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fa226f1d81
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Link: https://lkml.kernel.org/r/20200221150612.GA9717@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
219 lines
7.7 KiB
C
219 lines
7.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright IBM Corp. 2019
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* Author(s): Harald Freudenberger <freude@linux.ibm.com>
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* Ingo Franzki <ifranzki@linux.ibm.com>
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*
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* Collection of CCA misc functions used by zcrypt and pkey
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*/
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#ifndef _ZCRYPT_CCAMISC_H_
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#define _ZCRYPT_CCAMISC_H_
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#include <asm/zcrypt.h>
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#include <asm/pkey.h>
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/* Key token types */
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#define TOKTYPE_NON_CCA 0x00 /* Non-CCA key token */
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#define TOKTYPE_CCA_INTERNAL 0x01 /* CCA internal key token */
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/* For TOKTYPE_NON_CCA: */
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#define TOKVER_PROTECTED_KEY 0x01 /* Protected key token */
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#define TOKVER_CLEAR_KEY 0x02 /* Clear key token */
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/* For TOKTYPE_CCA_INTERNAL: */
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#define TOKVER_CCA_AES 0x04 /* CCA AES key token */
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#define TOKVER_CCA_VLSC 0x05 /* var length sym cipher key token */
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/* Max size of a cca variable length cipher key token */
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#define MAXCCAVLSCTOKENSIZE 725
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/* header part of a CCA key token */
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struct keytoken_header {
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u8 type; /* one of the TOKTYPE values */
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u8 res0[1];
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u16 len; /* vlsc token: total length in bytes */
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u8 version; /* one of the TOKVER values */
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u8 res1[3];
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} __packed;
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/* inside view of a CCA secure key token (only type 0x01 version 0x04) */
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struct secaeskeytoken {
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u8 type; /* 0x01 for internal key token */
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u8 res0[3];
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u8 version; /* should be 0x04 */
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u8 res1[1];
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u8 flag; /* key flags */
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u8 res2[1];
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u64 mkvp; /* master key verification pattern */
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u8 key[32]; /* key value (encrypted) */
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u8 cv[8]; /* control vector */
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u16 bitsize; /* key bit size */
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u16 keysize; /* key byte size */
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u8 tvv[4]; /* token validation value */
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} __packed;
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/* inside view of a variable length symmetric cipher AES key token */
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struct cipherkeytoken {
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u8 type; /* 0x01 for internal key token */
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u8 res0[1];
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u16 len; /* total key token length in bytes */
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u8 version; /* should be 0x05 */
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u8 res1[3];
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u8 kms; /* key material state, 0x03 means wrapped with MK */
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u8 kvpt; /* key verification pattern type, should be 0x01 */
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u64 mkvp0; /* master key verification pattern, lo part */
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u64 mkvp1; /* master key verification pattern, hi part (unused) */
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u8 eskwm; /* encrypted section key wrapping method */
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u8 hashalg; /* hash algorithmus used for wrapping key */
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u8 plfver; /* pay load format version */
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u8 res2[1];
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u8 adsver; /* associated data section version */
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u8 res3[1];
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u16 adslen; /* associated data section length */
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u8 kllen; /* optional key label length */
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u8 ieaslen; /* optional extended associated data length */
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u8 uadlen; /* optional user definable associated data length */
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u8 res4[1];
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u16 wpllen; /* wrapped payload length in bits: */
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/* plfver 0x00 0x01 */
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/* AES-128 512 640 */
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/* AES-192 576 640 */
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/* AES-256 640 640 */
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u8 res5[1];
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u8 algtype; /* 0x02 for AES cipher */
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u16 keytype; /* 0x0001 for 'cipher' */
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u8 kufc; /* key usage field count */
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u16 kuf1; /* key usage field 1 */
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u16 kuf2; /* key usage field 2 */
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u8 kmfc; /* key management field count */
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u16 kmf1; /* key management field 1 */
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u16 kmf2; /* key management field 2 */
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u16 kmf3; /* key management field 3 */
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u8 vdata[]; /* variable part data follows */
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} __packed;
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/* Some defines for the CCA AES cipherkeytoken kmf1 field */
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#define KMF1_XPRT_SYM 0x8000
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#define KMF1_XPRT_UASY 0x4000
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#define KMF1_XPRT_AASY 0x2000
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#define KMF1_XPRT_RAW 0x1000
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#define KMF1_XPRT_CPAC 0x0800
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#define KMF1_XPRT_DES 0x0080
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#define KMF1_XPRT_AES 0x0040
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#define KMF1_XPRT_RSA 0x0008
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/*
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* Simple check if the token is a valid CCA secure AES data key
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* token. If keybitsize is given, the bitsize of the key is
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* also checked. Returns 0 on success or errno value on failure.
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*/
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int cca_check_secaeskeytoken(debug_info_t *dbg, int dbflvl,
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const u8 *token, int keybitsize);
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/*
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* Simple check if the token is a valid CCA secure AES cipher key
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* token. If keybitsize is given, the bitsize of the key is
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* also checked. If checkcpacfexport is enabled, the key is also
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* checked for the export flag to allow CPACF export.
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* Returns 0 on success or errno value on failure.
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*/
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int cca_check_secaescipherkey(debug_info_t *dbg, int dbflvl,
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const u8 *token, int keybitsize,
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int checkcpacfexport);
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/*
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* Generate (random) CCA AES DATA secure key.
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*/
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int cca_genseckey(u16 cardnr, u16 domain, u32 keybitsize, u8 *seckey);
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/*
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* Generate CCA AES DATA secure key with given clear key value.
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*/
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int cca_clr2seckey(u16 cardnr, u16 domain, u32 keybitsize,
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const u8 *clrkey, u8 *seckey);
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/*
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* Derive proteced key from an CCA AES DATA secure key.
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*/
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int cca_sec2protkey(u16 cardnr, u16 domain,
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const u8 seckey[SECKEYBLOBSIZE],
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u8 *protkey, u32 *protkeylen, u32 *protkeytype);
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/*
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* Generate (random) CCA AES CIPHER secure key.
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*/
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int cca_gencipherkey(u16 cardnr, u16 domain, u32 keybitsize, u32 keygenflags,
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u8 *keybuf, size_t *keybufsize);
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/*
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* Derive proteced key from CCA AES cipher secure key.
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*/
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int cca_cipher2protkey(u16 cardnr, u16 domain, const u8 *ckey,
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u8 *protkey, u32 *protkeylen, u32 *protkeytype);
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/*
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* Build CCA AES CIPHER secure key with a given clear key value.
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*/
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int cca_clr2cipherkey(u16 cardnr, u16 domain, u32 keybitsize, u32 keygenflags,
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const u8 *clrkey, u8 *keybuf, size_t *keybufsize);
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/*
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* Query cryptographic facility from CCA adapter
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*/
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int cca_query_crypto_facility(u16 cardnr, u16 domain,
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const char *keyword,
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u8 *rarray, size_t *rarraylen,
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u8 *varray, size_t *varraylen);
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/*
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* Search for a matching crypto card based on the Master Key
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* Verification Pattern provided inside a secure key.
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* Works with CCA AES data and cipher keys.
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* Returns < 0 on failure, 0 if CURRENT MKVP matches and
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* 1 if OLD MKVP matches.
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*/
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int cca_findcard(const u8 *key, u16 *pcardnr, u16 *pdomain, int verify);
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/*
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* Build a list of cca apqns meeting the following constrains:
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* - apqn is online and is in fact a CCA apqn
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* - if cardnr is not FFFF only apqns with this cardnr
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* - if domain is not FFFF only apqns with this domainnr
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* - if minhwtype > 0 only apqns with hwtype >= minhwtype
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* - if cur_mkvp != 0 only apqns where cur_mkvp == mkvp
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* - if old_mkvp != 0 only apqns where old_mkvp == mkvp
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* - if verify is enabled and a cur_mkvp and/or old_mkvp
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* value is given, then refetch the cca_info and make sure the current
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* cur_mkvp or old_mkvp values of the apqn are used.
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* The array of apqn entries is allocated with kmalloc and returned in *apqns;
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* the number of apqns stored into the list is returned in *nr_apqns. One apqn
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* entry is simple a 32 bit value with 16 bit cardnr and 16 bit domain nr and
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* may be casted to struct pkey_apqn. The return value is either 0 for success
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* or a negative errno value. If no apqn meeting the criterias is found,
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* -ENODEV is returned.
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*/
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int cca_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain,
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int minhwtype, u64 cur_mkvp, u64 old_mkvp, int verify);
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/* struct to hold info for each CCA queue */
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struct cca_info {
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int hwtype; /* one of the defined AP_DEVICE_TYPE_* */
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char new_mk_state; /* '1' empty, '2' partially full, '3' full */
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char cur_mk_state; /* '1' invalid, '2' valid */
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char old_mk_state; /* '1' invalid, '2' valid */
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u64 new_mkvp; /* truncated sha256 hash of new master key */
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u64 cur_mkvp; /* truncated sha256 hash of current master key */
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u64 old_mkvp; /* truncated sha256 hash of old master key */
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char serial[9]; /* serial number string (8 ascii numbers + 0x00) */
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};
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/*
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* Fetch cca information about an CCA queue.
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*/
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int cca_get_info(u16 card, u16 dom, struct cca_info *ci, int verify);
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void zcrypt_ccamisc_exit(void);
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#endif /* _ZCRYPT_CCAMISC_H_ */
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