static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
struct dm_crypt_request *dmreq,
u8 *data)
{
struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
struct {
struct shash_desc desc;
char ctx[crypto_shash_descsize(lmk->hash_tfm)];
} sdesc;
struct md5_state md5state;
u32 buf[4];
int i, r;
sdesc.desc.tfm = lmk->hash_tfm;
sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
r = crypto_shash_init(&sdesc.desc);
if (r)
return r;
if (lmk->seed) {
r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE);
if (r)
return r;
}
/* Sector is always 512B, block size 16, add data of blocks 1-31 */
r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31);
if (r)
return r;
/* Sector is cropped to 56 bits here */
buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
buf[2] = cpu_to_le32(4024);
buf[3] = 0;
r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf));
if (r)
return r;
/* No MD5 padding here */
r = crypto_shash_export(&sdesc.desc, &md5state);
if (r)
return r;
for (i = 0; i < MD5_HASH_WORDS; i++)
__cpu_to_le32s(&md5state.hash[i]);
memcpy(iv, &md5state.hash, cc->iv_size);
return 0;
}
/*
* Calculate the HMAC value across the set of protected security xattrs.
*
* Instead of retrieving the requested xattr, for performance, calculate
* the hmac using the requested xattr value. Don't alloc/free memory for
* each xattr, but attempt to re-use the previously allocated memory.
*/
static int evm_calc_hmac_or_hash(struct dentry *dentry,
const char *req_xattr_name,
const char *req_xattr_value,
size_t req_xattr_value_len,
char type, char *digest)
{
struct inode *inode = dentry->d_inode;
struct shash_desc *desc;
char **xattrname;
size_t xattr_size = 0;
char *xattr_value = NULL;
int error;
int size;
if (!inode->i_op || !inode->i_op->getxattr)
return -EOPNOTSUPP;
desc = init_desc(type);
if (IS_ERR(desc))
return PTR_ERR(desc);
error = -ENODATA;
for (xattrname = evm_config_xattrnames; *xattrname != NULL; xattrname++) {
if ((req_xattr_name && req_xattr_value)
&& !strcmp(*xattrname, req_xattr_name)) {
error = 0;
crypto_shash_update(desc, (const u8 *)req_xattr_value,
req_xattr_value_len);
continue;
}
size = vfs_getxattr_alloc(dentry, *xattrname,
&xattr_value, xattr_size, GFP_NOFS);
if (size == -ENOMEM) {
error = -ENOMEM;
goto out;
}
if (size < 0)
continue;
error = 0;
xattr_size = size;
crypto_shash_update(desc, (const u8 *)xattr_value, xattr_size);
}
hmac_add_misc(desc, inode, digest);
out:
kfree(xattr_value);
kfree(desc);
return error;
}
static int calc_buffer_shash_tfm(const void *buf, loff_t size,
struct ima_digest_data *hash,
struct crypto_shash *tfm)
{
SHASH_DESC_ON_STACK(shash, tfm);
unsigned int len;
int rc;
shash->tfm = tfm;
shash->flags = 0;
hash->length = crypto_shash_digestsize(tfm);
rc = crypto_shash_init(shash);
if (rc != 0)
return rc;
while (size) {
len = size < PAGE_SIZE ? size : PAGE_SIZE;
rc = crypto_shash_update(shash, buf, len);
if (rc)
break;
buf += len;
size -= len;
}
if (!rc)
rc = crypto_shash_final(shash, hash->digest);
return rc;
}
char *aa_calc_hash(void *data, size_t len)
{
SHASH_DESC_ON_STACK(desc, apparmor_tfm);
char *hash = NULL;
int error = -ENOMEM;
if (!apparmor_tfm)
return NULL;
hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
if (!hash)
goto fail;
desc->tfm = apparmor_tfm;
error = crypto_shash_init(desc);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) data, len);
if (error)
goto fail;
error = crypto_shash_final(desc, hash);
if (error)
goto fail;
return hash;
fail:
kfree(hash);
return ERR_PTR(error);
}
static int mv_hash_final_fallback(struct ahash_request *req)
{
const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
struct mv_req_hash_ctx *req_ctx = ahash_request_ctx(req);
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(tfm_ctx->fallback)];
} desc;
int rc;
desc.shash.tfm = tfm_ctx->fallback;
desc.shash.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
if (unlikely(req_ctx->first_hash)) {
crypto_shash_init(&desc.shash);
crypto_shash_update(&desc.shash, req_ctx->buffer,
req_ctx->extra_bytes);
} else {
/* only SHA1 for now....
*/
rc = mv_hash_import_sha1_ctx(req_ctx, &desc.shash);
if (rc)
goto out;
}
rc = crypto_shash_final(&desc.shash, req->result);
out:
return rc;
}
static int
CalcNTLMv2_response(const struct cifsSesInfo *ses, char *ntlmv2_hash)
{
int rc;
unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
if (!ses->server->secmech.sdeschmacmd5) {
cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
return -1;
}
crypto_shash_setkey(ses->server->secmech.hmacmd5,
ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
if (rc) {
cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
return rc;
}
if (ses->server->secType == RawNTLMSSP)
memcpy(ses->auth_key.response + offset,
ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
else
memcpy(ses->auth_key.response + offset,
ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
ses->auth_key.response + offset, ses->auth_key.len - offset);
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
ses->auth_key.response + CIFS_SESS_KEY_SIZE);
return rc;
}
/*
* Calculate the boot aggregate hash
*/
int __init ima_calc_boot_aggregate(char *digest)
{
u8 pcr_i[IMA_DIGEST_SIZE];
int rc, i;
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(ima_shash_tfm)];
} desc;
desc.shash.tfm = ima_shash_tfm;
desc.shash.flags = 0;
rc = crypto_shash_init(&desc.shash);
if (rc != 0)
return rc;
/* cumulative sha1 over tpm registers 0-7 */
for (i = TPM_PCR0; i < TPM_PCR8; i++) {
ima_pcrread(i, pcr_i);
/* now accumulate with current aggregate */
rc = crypto_shash_update(&desc.shash, pcr_i, IMA_DIGEST_SIZE);
}
if (!rc)
crypto_shash_final(&desc.shash, digest);
return rc;
}
static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
struct TCP_Server_Info *server, char *signature)
{
int i;
int rc;
if (iov == NULL || signature == NULL || server == NULL)
return -EINVAL;
if (!server->secmech.sdescmd5) {
cERROR(1, "%s: Can't generate signature\n", __func__);
return -1;
}
rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
if (rc) {
cERROR(1, "%s: Oould not init md5\n", __func__);
return rc;
}
crypto_shash_update(&server->secmech.sdescmd5->shash,
server->session_key.response, server->session_key.len);
for (i = 0; i < n_vec; i++) {
if (iov[i].iov_len == 0)
continue;
if (iov[i].iov_base == NULL) {
cERROR(1, "null iovec entry");
return -EIO;
}
/* The first entry includes a length field (which does not get
signed that occupies the first 4 bytes before the header */
if (i == 0) {
if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
break; /* nothing to sign or corrupt header */
crypto_shash_update(&server->secmech.sdescmd5->shash,
iov[i].iov_base + 4, iov[i].iov_len - 4);
} else
crypto_shash_update(&server->secmech.sdescmd5->shash,
iov[i].iov_base, iov[i].iov_len);
}
rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
return rc;
}
static int padlock_sha_update(struct shash_desc *desc,
const u8 *data, unsigned int length)
{
struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
return crypto_shash_update(&dctx->fallback, data, length);
}
/*
* Calculate the hash of template data
*/
static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data,
struct ima_template_desc *td,
int num_fields,
struct ima_digest_data *hash,
struct crypto_shash *tfm)
{
SHASH_DESC_ON_STACK(shash, tfm);
int rc, i;
shash->tfm = tfm;
shash->flags = 0;
hash->length = crypto_shash_digestsize(tfm);
rc = crypto_shash_init(shash);
if (rc != 0)
return rc;
for (i = 0; i < num_fields; i++) {
u8 buffer[IMA_EVENT_NAME_LEN_MAX + 1] = { 0 };
u8 *data_to_hash = field_data[i].data;
u32 datalen = field_data[i].len;
u32 datalen_to_hash =
!ima_canonical_fmt ? datalen : cpu_to_le32(datalen);
if (strcmp(td->name, IMA_TEMPLATE_IMA_NAME) != 0) {
rc = crypto_shash_update(shash,
(const u8 *) &datalen_to_hash,
sizeof(datalen_to_hash));
if (rc)
break;
} else if (strcmp(td->fields[i]->field_id, "n") == 0) {
memcpy(buffer, data_to_hash, datalen);
data_to_hash = buffer;
datalen = IMA_EVENT_NAME_LEN_MAX + 1;
}
rc = crypto_shash_update(shash, data_to_hash, datalen);
if (rc)
break;
}
if (!rc)
rc = crypto_shash_final(shash, hash->digest);
return rc;
}
int orinoco_mic(struct crypto_shash *tfm_michael, u8 *key,
u8 *da, u8 *sa, u8 priority,
u8 *data, size_t data_len, u8 *mic)
{
SHASH_DESC_ON_STACK(desc, tfm_michael);
u8 hdr[ETH_HLEN + 2]; /* size of header + padding */
int err;
if (tfm_michael == NULL) {
printk(KERN_WARNING "orinoco_mic: tfm_michael == NULL\n");
return -1;
}
/* Copy header into buffer. We need the padding on the end zeroed */
memcpy(&hdr[0], da, ETH_ALEN);
memcpy(&hdr[ETH_ALEN], sa, ETH_ALEN);
hdr[ETH_ALEN * 2] = priority;
hdr[ETH_ALEN * 2 + 1] = 0;
hdr[ETH_ALEN * 2 + 2] = 0;
hdr[ETH_ALEN * 2 + 3] = 0;
desc->tfm = tfm_michael;
desc->flags = 0;
err = crypto_shash_setkey(tfm_michael, key, MIC_KEYLEN);
if (err)
return err;
err = crypto_shash_init(desc);
if (err)
return err;
err = crypto_shash_update(desc, hdr, sizeof(hdr));
if (err)
return err;
err = crypto_shash_update(desc, data, data_len);
if (err)
return err;
err = crypto_shash_final(desc, mic);
shash_desc_zero(desc);
return err;
}
static int ima_calc_file_hash_tfm(struct file *file,
struct ima_digest_data *hash,
struct crypto_shash *tfm)
{
loff_t i_size, offset = 0;
char *rbuf;
int rc, read = 0;
SHASH_DESC_ON_STACK(shash, tfm);
shash->tfm = tfm;
shash->flags = 0;
hash->length = crypto_shash_digestsize(tfm);
rc = crypto_shash_init(shash);
if (rc != 0)
return rc;
i_size = i_size_read(file_inode(file));
if (i_size == 0)
goto out;
rbuf = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!rbuf)
return -ENOMEM;
if (!(file->f_mode & FMODE_READ)) {
file->f_mode |= FMODE_READ;
read = 1;
}
while (offset < i_size) {
int rbuf_len;
rbuf_len = integrity_kernel_read(file, offset, rbuf, PAGE_SIZE);
if (rbuf_len < 0) {
rc = rbuf_len;
break;
}
if (rbuf_len == 0)
break;
offset += rbuf_len;
rc = crypto_shash_update(shash, rbuf, rbuf_len);
if (rc)
break;
}
if (read)
file->f_mode &= ~FMODE_READ;
kfree(rbuf);
out:
if (!rc)
rc = crypto_shash_final(shash, hash->digest);
return rc;
}
int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
size_t len)
{
SHASH_DESC_ON_STACK(desc, apparmor_tfm);
int error = -ENOMEM;
__le32 le32_version = cpu_to_le32(version);
if (!aa_g_hash_policy)
return 0;
if (!apparmor_tfm)
return 0;
profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
if (!profile->hash)
goto fail;
desc->tfm = apparmor_tfm;
error = crypto_shash_init(desc);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) &le32_version, 4);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) start, len);
if (error)
goto fail;
error = crypto_shash_final(desc, profile->hash);
if (error)
goto fail;
return 0;
fail:
kfree(profile->hash);
profile->hash = NULL;
return error;
}
/*
* 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_calculate_signature(const struct smb_hdr *cifs_pdu,
struct TCP_Server_Info *server, char *signature)
{
int rc;
if (cifs_pdu == NULL || signature == NULL || server == NULL)
return -EINVAL;
if (!server->secmech.sdescmd5) {
cERROR(1, "%s: Can't generate signature\n", __func__);
return -1;
}
rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
if (rc) {
cERROR(1, "%s: Could not init md5\n", __func__);
return rc;
}
rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
server->session_key.response, server->session_key.len);
if (rc) {
cERROR(1, "%s: Could not update with response\n", __func__);
return rc;
}
rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
if (rc) {
cERROR(1, "%s: Could not update with payload\n", __func__);
return rc;
}
rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
if (rc)
cERROR(1, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
/*
* Calculate the MD5/SHA1 file digest
*/
int ima_calc_file_hash(struct file *file, char *digest)
{
loff_t i_size, offset = 0;
char *rbuf;
int rc, read = 0;
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(ima_shash_tfm)];
} desc;
desc.shash.tfm = ima_shash_tfm;
desc.shash.flags = 0;
rc = crypto_shash_init(&desc.shash);
if (rc != 0)
return rc;
rbuf = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!rbuf) {
rc = -ENOMEM;
goto out;
}
if (!(file->f_mode & FMODE_READ)) {
file->f_mode |= FMODE_READ;
read = 1;
}
i_size = i_size_read(file->f_dentry->d_inode);
while (offset < i_size) {
int rbuf_len;
rbuf_len = kernel_read(file, offset, rbuf, PAGE_SIZE);
if (rbuf_len < 0) {
rc = rbuf_len;
break;
}
if (rbuf_len == 0)
break;
offset += rbuf_len;
rc = crypto_shash_update(&desc.shash, rbuf, rbuf_len);
if (rc)
break;
}
kfree(rbuf);
if (!rc)
rc = crypto_shash_final(&desc.shash, digest);
if (read)
file->f_mode &= ~FMODE_READ;
out:
return rc;
}
/* Protect against 'cutting & pasting' security.evm xattr, include inode
* specific info.
*
* (Additional directory/file metadata needs to be added for more complete
* protection.)
*/
static void hmac_add_misc(struct shash_desc *desc, struct inode *inode,
char *digest)
{
struct h_misc {
unsigned long ino;
__u32 generation;
uid_t uid;
gid_t gid;
umode_t mode;
} hmac_misc;
memset(&hmac_misc, 0, sizeof(hmac_misc));
hmac_misc.ino = inode->i_ino;
hmac_misc.generation = inode->i_generation;
hmac_misc.uid = from_kuid(&init_user_ns, inode->i_uid);
hmac_misc.gid = from_kgid(&init_user_ns, inode->i_gid);
hmac_misc.mode = inode->i_mode;
crypto_shash_update(desc, (const u8 *)&hmac_misc, sizeof(hmac_misc));
if (evm_hmac_version > 1)
crypto_shash_update(desc, inode->i_sb->s_uuid,
sizeof(inode->i_sb->s_uuid));
crypto_shash_final(desc, digest);
}
u32 crc32c(u32 crc, const void *address, unsigned int length)
{
SHASH_DESC_ON_STACK(shash, tfm);
u32 *ctx = (u32 *)shash_desc_ctx(shash);
int err;
shash->tfm = tfm;
shash->flags = 0;
*ctx = crc;
err = crypto_shash_update(shash, address, length);
BUG_ON(err);
return *ctx;
}
int evm_init_hmac(struct inode *inode, const struct xattr *lsm_xattr,
char *hmac_val)
{
struct shash_desc *desc;
desc = init_desc();
if (IS_ERR(desc)) {
printk(KERN_INFO "init_desc failed\n");
return PTR_ERR(desc);
}
crypto_shash_update(desc, lsm_xattr->value, lsm_xattr->value_len);
hmac_add_misc(desc, inode, hmac_val);
kfree(desc);
return 0;
}
/*
* calculate authorization info fields to send to TPM
*/
static int TSS_authhmac(unsigned char *digest, const unsigned char *key,
unsigned int keylen, unsigned char *h1,
unsigned char *h2, unsigned char h3, ...)
{
unsigned char paramdigest[SHA1_DIGEST_SIZE];
struct sdesc *sdesc;
unsigned int dlen;
unsigned char *data;
unsigned char c;
int ret;
va_list argp;
sdesc = init_sdesc(hashalg);
if (IS_ERR(sdesc)) {
pr_info("trusted_key: can't alloc %s\n", hash_alg);
return PTR_ERR(sdesc);
}
c = h3;
ret = crypto_shash_init(&sdesc->shash);
if (ret < 0)
goto out;
va_start(argp, h3);
for (;;) {
dlen = va_arg(argp, unsigned int);
if (dlen == 0)
break;
data = va_arg(argp, unsigned char *);
if (!data) {
ret = -EINVAL;
break;
}
ret = crypto_shash_update(&sdesc->shash, data, dlen);
if (ret < 0)
break;
}
va_end(argp);
if (!ret)
ret = crypto_shash_final(&sdesc->shash, paramdigest);
if (!ret)
ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE,
paramdigest, TPM_NONCE_SIZE, h1,
TPM_NONCE_SIZE, h2, 1, &c, 0, 0);
out:
kfree(sdesc);
return ret;
}
__u16 crc_t10dif(const unsigned char *buffer, size_t len)
{
struct {
struct shash_desc shash;
char ctx[2];
} desc;
int err;
desc.shash.tfm = crct10dif_tfm;
desc.shash.flags = 0;
*(__u16 *)desc.ctx = 0;
err = crypto_shash_update(&desc.shash, buffer, len);
BUG_ON(err);
return *(__u16 *)desc.ctx;
}
u32 crc32c(u32 crc, const void *address, unsigned int length)
{
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(tfm)];
} desc;
int err;
desc.shash.tfm = tfm;
desc.shash.flags = 0;
*(u32 *)desc.ctx = crc;
err = crypto_shash_update(&desc.shash, address, length);
BUG_ON(err);
return *(u32 *)desc.ctx;
}
static int
CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
{
int rc;
unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
if (!ses->server->secmech.sdeschmacmd5) {
cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
return -1;
}
rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
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.sdeschmacmd5->shash);
if (rc) {
cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
return rc;
}
if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
memcpy(ses->auth_key.response + offset,
ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
else
memcpy(ses->auth_key.response + offset,
ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
ses->auth_key.response + offset, ses->auth_key.len - offset);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
return rc;
}
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
ses->auth_key.response + CIFS_SESS_KEY_SIZE);
if (rc)
cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
static int p8_ghash_update(struct shash_desc *desc,
const u8 *src, unsigned int srclen)
{
unsigned int len;
struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(desc->tfm));
struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
if (IN_INTERRUPT) {
return crypto_shash_update(&dctx->fallback_desc, src, srclen);
} else {
if (dctx->bytes) {
if (dctx->bytes + srclen < GHASH_DIGEST_SIZE) {
memcpy(dctx->buffer + dctx->bytes, src, srclen);
dctx->bytes += srclen;
return 0;
}
memcpy(dctx->buffer + dctx->bytes, src,
GHASH_DIGEST_SIZE - dctx->bytes);
pagefault_disable();
enable_kernel_altivec();
enable_kernel_fp();
gcm_ghash_p8(dctx->shash, ctx->htable, dctx->buffer,
GHASH_DIGEST_SIZE);
pagefault_enable();
src += GHASH_DIGEST_SIZE - dctx->bytes;
srclen -= GHASH_DIGEST_SIZE - dctx->bytes;
dctx->bytes = 0;
}
len = srclen & ~(GHASH_DIGEST_SIZE - 1);
if (len) {
pagefault_disable();
enable_kernel_altivec();
enable_kernel_fp();
gcm_ghash_p8(dctx->shash, ctx->htable, src, len);
pagefault_enable();
src += len;
srclen -= len;
}
if (srclen) {
memcpy(dctx->buffer, src, srclen);
dctx->bytes = srclen;
}
return 0;
}
}
static int
symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash)
{
int rc;
unsigned int size;
struct crypto_shash *md5;
struct sdesc *sdescmd5;
md5 = crypto_alloc_shash("md5", 0, 0);
if (IS_ERR(md5)) {
rc = PTR_ERR(md5);
cERROR(1, "%s: Crypto md5 allocation error %d\n", __func__, rc);
return rc;
}
size = sizeof(struct shash_desc) + crypto_shash_descsize(md5);
sdescmd5 = kmalloc(size, GFP_KERNEL);
if (!sdescmd5) {
rc = -ENOMEM;
cERROR(1, "%s: Memory allocation failure\n", __func__);
goto symlink_hash_err;
}
sdescmd5->shash.tfm = md5;
sdescmd5->shash.flags = 0x0;
rc = crypto_shash_init(&sdescmd5->shash);
if (rc) {
cERROR(1, "%s: Could not init md5 shash\n", __func__);
goto symlink_hash_err;
}
rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len);
if (rc) {
cERROR(1, "%s: Could not update iwth link_str\n", __func__);
goto symlink_hash_err;
}
rc = crypto_shash_final(&sdescmd5->shash, md5_hash);
if (rc)
cERROR(1, "%s: Could not generate md5 hash\n", __func__);
symlink_hash_err:
crypto_free_shash(md5);
kfree(sdescmd5);
return rc;
}
static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
unsigned int keylen, ...)
{
struct sdesc *sdesc;
va_list argp;
unsigned int dlen;
unsigned char *data;
int ret;
sdesc = init_sdesc(hmacalg);
if (IS_ERR(sdesc)) {
pr_info("trusted_key: can't alloc %s\n", hmac_alg);
return PTR_ERR(sdesc);
}
ret = crypto_shash_setkey(hmacalg, key, keylen);
if (ret < 0)
goto out;
ret = crypto_shash_init(&sdesc->shash);
if (ret < 0)
goto out;
va_start(argp, keylen);
for (;;) {
dlen = va_arg(argp, unsigned int);
if (dlen == 0)
break;
data = va_arg(argp, unsigned char *);
if (data == NULL) {
ret = -EINVAL;
break;
}
ret = crypto_shash_update(&sdesc->shash, data, dlen);
if (ret < 0)
break;
}
va_end(argp);
if (!ret)
ret = crypto_shash_final(&sdesc->shash, digest);
out:
kfree(sdesc);
return ret;
}
static int crypt_iv_tcw_whitening(struct crypt_config *cc,
struct dm_crypt_request *dmreq,
u8 *data)
{
struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
u64 sector = cpu_to_le64((u64)dmreq->iv_sector);
u8 buf[TCW_WHITENING_SIZE];
struct {
struct shash_desc desc;
char ctx[crypto_shash_descsize(tcw->crc32_tfm)];
} sdesc;
int i, r;
/* xor whitening with sector number */
memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE);
crypto_xor(buf, (u8 *)§or, 8);
crypto_xor(&buf[8], (u8 *)§or, 8);
/* calculate crc32 for every 32bit part and xor it */
sdesc.desc.tfm = tcw->crc32_tfm;
sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
for (i = 0; i < 4; i++) {
r = crypto_shash_init(&sdesc.desc);
if (r)
goto out;
r = crypto_shash_update(&sdesc.desc, &buf[i * 4], 4);
if (r)
goto out;
r = crypto_shash_final(&sdesc.desc, &buf[i * 4]);
if (r)
goto out;
}
crypto_xor(&buf[0], &buf[12], 4);
crypto_xor(&buf[4], &buf[8], 4);
/* apply whitening (8 bytes) to whole sector */
for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
crypto_xor(data + i * 8, buf, 8);
out:
memzero_explicit(buf, sizeof(buf));
return r;
}
/* Protect against 'cutting & pasting' security.evm xattr, include inode
* specific info.
*
* (Additional directory/file metadata needs to be added for more complete
* protection.)
*/
static void hmac_add_misc(struct shash_desc *desc, struct inode *inode,
char *digest)
{
struct h_misc {
unsigned long ino;
__u32 generation;
uid_t uid;
gid_t gid;
umode_t mode;
} hmac_misc;
memset(&hmac_misc, 0, sizeof hmac_misc);
hmac_misc.ino = inode->i_ino;
hmac_misc.generation = inode->i_generation;
hmac_misc.uid = inode->i_uid;
hmac_misc.gid = inode->i_gid;
hmac_misc.mode = inode->i_mode;
crypto_shash_update(desc, (const u8 *)&hmac_misc, sizeof hmac_misc);
crypto_shash_final(desc, digest);
}
/* produce a md4 message digest from data of length n bytes */
int
mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
{
int rc;
unsigned int size;
struct crypto_shash *md4;
struct sdesc *sdescmd4;
md4 = crypto_alloc_shash("md4", 0, 0);
if (IS_ERR(md4)) {
cERROR(1, "%s: Crypto md4 allocation error %d\n", __func__, rc);
return PTR_ERR(md4);
}
size = sizeof(struct shash_desc) + crypto_shash_descsize(md4);
sdescmd4 = kmalloc(size, GFP_KERNEL);
if (!sdescmd4) {
rc = -ENOMEM;
cERROR(1, "%s: Memory allocation failure\n", __func__);
goto mdfour_err;
}
sdescmd4->shash.tfm = md4;
sdescmd4->shash.flags = 0x0;
rc = crypto_shash_init(&sdescmd4->shash);
if (rc) {
cERROR(1, "%s: Could not init md4 shash\n", __func__);
goto mdfour_err;
}
crypto_shash_update(&sdescmd4->shash, link_str, link_len);
rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
mdfour_err:
crypto_free_shash(md4);
kfree(sdescmd4);
return rc;
}
/*
* Calculate the boot aggregate hash
*/
static int __init ima_calc_boot_aggregate_tfm(char *digest,
struct crypto_shash *tfm)
{
u8 pcr_i[TPM_DIGEST_SIZE];
int rc, i;
SHASH_DESC_ON_STACK(shash, tfm);
shash->tfm = tfm;
shash->flags = 0;
rc = crypto_shash_init(shash);
if (rc != 0)
return rc;
/* cumulative sha1 over tpm registers 0-7 */
for (i = TPM_PCR0; i < TPM_PCR8; i++) {
ima_pcrread(i, pcr_i);
/* now accumulate with current aggregate */
rc = crypto_shash_update(shash, pcr_i, TPM_DIGEST_SIZE);
}
if (!rc)
crypto_shash_final(shash, digest);
return rc;
}
static int qat_alg_do_precomputes(struct icp_qat_hw_auth_algo_blk *hash,
struct qat_alg_aead_ctx *ctx,
const uint8_t *auth_key,
unsigned int auth_keylen)
{
SHASH_DESC_ON_STACK(shash, ctx->hash_tfm);
int block_size = crypto_shash_blocksize(ctx->hash_tfm);
int digest_size = crypto_shash_digestsize(ctx->hash_tfm);
__be32 *hash_state_out;
__be64 *hash512_state_out;
int i, offset;
memset(ctx->ipad, 0, block_size);
memset(ctx->opad, 0, block_size);
shash->tfm = ctx->hash_tfm;
shash->flags = 0x0;
if (auth_keylen > block_size) {
int ret = crypto_shash_digest(shash, auth_key,
auth_keylen, ctx->ipad);
if (ret)
return ret;
memcpy(ctx->opad, ctx->ipad, digest_size);
} else {
memcpy(ctx->ipad, auth_key, auth_keylen);
memcpy(ctx->opad, auth_key, auth_keylen);
}
for (i = 0; i < block_size; i++) {
char *ipad_ptr = ctx->ipad + i;
char *opad_ptr = ctx->opad + i;
*ipad_ptr ^= HMAC_IPAD_VALUE;
*opad_ptr ^= HMAC_OPAD_VALUE;
}
if (crypto_shash_init(shash))
return -EFAULT;
if (crypto_shash_update(shash, ctx->ipad, block_size))
return -EFAULT;
hash_state_out = (__be32 *)hash->sha.state1;
hash512_state_out = (__be64 *)hash_state_out;
switch (ctx->qat_hash_alg) {
case ICP_QAT_HW_AUTH_ALGO_SHA1:
if (crypto_shash_export(shash, &ctx->sha1))
return -EFAULT;
for (i = 0; i < digest_size >> 2; i++, hash_state_out++)
*hash_state_out = cpu_to_be32(ctx->sha1.state[i]);
break;
case ICP_QAT_HW_AUTH_ALGO_SHA256:
if (crypto_shash_export(shash, &ctx->sha256))
return -EFAULT;
for (i = 0; i < digest_size >> 2; i++, hash_state_out++)
*hash_state_out = cpu_to_be32(ctx->sha256.state[i]);
break;
case ICP_QAT_HW_AUTH_ALGO_SHA512:
if (crypto_shash_export(shash, &ctx->sha512))
return -EFAULT;
for (i = 0; i < digest_size >> 3; i++, hash512_state_out++)
*hash512_state_out = cpu_to_be64(ctx->sha512.state[i]);
break;
default:
return -EFAULT;
}
if (crypto_shash_init(shash))
return -EFAULT;
if (crypto_shash_update(shash, ctx->opad, block_size))
return -EFAULT;
offset = round_up(qat_get_inter_state_size(ctx->qat_hash_alg), 8);
hash_state_out = (__be32 *)(hash->sha.state1 + offset);
hash512_state_out = (__be64 *)hash_state_out;
switch (ctx->qat_hash_alg) {
case ICP_QAT_HW_AUTH_ALGO_SHA1:
if (crypto_shash_export(shash, &ctx->sha1))
return -EFAULT;
for (i = 0; i < digest_size >> 2; i++, hash_state_out++)
*hash_state_out = cpu_to_be32(ctx->sha1.state[i]);
break;
case ICP_QAT_HW_AUTH_ALGO_SHA256:
if (crypto_shash_export(shash, &ctx->sha256))
return -EFAULT;
for (i = 0; i < digest_size >> 2; i++, hash_state_out++)
*hash_state_out = cpu_to_be32(ctx->sha256.state[i]);
break;
case ICP_QAT_HW_AUTH_ALGO_SHA512:
if (crypto_shash_export(shash, &ctx->sha512))
return -EFAULT;
for (i = 0; i < digest_size >> 3; i++, hash512_state_out++)
*hash512_state_out = cpu_to_be64(ctx->sha512.state[i]);
break;
default:
return -EFAULT;
}
memzero_explicit(ctx->ipad, block_size);
memzero_explicit(ctx->opad, block_size);
return 0;
}
