linux/drivers/s390/crypto/pkey_api.c
Ingo Franzki ebb7c695d3 pkey: Indicate old mkvp only if old and current mkvp are different
When the CCA master key is set twice with the same master key,
then the old and the current master key are the same and thus the
verification patterns are the same, too. The check to report if a
secure key is currently wrapped by the old master key erroneously
reports old mkvp in this case.

Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2019-02-21 15:57:23 +01:00

1724 lines
43 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* pkey device driver
*
* Copyright IBM Corp. 2017
* Author(s): Harald Freudenberger
*/
#define KMSG_COMPONENT "pkey"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/kallsyms.h>
#include <linux/debugfs.h>
#include <linux/random.h>
#include <linux/cpufeature.h>
#include <asm/zcrypt.h>
#include <asm/cpacf.h>
#include <asm/pkey.h>
#include <crypto/aes.h>
#include "zcrypt_api.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("s390 protected key interface");
/* Size of parameter block used for all cca requests/replies */
#define PARMBSIZE 512
/* Size of vardata block used for some of the cca requests/replies */
#define VARDATASIZE 4096
/* mask of available pckmo subfunctions, fetched once at module init */
static cpacf_mask_t pckmo_functions;
/*
* debug feature data and functions
*/
static debug_info_t *debug_info;
#define DEBUG_DBG(...) debug_sprintf_event(debug_info, 6, ##__VA_ARGS__)
#define DEBUG_INFO(...) debug_sprintf_event(debug_info, 5, ##__VA_ARGS__)
#define DEBUG_WARN(...) debug_sprintf_event(debug_info, 4, ##__VA_ARGS__)
#define DEBUG_ERR(...) debug_sprintf_event(debug_info, 3, ##__VA_ARGS__)
static void __init pkey_debug_init(void)
{
debug_info = debug_register("pkey", 1, 1, 4 * sizeof(long));
debug_register_view(debug_info, &debug_sprintf_view);
debug_set_level(debug_info, 3);
}
static void __exit pkey_debug_exit(void)
{
debug_unregister(debug_info);
}
/* Key token types */
#define TOKTYPE_NON_CCA 0x00 /* Non-CCA key token */
#define TOKTYPE_CCA_INTERNAL 0x01 /* CCA internal key token */
/* For TOKTYPE_NON_CCA: */
#define TOKVER_PROTECTED_KEY 0x01 /* Protected key token */
/* For TOKTYPE_CCA_INTERNAL: */
#define TOKVER_CCA_AES 0x04 /* CCA AES key token */
/* header part of a key token */
struct keytoken_header {
u8 type; /* one of the TOKTYPE values */
u8 res0[3];
u8 version; /* one of the TOKVER values */
u8 res1[3];
} __packed;
/* inside view of a secure key token (only type 0x01 version 0x04) */
struct secaeskeytoken {
u8 type; /* 0x01 for internal key token */
u8 res0[3];
u8 version; /* should be 0x04 */
u8 res1[1];
u8 flag; /* key flags */
u8 res2[1];
u64 mkvp; /* master key verification pattern */
u8 key[32]; /* key value (encrypted) */
u8 cv[8]; /* control vector */
u16 bitsize; /* key bit size */
u16 keysize; /* key byte size */
u8 tvv[4]; /* token validation value */
} __packed;
/* inside view of a protected key token (only type 0x00 version 0x01) */
struct protaeskeytoken {
u8 type; /* 0x00 for PAES specific key tokens */
u8 res0[3];
u8 version; /* should be 0x01 for protected AES key token */
u8 res1[3];
u32 keytype; /* key type, one of the PKEY_KEYTYPE values */
u32 len; /* bytes actually stored in protkey[] */
u8 protkey[MAXPROTKEYSIZE]; /* the protected key blob */
} __packed;
/*
* Simple check if the token is a valid CCA secure AES key
* token. If keybitsize is given, the bitsize of the key is
* also checked. Returns 0 on success or errno value on failure.
*/
static int check_secaeskeytoken(const u8 *token, int keybitsize)
{
struct secaeskeytoken *t = (struct secaeskeytoken *) token;
if (t->type != TOKTYPE_CCA_INTERNAL) {
DEBUG_ERR(
"%s secure token check failed, type mismatch 0x%02x != 0x%02x\n",
__func__, (int) t->type, TOKTYPE_CCA_INTERNAL);
return -EINVAL;
}
if (t->version != TOKVER_CCA_AES) {
DEBUG_ERR(
"%s secure token check failed, version mismatch 0x%02x != 0x%02x\n",
__func__, (int) t->version, TOKVER_CCA_AES);
return -EINVAL;
}
if (keybitsize > 0 && t->bitsize != keybitsize) {
DEBUG_ERR(
"%s secure token check failed, bitsize mismatch %d != %d\n",
__func__, (int) t->bitsize, keybitsize);
return -EINVAL;
}
return 0;
}
/*
* Allocate consecutive memory for request CPRB, request param
* block, reply CPRB and reply param block and fill in values
* for the common fields. Returns 0 on success or errno value
* on failure.
*/
static int alloc_and_prep_cprbmem(size_t paramblen,
u8 **pcprbmem,
struct CPRBX **preqCPRB,
struct CPRBX **prepCPRB)
{
u8 *cprbmem;
size_t cprbplusparamblen = sizeof(struct CPRBX) + paramblen;
struct CPRBX *preqcblk, *prepcblk;
/*
* allocate consecutive memory for request CPRB, request param
* block, reply CPRB and reply param block
*/
cprbmem = kcalloc(2, cprbplusparamblen, GFP_KERNEL);
if (!cprbmem)
return -ENOMEM;
preqcblk = (struct CPRBX *) cprbmem;
prepcblk = (struct CPRBX *) (cprbmem + cprbplusparamblen);
/* fill request cprb struct */
preqcblk->cprb_len = sizeof(struct CPRBX);
preqcblk->cprb_ver_id = 0x02;
memcpy(preqcblk->func_id, "T2", 2);
preqcblk->rpl_msgbl = cprbplusparamblen;
if (paramblen) {
preqcblk->req_parmb =
((u8 *) preqcblk) + sizeof(struct CPRBX);
preqcblk->rpl_parmb =
((u8 *) prepcblk) + sizeof(struct CPRBX);
}
*pcprbmem = cprbmem;
*preqCPRB = preqcblk;
*prepCPRB = prepcblk;
return 0;
}
/*
* Free the cprb memory allocated with the function above.
* If the scrub value is not zero, the memory is filled
* with zeros before freeing (useful if there was some
* clear key material in there).
*/
static void free_cprbmem(void *mem, size_t paramblen, int scrub)
{
if (scrub)
memzero_explicit(mem, 2 * (sizeof(struct CPRBX) + paramblen));
kfree(mem);
}
/*
* Helper function to prepare the xcrb struct
*/
static inline void prep_xcrb(struct ica_xcRB *pxcrb,
u16 cardnr,
struct CPRBX *preqcblk,
struct CPRBX *prepcblk)
{
memset(pxcrb, 0, sizeof(*pxcrb));
pxcrb->agent_ID = 0x4341; /* 'CA' */
pxcrb->user_defined = (cardnr == 0xFFFF ? AUTOSELECT : cardnr);
pxcrb->request_control_blk_length =
preqcblk->cprb_len + preqcblk->req_parml;
pxcrb->request_control_blk_addr = (void __user *) preqcblk;
pxcrb->reply_control_blk_length = preqcblk->rpl_msgbl;
pxcrb->reply_control_blk_addr = (void __user *) prepcblk;
}
/*
* Helper function which calls zcrypt_send_cprb with
* memory management segment adjusted to kernel space
* so that the copy_from_user called within this
* function do in fact copy from kernel space.
*/
static inline int _zcrypt_send_cprb(struct ica_xcRB *xcrb)
{
int rc;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
rc = zcrypt_send_cprb(xcrb);
set_fs(old_fs);
return rc;
}
/*
* Generate (random) AES secure key.
*/
int pkey_genseckey(u16 cardnr, u16 domain,
u32 keytype, struct pkey_seckey *seckey)
{
int i, rc, keysize;
int seckeysize;
u8 *mem;
struct CPRBX *preqcblk, *prepcblk;
struct ica_xcRB xcrb;
struct kgreqparm {
u8 subfunc_code[2];
u16 rule_array_len;
struct lv1 {
u16 len;
char key_form[8];
char key_length[8];
char key_type1[8];
char key_type2[8];
} lv1;
struct lv2 {
u16 len;
struct keyid {
u16 len;
u16 attr;
u8 data[SECKEYBLOBSIZE];
} keyid[6];
} lv2;
} *preqparm;
struct kgrepparm {
u8 subfunc_code[2];
u16 rule_array_len;
struct lv3 {
u16 len;
u16 keyblocklen;
struct {
u16 toklen;
u16 tokattr;
u8 tok[0];
/* ... some more data ... */
} keyblock;
} lv3;
} *prepparm;
/* get already prepared memory for 2 cprbs with param block each */
rc = alloc_and_prep_cprbmem(PARMBSIZE, &mem, &preqcblk, &prepcblk);
if (rc)
return rc;
/* fill request cprb struct */
preqcblk->domain = domain;
/* fill request cprb param block with KG request */
preqparm = (struct kgreqparm *) preqcblk->req_parmb;
memcpy(preqparm->subfunc_code, "KG", 2);
preqparm->rule_array_len = sizeof(preqparm->rule_array_len);
preqparm->lv1.len = sizeof(struct lv1);
memcpy(preqparm->lv1.key_form, "OP ", 8);
switch (keytype) {
case PKEY_KEYTYPE_AES_128:
keysize = 16;
memcpy(preqparm->lv1.key_length, "KEYLN16 ", 8);
break;
case PKEY_KEYTYPE_AES_192:
keysize = 24;
memcpy(preqparm->lv1.key_length, "KEYLN24 ", 8);
break;
case PKEY_KEYTYPE_AES_256:
keysize = 32;
memcpy(preqparm->lv1.key_length, "KEYLN32 ", 8);
break;
default:
DEBUG_ERR(
"%s unknown/unsupported keytype %d\n",
__func__, keytype);
rc = -EINVAL;
goto out;
}
memcpy(preqparm->lv1.key_type1, "AESDATA ", 8);
preqparm->lv2.len = sizeof(struct lv2);
for (i = 0; i < 6; i++) {
preqparm->lv2.keyid[i].len = sizeof(struct keyid);
preqparm->lv2.keyid[i].attr = (i == 2 ? 0x30 : 0x10);
}
preqcblk->req_parml = sizeof(struct kgreqparm);
/* fill xcrb struct */
prep_xcrb(&xcrb, cardnr, preqcblk, prepcblk);
/* forward xcrb with request CPRB and reply CPRB to zcrypt dd */
rc = _zcrypt_send_cprb(&xcrb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n",
__func__, (int) cardnr, (int) domain, rc);
goto out;
}
/* check response returncode and reasoncode */
if (prepcblk->ccp_rtcode != 0) {
DEBUG_ERR(
"%s secure key generate failure, card response %d/%d\n",
__func__,
(int) prepcblk->ccp_rtcode,
(int) prepcblk->ccp_rscode);
rc = -EIO;
goto out;
}
/* process response cprb param block */
prepcblk->rpl_parmb = ((u8 *) prepcblk) + sizeof(struct CPRBX);
prepparm = (struct kgrepparm *) prepcblk->rpl_parmb;
/* check length of the returned secure key token */
seckeysize = prepparm->lv3.keyblock.toklen
- sizeof(prepparm->lv3.keyblock.toklen)
- sizeof(prepparm->lv3.keyblock.tokattr);
if (seckeysize != SECKEYBLOBSIZE) {
DEBUG_ERR(
"%s secure token size mismatch %d != %d bytes\n",
__func__, seckeysize, SECKEYBLOBSIZE);
rc = -EIO;
goto out;
}
/* check secure key token */
rc = check_secaeskeytoken(prepparm->lv3.keyblock.tok, 8*keysize);
if (rc) {
rc = -EIO;
goto out;
}
/* copy the generated secure key token */
memcpy(seckey->seckey, prepparm->lv3.keyblock.tok, SECKEYBLOBSIZE);
out:
free_cprbmem(mem, PARMBSIZE, 0);
return rc;
}
EXPORT_SYMBOL(pkey_genseckey);
/*
* Generate an AES secure key with given key value.
*/
int pkey_clr2seckey(u16 cardnr, u16 domain, u32 keytype,
const struct pkey_clrkey *clrkey,
struct pkey_seckey *seckey)
{
int rc, keysize, seckeysize;
u8 *mem;
struct CPRBX *preqcblk, *prepcblk;
struct ica_xcRB xcrb;
struct cmreqparm {
u8 subfunc_code[2];
u16 rule_array_len;
char rule_array[8];
struct lv1 {
u16 len;
u8 clrkey[0];
} lv1;
struct lv2 {
u16 len;
struct keyid {
u16 len;
u16 attr;
u8 data[SECKEYBLOBSIZE];
} keyid;
} lv2;
} *preqparm;
struct lv2 *plv2;
struct cmrepparm {
u8 subfunc_code[2];
u16 rule_array_len;
struct lv3 {
u16 len;
u16 keyblocklen;
struct {
u16 toklen;
u16 tokattr;
u8 tok[0];
/* ... some more data ... */
} keyblock;
} lv3;
} *prepparm;
/* get already prepared memory for 2 cprbs with param block each */
rc = alloc_and_prep_cprbmem(PARMBSIZE, &mem, &preqcblk, &prepcblk);
if (rc)
return rc;
/* fill request cprb struct */
preqcblk->domain = domain;
/* fill request cprb param block with CM request */
preqparm = (struct cmreqparm *) preqcblk->req_parmb;
memcpy(preqparm->subfunc_code, "CM", 2);
memcpy(preqparm->rule_array, "AES ", 8);
preqparm->rule_array_len =
sizeof(preqparm->rule_array_len) + sizeof(preqparm->rule_array);
switch (keytype) {
case PKEY_KEYTYPE_AES_128:
keysize = 16;
break;
case PKEY_KEYTYPE_AES_192:
keysize = 24;
break;
case PKEY_KEYTYPE_AES_256:
keysize = 32;
break;
default:
DEBUG_ERR(
"%s unknown/unsupported keytype %d\n",
__func__, keytype);
rc = -EINVAL;
goto out;
}
preqparm->lv1.len = sizeof(struct lv1) + keysize;
memcpy(preqparm->lv1.clrkey, clrkey->clrkey, keysize);
plv2 = (struct lv2 *) (((u8 *) &preqparm->lv2) + keysize);
plv2->len = sizeof(struct lv2);
plv2->keyid.len = sizeof(struct keyid);
plv2->keyid.attr = 0x30;
preqcblk->req_parml = sizeof(struct cmreqparm) + keysize;
/* fill xcrb struct */
prep_xcrb(&xcrb, cardnr, preqcblk, prepcblk);
/* forward xcrb with request CPRB and reply CPRB to zcrypt dd */
rc = _zcrypt_send_cprb(&xcrb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n",
__func__, (int) cardnr, (int) domain, rc);
goto out;
}
/* check response returncode and reasoncode */
if (prepcblk->ccp_rtcode != 0) {
DEBUG_ERR(
"%s clear key import failure, card response %d/%d\n",
__func__,
(int) prepcblk->ccp_rtcode,
(int) prepcblk->ccp_rscode);
rc = -EIO;
goto out;
}
/* process response cprb param block */
prepcblk->rpl_parmb = ((u8 *) prepcblk) + sizeof(struct CPRBX);
prepparm = (struct cmrepparm *) prepcblk->rpl_parmb;
/* check length of the returned secure key token */
seckeysize = prepparm->lv3.keyblock.toklen
- sizeof(prepparm->lv3.keyblock.toklen)
- sizeof(prepparm->lv3.keyblock.tokattr);
if (seckeysize != SECKEYBLOBSIZE) {
DEBUG_ERR(
"%s secure token size mismatch %d != %d bytes\n",
__func__, seckeysize, SECKEYBLOBSIZE);
rc = -EIO;
goto out;
}
/* check secure key token */
rc = check_secaeskeytoken(prepparm->lv3.keyblock.tok, 8*keysize);
if (rc) {
rc = -EIO;
goto out;
}
/* copy the generated secure key token */
memcpy(seckey->seckey, prepparm->lv3.keyblock.tok, SECKEYBLOBSIZE);
out:
free_cprbmem(mem, PARMBSIZE, 1);
return rc;
}
EXPORT_SYMBOL(pkey_clr2seckey);
/*
* Derive a proteced key from the secure key blob.
*/
int pkey_sec2protkey(u16 cardnr, u16 domain,
const struct pkey_seckey *seckey,
struct pkey_protkey *protkey)
{
int rc;
u8 *mem;
struct CPRBX *preqcblk, *prepcblk;
struct ica_xcRB xcrb;
struct uskreqparm {
u8 subfunc_code[2];
u16 rule_array_len;
struct lv1 {
u16 len;
u16 attr_len;
u16 attr_flags;
} lv1;
struct lv2 {
u16 len;
u16 attr_len;
u16 attr_flags;
u8 token[0]; /* cca secure key token */
} lv2 __packed;
} *preqparm;
struct uskrepparm {
u8 subfunc_code[2];
u16 rule_array_len;
struct lv3 {
u16 len;
u16 attr_len;
u16 attr_flags;
struct cpacfkeyblock {
u8 version; /* version of this struct */
u8 flags[2];
u8 algo;
u8 form;
u8 pad1[3];
u16 keylen;
u8 key[64]; /* the key (keylen bytes) */
u16 keyattrlen;
u8 keyattr[32];
u8 pad2[1];
u8 vptype;
u8 vp[32]; /* verification pattern */
} keyblock;
} lv3 __packed;
} *prepparm;
/* get already prepared memory for 2 cprbs with param block each */
rc = alloc_and_prep_cprbmem(PARMBSIZE, &mem, &preqcblk, &prepcblk);
if (rc)
return rc;
/* fill request cprb struct */
preqcblk->domain = domain;
/* fill request cprb param block with USK request */
preqparm = (struct uskreqparm *) preqcblk->req_parmb;
memcpy(preqparm->subfunc_code, "US", 2);
preqparm->rule_array_len = sizeof(preqparm->rule_array_len);
preqparm->lv1.len = sizeof(struct lv1);
preqparm->lv1.attr_len = sizeof(struct lv1) - sizeof(preqparm->lv1.len);
preqparm->lv1.attr_flags = 0x0001;
preqparm->lv2.len = sizeof(struct lv2) + SECKEYBLOBSIZE;
preqparm->lv2.attr_len = sizeof(struct lv2)
- sizeof(preqparm->lv2.len) + SECKEYBLOBSIZE;
preqparm->lv2.attr_flags = 0x0000;
memcpy(preqparm->lv2.token, seckey->seckey, SECKEYBLOBSIZE);
preqcblk->req_parml = sizeof(struct uskreqparm) + SECKEYBLOBSIZE;
/* fill xcrb struct */
prep_xcrb(&xcrb, cardnr, preqcblk, prepcblk);
/* forward xcrb with request CPRB and reply CPRB to zcrypt dd */
rc = _zcrypt_send_cprb(&xcrb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n",
__func__, (int) cardnr, (int) domain, rc);
goto out;
}
/* check response returncode and reasoncode */
if (prepcblk->ccp_rtcode != 0) {
DEBUG_ERR(
"%s unwrap secure key failure, card response %d/%d\n",
__func__,
(int) prepcblk->ccp_rtcode,
(int) prepcblk->ccp_rscode);
rc = -EIO;
goto out;
}
if (prepcblk->ccp_rscode != 0) {
DEBUG_WARN(
"%s unwrap secure key warning, card response %d/%d\n",
__func__,
(int) prepcblk->ccp_rtcode,
(int) prepcblk->ccp_rscode);
}
/* process response cprb param block */
prepcblk->rpl_parmb = ((u8 *) prepcblk) + sizeof(struct CPRBX);
prepparm = (struct uskrepparm *) prepcblk->rpl_parmb;
/* check the returned keyblock */
if (prepparm->lv3.keyblock.version != 0x01) {
DEBUG_ERR(
"%s reply param keyblock version mismatch 0x%02x != 0x01\n",
__func__, (int) prepparm->lv3.keyblock.version);
rc = -EIO;
goto out;
}
/* copy the tanslated protected key */
switch (prepparm->lv3.keyblock.keylen) {
case 16+32:
protkey->type = PKEY_KEYTYPE_AES_128;
break;
case 24+32:
protkey->type = PKEY_KEYTYPE_AES_192;
break;
case 32+32:
protkey->type = PKEY_KEYTYPE_AES_256;
break;
default:
DEBUG_ERR("%s unknown/unsupported keytype %d\n",
__func__, prepparm->lv3.keyblock.keylen);
rc = -EIO;
goto out;
}
protkey->len = prepparm->lv3.keyblock.keylen;
memcpy(protkey->protkey, prepparm->lv3.keyblock.key, protkey->len);
out:
free_cprbmem(mem, PARMBSIZE, 0);
return rc;
}
EXPORT_SYMBOL(pkey_sec2protkey);
/*
* Create a protected key from a clear key value.
*/
int pkey_clr2protkey(u32 keytype,
const struct pkey_clrkey *clrkey,
struct pkey_protkey *protkey)
{
long fc;
int keysize;
u8 paramblock[64];
switch (keytype) {
case PKEY_KEYTYPE_AES_128:
keysize = 16;
fc = CPACF_PCKMO_ENC_AES_128_KEY;
break;
case PKEY_KEYTYPE_AES_192:
keysize = 24;
fc = CPACF_PCKMO_ENC_AES_192_KEY;
break;
case PKEY_KEYTYPE_AES_256:
keysize = 32;
fc = CPACF_PCKMO_ENC_AES_256_KEY;
break;
default:
DEBUG_ERR("%s unknown/unsupported keytype %d\n",
__func__, keytype);
return -EINVAL;
}
/*
* Check if the needed pckmo subfunction is available.
* These subfunctions can be enabled/disabled by customers
* in the LPAR profile or may even change on the fly.
*/
if (!cpacf_test_func(&pckmo_functions, fc)) {
DEBUG_ERR("%s pckmo functions not available\n", __func__);
return -EOPNOTSUPP;
}
/* prepare param block */
memset(paramblock, 0, sizeof(paramblock));
memcpy(paramblock, clrkey->clrkey, keysize);
/* call the pckmo instruction */
cpacf_pckmo(fc, paramblock);
/* copy created protected key */
protkey->type = keytype;
protkey->len = keysize + 32;
memcpy(protkey->protkey, paramblock, keysize + 32);
return 0;
}
EXPORT_SYMBOL(pkey_clr2protkey);
/*
* query cryptographic facility from adapter
*/
static int query_crypto_facility(u16 cardnr, u16 domain,
const char *keyword,
u8 *rarray, size_t *rarraylen,
u8 *varray, size_t *varraylen)
{
int rc;
u16 len;
u8 *mem, *ptr;
struct CPRBX *preqcblk, *prepcblk;
struct ica_xcRB xcrb;
struct fqreqparm {
u8 subfunc_code[2];
u16 rule_array_len;
char rule_array[8];
struct lv1 {
u16 len;
u8 data[VARDATASIZE];
} lv1;
u16 dummylen;
} *preqparm;
size_t parmbsize = sizeof(struct fqreqparm);
struct fqrepparm {
u8 subfunc_code[2];
u8 lvdata[0];
} *prepparm;
/* get already prepared memory for 2 cprbs with param block each */
rc = alloc_and_prep_cprbmem(parmbsize, &mem, &preqcblk, &prepcblk);
if (rc)
return rc;
/* fill request cprb struct */
preqcblk->domain = domain;
/* fill request cprb param block with FQ request */
preqparm = (struct fqreqparm *) preqcblk->req_parmb;
memcpy(preqparm->subfunc_code, "FQ", 2);
memcpy(preqparm->rule_array, keyword, sizeof(preqparm->rule_array));
preqparm->rule_array_len =
sizeof(preqparm->rule_array_len) + sizeof(preqparm->rule_array);
preqparm->lv1.len = sizeof(preqparm->lv1);
preqparm->dummylen = sizeof(preqparm->dummylen);
preqcblk->req_parml = parmbsize;
/* fill xcrb struct */
prep_xcrb(&xcrb, cardnr, preqcblk, prepcblk);
/* forward xcrb with request CPRB and reply CPRB to zcrypt dd */
rc = _zcrypt_send_cprb(&xcrb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n",
__func__, (int) cardnr, (int) domain, rc);
goto out;
}
/* check response returncode and reasoncode */
if (prepcblk->ccp_rtcode != 0) {
DEBUG_ERR(
"%s unwrap secure key failure, card response %d/%d\n",
__func__,
(int) prepcblk->ccp_rtcode,
(int) prepcblk->ccp_rscode);
rc = -EIO;
goto out;
}
/* process response cprb param block */
prepcblk->rpl_parmb = ((u8 *) prepcblk) + sizeof(struct CPRBX);
prepparm = (struct fqrepparm *) prepcblk->rpl_parmb;
ptr = prepparm->lvdata;
/* check and possibly copy reply rule array */
len = *((u16 *) ptr);
if (len > sizeof(u16)) {
ptr += sizeof(u16);
len -= sizeof(u16);
if (rarray && rarraylen && *rarraylen > 0) {
*rarraylen = (len > *rarraylen ? *rarraylen : len);
memcpy(rarray, ptr, *rarraylen);
}
ptr += len;
}
/* check and possible copy reply var array */
len = *((u16 *) ptr);
if (len > sizeof(u16)) {
ptr += sizeof(u16);
len -= sizeof(u16);
if (varray && varraylen && *varraylen > 0) {
*varraylen = (len > *varraylen ? *varraylen : len);
memcpy(varray, ptr, *varraylen);
}
ptr += len;
}
out:
free_cprbmem(mem, parmbsize, 0);
return rc;
}
/*
* Fetch the current and old mkvp values via
* query_crypto_facility from adapter.
*/
static int fetch_mkvp(u16 cardnr, u16 domain, u64 mkvp[2])
{
int rc, found = 0;
size_t rlen, vlen;
u8 *rarray, *varray, *pg;
pg = (u8 *) __get_free_page(GFP_KERNEL);
if (!pg)
return -ENOMEM;
rarray = pg;
varray = pg + PAGE_SIZE/2;
rlen = vlen = PAGE_SIZE/2;
rc = query_crypto_facility(cardnr, domain, "STATICSA",
rarray, &rlen, varray, &vlen);
if (rc == 0 && rlen > 8*8 && vlen > 184+8) {
if (rarray[8*8] == '2') {
/* current master key state is valid */
mkvp[0] = *((u64 *)(varray + 184));
mkvp[1] = *((u64 *)(varray + 172));
found = 1;
}
}
free_page((unsigned long) pg);
return found ? 0 : -ENOENT;
}
/* struct to hold cached mkvp info for each card/domain */
struct mkvp_info {
struct list_head list;
u16 cardnr;
u16 domain;
u64 mkvp[2];
};
/* a list with mkvp_info entries */
static LIST_HEAD(mkvp_list);
static DEFINE_SPINLOCK(mkvp_list_lock);
static int mkvp_cache_fetch(u16 cardnr, u16 domain, u64 mkvp[2])
{
int rc = -ENOENT;
struct mkvp_info *ptr;
spin_lock_bh(&mkvp_list_lock);
list_for_each_entry(ptr, &mkvp_list, list) {
if (ptr->cardnr == cardnr &&
ptr->domain == domain) {
memcpy(mkvp, ptr->mkvp, 2 * sizeof(u64));
rc = 0;
break;
}
}
spin_unlock_bh(&mkvp_list_lock);
return rc;
}
static void mkvp_cache_update(u16 cardnr, u16 domain, u64 mkvp[2])
{
int found = 0;
struct mkvp_info *ptr;
spin_lock_bh(&mkvp_list_lock);
list_for_each_entry(ptr, &mkvp_list, list) {
if (ptr->cardnr == cardnr &&
ptr->domain == domain) {
memcpy(ptr->mkvp, mkvp, 2 * sizeof(u64));
found = 1;
break;
}
}
if (!found) {
ptr = kmalloc(sizeof(*ptr), GFP_ATOMIC);
if (!ptr) {
spin_unlock_bh(&mkvp_list_lock);
return;
}
ptr->cardnr = cardnr;
ptr->domain = domain;
memcpy(ptr->mkvp, mkvp, 2 * sizeof(u64));
list_add(&ptr->list, &mkvp_list);
}
spin_unlock_bh(&mkvp_list_lock);
}
static void mkvp_cache_scrub(u16 cardnr, u16 domain)
{
struct mkvp_info *ptr;
spin_lock_bh(&mkvp_list_lock);
list_for_each_entry(ptr, &mkvp_list, list) {
if (ptr->cardnr == cardnr &&
ptr->domain == domain) {
list_del(&ptr->list);
kfree(ptr);
break;
}
}
spin_unlock_bh(&mkvp_list_lock);
}
static void __exit mkvp_cache_free(void)
{
struct mkvp_info *ptr, *pnext;
spin_lock_bh(&mkvp_list_lock);
list_for_each_entry_safe(ptr, pnext, &mkvp_list, list) {
list_del(&ptr->list);
kfree(ptr);
}
spin_unlock_bh(&mkvp_list_lock);
}
/*
* Search for a matching crypto card based on the Master Key
* Verification Pattern provided inside a secure key.
*/
int pkey_findcard(const struct pkey_seckey *seckey,
u16 *pcardnr, u16 *pdomain, int verify)
{
struct secaeskeytoken *t = (struct secaeskeytoken *) seckey;
struct zcrypt_device_status_ext *device_status;
u16 card, dom;
u64 mkvp[2];
int i, rc, oi = -1;
/* mkvp must not be zero */
if (t->mkvp == 0)
return -EINVAL;
/* fetch status of all crypto cards */
device_status = kmalloc_array(MAX_ZDEV_ENTRIES_EXT,
sizeof(struct zcrypt_device_status_ext),
GFP_KERNEL);
if (!device_status)
return -ENOMEM;
zcrypt_device_status_mask_ext(device_status);
/* walk through all crypto cards */
for (i = 0; i < MAX_ZDEV_ENTRIES_EXT; i++) {
card = AP_QID_CARD(device_status[i].qid);
dom = AP_QID_QUEUE(device_status[i].qid);
if (device_status[i].online &&
device_status[i].functions & 0x04) {
/* an enabled CCA Coprocessor card */
/* try cached mkvp */
if (mkvp_cache_fetch(card, dom, mkvp) == 0 &&
t->mkvp == mkvp[0]) {
if (!verify)
break;
/* verify: fetch mkvp from adapter */
if (fetch_mkvp(card, dom, mkvp) == 0) {
mkvp_cache_update(card, dom, mkvp);
if (t->mkvp == mkvp[0])
break;
}
}
} else {
/* Card is offline and/or not a CCA card. */
/* del mkvp entry from cache if it exists */
mkvp_cache_scrub(card, dom);
}
}
if (i >= MAX_ZDEV_ENTRIES_EXT) {
/* nothing found, so this time without cache */
for (i = 0; i < MAX_ZDEV_ENTRIES_EXT; i++) {
if (!(device_status[i].online &&
device_status[i].functions & 0x04))
continue;
card = AP_QID_CARD(device_status[i].qid);
dom = AP_QID_QUEUE(device_status[i].qid);
/* fresh fetch mkvp from adapter */
if (fetch_mkvp(card, dom, mkvp) == 0) {
mkvp_cache_update(card, dom, mkvp);
if (t->mkvp == mkvp[0])
break;
if (t->mkvp == mkvp[1] && oi < 0)
oi = i;
}
}
if (i >= MAX_ZDEV_ENTRIES_EXT && oi >= 0) {
/* old mkvp matched, use this card then */
card = AP_QID_CARD(device_status[oi].qid);
dom = AP_QID_QUEUE(device_status[oi].qid);
}
}
if (i < MAX_ZDEV_ENTRIES_EXT || oi >= 0) {
if (pcardnr)
*pcardnr = card;
if (pdomain)
*pdomain = dom;
rc = 0;
} else
rc = -ENODEV;
kfree(device_status);
return rc;
}
EXPORT_SYMBOL(pkey_findcard);
/*
* Find card and transform secure key into protected key.
*/
int pkey_skey2pkey(const struct pkey_seckey *seckey,
struct pkey_protkey *protkey)
{
u16 cardnr, domain;
int rc, verify;
/*
* The pkey_sec2protkey call may fail when a card has been
* addressed where the master key was changed after last fetch
* of the mkvp into the cache. So first try without verify then
* with verify enabled (thus refreshing the mkvp for each card).
*/
for (verify = 0; verify < 2; verify++) {
rc = pkey_findcard(seckey, &cardnr, &domain, verify);
if (rc)
continue;
rc = pkey_sec2protkey(cardnr, domain, seckey, protkey);
if (rc == 0)
break;
}
if (rc)
DEBUG_DBG("%s failed rc=%d\n", __func__, rc);
return rc;
}
EXPORT_SYMBOL(pkey_skey2pkey);
/*
* Verify key and give back some info about the key.
*/
int pkey_verifykey(const struct pkey_seckey *seckey,
u16 *pcardnr, u16 *pdomain,
u16 *pkeysize, u32 *pattributes)
{
struct secaeskeytoken *t = (struct secaeskeytoken *) seckey;
u16 cardnr, domain;
u64 mkvp[2];
int rc;
/* check the secure key for valid AES secure key */
rc = check_secaeskeytoken((u8 *) seckey, 0);
if (rc)
goto out;
if (pattributes)
*pattributes = PKEY_VERIFY_ATTR_AES;
if (pkeysize)
*pkeysize = t->bitsize;
/* try to find a card which can handle this key */
rc = pkey_findcard(seckey, &cardnr, &domain, 1);
if (rc)
goto out;
/* check mkvp for old mkvp match */
rc = mkvp_cache_fetch(cardnr, domain, mkvp);
if (rc)
goto out;
if (t->mkvp == mkvp[1] && t->mkvp != mkvp[0]) {
DEBUG_DBG("%s secure key has old mkvp\n", __func__);
if (pattributes)
*pattributes |= PKEY_VERIFY_ATTR_OLD_MKVP;
}
if (pcardnr)
*pcardnr = cardnr;
if (pdomain)
*pdomain = domain;
out:
DEBUG_DBG("%s rc=%d\n", __func__, rc);
return rc;
}
EXPORT_SYMBOL(pkey_verifykey);
/*
* Generate a random protected key
*/
int pkey_genprotkey(__u32 keytype, struct pkey_protkey *protkey)
{
struct pkey_clrkey clrkey;
int keysize;
int rc;
switch (keytype) {
case PKEY_KEYTYPE_AES_128:
keysize = 16;
break;
case PKEY_KEYTYPE_AES_192:
keysize = 24;
break;
case PKEY_KEYTYPE_AES_256:
keysize = 32;
break;
default:
DEBUG_ERR("%s unknown/unsupported keytype %d\n", __func__,
keytype);
return -EINVAL;
}
/* generate a dummy random clear key */
get_random_bytes(clrkey.clrkey, keysize);
/* convert it to a dummy protected key */
rc = pkey_clr2protkey(keytype, &clrkey, protkey);
if (rc)
return rc;
/* replace the key part of the protected key with random bytes */
get_random_bytes(protkey->protkey, keysize);
return 0;
}
EXPORT_SYMBOL(pkey_genprotkey);
/*
* Verify if a protected key is still valid
*/
int pkey_verifyprotkey(const struct pkey_protkey *protkey)
{
unsigned long fc;
struct {
u8 iv[AES_BLOCK_SIZE];
u8 key[MAXPROTKEYSIZE];
} param;
u8 null_msg[AES_BLOCK_SIZE];
u8 dest_buf[AES_BLOCK_SIZE];
unsigned int k;
switch (protkey->type) {
case PKEY_KEYTYPE_AES_128:
fc = CPACF_KMC_PAES_128;
break;
case PKEY_KEYTYPE_AES_192:
fc = CPACF_KMC_PAES_192;
break;
case PKEY_KEYTYPE_AES_256:
fc = CPACF_KMC_PAES_256;
break;
default:
DEBUG_ERR("%s unknown/unsupported keytype %d\n", __func__,
protkey->type);
return -EINVAL;
}
memset(null_msg, 0, sizeof(null_msg));
memset(param.iv, 0, sizeof(param.iv));
memcpy(param.key, protkey->protkey, sizeof(param.key));
k = cpacf_kmc(fc | CPACF_ENCRYPT, &param, null_msg, dest_buf,
sizeof(null_msg));
if (k != sizeof(null_msg)) {
DEBUG_ERR("%s protected key is not valid\n", __func__);
return -EKEYREJECTED;
}
return 0;
}
EXPORT_SYMBOL(pkey_verifyprotkey);
/*
* Transform a non-CCA key token into a protected key
*/
static int pkey_nonccatok2pkey(const __u8 *key, __u32 keylen,
struct pkey_protkey *protkey)
{
struct keytoken_header *hdr = (struct keytoken_header *)key;
struct protaeskeytoken *t;
switch (hdr->version) {
case TOKVER_PROTECTED_KEY:
if (keylen != sizeof(struct protaeskeytoken))
return -EINVAL;
t = (struct protaeskeytoken *)key;
protkey->len = t->len;
protkey->type = t->keytype;
memcpy(protkey->protkey, t->protkey,
sizeof(protkey->protkey));
return pkey_verifyprotkey(protkey);
default:
DEBUG_ERR("%s unknown/unsupported non-CCA token version %d\n",
__func__, hdr->version);
return -EINVAL;
}
}
/*
* Transform a CCA internal key token into a protected key
*/
static int pkey_ccainttok2pkey(const __u8 *key, __u32 keylen,
struct pkey_protkey *protkey)
{
struct keytoken_header *hdr = (struct keytoken_header *)key;
switch (hdr->version) {
case TOKVER_CCA_AES:
if (keylen != sizeof(struct secaeskeytoken))
return -EINVAL;
return pkey_skey2pkey((struct pkey_seckey *)key,
protkey);
default:
DEBUG_ERR("%s unknown/unsupported CCA internal token version %d\n",
__func__, hdr->version);
return -EINVAL;
}
}
/*
* Transform a key blob (of any type) into a protected key
*/
int pkey_keyblob2pkey(const __u8 *key, __u32 keylen,
struct pkey_protkey *protkey)
{
struct keytoken_header *hdr = (struct keytoken_header *)key;
if (keylen < sizeof(struct keytoken_header))
return -EINVAL;
switch (hdr->type) {
case TOKTYPE_NON_CCA:
return pkey_nonccatok2pkey(key, keylen, protkey);
case TOKTYPE_CCA_INTERNAL:
return pkey_ccainttok2pkey(key, keylen, protkey);
default:
DEBUG_ERR("%s unknown/unsupported blob type %d\n", __func__,
hdr->type);
return -EINVAL;
}
}
EXPORT_SYMBOL(pkey_keyblob2pkey);
/*
* File io functions
*/
static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
int rc;
switch (cmd) {
case PKEY_GENSECK: {
struct pkey_genseck __user *ugs = (void __user *) arg;
struct pkey_genseck kgs;
if (copy_from_user(&kgs, ugs, sizeof(kgs)))
return -EFAULT;
rc = pkey_genseckey(kgs.cardnr, kgs.domain,
kgs.keytype, &kgs.seckey);
DEBUG_DBG("%s pkey_genseckey()=%d\n", __func__, rc);
if (rc)
break;
if (copy_to_user(ugs, &kgs, sizeof(kgs)))
return -EFAULT;
break;
}
case PKEY_CLR2SECK: {
struct pkey_clr2seck __user *ucs = (void __user *) arg;
struct pkey_clr2seck kcs;
if (copy_from_user(&kcs, ucs, sizeof(kcs)))
return -EFAULT;
rc = pkey_clr2seckey(kcs.cardnr, kcs.domain, kcs.keytype,
&kcs.clrkey, &kcs.seckey);
DEBUG_DBG("%s pkey_clr2seckey()=%d\n", __func__, rc);
if (rc)
break;
if (copy_to_user(ucs, &kcs, sizeof(kcs)))
return -EFAULT;
memzero_explicit(&kcs, sizeof(kcs));
break;
}
case PKEY_SEC2PROTK: {
struct pkey_sec2protk __user *usp = (void __user *) arg;
struct pkey_sec2protk ksp;
if (copy_from_user(&ksp, usp, sizeof(ksp)))
return -EFAULT;
rc = pkey_sec2protkey(ksp.cardnr, ksp.domain,
&ksp.seckey, &ksp.protkey);
DEBUG_DBG("%s pkey_sec2protkey()=%d\n", __func__, rc);
if (rc)
break;
if (copy_to_user(usp, &ksp, sizeof(ksp)))
return -EFAULT;
break;
}
case PKEY_CLR2PROTK: {
struct pkey_clr2protk __user *ucp = (void __user *) arg;
struct pkey_clr2protk kcp;
if (copy_from_user(&kcp, ucp, sizeof(kcp)))
return -EFAULT;
rc = pkey_clr2protkey(kcp.keytype,
&kcp.clrkey, &kcp.protkey);
DEBUG_DBG("%s pkey_clr2protkey()=%d\n", __func__, rc);
if (rc)
break;
if (copy_to_user(ucp, &kcp, sizeof(kcp)))
return -EFAULT;
memzero_explicit(&kcp, sizeof(kcp));
break;
}
case PKEY_FINDCARD: {
struct pkey_findcard __user *ufc = (void __user *) arg;
struct pkey_findcard kfc;
if (copy_from_user(&kfc, ufc, sizeof(kfc)))
return -EFAULT;
rc = pkey_findcard(&kfc.seckey,
&kfc.cardnr, &kfc.domain, 1);
DEBUG_DBG("%s pkey_findcard()=%d\n", __func__, rc);
if (rc)
break;
if (copy_to_user(ufc, &kfc, sizeof(kfc)))
return -EFAULT;
break;
}
case PKEY_SKEY2PKEY: {
struct pkey_skey2pkey __user *usp = (void __user *) arg;
struct pkey_skey2pkey ksp;
if (copy_from_user(&ksp, usp, sizeof(ksp)))
return -EFAULT;
rc = pkey_skey2pkey(&ksp.seckey, &ksp.protkey);
DEBUG_DBG("%s pkey_skey2pkey()=%d\n", __func__, rc);
if (rc)
break;
if (copy_to_user(usp, &ksp, sizeof(ksp)))
return -EFAULT;
break;
}
case PKEY_VERIFYKEY: {
struct pkey_verifykey __user *uvk = (void __user *) arg;
struct pkey_verifykey kvk;
if (copy_from_user(&kvk, uvk, sizeof(kvk)))
return -EFAULT;
rc = pkey_verifykey(&kvk.seckey, &kvk.cardnr, &kvk.domain,
&kvk.keysize, &kvk.attributes);
DEBUG_DBG("%s pkey_verifykey()=%d\n", __func__, rc);
if (rc)
break;
if (copy_to_user(uvk, &kvk, sizeof(kvk)))
return -EFAULT;
break;
}
case PKEY_GENPROTK: {
struct pkey_genprotk __user *ugp = (void __user *) arg;
struct pkey_genprotk kgp;
if (copy_from_user(&kgp, ugp, sizeof(kgp)))
return -EFAULT;
rc = pkey_genprotkey(kgp.keytype, &kgp.protkey);
DEBUG_DBG("%s pkey_genprotkey()=%d\n", __func__, rc);
if (rc)
break;
if (copy_to_user(ugp, &kgp, sizeof(kgp)))
return -EFAULT;
break;
}
case PKEY_VERIFYPROTK: {
struct pkey_verifyprotk __user *uvp = (void __user *) arg;
struct pkey_verifyprotk kvp;
if (copy_from_user(&kvp, uvp, sizeof(kvp)))
return -EFAULT;
rc = pkey_verifyprotkey(&kvp.protkey);
DEBUG_DBG("%s pkey_verifyprotkey()=%d\n", __func__, rc);
break;
}
case PKEY_KBLOB2PROTK: {
struct pkey_kblob2pkey __user *utp = (void __user *) arg;
struct pkey_kblob2pkey ktp;
__u8 __user *ukey;
__u8 *kkey;
if (copy_from_user(&ktp, utp, sizeof(ktp)))
return -EFAULT;
if (ktp.keylen < MINKEYBLOBSIZE ||
ktp.keylen > MAXKEYBLOBSIZE)
return -EINVAL;
ukey = ktp.key;
kkey = kmalloc(ktp.keylen, GFP_KERNEL);
if (kkey == NULL)
return -ENOMEM;
if (copy_from_user(kkey, ukey, ktp.keylen)) {
kfree(kkey);
return -EFAULT;
}
rc = pkey_keyblob2pkey(kkey, ktp.keylen, &ktp.protkey);
DEBUG_DBG("%s pkey_keyblob2pkey()=%d\n", __func__, rc);
kfree(kkey);
if (rc)
break;
if (copy_to_user(utp, &ktp, sizeof(ktp)))
return -EFAULT;
break;
}
default:
/* unknown/unsupported ioctl cmd */
return -ENOTTY;
}
return rc;
}
/*
* Sysfs and file io operations
*/
/*
* Sysfs attribute read function for all protected key binary attributes.
* The implementation can not deal with partial reads, because a new random
* protected key blob is generated with each read. In case of partial reads
* (i.e. off != 0 or count < key blob size) -EINVAL is returned.
*/
static ssize_t pkey_protkey_aes_attr_read(u32 keytype, bool is_xts, char *buf,
loff_t off, size_t count)
{
struct protaeskeytoken protkeytoken;
struct pkey_protkey protkey;
int rc;
if (off != 0 || count < sizeof(protkeytoken))
return -EINVAL;
if (is_xts)
if (count < 2 * sizeof(protkeytoken))
return -EINVAL;
memset(&protkeytoken, 0, sizeof(protkeytoken));
protkeytoken.type = TOKTYPE_NON_CCA;
protkeytoken.version = TOKVER_PROTECTED_KEY;
protkeytoken.keytype = keytype;
rc = pkey_genprotkey(protkeytoken.keytype, &protkey);
if (rc)
return rc;
protkeytoken.len = protkey.len;
memcpy(&protkeytoken.protkey, &protkey.protkey, protkey.len);
memcpy(buf, &protkeytoken, sizeof(protkeytoken));
if (is_xts) {
rc = pkey_genprotkey(protkeytoken.keytype, &protkey);
if (rc)
return rc;
protkeytoken.len = protkey.len;
memcpy(&protkeytoken.protkey, &protkey.protkey, protkey.len);
memcpy(buf + sizeof(protkeytoken), &protkeytoken,
sizeof(protkeytoken));
return 2 * sizeof(protkeytoken);
}
return sizeof(protkeytoken);
}
static ssize_t protkey_aes_128_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_128, false, buf,
off, count);
}
static ssize_t protkey_aes_192_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_192, false, buf,
off, count);
}
static ssize_t protkey_aes_256_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_256, false, buf,
off, count);
}
static ssize_t protkey_aes_128_xts_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_128, true, buf,
off, count);
}
static ssize_t protkey_aes_256_xts_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_256, true, buf,
off, count);
}
static BIN_ATTR_RO(protkey_aes_128, sizeof(struct protaeskeytoken));
static BIN_ATTR_RO(protkey_aes_192, sizeof(struct protaeskeytoken));
static BIN_ATTR_RO(protkey_aes_256, sizeof(struct protaeskeytoken));
static BIN_ATTR_RO(protkey_aes_128_xts, 2 * sizeof(struct protaeskeytoken));
static BIN_ATTR_RO(protkey_aes_256_xts, 2 * sizeof(struct protaeskeytoken));
static struct bin_attribute *protkey_attrs[] = {
&bin_attr_protkey_aes_128,
&bin_attr_protkey_aes_192,
&bin_attr_protkey_aes_256,
&bin_attr_protkey_aes_128_xts,
&bin_attr_protkey_aes_256_xts,
NULL
};
static struct attribute_group protkey_attr_group = {
.name = "protkey",
.bin_attrs = protkey_attrs,
};
/*
* Sysfs attribute read function for all secure key ccadata binary attributes.
* The implementation can not deal with partial reads, because a new random
* protected key blob is generated with each read. In case of partial reads
* (i.e. off != 0 or count < key blob size) -EINVAL is returned.
*/
static ssize_t pkey_ccadata_aes_attr_read(u32 keytype, bool is_xts, char *buf,
loff_t off, size_t count)
{
int rc;
if (off != 0 || count < sizeof(struct secaeskeytoken))
return -EINVAL;
if (is_xts)
if (count < 2 * sizeof(struct secaeskeytoken))
return -EINVAL;
rc = pkey_genseckey(-1, -1, keytype, (struct pkey_seckey *)buf);
if (rc)
return rc;
if (is_xts) {
buf += sizeof(struct pkey_seckey);
rc = pkey_genseckey(-1, -1, keytype, (struct pkey_seckey *)buf);
if (rc)
return rc;
return 2 * sizeof(struct secaeskeytoken);
}
return sizeof(struct secaeskeytoken);
}
static ssize_t ccadata_aes_128_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_128, false, buf,
off, count);
}
static ssize_t ccadata_aes_192_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_192, false, buf,
off, count);
}
static ssize_t ccadata_aes_256_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_256, false, buf,
off, count);
}
static ssize_t ccadata_aes_128_xts_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_128, true, buf,
off, count);
}
static ssize_t ccadata_aes_256_xts_read(struct file *filp,
struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off,
size_t count)
{
return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_256, true, buf,
off, count);
}
static BIN_ATTR_RO(ccadata_aes_128, sizeof(struct secaeskeytoken));
static BIN_ATTR_RO(ccadata_aes_192, sizeof(struct secaeskeytoken));
static BIN_ATTR_RO(ccadata_aes_256, sizeof(struct secaeskeytoken));
static BIN_ATTR_RO(ccadata_aes_128_xts, 2 * sizeof(struct secaeskeytoken));
static BIN_ATTR_RO(ccadata_aes_256_xts, 2 * sizeof(struct secaeskeytoken));
static struct bin_attribute *ccadata_attrs[] = {
&bin_attr_ccadata_aes_128,
&bin_attr_ccadata_aes_192,
&bin_attr_ccadata_aes_256,
&bin_attr_ccadata_aes_128_xts,
&bin_attr_ccadata_aes_256_xts,
NULL
};
static struct attribute_group ccadata_attr_group = {
.name = "ccadata",
.bin_attrs = ccadata_attrs,
};
static const struct attribute_group *pkey_attr_groups[] = {
&protkey_attr_group,
&ccadata_attr_group,
NULL,
};
static const struct file_operations pkey_fops = {
.owner = THIS_MODULE,
.open = nonseekable_open,
.llseek = no_llseek,
.unlocked_ioctl = pkey_unlocked_ioctl,
};
static struct miscdevice pkey_dev = {
.name = "pkey",
.minor = MISC_DYNAMIC_MINOR,
.mode = 0666,
.fops = &pkey_fops,
.groups = pkey_attr_groups,
};
/*
* Module init
*/
static int __init pkey_init(void)
{
cpacf_mask_t kmc_functions;
/*
* The pckmo instruction should be available - even if we don't
* actually invoke it. This instruction comes with MSA 3 which
* is also the minimum level for the kmc instructions which
* are able to work with protected keys.
*/
if (!cpacf_query(CPACF_PCKMO, &pckmo_functions))
return -EOPNOTSUPP;
/* check for kmc instructions available */
if (!cpacf_query(CPACF_KMC, &kmc_functions))
return -EOPNOTSUPP;
if (!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256))
return -EOPNOTSUPP;
pkey_debug_init();
return misc_register(&pkey_dev);
}
/*
* Module exit
*/
static void __exit pkey_exit(void)
{
misc_deregister(&pkey_dev);
mkvp_cache_free();
pkey_debug_exit();
}
module_cpu_feature_match(MSA, pkey_init);
module_exit(pkey_exit);