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s390-tools.19914
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File s390-tools-sles15sp2-25-zkey-Add-support-for-generating-AES-CIPHER-keys.patch of Package s390-tools.19914
Subject: zkey: Add support for generating AES CIPHER keys From: Ingo Franzki <ifranzki@linux.ibm.com> Summary: zkey: Add support for CCA AES CIPHER keys Description: With CCA 5 there is a new secure key type, the so called variable length symmetric cipher key token. This token format can hold AES keys with size 128, 192 and 256 bits together with additional attributes cryptographic bound to the key token. The attributes may limit the usage of the key, for example restrict export or usability scope. So this key type is considered to be even more secure than the traditional secure key token. This key token type is also called "CCA AES CIPHER key", where the formerly used key token is called "CCA AES DATA key". The zkey as well as the zkey-cryptsetup tools are enhanced to support AES CIPHER keys. That is, zkey can manage AES DATA keys, as well as AES CIPHER keys. The key type must be specified at key generation time, the default is to generate AED DATA keys. Upstream-ID: b56c74fe7b6100b9a2ef17b8847cd850309cf487 Problem-ID: SEC1717 Upstream-Description: zkey: Add support for generating AES CIPHER keys Add support for generating secure keys using the new pkey IOCTLs. This allows to generate secure keys of type CCA-AESDATA as well as CCA-AESCIPHER, either by random inside the crypto card, or from a given clear key. Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com> Reviewed-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Jan Hoeppner <hoeppner@linux.ibm.com> Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com> --- zkey/keystore.c | 60 +------------ zkey/pkey.c | 258 +++++++++++++++++++++++++++++++++----------------------- zkey/pkey.h | 5 - zkey/zkey.c | 6 - 4 files changed, 168 insertions(+), 161 deletions(-) --- a/zkey/keystore.c +++ b/zkey/keystore.c @@ -1667,52 +1667,6 @@ out: } /** - * Extracts an online card/domain pair from the specified APQns. If none of the - * specified APQNs are online, then -ENODEV is returned. - * If no APQNs are specified at all, then it uses AUTOSELECT and returns zero. - */ -static int _keystore_get_card_domain(const char *apqns, unsigned int *card, - unsigned int *domain) -{ - struct apqn_check apqn_check = { .noonlinecheck = 0, .nomsg = 1 }; - char **apqn_list; - char *normalized = NULL; - int rc = 0; - int i; - - *card = AUTOSELECT; - *domain = AUTOSELECT; - - if (apqns == NULL) - return 0; - - apqn_list = str_list_split(apqns); - if (apqn_list[0] == NULL) - goto out; - - for (i = 0; apqn_list[i] != NULL; i++) { - rc = _keystore_apqn_check(apqn_list[i], 0, 0, &normalized, - &apqn_check); - if (normalized != NULL) - free(normalized); - if (rc == -EINVAL) - goto out; - if (rc != 0) - continue; - - if (sscanf(apqn_list[i], "%x.%x", card, domain) == 2) - goto found; - } - - warnx("None of the specified APQNs is online or of type CCA"); - rc = -ENODEV; -found: -out: - str_list_free_string_array(apqn_list); - return rc; -} - -/** * Generates a secure key by random and adds it to the key store * * @param[in] keystore the key store @@ -1748,7 +1702,7 @@ int keystore_generate_key(struct keystor { struct key_filenames file_names = { NULL, NULL, NULL }; struct properties *key_props = NULL; - unsigned int card, domain; + char **apqn_list = NULL; int rc; util_assert(keystore != NULL, "Internal error: keystore is NULL"); @@ -1776,21 +1730,21 @@ int keystore_generate_key(struct keystor goto out_free_key_filenames; } - rc = _keystore_get_card_domain(apqns, &card, &domain); - if (rc != 0) - goto out_free_key_filenames; + if (apqns != NULL) + apqn_list = str_list_split(apqns); if (clear_key_file == NULL) rc = generate_secure_key_random(pkey_fd, file_names.skey_filename, keybits, xts, key_type, - card, domain, + (const char **)apqn_list, keystore->verbose); else rc = generate_secure_key_clear(pkey_fd, file_names.skey_filename, keybits, xts, clear_key_file, - key_type, card, domain, + key_type, + (const char **)apqn_list, keystore->verbose); if (rc != 0) goto out_free_props; @@ -1812,6 +1766,8 @@ int keystore_generate_key(struct keystor file_names.info_filename); out_free_props: + if (apqn_list != NULL) + str_list_free_string_array(apqn_list); if (key_props != NULL) properties_free(key_props); if (rc != 0) --- a/zkey/pkey.c +++ b/zkey/pkey.c @@ -888,86 +888,109 @@ static size_t key_size_for_type(enum pke * @param[in] keybits the cryptographic size of the key in bits * @param[in] xts if true an XTS key is generated * @param[in] key_type the type of the key - * @param[in] card the card number to use (or AUTOSELECT) - * @param[in] domain the domain number to use (or AUTOSELECT) + * @param[in] apqns a zero terminated array of pointers to APQN-strings, + * or NULL for AUTOSELECT * @param[in] verbose if true, verbose messages are printed * * @returns 0 on success, a negative errno in case of an error */ int generate_secure_key_random(int pkey_fd, const char *keyfile, size_t keybits, bool xts, const char *key_type, - u16 card, u16 domain, bool verbose) + const char **apqns, bool verbose) { - struct pkey_genseck gensec; - size_t secure_key_size; - u8 *secure_key; + struct pkey_genseck2 genseck2; + size_t secure_key_size, size; + u8 *secure_key = NULL; int rc; util_assert(pkey_fd != -1, "Internal error: pkey_fd is -1"); util_assert(keyfile != NULL, "Internal error: keyfile is NULL"); util_assert(key_type != NULL, "Internal error: key_type is NULL"); - if (strcasecmp(key_type, KEY_TYPE_CCA_AESDATA) != 0) { - warnx("Invalid key-type: %s", key_type); - return -EINVAL; - } - if (keybits == 0) keybits = DEFAULT_KEYBITS; - secure_key_size = DOUBLE_KEYSIZE_FOR_XTS(AESDATA_KEY_SIZE, xts); - secure_key = util_malloc(secure_key_size); + pr_verbose(verbose, "Generate secure key by random"); - pr_verbose(verbose, "Generate key on card %02x.%04x", card, domain); + memset(&genseck2, 0, sizeof(genseck2)); - gensec.cardnr = card; - gensec.domain = domain; - switch (keybits) { - case 128: - gensec.keytype = PKEY_KEYTYPE_AES_128; - break; - case 192: - if (xts) { - warnx("Invalid value for '--keybits'|'-c' " - "for XTS: '%lu'", keybits); - rc = -EINVAL; - goto out; - } - gensec.keytype = PKEY_KEYTYPE_AES_192; - break; - case 256: - gensec.keytype = PKEY_KEYTYPE_AES_256; - break; - default: + genseck2.type = key_type_to_pkey_type(key_type); + if (genseck2.type == 0) { + warnx("Key-type not supported; %s", key_type); + return -ENOTSUP; + } + + genseck2.size = keybits_to_keysize(keybits); + if (genseck2.size == 0) { warnx("Invalid value for '--keybits'/'-c': '%lu'", keybits); - rc = -EINVAL; - goto out; + return -EINVAL; + } + if (keybits == 192 && xts) { + warnx("Invalid value for '--keybits'|'-c' " + "for XTS: '%lu'", keybits); + return -EINVAL; } - rc = ioctl(pkey_fd, PKEY_GENSECK, &gensec); - if (rc < 0) { - rc = -errno; - warnx("Failed to generate a secure key: %s", strerror(errno)); - warnx("Make sure that all available CCA crypto adapters are " - "setup with the same master key"); - goto out; + rc = build_apqn_list_for_key_type(pkey_fd, genseck2.type, apqns, + &genseck2.apqns, + &genseck2.apqn_entries, verbose); + if (rc != 0) { + if (rc == -ENODEV || rc == -ENOTSUP) + warnx("No APQN is available that can generate a secure " + "key of type %s", key_type); + else + warnx("Failed to build a list of APQNs that can " + "generate a secure key of type %s: %s", key_type, + strerror(-rc)); + return rc; } - memcpy(secure_key, &gensec.seckey, AESDATA_KEY_SIZE); + size = key_size_for_type(genseck2.type); + secure_key_size = DOUBLE_KEYSIZE_FOR_XTS(size, xts); + secure_key = util_zalloc(secure_key_size); + + genseck2.key = secure_key; + genseck2.keylen = size; + + rc = pkey_genseck2(pkey_fd, &genseck2, verbose); + if (rc != 0) { + warnx("Failed to generate a secure key: %s", strerror(-rc)); + goto out; + } if (xts) { - rc = ioctl(pkey_fd, PKEY_GENSECK, &gensec); - if (rc < 0) { - rc = -errno; - warnx("Failed to generate a secure key: %s", - strerror(errno)); - warnx("Make sure that all available CCA crypto " - "adapters are setup with the same master key"); + free(genseck2.apqns); + genseck2.apqns = NULL; + genseck2.apqn_entries = 0; + + /* + * Ensure to generate 2nd key with an APQN that has the same + * master key that is used by the 1st key. + */ + rc = build_apqn_list_for_key(pkey_fd, secure_key, size, + PKEY_FLAGS_MATCH_CUR_MKVP, apqns, + &genseck2.apqns, + &genseck2.apqn_entries, verbose); + if (rc != 0) { + if (rc == -ENODEV || rc == -ENOTSUP) + warnx("No APQN is available that can generate " + "a secure key of type %s", key_type); + else + warnx("Failed to build a list of APQNs that " + "can generate a secure key of type %s: " + "%s", key_type, strerror(-rc)); goto out; } - memcpy(secure_key + AESDATA_KEY_SIZE, &gensec.seckey, - AESDATA_KEY_SIZE); + genseck2.key = secure_key + size; + genseck2.keylen = size; + + rc = pkey_genseck2(pkey_fd, &genseck2, verbose); + if (rc != 0) { + warnx("Failed to generate a secure key: %s", + strerror(-rc)); + goto out; + } } pr_verbose(verbose, "Successfully generated a secure key"); @@ -975,6 +998,7 @@ int generate_secure_key_random(int pkey_ rc = write_secure_key(keyfile, secure_key, secure_key_size, verbose); out: + free(genseck2.apqns); free(secure_key); return rc; } @@ -991,8 +1015,8 @@ out: * @param[in] xts if true an XTS key is generated * @param[in] clearkeyfile the file name of the clear key to read * @param[in] key_type the type of the key - * @param[in] card the card number to use (or AUTOSELECT) - * @param[in] domain the domain number to use (or AUTOSELECT) + * @param[in] apqns a zero terminated array of pointers to APQN-strings, + * or NULL for AUTOSELECT * @param[in] verbose if true, verbose messages are printed * * @returns 0 on success, a negative errno in case of an error @@ -1000,14 +1024,14 @@ out: int generate_secure_key_clear(int pkey_fd, const char *keyfile, size_t keybits, bool xts, const char *clearkeyfile, const char *key_type, - u16 card, u16 domain, - bool verbose) + const char **apqns, bool verbose) { - struct pkey_clr2seck clr2sec; + struct pkey_clr2seck2 clr2seck2; size_t secure_key_size; size_t clear_key_size; u8 *secure_key; u8 *clear_key; + size_t size; int rc; util_assert(pkey_fd != -1, "Internal error: pkey_fd is -1"); @@ -1016,70 +1040,99 @@ int generate_secure_key_clear(int pkey_f "Internal error: clearkeyfile is NULL"); util_assert(key_type != NULL, "Internal error: key_type is NULL"); - if (strcasecmp(key_type, KEY_TYPE_CCA_AESDATA) != 0) { - warnx("Invalid key-type: %s", key_type); - return -EINVAL; - } - - secure_key_size = DOUBLE_KEYSIZE_FOR_XTS(AESDATA_KEY_SIZE, xts); - secure_key = util_malloc(secure_key_size); + pr_verbose(verbose, "Generate secure key from a clear key"); clear_key = read_clear_key(clearkeyfile, keybits, xts, &clear_key_size, verbose); if (clear_key == NULL) return -EINVAL; - pr_verbose(verbose, "Generate key on card %02x.%04x", card, domain); + memset(&clr2seck2, 0, sizeof(clr2seck2)); + + memcpy(&clr2seck2.clrkey, clear_key, + HALF_KEYSIZE_FOR_XTS(clear_key_size, xts)); + + clr2seck2.type = key_type_to_pkey_type(key_type); + if (clr2seck2.type == 0) { + warnx("Key-type not supported; %s", key_type); + return -ENOTSUP; + } - clr2sec.cardnr = card; - clr2sec.domain = domain; - switch (HALF_KEYSIZE_FOR_XTS(clear_key_size * 8, xts)) { - case 128: - clr2sec.keytype = PKEY_KEYTYPE_AES_128; - break; - case 192: - clr2sec.keytype = PKEY_KEYTYPE_AES_192; - break; - case 256: - clr2sec.keytype = PKEY_KEYTYPE_AES_256; - break; - default: + clr2seck2.size = keybits_to_keysize(HALF_KEYSIZE_FOR_XTS( + clear_key_size * 8, xts)); + if (clr2seck2.size == 0) { warnx("Invalid clear key size: '%lu' bytes", clear_key_size); - rc = -EINVAL; - goto out; + return -EINVAL; + } + if (keybits == 192 && xts) { + warnx("Invalid clear key size for XTS: '%lu' bytes", + clear_key_size); + return -EINVAL; } - memcpy(&clr2sec.clrkey, clear_key, - HALF_KEYSIZE_FOR_XTS(clear_key_size, xts)); + rc = build_apqn_list_for_key_type(pkey_fd, clr2seck2.type, apqns, + &clr2seck2.apqns, + &clr2seck2.apqn_entries, verbose); + if (rc != 0) { + if (rc == -ENODEV || rc == -ENOTSUP) + warnx("No APQN is available that can generate a secure " + "key of type %s", key_type); + else + warnx("Failed to build a list of APQNs that can " + "generate a secure key of type %s: %s", key_type, + strerror(-rc)); + return rc; + } - rc = ioctl(pkey_fd, PKEY_CLR2SECK, &clr2sec); - if (rc < 0) { - rc = -errno; - warnx("Failed to generate a secure key from a " - "clear key: %s", strerror(errno)); - warnx("Make sure that all available CCA crypto adapters are " - "setup with the same master key"); + size = key_size_for_type(clr2seck2.type); + secure_key_size = DOUBLE_KEYSIZE_FOR_XTS(size, xts); + secure_key = util_zalloc(secure_key_size); + + clr2seck2.key = secure_key; + clr2seck2.keylen = size; + + rc = pkey_clr2seck2(pkey_fd, &clr2seck2, verbose); + if (rc != 0) { + warnx("Failed to generate a secure key: %s", strerror(-rc)); goto out; } - memcpy(secure_key, &clr2sec.seckey, AESDATA_KEY_SIZE); - if (xts) { - memcpy(&clr2sec.clrkey, clear_key + clear_key_size / 2, + free(clr2seck2.apqns); + clr2seck2.apqns = NULL; + clr2seck2.apqn_entries = 0; + + memcpy(&clr2seck2.clrkey, clear_key + clear_key_size / 2, clear_key_size / 2); - rc = ioctl(pkey_fd, PKEY_CLR2SECK, &clr2sec); - if (rc < 0) { - rc = -errno; - warnx("Failed to generate a secure key from " - "a clear key: %s", strerror(errno)); - warnx("Make sure that all available CCA crypto " - "adapters are setup with the same master key"); + /* + * Ensure to generate 2nd key with an APQN that has the same + * master key that is used by the 1st key. + */ + rc = build_apqn_list_for_key(pkey_fd, secure_key, size, + PKEY_FLAGS_MATCH_CUR_MKVP, apqns, + &clr2seck2.apqns, + &clr2seck2.apqn_entries, verbose); + if (rc != 0) { + if (rc == -ENODEV || rc == -ENOTSUP) + warnx("No APQN is available that can generate " + "a secure key of type %s", key_type); + else + warnx("Failed to build a list of APQNs that " + "can generate a secure key of type %s: " + "%s", key_type, strerror(-rc)); goto out; } - memcpy(secure_key + AESDATA_KEY_SIZE, &clr2sec.seckey, - AESDATA_KEY_SIZE); + clr2seck2.key = secure_key + size; + clr2seck2.keylen = size; + + rc = pkey_clr2seck2(pkey_fd, &clr2seck2, verbose); + if (rc != 0) { + warnx("Failed to generate a secure key: %s", + strerror(-rc)); + goto out; + } } pr_verbose(verbose, @@ -1088,10 +1141,11 @@ int generate_secure_key_clear(int pkey_f rc = write_secure_key(keyfile, secure_key, secure_key_size, verbose); out: - memset(&clr2sec, 0, sizeof(clr2sec)); + memset(&clr2seck2, 0, sizeof(clr2seck2)); memset(clear_key, 0, clear_key_size); free(clear_key); free(secure_key); + free(clr2seck2.apqns); return rc; } --- a/zkey/pkey.h +++ b/zkey/pkey.h @@ -235,13 +235,12 @@ int open_pkey_device(bool verbose); int generate_secure_key_random(int pkey_fd, const char *keyfile, size_t keybits, bool xts, const char *key_type, - u16 card, u16 domain, bool verbose); + const char **apqns, bool verbose); int generate_secure_key_clear(int pkey_fd, const char *keyfile, size_t keybits, bool xts, const char *clearkeyfile, const char *key_type, - u16 card, u16 domain, - bool verbose); + const char **apqns, bool verbose); u8 *read_secure_key(const char *keyfile, size_t *secure_key_size, bool verbose); --- a/zkey/zkey.c +++ b/zkey/zkey.c @@ -1029,8 +1029,7 @@ static int command_generate_clear(void) rc = generate_secure_key_clear(g.pkey_fd, g.pos_arg, g.keybits, g.xts, g.clearkeyfile, g.key_type, - AUTOSELECT, AUTOSELECT, - g.verbose); + NULL, g.verbose); return rc != 0 ? EXIT_FAILURE : EXIT_SUCCESS; } @@ -1046,8 +1045,7 @@ static int command_generate_random(void) rc = generate_secure_key_random(g.pkey_fd, g.pos_arg, g.keybits, g.xts, g.key_type, - AUTOSELECT, AUTOSELECT, - g.verbose); + NULL, g.verbose); return rc != 0 ? EXIT_FAILURE : EXIT_SUCCESS; }
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