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s390-tools.19914
s390-tools-sles15sp2-27-zkey-Add-support-for-re...
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File s390-tools-sles15sp2-27-zkey-Add-support-for-re-enciphering-AES-CIPHER-keys.patch of Package s390-tools.19914
Subject: zkey: Add support for re-enciphering 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: 560b672bfad3c7bb6631ed4e1676a8b2c836e030 Problem-ID: SEC1717 Upstream-Description: zkey: Add support for re-enciphering AES CIPHER keys For secure keys of type CCA-AESCIPHER the CCA verb CSNBKTC2 (Key Token Change2) is used. CCA-AESDATA keys will continue to use CCA verb CSNBKTC (Key Token Change). 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/cca.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++------------ zkey/cca.h | 10 +++++++ 2 files changed, 76 insertions(+), 15 deletions(-) --- a/zkey/cca.c +++ b/zkey/cca.c @@ -142,6 +142,9 @@ int load_cca_library(struct cca_lib *cca /* Get the Key Token Change function */ cca->dll_CSNBKTC = (t_CSNBKTC)dlsym(cca->lib_csulcca, "CSNBKTC"); + /* Get the Key Token Change 2 function */ + cca->dll_CSNBKTC2 = (t_CSNBKTC2)dlsym(cca->lib_csulcca, "CSNBKTC2"); + /* Get the Cryptographic Facility Query function */ cca->dll_CSUACFQ = (t_CSUACFQ)dlsym(cca->lib_csulcca, "CSUACFQ"); @@ -153,6 +156,7 @@ int load_cca_library(struct cca_lib *cca if (cca->dll_CSUACFV == NULL || cca->dll_CSNBKTC == NULL || + cca->dll_CSNBKTC2 == NULL || cca->dll_CSUACFQ == NULL || cca->dll_CSUACRA == NULL || cca->dll_CSUACRD == NULL) { @@ -187,10 +191,13 @@ int key_token_change(struct cca_lib *cca u8 *secure_key, unsigned int secure_key_size, char *method, bool verbose) { + struct aescipherkeytoken *cipherkey = + (struct aescipherkeytoken *)secure_key; long exit_data_len = 0, rule_array_count; unsigned char rule_array[2 * 8] = { 0, }; unsigned char exit_data[4] = { 0, }; long return_code, reason_code; + long key_token_length; util_assert(cca != NULL, "Internal error: cca is NULL"); util_assert(secure_key != NULL, "Internal error: secure_key is NULL"); @@ -202,33 +209,77 @@ int key_token_change(struct cca_lib *cca memcpy(rule_array + 8, "AES ", 8); rule_array_count = 2; - cca->dll_CSNBKTC(&return_code, &reason_code, - &exit_data_len, exit_data, - &rule_array_count, rule_array, - secure_key); - - pr_verbose(verbose, "CSNBKTC (Key Token Change) with '%s' returned: " - "return_code: %ld, reason_code: %ld", method, return_code, - reason_code); - if (return_code != 0) { - print_CCA_error(return_code, reason_code); - return -EIO; - } - - if (secure_key_size == 2 * AESDATA_KEY_SIZE) { + if (is_cca_aes_data_key(secure_key, secure_key_size)) { cca->dll_CSNBKTC(&return_code, &reason_code, &exit_data_len, exit_data, &rule_array_count, rule_array, - secure_key + AESDATA_KEY_SIZE); + secure_key); pr_verbose(verbose, "CSNBKTC (Key Token Change) with '%s' " "returned: return_code: %ld, reason_code: %ld", method, return_code, reason_code); + } else if (is_cca_aes_cipher_key(secure_key, secure_key_size)) { + key_token_length = cipherkey->length; + cca->dll_CSNBKTC2(&return_code, &reason_code, + &exit_data_len, exit_data, + &rule_array_count, rule_array, + &key_token_length, + (unsigned char *)cipherkey); + + pr_verbose(verbose, "CSNBKTC2 (Key Token Change2) with '%s' " + "returned: return_code: %ld, reason_code: %ld", + method, return_code, reason_code); + + pr_verbose(verbose, "key_token_length: %lu", key_token_length); + } else { + warnx("Invalid key type specified"); + return -EINVAL; + } + + if (return_code != 0) { + print_CCA_error(return_code, reason_code); + return -EIO; + } + + if (is_xts_key(secure_key, secure_key_size)) { + if (is_cca_aes_data_key(secure_key, secure_key_size)) { + cca->dll_CSNBKTC(&return_code, &reason_code, + &exit_data_len, exit_data, + &rule_array_count, rule_array, + secure_key + AESDATA_KEY_SIZE); + + pr_verbose(verbose, "CSNBKTC (Key Token Change) with " + "'%s' returned: return_code: %ld, " + "reason_code: %ld", method, return_code, + reason_code); + } else if (is_cca_aes_cipher_key(secure_key, secure_key_size)) { + cipherkey = (struct aescipherkeytoken *)(secure_key + + AESCIPHER_KEY_SIZE); + key_token_length = cipherkey->length; + cca->dll_CSNBKTC2(&return_code, &reason_code, + &exit_data_len, exit_data, + &rule_array_count, rule_array, + &key_token_length, + (unsigned char *)cipherkey); + + pr_verbose(verbose, "CSNBKTC2 (Key Token Change2) with " + "'%s' returned: return_code: %ld, " + "reason_code: %ld", method, return_code, + reason_code); + + pr_verbose(verbose, "key_token_length: %lu", + key_token_length); + } else { + warnx("Invalid key type specified"); + return -EINVAL; + } + if (return_code != 0) { print_CCA_error(return_code, reason_code); return -EIO; } } + return 0; } --- a/zkey/cca.h +++ b/zkey/cca.h @@ -25,6 +25,15 @@ typedef void (*t_CSNBKTC)(long *return_c unsigned char *rule_array, unsigned char *key_identifier); +typedef void (*t_CSNBKTC2)(long *return_code, + long *reason_code, + long *exit_data_length, + unsigned char *exit_data, + long *rule_array_count, + unsigned char *rule_array, + long *key_identifier_length, + unsigned char *key_identifier); + typedef void (*t_CSUACFV)(long *return_code, long *reason_code, long *exit_data_length, @@ -68,6 +77,7 @@ struct cca_version { struct cca_lib { void *lib_csulcca; t_CSNBKTC dll_CSNBKTC; + t_CSNBKTC2 dll_CSNBKTC2; t_CSUACFV dll_CSUACFV; t_CSUACFQ dll_CSUACFQ; t_CSUACRA dll_CSUACRA;
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