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-rw-r--r--fs/smb/client/cifsencrypt.c660
1 files changed, 660 insertions, 0 deletions
diff --git a/fs/smb/client/cifsencrypt.c b/fs/smb/client/cifsencrypt.c
new file mode 100644
index 000000000000..ca2a84e8673e
--- /dev/null
+++ b/fs/smb/client/cifsencrypt.c
@@ -0,0 +1,660 @@
+// 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 <linux/iov_iter.h>
+#include <crypto/aead.h>
+#include <crypto/arc4.h>
+#include <crypto/md5.h>
+#include <crypto/sha2.h>
+
+static int cifs_sig_update(struct cifs_calc_sig_ctx *ctx,
+ const u8 *data, size_t len)
+{
+ if (ctx->md5) {
+ md5_update(ctx->md5, data, len);
+ return 0;
+ }
+ if (ctx->hmac) {
+ hmac_sha256_update(ctx->hmac, data, len);
+ return 0;
+ }
+ return crypto_shash_update(ctx->shash, data, len);
+}
+
+static int cifs_sig_final(struct cifs_calc_sig_ctx *ctx, u8 *out)
+{
+ if (ctx->md5) {
+ md5_final(ctx->md5, out);
+ return 0;
+ }
+ if (ctx->hmac) {
+ hmac_sha256_final(ctx->hmac, out);
+ return 0;
+ }
+ return crypto_shash_final(ctx->shash, out);
+}
+
+static size_t cifs_sig_step(void *iter_base, size_t progress, size_t len,
+ void *priv, void *priv2)
+{
+ struct cifs_calc_sig_ctx *ctx = priv;
+ int ret, *pret = priv2;
+
+ ret = cifs_sig_update(ctx, iter_base, len);
+ if (ret < 0) {
+ *pret = ret;
+ return len;
+ }
+ return 0;
+}
+
+/*
+ * Pass the data from an iterator into a hash.
+ */
+static int cifs_sig_iter(const struct iov_iter *iter, size_t maxsize,
+ struct cifs_calc_sig_ctx *ctx)
+{
+ struct iov_iter tmp_iter = *iter;
+ size_t did;
+ int err;
+
+ did = iterate_and_advance_kernel(&tmp_iter, maxsize, ctx, &err,
+ cifs_sig_step);
+ if (did != maxsize)
+ return smb_EIO2(smb_eio_trace_sig_iter, did, maxsize);
+ return 0;
+}
+
+int __cifs_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
+ char *signature, struct cifs_calc_sig_ctx *ctx)
+{
+ struct iov_iter iter;
+ ssize_t rc;
+ size_t size = 0;
+
+ for (int i = 0; i < rqst->rq_nvec; i++)
+ size += rqst->rq_iov[i].iov_len;
+
+ iov_iter_kvec(&iter, ITER_SOURCE, rqst->rq_iov, rqst->rq_nvec, size);
+
+ if (iov_iter_count(&iter) <= 4)
+ return smb_EIO2(smb_eio_trace_sig_data_too_small,
+ iov_iter_count(&iter), 4);
+
+ rc = cifs_sig_iter(&iter, iov_iter_count(&iter), ctx);
+ if (rc < 0)
+ return rc;
+
+ rc = cifs_sig_iter(&rqst->rq_iter, iov_iter_count(&rqst->rq_iter), ctx);
+ if (rc < 0)
+ return rc;
+
+ rc = cifs_sig_final(ctx, 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)
+{
+ struct md5_ctx ctx;
+
+ if (!rqst->rq_iov || !signature || !server)
+ return -EINVAL;
+ if (fips_enabled) {
+ cifs_dbg(VFS,
+ "MD5 signature support is disabled due to FIPS\n");
+ return -EOPNOTSUPP;
+ }
+
+ md5_init(&ctx);
+ md5_update(&ctx, server->session_key.response, server->session_key.len);
+
+ return __cifs_calc_signature(
+ rqst, server, signature,
+ &(struct cifs_calc_sig_ctx){ .md5 = &ctx });
+}
+
+/* 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 ((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_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 (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 original 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;
+}
+
+#define AV_TYPE(av) (le16_to_cpu(av->type))
+#define AV_LEN(av) (le16_to_cpu(av->length))
+#define AV_DATA_PTR(av) ((void *)av->data)
+
+#define av_for_each_entry(ses, av) \
+ for (av = NULL; (av = find_next_av(ses, av));)
+
+static struct ntlmssp2_name *find_next_av(struct cifs_ses *ses,
+ struct ntlmssp2_name *av)
+{
+ u16 len;
+ u8 *end;
+
+ end = (u8 *)ses->auth_key.response + ses->auth_key.len;
+ if (!av) {
+ if (unlikely(!ses->auth_key.response || !ses->auth_key.len))
+ return NULL;
+ av = (void *)ses->auth_key.response;
+ } else {
+ av = (void *)((u8 *)av + sizeof(*av) + AV_LEN(av));
+ }
+
+ if ((u8 *)av + sizeof(*av) > end)
+ return NULL;
+
+ len = AV_LEN(av);
+ if (AV_TYPE(av) == NTLMSSP_AV_EOL)
+ return NULL;
+ if ((u8 *)av + sizeof(*av) + len > end)
+ return NULL;
+ return av;
+}
+
+/*
+ * Check if server has provided av pair of @type in the NTLMSSP
+ * CHALLENGE_MESSAGE blob.
+ */
+static int find_av_name(struct cifs_ses *ses, u16 type, char **name, u16 maxlen)
+{
+ const struct nls_table *nlsc = ses->local_nls;
+ struct ntlmssp2_name *av;
+ u16 len, nlen;
+
+ if (*name)
+ return 0;
+
+ av_for_each_entry(ses, av) {
+ len = AV_LEN(av);
+ if (AV_TYPE(av) != type || !len)
+ continue;
+ if (!IS_ALIGNED(len, sizeof(__le16))) {
+ cifs_dbg(VFS | ONCE, "%s: bad length(%u) for type %u\n",
+ __func__, len, type);
+ continue;
+ }
+ nlen = len / sizeof(__le16);
+ if (nlen <= maxlen) {
+ ++nlen;
+ *name = kmalloc(nlen, GFP_KERNEL);
+ if (!*name)
+ return -ENOMEM;
+ cifs_from_utf16(*name, AV_DATA_PTR(av), nlen,
+ len, nlsc, NO_MAP_UNI_RSVD);
+ break;
+ }
+ }
+ 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)
+{
+ struct ntlmssp2_name *av;
+ struct timespec64 ts;
+
+ av_for_each_entry(ses, av) {
+ if (AV_TYPE(av) == NTLMSSP_AV_TIMESTAMP &&
+ AV_LEN(av) == sizeof(u64))
+ return *((__le64 *)AV_DATA_PTR(av));
+ }
+ 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 len;
+ char nt_hash[CIFS_NTHASH_SIZE];
+ struct hmac_md5_ctx hmac_ctx;
+ __le16 *user;
+ wchar_t *domain;
+ wchar_t *server;
+
+ /* calculate md4 hash of password */
+ E_md4hash(ses->password, nt_hash, nls_cp);
+
+ hmac_md5_init_usingrawkey(&hmac_ctx, nt_hash, CIFS_NTHASH_SIZE);
+
+ /* 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)
+ return -ENOMEM;
+
+ if (len) {
+ len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
+ UniStrupr(user);
+ } else {
+ *(u16 *)user = 0;
+ }
+
+ hmac_md5_update(&hmac_ctx, (const u8 *)user, 2 * len);
+ kfree(user);
+
+ /* convert ses->domainName to unicode and uppercase */
+ if (ses->domainName) {
+ len = strlen(ses->domainName);
+
+ domain = kmalloc(2 + (len * 2), GFP_KERNEL);
+ if (domain == NULL)
+ return -ENOMEM;
+
+ len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
+ nls_cp);
+ hmac_md5_update(&hmac_ctx, (const u8 *)domain, 2 * len);
+ kfree(domain);
+ } 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)
+ return -ENOMEM;
+
+ len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len, nls_cp);
+ hmac_md5_update(&hmac_ctx, (const u8 *)server, 2 * len);
+ kfree(server);
+ }
+
+ hmac_md5_final(&hmac_ctx, ntlmv2_hash);
+ return 0;
+}
+
+static void CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
+{
+ 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->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);
+
+ /* Note that the HMAC-MD5 value overwrites ntlmv2->challenge.key */
+ hmac_md5_usingrawkey(ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE,
+ ntlmv2->challenge.key, hash_len,
+ ntlmv2->ntlmv2_hash);
+}
+
+/*
+ * Set up NTLMv2 response blob with SPN (cifs/<hostname>) appended to the
+ * existing list of AV pairs.
+ */
+static int set_auth_key_response(struct cifs_ses *ses)
+{
+ size_t baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
+ size_t len, spnlen, tilen = 0, num_avs = 2 /* SPN + EOL */;
+ struct TCP_Server_Info *server = ses->server;
+ char *spn __free(kfree) = NULL;
+ struct ntlmssp2_name *av;
+ char *rsp = NULL;
+ int rc;
+
+ spnlen = strlen(server->hostname);
+ len = sizeof("cifs/") + spnlen;
+ spn = kmalloc(len, GFP_KERNEL);
+ if (!spn) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ spnlen = scnprintf(spn, len, "cifs/%.*s",
+ (int)spnlen, server->hostname);
+
+ av_for_each_entry(ses, av)
+ tilen += sizeof(*av) + AV_LEN(av);
+
+ len = baselen + tilen + spnlen * sizeof(__le16) + num_avs * sizeof(*av);
+ rsp = kmalloc(len, GFP_KERNEL);
+ if (!rsp) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ memcpy(rsp + baselen, ses->auth_key.response, tilen);
+ av = (void *)(rsp + baselen + tilen);
+ av->type = cpu_to_le16(NTLMSSP_AV_TARGET_NAME);
+ av->length = cpu_to_le16(spnlen * sizeof(__le16));
+ cifs_strtoUTF16((__le16 *)av->data, spn, spnlen, ses->local_nls);
+ av = (void *)((__u8 *)av + sizeof(*av) + AV_LEN(av));
+ av->type = cpu_to_le16(NTLMSSP_AV_EOL);
+ av->length = 0;
+
+ rc = 0;
+ ses->auth_key.len = len;
+out:
+ ses->auth_key.response = rsp;
+ return rc;
+}
+
+int
+setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
+{
+ unsigned char *tiblob = NULL; /* target info blob */
+ struct ntlmv2_resp *ntlmv2;
+ char ntlmv2_hash[16];
+ __le64 rsp_timestamp;
+ __u64 cc;
+ int rc;
+
+ 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) {
+ /*
+ * Domain (workgroup) hasn't been specified in
+ * mount options, so try to find it in
+ * CHALLENGE_MESSAGE message and then use it as
+ * part of NTLMv2 authentication.
+ */
+ rc = find_av_name(ses, NTLMSSP_AV_NB_DOMAIN_NAME,
+ &ses->domainName,
+ CIFS_MAX_DOMAINNAME_LEN);
+ if (rc)
+ goto setup_ntlmv2_rsp_ret;
+ } else {
+ ses->domainName = kstrdup("", GFP_KERNEL);
+ if (!ses->domainName) {
+ rc = -ENOMEM;
+ goto setup_ntlmv2_rsp_ret;
+ }
+ }
+ }
+ rc = find_av_name(ses, NTLMSSP_AV_DNS_DOMAIN_NAME,
+ &ses->dns_dom, CIFS_MAX_DOMAINNAME_LEN);
+ if (rc)
+ goto setup_ntlmv2_rsp_ret;
+ } 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);
+ get_random_bytes(&cc, sizeof(cc));
+
+ cifs_server_lock(ses->server);
+
+ tiblob = ses->auth_key.response;
+ rc = set_auth_key_response(ses);
+ if (rc) {
+ ses->auth_key.len = 0;
+ goto unlock;
+ }
+
+ 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;
+ ntlmv2->client_chal = cc;
+ ntlmv2->reserved2 = 0;
+
+ if (fips_enabled) {
+ cifs_dbg(VFS, "NTLMv2 support is disabled due to FIPS\n");
+ rc = -EOPNOTSUPP;
+ goto unlock;
+ }
+
+ /* calculate ntlmv2_hash */
+ rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
+ if (rc) {
+ cifs_dbg(VFS, "Could not get NTLMv2 hash, rc=%d\n", rc);
+ goto unlock;
+ }
+
+ /* calculate first part of the client response (CR1) */
+ CalcNTLMv2_response(ses, ntlmv2_hash);
+
+ /* now calculate the session key for NTLMv2 */
+ hmac_md5_usingrawkey(ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE,
+ ntlmv2->ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE,
+ ses->auth_key.response);
+ rc = 0;
+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;
+ }
+
+ arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
+ 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);
+
+ 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 2025-12-25 07:45:06 +0000