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linux/drivers/s390/crypto/zcrypt_ep11misc.c
Harald Freudenberger 34515df25d s390/zcrypt: use kvmalloc instead of kmalloc for 256k alloc 
Tests showed that it may happen that a 256k kmalloc may fail
due to a temporary shortage on 256k slab entries.

The find functions for cca and ep11 use a 256k array to fetch the
states of all possible crypto cards and their domains in one
piece. With the patch now kvmalloc is used to allocate this
temporary memory as there is no need to have this memory area
physical continuously.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2020-03-27 10:22:47 +01:00

1294 lines
31 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright IBM Corp. 2019
* Author(s): Harald Freudenberger <freude@linux.ibm.com>
*
* Collection of EP11 misc functions used by zcrypt and pkey
*/
#define KMSG_COMPONENT "zcrypt"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <asm/zcrypt.h>
#include <asm/pkey.h>
#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_debug.h"
#include "zcrypt_msgtype6.h"
#include "zcrypt_ep11misc.h"
#include "zcrypt_ccamisc.h"
#define DEBUG_DBG(...) ZCRYPT_DBF(DBF_DEBUG, ##__VA_ARGS__)
#define DEBUG_INFO(...) ZCRYPT_DBF(DBF_INFO, ##__VA_ARGS__)
#define DEBUG_WARN(...) ZCRYPT_DBF(DBF_WARN, ##__VA_ARGS__)
#define DEBUG_ERR(...) ZCRYPT_DBF(DBF_ERR, ##__VA_ARGS__)
/* default iv used here */
static const u8 def_iv[16] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff };
/* ep11 card info cache */
struct card_list_entry {
struct list_head list;
u16 cardnr;
struct ep11_card_info info;
};
static LIST_HEAD(card_list);
static DEFINE_SPINLOCK(card_list_lock);
static int card_cache_fetch(u16 cardnr, struct ep11_card_info *ci)
{
int rc = -ENOENT;
struct card_list_entry *ptr;
spin_lock_bh(&card_list_lock);
list_for_each_entry(ptr, &card_list, list) {
if (ptr->cardnr == cardnr) {
memcpy(ci, &ptr->info, sizeof(*ci));
rc = 0;
break;
}
}
spin_unlock_bh(&card_list_lock);
return rc;
}
static void card_cache_update(u16 cardnr, const struct ep11_card_info *ci)
{
int found = 0;
struct card_list_entry *ptr;
spin_lock_bh(&card_list_lock);
list_for_each_entry(ptr, &card_list, list) {
if (ptr->cardnr == cardnr) {
memcpy(&ptr->info, ci, sizeof(*ci));
found = 1;
break;
}
}
if (!found) {
ptr = kmalloc(sizeof(*ptr), GFP_ATOMIC);
if (!ptr) {
spin_unlock_bh(&card_list_lock);
return;
}
ptr->cardnr = cardnr;
memcpy(&ptr->info, ci, sizeof(*ci));
list_add(&ptr->list, &card_list);
}
spin_unlock_bh(&card_list_lock);
}
static void card_cache_scrub(u16 cardnr)
{
struct card_list_entry *ptr;
spin_lock_bh(&card_list_lock);
list_for_each_entry(ptr, &card_list, list) {
if (ptr->cardnr == cardnr) {
list_del(&ptr->list);
kfree(ptr);
break;
}
}
spin_unlock_bh(&card_list_lock);
}
static void __exit card_cache_free(void)
{
struct card_list_entry *ptr, *pnext;
spin_lock_bh(&card_list_lock);
list_for_each_entry_safe(ptr, pnext, &card_list, list) {
list_del(&ptr->list);
kfree(ptr);
}
spin_unlock_bh(&card_list_lock);
}
/*
* Simple check if the key blob is a valid EP11 secure AES key.
*/
int ep11_check_aeskeyblob(debug_info_t *dbg, int dbflvl,
const u8 *key, int keybitsize,
int checkcpacfexport)
{
struct ep11keyblob *kb = (struct ep11keyblob *) key;
#define DBF(...) debug_sprintf_event(dbg, dbflvl, ##__VA_ARGS__)
if (kb->head.type != TOKTYPE_NON_CCA) {
if (dbg)
DBF("%s key check failed, type 0x%02x != 0x%02x\n",
__func__, (int) kb->head.type, TOKTYPE_NON_CCA);
return -EINVAL;
}
if (kb->head.version != TOKVER_EP11_AES) {
if (dbg)
DBF("%s key check failed, version 0x%02x != 0x%02x\n",
__func__, (int) kb->head.version, TOKVER_EP11_AES);
return -EINVAL;
}
if (kb->version != EP11_STRUCT_MAGIC) {
if (dbg)
DBF("%s key check failed, magic 0x%04x != 0x%04x\n",
__func__, (int) kb->version, EP11_STRUCT_MAGIC);
return -EINVAL;
}
switch (kb->head.keybitlen) {
case 128:
case 192:
case 256:
break;
default:
if (dbg)
DBF("%s key check failed, keybitlen %d invalid\n",
__func__, (int) kb->head.keybitlen);
return -EINVAL;
}
if (keybitsize > 0 && keybitsize != (int) kb->head.keybitlen) {
DBF("%s key check failed, keybitsize %d\n",
__func__, keybitsize);
return -EINVAL;
}
if (checkcpacfexport && !(kb->attr & EP11_BLOB_PKEY_EXTRACTABLE)) {
if (dbg)
DBF("%s key check failed, PKEY_EXTRACTABLE is 0\n",
__func__);
return -EINVAL;
}
#undef DBF
return 0;
}
EXPORT_SYMBOL(ep11_check_aeskeyblob);
/*
* Helper function which calls zcrypt_send_ep11_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_ep11_cprb(struct ep11_urb *urb)
{
int rc;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
rc = zcrypt_send_ep11_cprb(urb);
set_fs(old_fs);
return rc;
}
/*
* Allocate and prepare ep11 cprb plus additional payload.
*/
static inline struct ep11_cprb *alloc_cprb(size_t payload_len)
{
size_t len = sizeof(struct ep11_cprb) + payload_len;
struct ep11_cprb *cprb;
cprb = kmalloc(len, GFP_KERNEL);
if (!cprb)
return NULL;
memset(cprb, 0, len);
cprb->cprb_len = sizeof(struct ep11_cprb);
cprb->cprb_ver_id = 0x04;
memcpy(cprb->func_id, "T4", 2);
cprb->ret_code = 0xFFFFFFFF;
cprb->payload_len = payload_len;
return cprb;
}
/*
* Some helper functions related to ASN1 encoding.
* Limited to length info <= 2 byte.
*/
#define ASN1TAGLEN(x) (2 + (x) + ((x) > 127 ? 1 : 0) + ((x) > 255 ? 1 : 0))
static int asn1tag_write(u8 *ptr, u8 tag, const u8 *pvalue, u16 valuelen)
{
ptr[0] = tag;
if (valuelen > 255) {
ptr[1] = 0x82;
*((u16 *)(ptr + 2)) = valuelen;
memcpy(ptr + 4, pvalue, valuelen);
return 4 + valuelen;
}
if (valuelen > 127) {
ptr[1] = 0x81;
ptr[2] = (u8) valuelen;
memcpy(ptr + 3, pvalue, valuelen);
return 3 + valuelen;
}
ptr[1] = (u8) valuelen;
memcpy(ptr + 2, pvalue, valuelen);
return 2 + valuelen;
}
/* EP11 payload > 127 bytes starts with this struct */
struct pl_head {
u8 tag;
u8 lenfmt;
u16 len;
u8 func_tag;
u8 func_len;
u32 func;
u8 dom_tag;
u8 dom_len;
u32 dom;
} __packed;
/* prep ep11 payload head helper function */
static inline void prep_head(struct pl_head *h,
size_t pl_size, int api, int func)
{
h->tag = 0x30;
h->lenfmt = 0x82;
h->len = pl_size - 4;
h->func_tag = 0x04;
h->func_len = sizeof(u32);
h->func = (api << 16) + func;
h->dom_tag = 0x04;
h->dom_len = sizeof(u32);
}
/* prep urb helper function */
static inline void prep_urb(struct ep11_urb *u,
struct ep11_target_dev *t, int nt,
struct ep11_cprb *req, size_t req_len,
struct ep11_cprb *rep, size_t rep_len)
{
u->targets = (u8 __user *) t;
u->targets_num = nt;
u->req = (u8 __user *) req;
u->req_len = req_len;
u->resp = (u8 __user *) rep;
u->resp_len = rep_len;
}
/* Check ep11 reply payload, return 0 or suggested errno value. */
static int check_reply_pl(const u8 *pl, const char *func)
{
int len;
u32 ret;
/* start tag */
if (*pl++ != 0x30) {
DEBUG_ERR("%s reply start tag mismatch\n", func);
return -EIO;
}
/* payload length format */
if (*pl < 127) {
len = *pl;
pl++;
} else if (*pl == 0x81) {
pl++;
len = *pl;
pl++;
} else if (*pl == 0x82) {
pl++;
len = *((u16 *)pl);
pl += 2;
} else {
DEBUG_ERR("%s reply start tag lenfmt mismatch 0x%02hhx\n",
func, *pl);
return -EIO;
}
/* len should cover at least 3 fields with 32 bit value each */
if (len < 3 * 6) {
DEBUG_ERR("%s reply length %d too small\n", func, len);
return -EIO;
}
/* function tag, length and value */
if (pl[0] != 0x04 || pl[1] != 0x04) {
DEBUG_ERR("%s function tag or length mismatch\n", func);
return -EIO;
}
pl += 6;
/* dom tag, length and value */
if (pl[0] != 0x04 || pl[1] != 0x04) {
DEBUG_ERR("%s dom tag or length mismatch\n", func);
return -EIO;
}
pl += 6;
/* return value tag, length and value */
if (pl[0] != 0x04 || pl[1] != 0x04) {
DEBUG_ERR("%s return value tag or length mismatch\n", func);
return -EIO;
}
pl += 2;
ret = *((u32 *)pl);
if (ret != 0) {
DEBUG_ERR("%s return value 0x%04x != 0\n", func, ret);
return -EIO;
}
return 0;
}
/*
* Helper function which does an ep11 query with given query type.
*/
static int ep11_query_info(u16 cardnr, u16 domain, u32 query_type,
size_t buflen, u8 *buf)
{
struct ep11_info_req_pl {
struct pl_head head;
u8 query_type_tag;
u8 query_type_len;
u32 query_type;
u8 query_subtype_tag;
u8 query_subtype_len;
u32 query_subtype;
} __packed * req_pl;
struct ep11_info_rep_pl {
struct pl_head head;
u8 rc_tag;
u8 rc_len;
u32 rc;
u8 data_tag;
u8 data_lenfmt;
u16 data_len;
} __packed * rep_pl;
struct ep11_cprb *req = NULL, *rep = NULL;
struct ep11_target_dev target;
struct ep11_urb *urb = NULL;
int api = 1, rc = -ENOMEM;
/* request cprb and payload */
req = alloc_cprb(sizeof(struct ep11_info_req_pl));
if (!req)
goto out;
req_pl = (struct ep11_info_req_pl *) (((u8 *) req) + sizeof(*req));
prep_head(&req_pl->head, sizeof(*req_pl), api, 38); /* get xcp info */
req_pl->query_type_tag = 0x04;
req_pl->query_type_len = sizeof(u32);
req_pl->query_type = query_type;
req_pl->query_subtype_tag = 0x04;
req_pl->query_subtype_len = sizeof(u32);
/* reply cprb and payload */
rep = alloc_cprb(sizeof(struct ep11_info_rep_pl) + buflen);
if (!rep)
goto out;
rep_pl = (struct ep11_info_rep_pl *) (((u8 *) rep) + sizeof(*rep));
/* urb and target */
urb = kmalloc(sizeof(struct ep11_urb), GFP_KERNEL);
if (!urb)
goto out;
target.ap_id = cardnr;
target.dom_id = domain;
prep_urb(urb, &target, 1,
req, sizeof(*req) + sizeof(*req_pl),
rep, sizeof(*rep) + sizeof(*rep_pl) + buflen);
rc = _zcrypt_send_ep11_cprb(urb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_ep11_cprb(card=%d dom=%d) failed, rc=%d\n",
__func__, (int) cardnr, (int) domain, rc);
goto out;
}
rc = check_reply_pl((u8 *)rep_pl, __func__);
if (rc)
goto out;
if (rep_pl->data_tag != 0x04 || rep_pl->data_lenfmt != 0x82) {
DEBUG_ERR("%s unknown reply data format\n", __func__);
rc = -EIO;
goto out;
}
if (rep_pl->data_len > buflen) {
DEBUG_ERR("%s mismatch between reply data len and buffer len\n",
__func__);
rc = -ENOSPC;
goto out;
}
memcpy(buf, ((u8 *) rep_pl) + sizeof(*rep_pl), rep_pl->data_len);
out:
kfree(req);
kfree(rep);
kfree(urb);
return rc;
}
/*
* Provide information about an EP11 card.
*/
int ep11_get_card_info(u16 card, struct ep11_card_info *info, int verify)
{
int rc;
struct ep11_module_query_info {
u32 API_ord_nr;
u32 firmware_id;
u8 FW_major_vers;
u8 FW_minor_vers;
u8 CSP_major_vers;
u8 CSP_minor_vers;
u8 fwid[32];
u8 xcp_config_hash[32];
u8 CSP_config_hash[32];
u8 serial[16];
u8 module_date_time[16];
u64 op_mode;
u32 PKCS11_flags;
u32 ext_flags;
u32 domains;
u32 sym_state_bytes;
u32 digest_state_bytes;
u32 pin_blob_bytes;
u32 SPKI_bytes;
u32 priv_key_blob_bytes;
u32 sym_blob_bytes;
u32 max_payload_bytes;
u32 CP_profile_bytes;
u32 max_CP_index;
} __packed * pmqi = NULL;
rc = card_cache_fetch(card, info);
if (rc || verify) {
pmqi = kmalloc(sizeof(*pmqi), GFP_KERNEL);
if (!pmqi)
return -ENOMEM;
rc = ep11_query_info(card, AUTOSEL_DOM,
0x01 /* module info query */,
sizeof(*pmqi), (u8 *) pmqi);
if (rc) {
if (rc == -ENODEV)
card_cache_scrub(card);
goto out;
}
memset(info, 0, sizeof(*info));
info->API_ord_nr = pmqi->API_ord_nr;
info->FW_version =
(pmqi->FW_major_vers << 8) + pmqi->FW_minor_vers;
memcpy(info->serial, pmqi->serial, sizeof(info->serial));
info->op_mode = pmqi->op_mode;
card_cache_update(card, info);
}
out:
kfree(pmqi);
return rc;
}
EXPORT_SYMBOL(ep11_get_card_info);
/*
* Provide information about a domain within an EP11 card.
*/
int ep11_get_domain_info(u16 card, u16 domain, struct ep11_domain_info *info)
{
int rc;
struct ep11_domain_query_info {
u32 dom_index;
u8 cur_WK_VP[32];
u8 new_WK_VP[32];
u32 dom_flags;
u64 op_mode;
} __packed * p_dom_info;
p_dom_info = kmalloc(sizeof(*p_dom_info), GFP_KERNEL);
if (!p_dom_info)
return -ENOMEM;
rc = ep11_query_info(card, domain, 0x03 /* domain info query */,
sizeof(*p_dom_info), (u8 *) p_dom_info);
if (rc)
goto out;
memset(info, 0, sizeof(*info));
info->cur_wk_state = '0';
info->new_wk_state = '0';
if (p_dom_info->dom_flags & 0x10 /* left imprint mode */) {
if (p_dom_info->dom_flags & 0x02 /* cur wk valid */) {
info->cur_wk_state = '1';
memcpy(info->cur_wkvp, p_dom_info->cur_WK_VP, 32);
}
if (p_dom_info->dom_flags & 0x04 /* new wk present */
|| p_dom_info->dom_flags & 0x08 /* new wk committed */) {
info->new_wk_state =
p_dom_info->dom_flags & 0x08 ? '2' : '1';
memcpy(info->new_wkvp, p_dom_info->new_WK_VP, 32);
}
}
info->op_mode = p_dom_info->op_mode;
out:
kfree(p_dom_info);
return rc;
}
EXPORT_SYMBOL(ep11_get_domain_info);
/*
* Default EP11 AES key generate attributes, used when no keygenflags given:
* XCP_BLOB_ENCRYPT | XCP_BLOB_DECRYPT | XCP_BLOB_PROTKEY_EXTRACTABLE
*/
#define KEY_ATTR_DEFAULTS 0x00200c00
int ep11_genaeskey(u16 card, u16 domain, u32 keybitsize, u32 keygenflags,
u8 *keybuf, size_t *keybufsize)
{
struct keygen_req_pl {
struct pl_head head;
u8 var_tag;
u8 var_len;
u32 var;
u8 keybytes_tag;
u8 keybytes_len;
u32 keybytes;
u8 mech_tag;
u8 mech_len;
u32 mech;
u8 attr_tag;
u8 attr_len;
u32 attr_header;
u32 attr_bool_mask;
u32 attr_bool_bits;
u32 attr_val_len_type;
u32 attr_val_len_value;
u8 pin_tag;
u8 pin_len;
} __packed * req_pl;
struct keygen_rep_pl {
struct pl_head head;
u8 rc_tag;
u8 rc_len;
u32 rc;
u8 data_tag;
u8 data_lenfmt;
u16 data_len;
u8 data[512];
} __packed * rep_pl;
struct ep11_cprb *req = NULL, *rep = NULL;
struct ep11_target_dev target;
struct ep11_urb *urb = NULL;
struct ep11keyblob *kb;
int api, rc = -ENOMEM;
switch (keybitsize) {
case 128:
case 192:
case 256:
break;
default:
DEBUG_ERR(
"%s unknown/unsupported keybitsize %d\n",
__func__, keybitsize);
rc = -EINVAL;
goto out;
}
/* request cprb and payload */
req = alloc_cprb(sizeof(struct keygen_req_pl));
if (!req)
goto out;
req_pl = (struct keygen_req_pl *) (((u8 *) req) + sizeof(*req));
api = (!keygenflags || keygenflags & 0x00200000) ? 4 : 1;
prep_head(&req_pl->head, sizeof(*req_pl), api, 21); /* GenerateKey */
req_pl->var_tag = 0x04;
req_pl->var_len = sizeof(u32);
req_pl->keybytes_tag = 0x04;
req_pl->keybytes_len = sizeof(u32);
req_pl->keybytes = keybitsize / 8;
req_pl->mech_tag = 0x04;
req_pl->mech_len = sizeof(u32);
req_pl->mech = 0x00001080; /* CKM_AES_KEY_GEN */
req_pl->attr_tag = 0x04;
req_pl->attr_len = 5 * sizeof(u32);
req_pl->attr_header = 0x10010000;
req_pl->attr_bool_mask = keygenflags ? keygenflags : KEY_ATTR_DEFAULTS;
req_pl->attr_bool_bits = keygenflags ? keygenflags : KEY_ATTR_DEFAULTS;
req_pl->attr_val_len_type = 0x00000161; /* CKA_VALUE_LEN */
req_pl->attr_val_len_value = keybitsize / 8;
req_pl->pin_tag = 0x04;
/* reply cprb and payload */
rep = alloc_cprb(sizeof(struct keygen_rep_pl));
if (!rep)
goto out;
rep_pl = (struct keygen_rep_pl *) (((u8 *) rep) + sizeof(*rep));
/* urb and target */
urb = kmalloc(sizeof(struct ep11_urb), GFP_KERNEL);
if (!urb)
goto out;
target.ap_id = card;
target.dom_id = domain;
prep_urb(urb, &target, 1,
req, sizeof(*req) + sizeof(*req_pl),
rep, sizeof(*rep) + sizeof(*rep_pl));
rc = _zcrypt_send_ep11_cprb(urb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_ep11_cprb(card=%d dom=%d) failed, rc=%d\n",
__func__, (int) card, (int) domain, rc);
goto out;
}
rc = check_reply_pl((u8 *)rep_pl, __func__);
if (rc)
goto out;
if (rep_pl->data_tag != 0x04 || rep_pl->data_lenfmt != 0x82) {
DEBUG_ERR("%s unknown reply data format\n", __func__);
rc = -EIO;
goto out;
}
if (rep_pl->data_len > *keybufsize) {
DEBUG_ERR("%s mismatch reply data len / key buffer len\n",
__func__);
rc = -ENOSPC;
goto out;
}
/* copy key blob and set header values */
memcpy(keybuf, rep_pl->data, rep_pl->data_len);
*keybufsize = rep_pl->data_len;
kb = (struct ep11keyblob *) keybuf;
kb->head.type = TOKTYPE_NON_CCA;
kb->head.len = rep_pl->data_len;
kb->head.version = TOKVER_EP11_AES;
kb->head.keybitlen = keybitsize;
out:
kfree(req);
kfree(rep);
kfree(urb);
return rc;
}
EXPORT_SYMBOL(ep11_genaeskey);
static int ep11_cryptsingle(u16 card, u16 domain,
u16 mode, u32 mech, const u8 *iv,
const u8 *key, size_t keysize,
const u8 *inbuf, size_t inbufsize,
u8 *outbuf, size_t *outbufsize)
{
struct crypt_req_pl {
struct pl_head head;
u8 var_tag;
u8 var_len;
u32 var;
u8 mech_tag;
u8 mech_len;
u32 mech;
/*
* maybe followed by iv data
* followed by key tag + key blob
* followed by plaintext tag + plaintext
*/
} __packed * req_pl;
struct crypt_rep_pl {
struct pl_head head;
u8 rc_tag;
u8 rc_len;
u32 rc;
u8 data_tag;
u8 data_lenfmt;
/* data follows */
} __packed * rep_pl;
struct ep11_cprb *req = NULL, *rep = NULL;
struct ep11_target_dev target;
struct ep11_urb *urb = NULL;
size_t req_pl_size, rep_pl_size;
int n, api = 1, rc = -ENOMEM;
u8 *p;
/* the simple asn1 coding used has length limits */
if (keysize > 0xFFFF || inbufsize > 0xFFFF)
return -EINVAL;
/* request cprb and payload */
req_pl_size = sizeof(struct crypt_req_pl) + (iv ? 16 : 0)
+ ASN1TAGLEN(keysize) + ASN1TAGLEN(inbufsize);
req = alloc_cprb(req_pl_size);
if (!req)
goto out;
req_pl = (struct crypt_req_pl *) (((u8 *) req) + sizeof(*req));
prep_head(&req_pl->head, req_pl_size, api, (mode ? 20 : 19));
req_pl->var_tag = 0x04;
req_pl->var_len = sizeof(u32);
/* mech is mech + mech params (iv here) */
req_pl->mech_tag = 0x04;
req_pl->mech_len = sizeof(u32) + (iv ? 16 : 0);
req_pl->mech = (mech ? mech : 0x00001085); /* CKM_AES_CBC_PAD */
p = ((u8 *) req_pl) + sizeof(*req_pl);
if (iv) {
memcpy(p, iv, 16);
p += 16;
}
/* key and input data */
p += asn1tag_write(p, 0x04, key, keysize);
p += asn1tag_write(p, 0x04, inbuf, inbufsize);
/* reply cprb and payload, assume out data size <= in data size + 32 */
rep_pl_size = sizeof(struct crypt_rep_pl) + ASN1TAGLEN(inbufsize + 32);
rep = alloc_cprb(rep_pl_size);
if (!rep)
goto out;
rep_pl = (struct crypt_rep_pl *) (((u8 *) rep) + sizeof(*rep));
/* urb and target */
urb = kmalloc(sizeof(struct ep11_urb), GFP_KERNEL);
if (!urb)
goto out;
target.ap_id = card;
target.dom_id = domain;
prep_urb(urb, &target, 1,
req, sizeof(*req) + req_pl_size,
rep, sizeof(*rep) + rep_pl_size);
rc = _zcrypt_send_ep11_cprb(urb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_ep11_cprb(card=%d dom=%d) failed, rc=%d\n",
__func__, (int) card, (int) domain, rc);
goto out;
}
rc = check_reply_pl((u8 *)rep_pl, __func__);
if (rc)
goto out;
if (rep_pl->data_tag != 0x04) {
DEBUG_ERR("%s unknown reply data format\n", __func__);
rc = -EIO;
goto out;
}
p = ((u8 *) rep_pl) + sizeof(*rep_pl);
if (rep_pl->data_lenfmt <= 127)
n = rep_pl->data_lenfmt;
else if (rep_pl->data_lenfmt == 0x81)
n = *p++;
else if (rep_pl->data_lenfmt == 0x82) {
n = *((u16 *) p);
p += 2;
} else {
DEBUG_ERR("%s unknown reply data length format 0x%02hhx\n",
__func__, rep_pl->data_lenfmt);
rc = -EIO;
goto out;
}
if (n > *outbufsize) {
DEBUG_ERR("%s mismatch reply data len %d / output buffer %zu\n",
__func__, n, *outbufsize);
rc = -ENOSPC;
goto out;
}
memcpy(outbuf, p, n);
*outbufsize = n;
out:
kfree(req);
kfree(rep);
kfree(urb);
return rc;
}
static int ep11_unwrapkey(u16 card, u16 domain,
const u8 *kek, size_t keksize,
const u8 *enckey, size_t enckeysize,
u32 mech, const u8 *iv,
u32 keybitsize, u32 keygenflags,
u8 *keybuf, size_t *keybufsize)
{
struct uw_req_pl {
struct pl_head head;
u8 attr_tag;
u8 attr_len;
u32 attr_header;
u32 attr_bool_mask;
u32 attr_bool_bits;
u32 attr_key_type;
u32 attr_key_type_value;
u32 attr_val_len;
u32 attr_val_len_value;
u8 mech_tag;
u8 mech_len;
u32 mech;
/*
* maybe followed by iv data
* followed by kek tag + kek blob
* followed by empty mac tag
* followed by empty pin tag
* followed by encryted key tag + bytes
*/
} __packed * req_pl;
struct uw_rep_pl {
struct pl_head head;
u8 rc_tag;
u8 rc_len;
u32 rc;
u8 data_tag;
u8 data_lenfmt;
u16 data_len;
u8 data[512];
} __packed * rep_pl;
struct ep11_cprb *req = NULL, *rep = NULL;
struct ep11_target_dev target;
struct ep11_urb *urb = NULL;
struct ep11keyblob *kb;
size_t req_pl_size;
int api, rc = -ENOMEM;
u8 *p;
/* request cprb and payload */
req_pl_size = sizeof(struct uw_req_pl) + (iv ? 16 : 0)
+ ASN1TAGLEN(keksize) + 4 + ASN1TAGLEN(enckeysize);
req = alloc_cprb(req_pl_size);
if (!req)
goto out;
req_pl = (struct uw_req_pl *) (((u8 *) req) + sizeof(*req));
api = (!keygenflags || keygenflags & 0x00200000) ? 4 : 1;
prep_head(&req_pl->head, req_pl_size, api, 34); /* UnwrapKey */
req_pl->attr_tag = 0x04;
req_pl->attr_len = 7 * sizeof(u32);
req_pl->attr_header = 0x10020000;
req_pl->attr_bool_mask = keygenflags ? keygenflags : KEY_ATTR_DEFAULTS;
req_pl->attr_bool_bits = keygenflags ? keygenflags : KEY_ATTR_DEFAULTS;
req_pl->attr_key_type = 0x00000100; /* CKA_KEY_TYPE */
req_pl->attr_key_type_value = 0x0000001f; /* CKK_AES */
req_pl->attr_val_len = 0x00000161; /* CKA_VALUE_LEN */
req_pl->attr_val_len_value = keybitsize / 8;
/* mech is mech + mech params (iv here) */
req_pl->mech_tag = 0x04;
req_pl->mech_len = sizeof(u32) + (iv ? 16 : 0);
req_pl->mech = (mech ? mech : 0x00001085); /* CKM_AES_CBC_PAD */
p = ((u8 *) req_pl) + sizeof(*req_pl);
if (iv) {
memcpy(p, iv, 16);
p += 16;
}
/* kek */
p += asn1tag_write(p, 0x04, kek, keksize);
/* empty mac key tag */
*p++ = 0x04;
*p++ = 0;
/* empty pin tag */
*p++ = 0x04;
*p++ = 0;
/* encrytped key value tag and bytes */
p += asn1tag_write(p, 0x04, enckey, enckeysize);
/* reply cprb and payload */
rep = alloc_cprb(sizeof(struct uw_rep_pl));
if (!rep)
goto out;
rep_pl = (struct uw_rep_pl *) (((u8 *) rep) + sizeof(*rep));
/* urb and target */
urb = kmalloc(sizeof(struct ep11_urb), GFP_KERNEL);
if (!urb)
goto out;
target.ap_id = card;
target.dom_id = domain;
prep_urb(urb, &target, 1,
req, sizeof(*req) + req_pl_size,
rep, sizeof(*rep) + sizeof(*rep_pl));
rc = _zcrypt_send_ep11_cprb(urb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_ep11_cprb(card=%d dom=%d) failed, rc=%d\n",
__func__, (int) card, (int) domain, rc);
goto out;
}
rc = check_reply_pl((u8 *)rep_pl, __func__);
if (rc)
goto out;
if (rep_pl->data_tag != 0x04 || rep_pl->data_lenfmt != 0x82) {
DEBUG_ERR("%s unknown reply data format\n", __func__);
rc = -EIO;
goto out;
}
if (rep_pl->data_len > *keybufsize) {
DEBUG_ERR("%s mismatch reply data len / key buffer len\n",
__func__);
rc = -ENOSPC;
goto out;
}
/* copy key blob and set header values */
memcpy(keybuf, rep_pl->data, rep_pl->data_len);
*keybufsize = rep_pl->data_len;
kb = (struct ep11keyblob *) keybuf;
kb->head.type = TOKTYPE_NON_CCA;
kb->head.len = rep_pl->data_len;
kb->head.version = TOKVER_EP11_AES;
kb->head.keybitlen = keybitsize;
out:
kfree(req);
kfree(rep);
kfree(urb);
return rc;
}
static int ep11_wrapkey(u16 card, u16 domain,
const u8 *key, size_t keysize,
u32 mech, const u8 *iv,
u8 *databuf, size_t *datasize)
{
struct wk_req_pl {
struct pl_head head;
u8 var_tag;
u8 var_len;
u32 var;
u8 mech_tag;
u8 mech_len;
u32 mech;
/*
* followed by iv data
* followed by key tag + key blob
* followed by dummy kek param
* followed by dummy mac param
*/
} __packed * req_pl;
struct wk_rep_pl {
struct pl_head head;
u8 rc_tag;
u8 rc_len;
u32 rc;
u8 data_tag;
u8 data_lenfmt;
u16 data_len;
u8 data[512];
} __packed * rep_pl;
struct ep11_cprb *req = NULL, *rep = NULL;
struct ep11_target_dev target;
struct ep11_urb *urb = NULL;
struct ep11keyblob *kb;
size_t req_pl_size;
int api, rc = -ENOMEM;
u8 *p;
/* request cprb and payload */
req_pl_size = sizeof(struct wk_req_pl) + (iv ? 16 : 0)
+ ASN1TAGLEN(keysize) + 4;
req = alloc_cprb(req_pl_size);
if (!req)
goto out;
if (!mech || mech == 0x80060001)
req->flags |= 0x20; /* CPACF_WRAP needs special bit */
req_pl = (struct wk_req_pl *) (((u8 *) req) + sizeof(*req));
api = (!mech || mech == 0x80060001) ? 4 : 1; /* CKM_IBM_CPACF_WRAP */
prep_head(&req_pl->head, req_pl_size, api, 33); /* WrapKey */
req_pl->var_tag = 0x04;
req_pl->var_len = sizeof(u32);
/* mech is mech + mech params (iv here) */
req_pl->mech_tag = 0x04;
req_pl->mech_len = sizeof(u32) + (iv ? 16 : 0);
req_pl->mech = (mech ? mech : 0x80060001); /* CKM_IBM_CPACF_WRAP */
p = ((u8 *) req_pl) + sizeof(*req_pl);
if (iv) {
memcpy(p, iv, 16);
p += 16;
}
/* key blob */
p += asn1tag_write(p, 0x04, key, keysize);
/* maybe the key argument needs the head data cleaned out */
kb = (struct ep11keyblob *)(p - keysize);
if (kb->head.version == TOKVER_EP11_AES)
memset(&kb->head, 0, sizeof(kb->head));
/* empty kek tag */
*p++ = 0x04;
*p++ = 0;
/* empty mac tag */
*p++ = 0x04;
*p++ = 0;
/* reply cprb and payload */
rep = alloc_cprb(sizeof(struct wk_rep_pl));
if (!rep)
goto out;
rep_pl = (struct wk_rep_pl *) (((u8 *) rep) + sizeof(*rep));
/* urb and target */
urb = kmalloc(sizeof(struct ep11_urb), GFP_KERNEL);
if (!urb)
goto out;
target.ap_id = card;
target.dom_id = domain;
prep_urb(urb, &target, 1,
req, sizeof(*req) + req_pl_size,
rep, sizeof(*rep) + sizeof(*rep_pl));
rc = _zcrypt_send_ep11_cprb(urb);
if (rc) {
DEBUG_ERR(
"%s zcrypt_send_ep11_cprb(card=%d dom=%d) failed, rc=%d\n",
__func__, (int) card, (int) domain, rc);
goto out;
}
rc = check_reply_pl((u8 *)rep_pl, __func__);
if (rc)
goto out;
if (rep_pl->data_tag != 0x04 || rep_pl->data_lenfmt != 0x82) {
DEBUG_ERR("%s unknown reply data format\n", __func__);
rc = -EIO;
goto out;
}
if (rep_pl->data_len > *datasize) {
DEBUG_ERR("%s mismatch reply data len / data buffer len\n",
__func__);
rc = -ENOSPC;
goto out;
}
/* copy the data from the cprb to the data buffer */
memcpy(databuf, rep_pl->data, rep_pl->data_len);
*datasize = rep_pl->data_len;
out:
kfree(req);
kfree(rep);
kfree(urb);
return rc;
}
int ep11_clr2keyblob(u16 card, u16 domain, u32 keybitsize, u32 keygenflags,
const u8 *clrkey, u8 *keybuf, size_t *keybufsize)
{
int rc;
struct ep11keyblob *kb;
u8 encbuf[64], *kek = NULL;
size_t clrkeylen, keklen, encbuflen = sizeof(encbuf);
if (keybitsize == 128 || keybitsize == 192 || keybitsize == 256)
clrkeylen = keybitsize / 8;
else {
DEBUG_ERR(
"%s unknown/unsupported keybitsize %d\n",
__func__, keybitsize);
return -EINVAL;
}
/* allocate memory for the temp kek */
keklen = MAXEP11AESKEYBLOBSIZE;
kek = kmalloc(keklen, GFP_ATOMIC);
if (!kek) {
rc = -ENOMEM;
goto out;
}
/* Step 1: generate AES 256 bit random kek key */
rc = ep11_genaeskey(card, domain, 256,
0x00006c00, /* EN/DECRYTP, WRAP/UNWRAP */
kek, &keklen);
if (rc) {
DEBUG_ERR(
"%s generate kek key failed, rc=%d\n",
__func__, rc);
goto out;
}
kb = (struct ep11keyblob *) kek;
memset(&kb->head, 0, sizeof(kb->head));
/* Step 2: encrypt clear key value with the kek key */
rc = ep11_cryptsingle(card, domain, 0, 0, def_iv, kek, keklen,
clrkey, clrkeylen, encbuf, &encbuflen);
if (rc) {
DEBUG_ERR(
"%s encrypting key value with kek key failed, rc=%d\n",
__func__, rc);
goto out;
}
/* Step 3: import the encrypted key value as a new key */
rc = ep11_unwrapkey(card, domain, kek, keklen,
encbuf, encbuflen, 0, def_iv,
keybitsize, 0, keybuf, keybufsize);
if (rc) {
DEBUG_ERR(
"%s importing key value as new key failed,, rc=%d\n",
__func__, rc);
goto out;
}
out:
kfree(kek);
return rc;
}
EXPORT_SYMBOL(ep11_clr2keyblob);
int ep11_key2protkey(u16 card, u16 dom, const u8 *key, size_t keylen,
u8 *protkey, u32 *protkeylen, u32 *protkeytype)
{
int rc = -EIO;
u8 *wkbuf = NULL;
size_t wkbuflen = 256;
struct wk_info {
u16 version;
u8 res1[16];
u32 pkeytype;
u32 pkeybitsize;
u64 pkeysize;
u8 res2[8];
u8 pkey[0];
} __packed * wki;
/* alloc temp working buffer */
wkbuf = kmalloc(wkbuflen, GFP_ATOMIC);
if (!wkbuf)
return -ENOMEM;
/* ep11 secure key -> protected key + info */
rc = ep11_wrapkey(card, dom, key, keylen,
0, def_iv, wkbuf, &wkbuflen);
if (rc) {
DEBUG_ERR(
"%s rewrapping ep11 key to pkey failed, rc=%d\n",
__func__, rc);
goto out;
}
wki = (struct wk_info *) wkbuf;
/* check struct version and pkey type */
if (wki->version != 1 || wki->pkeytype != 1) {
DEBUG_ERR("%s wk info version %d or pkeytype %d mismatch.\n",
__func__, (int) wki->version, (int) wki->pkeytype);
rc = -EIO;
goto out;
}
/* copy the tanslated protected key */
switch (wki->pkeysize) {
case 16+32:
/* AES 128 protected key */
if (protkeytype)
*protkeytype = PKEY_KEYTYPE_AES_128;
break;
case 24+32:
/* AES 192 protected key */
if (protkeytype)
*protkeytype = PKEY_KEYTYPE_AES_192;
break;
case 32+32:
/* AES 256 protected key */
if (protkeytype)
*protkeytype = PKEY_KEYTYPE_AES_256;
break;
default:
DEBUG_ERR("%s unknown/unsupported pkeysize %d\n",
__func__, (int) wki->pkeysize);
rc = -EIO;
goto out;
}
memcpy(protkey, wki->pkey, wki->pkeysize);
if (protkeylen)
*protkeylen = (u32) wki->pkeysize;
rc = 0;
out:
kfree(wkbuf);
return rc;
}
EXPORT_SYMBOL(ep11_key2protkey);
int ep11_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain,
int minhwtype, int minapi, const u8 *wkvp)
{
struct zcrypt_device_status_ext *device_status;
u32 *_apqns = NULL, _nr_apqns = 0;
int i, card, dom, rc = -ENOMEM;
struct ep11_domain_info edi;
struct ep11_card_info eci;
/* fetch status of all crypto cards */
device_status = kvmalloc_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);
/* allocate 1k space for up to 256 apqns */
_apqns = kmalloc_array(256, sizeof(u32), GFP_KERNEL);
if (!_apqns) {
kvfree(device_status);
return -ENOMEM;
}
/* walk through all the crypto apqnss */
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);
/* check online state */
if (!device_status[i].online)
continue;
/* check for ep11 functions */
if (!(device_status[i].functions & 0x01))
continue;
/* check cardnr */
if (cardnr != 0xFFFF && card != cardnr)
continue;
/* check domain */
if (domain != 0xFFFF && dom != domain)
continue;
/* check min hardware type */
if (minhwtype && device_status[i].hwtype < minhwtype)
continue;
/* check min api version if given */
if (minapi > 0) {
if (ep11_get_card_info(card, &eci, 0))
continue;
if (minapi > eci.API_ord_nr)
continue;
}
/* check wkvp if given */
if (wkvp) {
if (ep11_get_domain_info(card, dom, &edi))
continue;
if (edi.cur_wk_state != '1')
continue;
if (memcmp(wkvp, edi.cur_wkvp, 16))
continue;
}
/* apqn passed all filtering criterons, add to the array */
if (_nr_apqns < 256)
_apqns[_nr_apqns++] = (((u16)card) << 16) | ((u16) dom);
}
/* nothing found ? */
if (!_nr_apqns) {
kfree(_apqns);
rc = -ENODEV;
} else {
/* no re-allocation, simple return the _apqns array */
*apqns = _apqns;
*nr_apqns = _nr_apqns;
rc = 0;
}
kvfree(device_status);
return rc;
}
EXPORT_SYMBOL(ep11_findcard2);
void __exit zcrypt_ep11misc_exit(void)
{
card_cache_free();
}
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