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linux-stable/drivers/s390/crypto/zcrypt_pcicc.c
Heiko Carstens a53c8fab3f s390/comments: unify copyright messages and remove file names 
Remove the file name from the comment at top of many files. In most
cases the file name was wrong anyway, so it's rather pointless.

Also unify the IBM copyright statement. We did have a lot of sightly
different statements and wanted to change them one after another
whenever a file gets touched. However that never happened. Instead
people start to take the old/"wrong" statements to use as a template
for new files.
So unify all of them in one go.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2012-07-20 11:15:04 +02:00

615 lines
18 KiB
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/*
* zcrypt 2.1.0
*
* Copyright IBM Corp. 2001, 2006
* Author(s): Robert Burroughs
* Eric Rossman (edrossma@us.ibm.com)
*
* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Ralph Wuerthner <rwuerthn@de.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/err.h>
#include <linux/atomic.h>
#include <asm/uaccess.h>
#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_error.h"
#include "zcrypt_pcicc.h"
#include "zcrypt_cca_key.h"
#define PCICC_MIN_MOD_SIZE 64 /* 512 bits */
#define PCICC_MAX_MOD_SIZE_OLD 128 /* 1024 bits */
#define PCICC_MAX_MOD_SIZE 256 /* 2048 bits */
/*
* PCICC cards need a speed rating of 0. This keeps them at the end of
* the zcrypt device list (see zcrypt_api.c). PCICC cards are only
* used if no other cards are present because they are slow and can only
* cope with PKCS12 padded requests. The logic is queer. PKCS11 padded
* requests are rejected. The modexpo function encrypts PKCS12 padded data
* and decrypts any non-PKCS12 padded data (except PKCS11) in the assumption
* that it's encrypted PKCS12 data. The modexpo_crt function always decrypts
* the data in the assumption that its PKCS12 encrypted data.
*/
#define PCICC_SPEED_RATING 0
#define PCICC_MAX_MESSAGE_SIZE 0x710 /* max size type6 v1 crt message */
#define PCICC_MAX_RESPONSE_SIZE 0x710 /* max size type86 v1 reply */
#define PCICC_CLEANUP_TIME (15*HZ)
static struct ap_device_id zcrypt_pcicc_ids[] = {
{ AP_DEVICE(AP_DEVICE_TYPE_PCICC) },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(ap, zcrypt_pcicc_ids);
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("PCICC Cryptographic Coprocessor device driver, "
"Copyright IBM Corp. 2001, 2006");
MODULE_LICENSE("GPL");
static int zcrypt_pcicc_probe(struct ap_device *ap_dev);
static void zcrypt_pcicc_remove(struct ap_device *ap_dev);
static void zcrypt_pcicc_receive(struct ap_device *, struct ap_message *,
struct ap_message *);
static struct ap_driver zcrypt_pcicc_driver = {
.probe = zcrypt_pcicc_probe,
.remove = zcrypt_pcicc_remove,
.ids = zcrypt_pcicc_ids,
.request_timeout = PCICC_CLEANUP_TIME,
};
/**
* The following is used to initialize the CPRB passed to the PCICC card
* in a type6 message. The 3 fields that must be filled in at execution
* time are req_parml, rpl_parml and usage_domain. Note that all three
* fields are *little*-endian. Actually, everything about this interface
* is ascii/little-endian, since the device has 'Intel inside'.
*
* The CPRB is followed immediately by the parm block.
* The parm block contains:
* - function code ('PD' 0x5044 or 'PK' 0x504B)
* - rule block (0x0A00 'PKCS-1.2' or 0x0A00 'ZERO-PAD')
* - VUD block
*/
static struct CPRB static_cprb = {
.cprb_len = __constant_cpu_to_le16(0x0070),
.cprb_ver_id = 0x41,
.func_id = {0x54,0x32},
.checkpoint_flag= 0x01,
.svr_namel = __constant_cpu_to_le16(0x0008),
.svr_name = {'I','C','S','F',' ',' ',' ',' '}
};
/**
* Check the message for PKCS11 padding.
*/
static inline int is_PKCS11_padded(unsigned char *buffer, int length)
{
int i;
if ((buffer[0] != 0x00) || (buffer[1] != 0x01))
return 0;
for (i = 2; i < length; i++)
if (buffer[i] != 0xFF)
break;
if (i < 10 || i == length)
return 0;
if (buffer[i] != 0x00)
return 0;
return 1;
}
/**
* Check the message for PKCS12 padding.
*/
static inline int is_PKCS12_padded(unsigned char *buffer, int length)
{
int i;
if ((buffer[0] != 0x00) || (buffer[1] != 0x02))
return 0;
for (i = 2; i < length; i++)
if (buffer[i] == 0x00)
break;
if ((i < 10) || (i == length))
return 0;
if (buffer[i] != 0x00)
return 0;
return 1;
}
/**
* Convert a ICAMEX message to a type6 MEX message.
*
* @zdev: crypto device pointer
* @zreq: crypto request pointer
* @mex: pointer to user input data
*
* Returns 0 on success or -EFAULT.
*/
static int ICAMEX_msg_to_type6MEX_msg(struct zcrypt_device *zdev,
struct ap_message *ap_msg,
struct ica_rsa_modexpo *mex)
{
static struct type6_hdr static_type6_hdr = {
.type = 0x06,
.offset1 = 0x00000058,
.agent_id = {0x01,0x00,0x43,0x43,0x41,0x2D,0x41,0x50,
0x50,0x4C,0x20,0x20,0x20,0x01,0x01,0x01},
.function_code = {'P','K'},
};
static struct function_and_rules_block static_pke_function_and_rules ={
.function_code = {'P','K'},
.ulen = __constant_cpu_to_le16(10),
.only_rule = {'P','K','C','S','-','1','.','2'}
};
struct {
struct type6_hdr hdr;
struct CPRB cprb;
struct function_and_rules_block fr;
unsigned short length;
char text[0];
} __attribute__((packed)) *msg = ap_msg->message;
int vud_len, pad_len, size;
/* VUD.ciphertext */
if (copy_from_user(msg->text, mex->inputdata, mex->inputdatalength))
return -EFAULT;
if (is_PKCS11_padded(msg->text, mex->inputdatalength))
return -EINVAL;
/* static message header and f&r */
msg->hdr = static_type6_hdr;
msg->fr = static_pke_function_and_rules;
if (is_PKCS12_padded(msg->text, mex->inputdatalength)) {
/* strip the padding and adjust the data length */
pad_len = strnlen(msg->text + 2, mex->inputdatalength - 2) + 3;
if (pad_len <= 9 || pad_len >= mex->inputdatalength)
return -ENODEV;
vud_len = mex->inputdatalength - pad_len;
memmove(msg->text, msg->text + pad_len, vud_len);
msg->length = cpu_to_le16(vud_len + 2);
/* Set up key after the variable length text. */
size = zcrypt_type6_mex_key_en(mex, msg->text + vud_len, 0);
if (size < 0)
return size;
size += sizeof(*msg) + vud_len; /* total size of msg */
} else {
vud_len = mex->inputdatalength;
msg->length = cpu_to_le16(2 + vud_len);
msg->hdr.function_code[1] = 'D';
msg->fr.function_code[1] = 'D';
/* Set up key after the variable length text. */
size = zcrypt_type6_mex_key_de(mex, msg->text + vud_len, 0);
if (size < 0)
return size;
size += sizeof(*msg) + vud_len; /* total size of msg */
}
/* message header, cprb and f&r */
msg->hdr.ToCardLen1 = (size - sizeof(msg->hdr) + 3) & -4;
msg->hdr.FromCardLen1 = PCICC_MAX_RESPONSE_SIZE - sizeof(msg->hdr);
msg->cprb = static_cprb;
msg->cprb.usage_domain[0]= AP_QID_QUEUE(zdev->ap_dev->qid);
msg->cprb.req_parml = cpu_to_le16(size - sizeof(msg->hdr) -
sizeof(msg->cprb));
msg->cprb.rpl_parml = cpu_to_le16(msg->hdr.FromCardLen1);
ap_msg->length = (size + 3) & -4;
return 0;
}
/**
* Convert a ICACRT message to a type6 CRT message.
*
* @zdev: crypto device pointer
* @zreq: crypto request pointer
* @crt: pointer to user input data
*
* Returns 0 on success or -EFAULT.
*/
static int ICACRT_msg_to_type6CRT_msg(struct zcrypt_device *zdev,
struct ap_message *ap_msg,
struct ica_rsa_modexpo_crt *crt)
{
static struct type6_hdr static_type6_hdr = {
.type = 0x06,
.offset1 = 0x00000058,
.agent_id = {0x01,0x00,0x43,0x43,0x41,0x2D,0x41,0x50,
0x50,0x4C,0x20,0x20,0x20,0x01,0x01,0x01},
.function_code = {'P','D'},
};
static struct function_and_rules_block static_pkd_function_and_rules ={
.function_code = {'P','D'},
.ulen = __constant_cpu_to_le16(10),
.only_rule = {'P','K','C','S','-','1','.','2'}
};
struct {
struct type6_hdr hdr;
struct CPRB cprb;
struct function_and_rules_block fr;
unsigned short length;
char text[0];
} __attribute__((packed)) *msg = ap_msg->message;
int size;
/* VUD.ciphertext */
msg->length = cpu_to_le16(2 + crt->inputdatalength);
if (copy_from_user(msg->text, crt->inputdata, crt->inputdatalength))
return -EFAULT;
if (is_PKCS11_padded(msg->text, crt->inputdatalength))
return -EINVAL;
/* Set up key after the variable length text. */
size = zcrypt_type6_crt_key(crt, msg->text + crt->inputdatalength, 0);
if (size < 0)
return size;
size += sizeof(*msg) + crt->inputdatalength; /* total size of msg */
/* message header, cprb and f&r */
msg->hdr = static_type6_hdr;
msg->hdr.ToCardLen1 = (size - sizeof(msg->hdr) + 3) & -4;
msg->hdr.FromCardLen1 = PCICC_MAX_RESPONSE_SIZE - sizeof(msg->hdr);
msg->cprb = static_cprb;
msg->cprb.usage_domain[0] = AP_QID_QUEUE(zdev->ap_dev->qid);
msg->cprb.req_parml = msg->cprb.rpl_parml =
cpu_to_le16(size - sizeof(msg->hdr) - sizeof(msg->cprb));
msg->fr = static_pkd_function_and_rules;
ap_msg->length = (size + 3) & -4;
return 0;
}
/**
* Copy results from a type 86 reply message back to user space.
*
* @zdev: crypto device pointer
* @reply: reply AP message.
* @data: pointer to user output data
* @length: size of user output data
*
* Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error.
*/
struct type86_reply {
struct type86_hdr hdr;
struct type86_fmt2_ext fmt2;
struct CPRB cprb;
unsigned char pad[4]; /* 4 byte function code/rules block ? */
unsigned short length;
char text[0];
} __attribute__((packed));
static int convert_type86(struct zcrypt_device *zdev,
struct ap_message *reply,
char __user *outputdata,
unsigned int outputdatalength)
{
static unsigned char static_pad[] = {
0x00,0x02,
0x1B,0x7B,0x5D,0xB5,0x75,0x01,0x3D,0xFD,
0x8D,0xD1,0xC7,0x03,0x2D,0x09,0x23,0x57,
0x89,0x49,0xB9,0x3F,0xBB,0x99,0x41,0x5B,
0x75,0x21,0x7B,0x9D,0x3B,0x6B,0x51,0x39,
0xBB,0x0D,0x35,0xB9,0x89,0x0F,0x93,0xA5,
0x0B,0x47,0xF1,0xD3,0xBB,0xCB,0xF1,0x9D,
0x23,0x73,0x71,0xFF,0xF3,0xF5,0x45,0xFB,
0x61,0x29,0x23,0xFD,0xF1,0x29,0x3F,0x7F,
0x17,0xB7,0x1B,0xA9,0x19,0xBD,0x57,0xA9,
0xD7,0x95,0xA3,0xCB,0xED,0x1D,0xDB,0x45,
0x7D,0x11,0xD1,0x51,0x1B,0xED,0x71,0xE9,
0xB1,0xD1,0xAB,0xAB,0x21,0x2B,0x1B,0x9F,
0x3B,0x9F,0xF7,0xF7,0xBD,0x63,0xEB,0xAD,
0xDF,0xB3,0x6F,0x5B,0xDB,0x8D,0xA9,0x5D,
0xE3,0x7D,0x77,0x49,0x47,0xF5,0xA7,0xFD,
0xAB,0x2F,0x27,0x35,0x77,0xD3,0x49,0xC9,
0x09,0xEB,0xB1,0xF9,0xBF,0x4B,0xCB,0x2B,
0xEB,0xEB,0x05,0xFF,0x7D,0xC7,0x91,0x8B,
0x09,0x83,0xB9,0xB9,0x69,0x33,0x39,0x6B,
0x79,0x75,0x19,0xBF,0xBB,0x07,0x1D,0xBD,
0x29,0xBF,0x39,0x95,0x93,0x1D,0x35,0xC7,
0xC9,0x4D,0xE5,0x97,0x0B,0x43,0x9B,0xF1,
0x16,0x93,0x03,0x1F,0xA5,0xFB,0xDB,0xF3,
0x27,0x4F,0x27,0x61,0x05,0x1F,0xB9,0x23,
0x2F,0xC3,0x81,0xA9,0x23,0x71,0x55,0x55,
0xEB,0xED,0x41,0xE5,0xF3,0x11,0xF1,0x43,
0x69,0x03,0xBD,0x0B,0x37,0x0F,0x51,0x8F,
0x0B,0xB5,0x89,0x5B,0x67,0xA9,0xD9,0x4F,
0x01,0xF9,0x21,0x77,0x37,0x73,0x79,0xC5,
0x7F,0x51,0xC1,0xCF,0x97,0xA1,0x75,0xAD,
0x35,0x9D,0xD3,0xD3,0xA7,0x9D,0x5D,0x41,
0x6F,0x65,0x1B,0xCF,0xA9,0x87,0x91,0x09
};
struct type86_reply *msg = reply->message;
unsigned short service_rc, service_rs;
unsigned int reply_len, pad_len;
char *data;
service_rc = le16_to_cpu(msg->cprb.ccp_rtcode);
if (unlikely(service_rc != 0)) {
service_rs = le16_to_cpu(msg->cprb.ccp_rscode);
if (service_rc == 8 && service_rs == 66)
return -EINVAL;
if (service_rc == 8 && service_rs == 65)
return -EINVAL;
if (service_rc == 8 && service_rs == 770) {
zdev->max_mod_size = PCICC_MAX_MOD_SIZE_OLD;
return -EAGAIN;
}
if (service_rc == 8 && service_rs == 783) {
zdev->max_mod_size = PCICC_MAX_MOD_SIZE_OLD;
return -EAGAIN;
}
if (service_rc == 8 && service_rs == 72)
return -EINVAL;
zdev->online = 0;
return -EAGAIN; /* repeat the request on a different device. */
}
data = msg->text;
reply_len = le16_to_cpu(msg->length) - 2;
if (reply_len > outputdatalength)
return -EINVAL;
/*
* For all encipher requests, the length of the ciphertext (reply_len)
* will always equal the modulus length. For MEX decipher requests
* the output needs to get padded. Minimum pad size is 10.
*
* Currently, the cases where padding will be added is for:
* - PCIXCC_MCL2 using a CRT form token (since PKD didn't support
* ZERO-PAD and CRT is only supported for PKD requests)
* - PCICC, always
*/
pad_len = outputdatalength - reply_len;
if (pad_len > 0) {
if (pad_len < 10)
return -EINVAL;
/* 'restore' padding left in the PCICC/PCIXCC card. */
if (copy_to_user(outputdata, static_pad, pad_len - 1))
return -EFAULT;
if (put_user(0, outputdata + pad_len - 1))
return -EFAULT;
}
/* Copy the crypto response to user space. */
if (copy_to_user(outputdata + pad_len, data, reply_len))
return -EFAULT;
return 0;
}
static int convert_response(struct zcrypt_device *zdev,
struct ap_message *reply,
char __user *outputdata,
unsigned int outputdatalength)
{
struct type86_reply *msg = reply->message;
/* Response type byte is the second byte in the response. */
switch (msg->hdr.type) {
case TYPE82_RSP_CODE:
case TYPE88_RSP_CODE:
return convert_error(zdev, reply);
case TYPE86_RSP_CODE:
if (msg->hdr.reply_code)
return convert_error(zdev, reply);
if (msg->cprb.cprb_ver_id == 0x01)
return convert_type86(zdev, reply,
outputdata, outputdatalength);
/* no break, incorrect cprb version is an unknown response */
default: /* Unknown response type, this should NEVER EVER happen */
zdev->online = 0;
return -EAGAIN; /* repeat the request on a different device. */
}
}
/**
* This function is called from the AP bus code after a crypto request
* "msg" has finished with the reply message "reply".
* It is called from tasklet context.
* @ap_dev: pointer to the AP device
* @msg: pointer to the AP message
* @reply: pointer to the AP reply message
*/
static void zcrypt_pcicc_receive(struct ap_device *ap_dev,
struct ap_message *msg,
struct ap_message *reply)
{
static struct error_hdr error_reply = {
.type = TYPE82_RSP_CODE,
.reply_code = REP82_ERROR_MACHINE_FAILURE,
};
struct type86_reply *t86r;
int length;
/* Copy the reply message to the request message buffer. */
if (IS_ERR(reply)) {
memcpy(msg->message, &error_reply, sizeof(error_reply));
goto out;
}
t86r = reply->message;
if (t86r->hdr.type == TYPE86_RSP_CODE &&
t86r->cprb.cprb_ver_id == 0x01) {
length = sizeof(struct type86_reply) + t86r->length - 2;
length = min(PCICC_MAX_RESPONSE_SIZE, length);
memcpy(msg->message, reply->message, length);
} else
memcpy(msg->message, reply->message, sizeof error_reply);
out:
complete((struct completion *) msg->private);
}
static atomic_t zcrypt_step = ATOMIC_INIT(0);
/**
* The request distributor calls this function if it picked the PCICC
* device to handle a modexpo request.
* @zdev: pointer to zcrypt_device structure that identifies the
* PCICC device to the request distributor
* @mex: pointer to the modexpo request buffer
*/
static long zcrypt_pcicc_modexpo(struct zcrypt_device *zdev,
struct ica_rsa_modexpo *mex)
{
struct ap_message ap_msg;
struct completion work;
int rc;
ap_init_message(&ap_msg);
ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
if (!ap_msg.message)
return -ENOMEM;
ap_msg.receive = zcrypt_pcicc_receive;
ap_msg.length = PAGE_SIZE;
ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
atomic_inc_return(&zcrypt_step);
ap_msg.private = &work;
rc = ICAMEX_msg_to_type6MEX_msg(zdev, &ap_msg, mex);
if (rc)
goto out_free;
init_completion(&work);
ap_queue_message(zdev->ap_dev, &ap_msg);
rc = wait_for_completion_interruptible(&work);
if (rc == 0)
rc = convert_response(zdev, &ap_msg, mex->outputdata,
mex->outputdatalength);
else
/* Signal pending. */
ap_cancel_message(zdev->ap_dev, &ap_msg);
out_free:
free_page((unsigned long) ap_msg.message);
return rc;
}
/**
* The request distributor calls this function if it picked the PCICC
* device to handle a modexpo_crt request.
* @zdev: pointer to zcrypt_device structure that identifies the
* PCICC device to the request distributor
* @crt: pointer to the modexpoc_crt request buffer
*/
static long zcrypt_pcicc_modexpo_crt(struct zcrypt_device *zdev,
struct ica_rsa_modexpo_crt *crt)
{
struct ap_message ap_msg;
struct completion work;
int rc;
ap_init_message(&ap_msg);
ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
if (!ap_msg.message)
return -ENOMEM;
ap_msg.receive = zcrypt_pcicc_receive;
ap_msg.length = PAGE_SIZE;
ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
atomic_inc_return(&zcrypt_step);
ap_msg.private = &work;
rc = ICACRT_msg_to_type6CRT_msg(zdev, &ap_msg, crt);
if (rc)
goto out_free;
init_completion(&work);
ap_queue_message(zdev->ap_dev, &ap_msg);
rc = wait_for_completion_interruptible(&work);
if (rc == 0)
rc = convert_response(zdev, &ap_msg, crt->outputdata,
crt->outputdatalength);
else
/* Signal pending. */
ap_cancel_message(zdev->ap_dev, &ap_msg);
out_free:
free_page((unsigned long) ap_msg.message);
return rc;
}
/**
* The crypto operations for a PCICC card.
*/
static struct zcrypt_ops zcrypt_pcicc_ops = {
.rsa_modexpo = zcrypt_pcicc_modexpo,
.rsa_modexpo_crt = zcrypt_pcicc_modexpo_crt,
};
/**
* Probe function for PCICC cards. It always accepts the AP device
* since the bus_match already checked the hardware type.
* @ap_dev: pointer to the AP device.
*/
static int zcrypt_pcicc_probe(struct ap_device *ap_dev)
{
struct zcrypt_device *zdev;
int rc;
zdev = zcrypt_device_alloc(PCICC_MAX_RESPONSE_SIZE);
if (!zdev)
return -ENOMEM;
zdev->ap_dev = ap_dev;
zdev->ops = &zcrypt_pcicc_ops;
zdev->online = 1;
zdev->user_space_type = ZCRYPT_PCICC;
zdev->type_string = "PCICC";
zdev->min_mod_size = PCICC_MIN_MOD_SIZE;
zdev->max_mod_size = PCICC_MAX_MOD_SIZE;
zdev->speed_rating = PCICC_SPEED_RATING;
zdev->max_exp_bit_length = PCICC_MAX_MOD_SIZE;
ap_dev->reply = &zdev->reply;
ap_dev->private = zdev;
rc = zcrypt_device_register(zdev);
if (rc)
goto out_free;
return 0;
out_free:
ap_dev->private = NULL;
zcrypt_device_free(zdev);
return rc;
}
/**
* This is called to remove the extended PCICC driver information
* if an AP device is removed.
*/
static void zcrypt_pcicc_remove(struct ap_device *ap_dev)
{
struct zcrypt_device *zdev = ap_dev->private;
zcrypt_device_unregister(zdev);
}
int __init zcrypt_pcicc_init(void)
{
return ap_driver_register(&zcrypt_pcicc_driver, THIS_MODULE, "pcicc");
}
void zcrypt_pcicc_exit(void)
{
ap_driver_unregister(&zcrypt_pcicc_driver);
}
module_init(zcrypt_pcicc_init);
module_exit(zcrypt_pcicc_exit);
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