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s390-tools.16701
s390-tools-sles15sp2-33-zkey-Add-key-checks-whe...
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File s390-tools-sles15sp2-33-zkey-Add-key-checks-when-importing-a-CCA-AESCIPHER-k.patch of Package s390-tools.16701
Subject: zkey: Add key checks when importing a CCA-AESCIPHER key 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: 0d9e42264db9935e28f663802c5b95795af79160 Problem-ID: SEC1717 Upstream-Description: zkey: Add key checks when importing a CCA-AESCIPHER key Perform extended checks on a secure key that is imported into the key repository. Warn the user if the imported key is by any means insecure, e.g. has been originally created in an insecure way. Prompt the user to continue the import if a potential insecurity is detected. 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/keystore.h | 3 +- zkey/utils.c | 24 ++++++++++++++++++++++ zkey/utils.h | 2 + zkey/zkey.1 | 6 +++++ zkey/zkey.c | 2 - 6 files changed, 85 insertions(+), 12 deletions(-) --- a/zkey/keystore.c +++ b/zkey/keystore.c @@ -1801,18 +1801,21 @@ out_free_key_filenames: * default is used. * @param[in] import_file The name of a secure key containing the key to import * @param[in] volume_type the type of volume + * @param[in] cca the CCA library struct * * @returns 0 for success or a negative errno in case of an error */ int keystore_import_key(struct keystore *keystore, const char *name, const char *description, const char *volumes, const char *apqns, bool noapqncheck, size_t sector_size, - const char *import_file, const char *volume_type) + const char *import_file, const char *volume_type, + struct cca_lib *cca) { struct key_filenames file_names = { NULL, NULL, NULL }; struct properties *key_props = NULL; size_t secure_key_size; const char *key_type; + int selected = 1; u8 *secure_key; u64 mkvp; int rc; @@ -1862,6 +1865,51 @@ int keystore_import_key(struct keystore goto out_free_key; } + if (is_cca_aes_cipher_key(secure_key, secure_key_size)) { + if (cca->lib_csulcca == NULL) { + rc = load_cca_library(cca, keystore->verbose); + if (rc != 0) + goto out_free_key; + } + + rc = select_cca_adapter_by_mkvp(cca, mkvp, apqns, + FLAG_SEL_CCA_MATCH_CUR_MKVP | + FLAG_SEL_CCA_MATCH_OLD_MKVP, + keystore->verbose); + if (rc == -ENOTSUP) { + rc = 0; + selected = 0; + } + if (rc != 0) { + warnx("No APQN found that is suitable for " + "working with the secure AES key '%s'", name); + rc = 0; + goto out_free_key; + } + + rc = restrict_key_export(cca, secure_key, secure_key_size, + keystore->verbose); + if (rc != 0) { + warnx("Failed to export-restrict the imported secure " + "key: %s", strerror(-rc)); + if (!selected) + print_msg_for_cca_envvars("secure AES key"); + goto out_free_key; + } + + rc = check_aes_cipher_key(secure_key, secure_key_size); + if (rc != 0) { + warnx("The secure key to import might not be secure"); + printf("%s: Do you want to import it anyway [y/N]? ", + program_invocation_short_name); + if (!prompt_for_yes(keystore->verbose)) { + warnx("Operation aborted"); + rc = -ECANCELED; + goto out_free_key; + } + } + } + rc = write_secure_key(file_names.skey_filename, secure_key, secure_key_size, keystore->verbose); free(secure_key); @@ -3180,7 +3228,6 @@ static int _keystore_prompt_for_remove(s struct key_filenames *file_names) { struct properties *key_prop; - char str[20]; char *msg; int rc; @@ -3198,14 +3245,7 @@ static int _keystore_prompt_for_remove(s printf("%s: Remove key '%s' [y/N]? ", program_invocation_short_name, name); - if (fgets(str, sizeof(str), stdin) == NULL) { - rc = -EIO; - goto out; - } - if (str[strlen(str) - 1] == '\n') - str[strlen(str) - 1] = '\0'; - pr_verbose(keystore, "Prompt reply: '%s'", str); - if (strcasecmp(str, "y") != 0 && strcasecmp(str, "yes") != 0) { + if (!prompt_for_yes(keystore->verbose)) { warnx("Operation aborted"); rc = -ECANCELED; goto out; --- a/zkey/keystore.h +++ b/zkey/keystore.h @@ -37,7 +37,8 @@ int keystore_generate_key(struct keystor int keystore_import_key(struct keystore *keystore, const char *name, const char *description, const char *volumes, const char *apqns, bool noapqncheck, size_t sector_size, - const char *import_file, const char *volume_type); + const char *import_file, const char *volume_type, + struct cca_lib *cca); int keystore_change_key(struct keystore *keystore, const char *name, const char *description, const char *volumes, --- a/zkey/utils.c +++ b/zkey/utils.c @@ -793,3 +793,27 @@ int cross_check_apqns(const char *apqns, return rc; } + +/* + * Prompts for yes or no. Returns true if 'y' or 'yes' was entered. + * + * @param[in] verbose if true, verbose messages are printed + * + * @returns true if 'y' or 'yes' was entered (case insensitive). Returns false + * otherwise. + */ +bool prompt_for_yes(bool verbose) +{ + char str[20]; + + if (fgets(str, sizeof(str), stdin) == NULL) + return false; + + if (str[strlen(str) - 1] == '\n') + str[strlen(str) - 1] = '\0'; + pr_verbose(verbose, "Prompt reply: '%s'", str); + if (strcasecmp(str, "y") == 0 || strcasecmp(str, "yes") == 0) + return true; + + return false; +} --- a/zkey/utils.h +++ b/zkey/utils.h @@ -53,4 +53,6 @@ int print_mk_info(const char *apqns, boo int cross_check_apqns(const char *apqns, u64 mkvp, int min_level, bool print_mks, bool verbose); +bool prompt_for_yes(bool verbose); + #endif --- a/zkey/zkey.1 +++ b/zkey/zkey.1 @@ -349,6 +349,12 @@ additional information can be associated , or the .B \-\-sector-size options. +.PP +.B Note: +The \fBimport\fP command requires the CCA host library (libcsulcca.so) +to be installed when secure keys of type \fBCCA-AESCIPHER\fP are imported. +For the supported environments and downloads, see: +\fIhttp://www.ibm.com/security/cryptocards\fP . .SS "Export AES secure keys from the secure key repository" . --- a/zkey/zkey.c +++ b/zkey/zkey.c @@ -1522,7 +1522,7 @@ static int command_import(void) rc = keystore_import_key(g.keystore, g.name, g.description, g.volumes, g.apqns, g.noapqncheck, g.sector_size, - g.pos_arg, g.volume_type); + g.pos_arg, g.volume_type, &g.cca); return rc != 0 ? EXIT_FAILURE : EXIT_SUCCESS; }
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