pkey_api.c 30.1 KB
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/*
 *  pkey device driver
 *
 *  Copyright IBM Corp. 2017
 *  Author(s): Harald Freudenberger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 */

#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 <asm/zcrypt.h>
#include <asm/cpacf.h>
#include <asm/pkey.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

/*
 * 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);
}

/* 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;

/*
 * 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.
 */
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static int check_secaeskeytoken(const u8 *token, int keybitsize)
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{
	struct secaeskeytoken *t = (struct secaeskeytoken *) token;

	if (t->type != 0x01) {
		DEBUG_ERR(
			"check_secaeskeytoken secure token check failed, type mismatch 0x%02x != 0x01\n",
			(int) t->type);
		return -EINVAL;
	}
	if (t->version != 0x04) {
		DEBUG_ERR(
			"check_secaeskeytoken secure token check failed, version mismatch 0x%02x != 0x04\n",
			(int) t->version);
		return -EINVAL;
	}
	if (keybitsize > 0 && t->bitsize != keybitsize) {
		DEBUG_ERR(
			"check_secaeskeytoken secure token check failed, bitsize mismatch %d != %d\n",
			(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 = kmalloc(2 * cprbplusparamblen, GFP_KERNEL);
	if (!cprbmem)
		return -ENOMEM;
	memset(cprbmem, 0, 2 * cprbplusparamblen);

	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;
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	pxcrb->request_control_blk_addr = (void __user *) preqcblk;
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	pxcrb->reply_control_blk_length = preqcblk->rpl_msgbl;
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	pxcrb->reply_control_blk_addr = (void __user *) prepcblk;
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}

/*
 * 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(
			"pkey_genseckey unknown/unsupported keytype %d\n",
			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(
			"pkey_genseckey zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n",
			(int) cardnr, (int) domain, rc);
		goto out;
	}

	/* check response returncode and reasoncode */
	if (prepcblk->ccp_rtcode != 0) {
		DEBUG_ERR(
			"pkey_genseckey secure key generate failure, card response %d/%d\n",
			(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(
			"pkey_genseckey secure token size mismatch %d != %d bytes\n",
			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(
			"pkey_clr2seckey unknown/unsupported keytype %d\n",
			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(
			"pkey_clr2seckey zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n",
			(int) cardnr, (int) domain, rc);
		goto out;
	}

	/* check response returncode and reasoncode */
	if (prepcblk->ccp_rtcode != 0) {
		DEBUG_ERR(
			"pkey_clr2seckey clear key import failure, card response %d/%d\n",
			(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(
			"pkey_clr2seckey secure token size mismatch %d != %d bytes\n",
			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(
			"pkey_sec2protkey zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n",
			(int) cardnr, (int) domain, rc);
		goto out;
	}

	/* check response returncode and reasoncode */
	if (prepcblk->ccp_rtcode != 0) {
		DEBUG_ERR(
			"pkey_sec2protkey unwrap secure key failure, card response %d/%d\n",
			(int) prepcblk->ccp_rtcode,
			(int) prepcblk->ccp_rscode);
		rc = -EIO;
		goto out;
	}
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	if (prepcblk->ccp_rscode != 0) {
		DEBUG_WARN(
			"pkey_sec2protkey unwrap secure key warning, card response %d/%d\n",
			(int) prepcblk->ccp_rtcode,
			(int) prepcblk->ccp_rscode);
	}
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	/* 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(
			"pkey_sec2protkey reply param keyblock version mismatch 0x%02x != 0x01\n",
			(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("pkey_sec2protkey unknown/unsupported keytype %d\n",
			  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("pkey_clr2protkey unknown/unsupported keytype %d\n",
			  keytype);
		return -EINVAL;
	}

	/* 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);
	strncpy(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(
			"query_crypto_facility zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n",
			(int) cardnr, (int) domain, rc);
		goto out;
	}

	/* check response returncode and reasoncode */
	if (prepcblk->ccp_rtcode != 0) {
		DEBUG_ERR(
			"query_crypto_facility unwrap secure key failure, card response %d/%d\n",
			(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;
}

/*
770 771
 * Fetch the current and old mkvp values via
 * query_crypto_facility from adapter.
772
 */
773
static int fetch_mkvp(u16 cardnr, u16 domain, u64 mkvp[2])
774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
{
	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) {
789
		if (rarray[8*8] == '2') {
790
			/* current master key state is valid */
791 792
			mkvp[0] = *((u64 *)(varray + 184));
			mkvp[1] = *((u64 *)(varray + 172));
793 794 795 796 797 798 799 800 801 802 803 804 805 806
			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;
807
	u64 mkvp[2];
808 809 810 811 812 813
};

/* a list with mkvp_info entries */
static LIST_HEAD(mkvp_list);
static DEFINE_SPINLOCK(mkvp_list_lock);

814
static int mkvp_cache_fetch(u16 cardnr, u16 domain, u64 mkvp[2])
815 816 817 818 819 820 821 822
{
	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) {
823
			memcpy(mkvp, ptr->mkvp, 2 * sizeof(u64));
824 825 826 827 828 829 830 831 832
			rc = 0;
			break;
		}
	}
	spin_unlock_bh(&mkvp_list_lock);

	return rc;
}

833
static void mkvp_cache_update(u16 cardnr, u16 domain, u64 mkvp[2])
834 835 836 837 838 839 840 841
{
	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) {
842
			memcpy(ptr->mkvp, mkvp, 2 * sizeof(u64));
843 844 845 846 847 848 849 850 851 852 853 854
			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;
855
		memcpy(ptr->mkvp, mkvp, 2 * sizeof(u64));
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
		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_matrix *device_matrix;
	u16 card, dom;
899 900
	u64 mkvp[2];
	int i, rc, oi = -1;
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920

	/* mkvp must not be zero */
	if (t->mkvp == 0)
		return -EINVAL;

	/* fetch status of all crypto cards */
	device_matrix = kmalloc(sizeof(struct zcrypt_device_matrix),
				GFP_KERNEL);
	if (!device_matrix)
		return -ENOMEM;
	zcrypt_device_status_mask(device_matrix);

	/* walk through all crypto cards */
	for (i = 0; i < MAX_ZDEV_ENTRIES; i++) {
		card = AP_QID_CARD(device_matrix->device[i].qid);
		dom = AP_QID_QUEUE(device_matrix->device[i].qid);
		if (device_matrix->device[i].online &&
		    device_matrix->device[i].functions & 0x04) {
			/* an enabled CCA Coprocessor card */
			/* try cached mkvp */
921 922
			if (mkvp_cache_fetch(card, dom, mkvp) == 0 &&
			    t->mkvp == mkvp[0]) {
923 924 925
				if (!verify)
					break;
				/* verify: fetch mkvp from adapter */
926
				if (fetch_mkvp(card, dom, mkvp) == 0) {
927
					mkvp_cache_update(card, dom, mkvp);
928
					if (t->mkvp == mkvp[0])
929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
						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) {
		/* nothing found, so this time without cache */
		for (i = 0; i < MAX_ZDEV_ENTRIES; i++) {
			if (!(device_matrix->device[i].online &&
			      device_matrix->device[i].functions & 0x04))
				continue;
			card = AP_QID_CARD(device_matrix->device[i].qid);
			dom = AP_QID_QUEUE(device_matrix->device[i].qid);
			/* fresh fetch mkvp from adapter */
947
			if (fetch_mkvp(card, dom, mkvp) == 0) {
948
				mkvp_cache_update(card, dom, mkvp);
949
				if (t->mkvp == mkvp[0])
950
					break;
951 952
				if (t->mkvp == mkvp[1] && oi < 0)
					oi = i;
953 954
			}
		}
955 956 957 958 959
		if (i >= MAX_ZDEV_ENTRIES && oi >= 0) {
			/* old mkvp matched, use this card then */
			card = AP_QID_CARD(device_matrix->device[oi].qid);
			dom = AP_QID_QUEUE(device_matrix->device[oi].qid);
		}
960
	}
961
	if (i < MAX_ZDEV_ENTRIES || oi >= 0) {
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
		if (pcardnr)
			*pcardnr = card;
		if (pdomain)
			*pdomain = dom;
		rc = 0;
	} else
		rc = -ENODEV;

	kfree(device_matrix);
	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("pkey_skey2pkey failed rc=%d\n", rc);

	return rc;
}
EXPORT_SYMBOL(pkey_skey2pkey);

1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
/*
 * 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]) {
		DEBUG_DBG("pkey_verifykey secure key has old mkvp\n");
		if (pattributes)
			*pattributes |= PKEY_VERIFY_ATTR_OLD_MKVP;
	}

	if (pcardnr)
		*pcardnr = cardnr;
	if (pdomain)
		*pdomain = domain;

out:
	DEBUG_DBG("pkey_verifykey rc=%d\n", rc);
	return rc;
}
EXPORT_SYMBOL(pkey_verifykey);

1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
/*
 * 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("pkey_ioctl pkey_genseckey()=%d\n", 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("pkey_ioctl pkey_clr2seckey()=%d\n", 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("pkey_ioctl pkey_sec2protkey()=%d\n", 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("pkey_ioctl pkey_clr2protkey()=%d\n", 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("pkey_ioctl pkey_findcard()=%d\n", 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("pkey_ioctl pkey_skey2pkey()=%d\n", rc);
		if (rc)
			break;
		if (copy_to_user(usp, &ksp, sizeof(ksp)))
			return -EFAULT;
		break;
	}
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
	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("pkey_ioctl pkey_verifykey()=%d\n", rc);
		if (rc)
			break;
		if (copy_to_user(uvk, &kvk, sizeof(kvk)))
			return -EFAULT;
		break;
	}
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
	default:
		/* unknown/unsupported ioctl cmd */
		return -ENOTTY;
	}

	return rc;
}

/*
 * Sysfs and file io operations
 */
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,
};

/*
 * Module init
 */
1197
static int __init pkey_init(void)
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
{
	cpacf_mask_t pckmo_functions;

	/* check for pckmo instructions available */
	if (!cpacf_query(CPACF_PCKMO, &pckmo_functions))
		return -EOPNOTSUPP;
	if (!cpacf_test_func(&pckmo_functions, CPACF_PCKMO_ENC_AES_128_KEY) ||
	    !cpacf_test_func(&pckmo_functions, CPACF_PCKMO_ENC_AES_192_KEY) ||
	    !cpacf_test_func(&pckmo_functions, CPACF_PCKMO_ENC_AES_256_KEY))
		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_init(pkey_init);
module_exit(pkey_exit);