalcNTLMv2_response(ses, ntlmv2_hash);
- if (rc) {
- cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
- goto unlock;
- }
-
- /* now calculate the session key for NTLMv2 */
- rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
- ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
- __func__);
- goto unlock;
- }
-
- rc = crypto_shash_init(ses->server->secmech.hmacmd5);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
- goto unlock;
- }
-
- rc = crypto_shash_update(ses->server->secmech.hmacmd5,
- ntlmv2->ntlmv2_hash,
- CIFS_HMAC_MD5_HASH_SIZE);
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
- goto unlock;
- }
-
- rc = crypto_shash_final(ses->server->secmech.hmacmd5,
- ses->auth_key.response);
- if (rc)
- cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
-
-unlock:
- cifs_server_unlock(ses->server);
-setup_ntlmv2_rsp_ret:
- kfree_sensitive(tiblob);
-
- return rc;
-}
-
-int
-calc_seckey(struct cifs_ses *ses)
-{
- unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
- struct arc4_ctx *ctx_arc4;
-
- if (fips_enabled)
- return -ENODEV;
-
- get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
-
- ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
- if (!ctx_arc4) {
- cifs_dbg(VFS, "Could not allocate arc4 context\n");
- return -ENOMEM;
- }
-
- cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
- cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
- CIFS_CPHTXT_SIZE);
-
- /* make secondary_key/nonce as session key */
- memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
- /* and make len as that of session key only */
- ses->auth_key.len = CIFS_SESS_KEY_SIZE;
-
- memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
- kfree_sensitive(ctx_arc4);
- return 0;
-}
-
-void
-cifs_crypto_secmech_release(struct TCP_Server_Info *server)
-{
- cifs_free_hash(&server->secmech.aes_cmac);
- cifs_free_hash(&server->secmech.hmacsha256);
- cifs_free_hash(&server->secmech.md5);
- cifs_free_hash(&server->secmech.sha512);
- cifs_free_hash(&server->secmech.hmacmd5);
-
- if (server->secmech.enc) {
- crypto_free_aead(server->secmech.enc);
- server->secmech.enc = NULL;
- }
-
- if (server->secmech.dec) {
- crypto_free_aead(server->secmech.dec);
- server->secmech.dec = NULL;
- }
-}
generated by cgit (git 2.34.1) at 2024-06-14 20:50:22 +0000