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SUSE:SLE-15-SP1:GA
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s390-tools-sles15sp1-0004-zkey-Externalize-secu...
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File s390-tools-sles15sp1-0004-zkey-Externalize-secure-key-back-end-functions.patch of Package s390-tools
Subject: zkey: Externalize secure key back-end functions From: Philipp Rudo <prudo@linux.ibm.com> Summary: zkey: Add support of protected key crypto for dm-crypt. Description: Support the usage of protected key crypto for dm-crypt disks in plain format by providing a tool to manage a key repository allowing to associate secure keys with disk partitions or logical volumes. Upstream-ID: 5872f8a21ba222f9c32f0155ce1ac0f36c12cf39 Problem-ID: SEC1800 Upstream-Description: zkey: Externalize secure key back-end functions To reduce the size of the zkey.c source file, all routines that deal with secure keys are moved to a new source file pkey.c. Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> --- zkey/Makefile | 3 zkey/pkey.c | 748 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ zkey/pkey.h | 44 +++ zkey/zkey.c | 581 +++------------------------------------------ 4 files changed, 832 insertions(+), 544 deletions(-) --- a/zkey/Makefile +++ b/zkey/Makefile @@ -25,9 +25,10 @@ all: check_dep zkey libs = $(rootdir)/libutil/libutil.a zkey.o: zkey.c pkey.h misc.h +pkey.o: pkey.c pkey.h properties.o: properties.c properties.h -zkey: zkey.o properties.o $(libs) +zkey: zkey.o pkey.o properties.o $(libs) install: all $(INSTALL) -d -m 755 $(DESTDIR)$(USRBINDIR) --- /dev/null +++ b/zkey/pkey.c @@ -0,0 +1,748 @@ +/* + * zkey - Generate, re-encipher, and validate secure keys + * + * Copyright IBM Corp. 2018 + * + * s390-tools is free software; you can redistribute it and/or modify + * it under the terms of the MIT license. See LICENSE for details. + */ + +#include <dlfcn.h> +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <stdbool.h> +#include <string.h> +#include <stdint.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +#include "lib/util_base.h" +#include "lib/util_libc.h" +#include "lib/util_panic.h" + +#include "pkey.h" + + +#define pr_verbose(verbose, fmt...) do { \ + if (verbose) \ + warnx(fmt); \ + } while (0) + +#define DOUBLE_KEYSIZE_FOR_XTS(keysize, xts) ((xts) ? 2 * (keysize) : (keysize)) +#define HALF_KEYSIZE_FOR_XTS(keysize, xts) ((xts) ? (keysize) / 2 : (keysize)) + +/* + * Definitions for the CCA library + */ +#define CCA_LIBRARY_NAME "libcsulcca.so" + +#define DEFAULT_KEYBITS 256 + +/** + * Loads the CCA library and provides the entry point of the CSNBKTC function. + * + * @param[out] lib_csulcca on return this contains the address of the CCA + * library. dlclose() should be used to free this + * when no longer needed. + * @param[out] dll_CSNBKTC on return this contains the address of the + * CSNBKTC function. + * @param verbose if true, verbose messages are printed + * + * @returns 0 on success, -ELIBACC in case of library load errors + */ +int load_cca_library(void **lib_csulcca, t_CSNBKTC *dll_CSNBKTC, bool verbose) +{ + util_assert(lib_csulcca != NULL, "Internal error: lib_csulcca is NULL"); + util_assert(dll_CSNBKTC != NULL, "Internal error: dll_CSNBKTC is NULL"); + + /* Load the CCA library */ + *lib_csulcca = dlopen(CCA_LIBRARY_NAME, RTLD_GLOBAL | RTLD_NOW); + if (*lib_csulcca == NULL) { + warnx("%s\nEnsure that the IBM CCA Host Libraries and " + "Tools are installed properly", dlerror()); + return -ELIBACC; + } + + /* Get the Key Token Change function */ + *dll_CSNBKTC = (t_CSNBKTC)dlsym(*lib_csulcca, "CSNBKTC"); + if (*dll_CSNBKTC == NULL) { + warnx("%s\nEnsure that the IBM CCA Host Libraries and " + "Tools are installed properly", dlerror()); + dlclose(*lib_csulcca); + *lib_csulcca = NULL; + return -ELIBACC; + } + + pr_verbose(verbose, "CCA library '%s' has been loaded successfully", + CCA_LIBRARY_NAME); + return 0; +} + +/** + * Opens the pkey device and returns its file descriptor. + * + * @param verbose if true, verbose messages are printed + * + * @returns the file descriptor or -1 to indicate an error + */ +int open_pkey_device(bool verbose) +{ + int pkey_fd; + + pkey_fd = open(PKEYDEVICE, O_RDWR); + if (pkey_fd < 0) { + warnx("File '%s:' %s\nEnsure that the 'pkey' kernel module " + "is loaded", PKEYDEVICE, strerror(errno)); + return -1; + } + + pr_verbose(verbose, "Device '%s' has been opened successfully", + PKEYDEVICE); + return pkey_fd; +} + +/** + * Read a secure key file and return the allocated buffer and size. + * + * @param[in] keyfile the name of the file to read + * @param[out] secure_key_size on return, the size of the secure key read + * @param[in] verbose if true, verbose messages are printed + * + * @return a buffer containing the secure key, or NULL in case of an error. + * The returned buffer must be freed by the caller. + */ +u8 *read_secure_key(const char *keyfile, size_t *secure_key_size, + bool verbose) +{ + size_t count, size; + struct stat sb; + char *msg; + FILE *fp; + u8 *buf; + + util_assert(keyfile != NULL, "Internal error: keyfile is NULL"); + util_assert(secure_key_size != NULL, + "Internal error: secure_key_size is NULL"); + + if (stat(keyfile, &sb)) { + warnx("File '%s': %s", keyfile, strerror(errno)); + return NULL; + } + size = sb.st_size; + + if (size != SECURE_KEY_SIZE && size != 2*SECURE_KEY_SIZE) { + warnx("File '%s' has an invalid size, %lu or %lu bytes " + "expected", keyfile, SECURE_KEY_SIZE, + 2 * SECURE_KEY_SIZE); + return NULL; + } + + fp = fopen(keyfile, "r"); + if (fp == NULL) { + warnx("File '%s': %s", keyfile, strerror(errno)); + return NULL; + } + + buf = util_malloc(size); + count = fread(buf, 1, size, fp); + if (count <= 0) { + msg = feof(fp) ? "File is too small" : strerror(errno); + warnx("File '%s': %s", keyfile, msg); + free(buf); + buf = NULL; + goto out; + } + + *secure_key_size = size; + + if (verbose) { + pr_verbose(verbose, "%lu bytes read from file '%s'", size, + keyfile); + util_hexdump_grp(stderr, NULL, buf, 4, size, 0); + } +out: + fclose(fp); + return buf; +} + +/** + * Write a secure key file + * + * @param[in] keyfile the name of the file to write + * @param[in] secure_key a buffer containing the secure key + * @param[in] secure_key_size the size of the secure key + * @param[in] verbose if true, verbose messages are printed + * + * @returns 0 in case of success, -EIO in case of an error + */ +int write_secure_key(const char *keyfile, const u8 *secure_key, + size_t secure_key_size, bool verbose) +{ + size_t count; + FILE *fp; + + util_assert(keyfile != NULL, "Internal error: keyfile is NULL"); + util_assert(secure_key != NULL, "Internal error: secure_key is NULL"); + util_assert(secure_key_size > 0, + "Internal error: secure_key_size is zero"); + + fp = fopen(keyfile, "w"); + if (fp == NULL) { + warnx("File '%s': %s", keyfile, strerror(errno)); + return -EIO; + } + + count = fwrite(secure_key, 1, secure_key_size, fp); + if (count <= 0) { + warnx("File '%s': %s", keyfile, strerror(errno)); + fclose(fp); + return -EIO; + } + + if (verbose) { + pr_verbose(verbose, "%lu bytes written to file '%s'", + secure_key_size, keyfile); + util_hexdump_grp(stderr, NULL, secure_key, 4, + secure_key_size, 0); + } + fclose(fp); + return 0; +} + +/** + * Read a clear key file and return the allocated buffer and size + * + * @param[in] keyfile the name of the file to read + * @param[in] keybits the clear key size in bits. When keybits is 0, then + * the file size determines the keybits. + * @param[in] xts if true an XTS key is to be read + * @param[out] clear_key_size on return, the size of the clear key read + * @param[in] verbose if true, verbose messages are printed + * + * @return a buffer containing the clear key, or NULL in case of an error. + * The returned buffer must be freed by the caller. + */ +static u8 *read_clear_key(const char *keyfile, size_t keybits, bool xts, + size_t *clear_key_size, bool verbose) +{ + size_t count, size, expected_size; + struct stat sb; + char *msg; + FILE *fp; + u8 *buf; + + util_assert(keyfile != NULL, "Internal error: keyfile is NULL"); + util_assert(clear_key_size != NULL, + "Internal error: clear_key_size is NULL"); + + if (stat(keyfile, &sb)) { + warnx("File '%s': %s", keyfile, strerror(errno)); + return NULL; + } + size = sb.st_size; + + if (keybits != 0) { + expected_size = DOUBLE_KEYSIZE_FOR_XTS(keybits / 8, xts); + if (size != expected_size) { + warnx("File '%s' has an invalid size, " + "%lu bytes expected", keyfile, expected_size); + return NULL; + } + } else { + keybits = DOUBLE_KEYSIZE_FOR_XTS(size * 8, xts); + } + + switch (keybits) { + case 128: + break; + case 192: + if (xts) { + warnx("File '%s' has an invalid size, " + "192 bit keys are not supported with XTS", + keyfile); + return NULL; + } + break; + case 256: + break; + default: + if (xts) + warnx("File '%s' has an invalid size, " + "32 or 64 bytes expected", keyfile); + else + warnx("File '%s' has an invalid size, 16, 24 " + "or 32 bytes expected", keyfile); + return NULL; + } + + fp = fopen(keyfile, "r"); + if (fp == NULL) { + warnx("File '%s': %s", keyfile, strerror(errno)); + return NULL; + } + + buf = util_malloc(size); + count = fread(buf, 1, size, fp); + if (count <= 0) { + msg = feof(fp) ? "File is too small" : strerror(errno); + warnx("File '%s': %s", keyfile, msg); + free(buf); + buf = NULL; + goto out; + } + + *clear_key_size = size; + + if (verbose) { + pr_verbose(verbose, "%lu bytes read from file '%s'", size, + keyfile); + util_hexdump_grp(stderr, NULL, buf, 4, size, 0); + } +out: + fclose(fp); + return buf; +} + +/** + * Generate a secure key by random + * + * @param[in] pkey_fd the pkey file descriptor + * @param[in] keyfile the file name of the secure key to generate + * @param[in] keybits the cryptographic size of the key in bits + * @param[in] xts if true an XTS key is generated + * @param[in] card the card number to use (or AUTOSELECT) + * @param[in] domain the domain number to use (or 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, u16 card, u16 domain, + bool verbose) +{ + struct pkey_genseck gensec; + size_t secure_key_size; + u8 *secure_key; + int rc; + + util_assert(pkey_fd != -1, "Internal error: pkey_fd is -1"); + util_assert(keyfile != NULL, "Internal error: keyfile is NULL"); + + if (keybits == 0) + keybits = DEFAULT_KEYBITS; + + secure_key_size = DOUBLE_KEYSIZE_FOR_XTS(SECURE_KEY_SIZE, xts); + secure_key = util_malloc(secure_key_size); + + pr_verbose(verbose, "Generate key on card %02x.%04x", card, domain); + + 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: + warnx("Invalid value for '--keybits'/'-c': '%lu'", keybits); + rc = -EINVAL; + goto out; + } + + rc = ioctl(pkey_fd, PKEY_GENSECK, &gensec); + if (rc < 0) { + rc = -errno; + warnx("Failed to generate a secure key: %s", strerror(errno)); + goto out; + } + + memcpy(secure_key, &gensec.seckey, SECURE_KEY_SIZE); + + if (xts) { + rc = ioctl(pkey_fd, PKEY_GENSECK, &gensec); + if (rc < 0) { + rc = -errno; + warnx("Failed to generate a secure key: %s", + strerror(errno)); + goto out; + } + + memcpy(secure_key + SECURE_KEY_SIZE, &gensec.seckey, + SECURE_KEY_SIZE); + } + + pr_verbose(verbose, "Successfully generated a secure key"); + + rc = write_secure_key(keyfile, secure_key, secure_key_size, verbose); + +out: + free(secure_key); + return rc; +} + + +/* + * Generate a secure key from a clear key file + * + * @param[in] pkey_fd the pkey file descriptor + * @param[in] keyfile the file name of the secure key to generate + * @param[in] keybits the cryptographic size of the key in bits. When + * keybits is 0, then the clear key file size + * determines the keybits. + * @param[in] xts if true an XTS key is generated + * @param[in] clearkeyfile the file name of the clear key to read + * @param[in] card the card number to use (or AUTOSELECT) + * @param[in] domain the domain number to use (or 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_clear(int pkey_fd, const char *keyfile, + size_t keybits, bool xts, + const char *clearkeyfile, + u16 card, u16 domain, + bool verbose) +{ + struct pkey_clr2seck clr2sec; + size_t secure_key_size; + size_t clear_key_size; + u8 *secure_key; + u8 *clear_key; + int rc; + + util_assert(pkey_fd != -1, "Internal error: pkey_fd is -1"); + util_assert(keyfile != NULL, "Internal error: keyfile is NULL"); + util_assert(clearkeyfile != NULL, + "Internal error: clearkeyfile is NULL"); + + secure_key_size = DOUBLE_KEYSIZE_FOR_XTS(SECURE_KEY_SIZE, xts); + secure_key = util_malloc(secure_key_size); + + 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); + + 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: + warnx("Invalid clear key size: '%lu' bytes", clear_key_size); + rc = -EINVAL; + goto out; + } + + memcpy(&clr2sec.clrkey, clear_key, + HALF_KEYSIZE_FOR_XTS(clear_key_size, xts)); + + 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)); + goto out; + } + + memcpy(secure_key, &clr2sec.seckey, SECURE_KEY_SIZE); + + if (xts) { + memcpy(&clr2sec.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)); + goto out; + } + + memcpy(secure_key+SECURE_KEY_SIZE, &clr2sec.seckey, + SECURE_KEY_SIZE); + } + + pr_verbose(verbose, + "Successfully generated a secure key from a clear key"); + + rc = write_secure_key(keyfile, secure_key, secure_key_size, verbose); + +out: + memset(&clr2sec, 0, sizeof(clr2sec)); + memset(clear_key, 0, clear_key_size); + free(clear_key); + free(secure_key); + return rc; +} + +/** + * Prints CCA return and reason code information for certain known CCA + * error situations. + * + * @param return_code the CCA return code + * @param reason_code the CCA reason code + */ +static void print_CCA_error(int return_code, int reason_code) +{ + switch (return_code) { + case 8: + switch (reason_code) { + case 48: + warnx("The secure key has a CCA master key " + "verification pattern that is not valid"); + break; + } + break; + case 12: + switch (reason_code) { + case 764: + warnx("The CCA master key is not loaded and " + "therefore a secure key cannot be enciphered"); + break; + } + break; + } +} + +/** + * Re-enciphers a secure key. + * + * @param[in] dll_CSNBKTC the address of the CCA CSNBKTC function + * @param[in] secure_key a buffer containing the secure key + * @param[in] secure_key_size the size of the secure key + * @param[in] method the re-enciphering method. METHOD_OLD_TO_CURRENT + * or METHOD_CURRENT_TO_NEW. + * @param[in] verbose if true, verbose messages are printed + * + * @returns 0 on success, -EIO in case of an error + */ +int key_token_change(t_CSNBKTC dll_CSNBKTC, + u8 *secure_key, unsigned int secure_key_size, + char *method, bool verbose) +{ + long exit_data_len = 0, rule_array_count; + unsigned char rule_array[2 * 80] = { 0, }; + unsigned char exit_data[4] = { 0, }; + long return_code, reason_code; + + util_assert(dll_CSNBKTC != NULL, "Internal error: dll_CSNBKTC is NULL"); + util_assert(secure_key != NULL, "Internal error: secure_key is NULL"); + util_assert(secure_key_size > 0, + "Internal error: secure_key_size is 0"); + util_assert(method != NULL, "Internal error: method is NULL"); + + memcpy(rule_array, method, 8); + memcpy(rule_array + 8, "AES ", 8); + rule_array_count = 2; + + 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 * SECURE_KEY_SIZE) { + dll_CSNBKTC(&return_code, &reason_code, + &exit_data_len, exit_data, + &rule_array_count, rule_array, + secure_key + SECURE_KEY_SIZE); + + 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; + } + } + return 0; +} + +/** + * Validates an XTS secure key (the second part) + * + * @param[in] pkey_fd the pkey file descriptor + * @param[in] secure_key a buffer containing the secure key + * @param[in] secure_key_size the secure key size + * @param[in] part1_keysize the key size of the first key part + * @param[in] part1_attributes the attributes of the first key part + * @param[out] clear_key_bitsize on return , the cryptographic size of the + * clear key + * @param[in] verbose if true, verbose messages are printed + * + * @returns 0 on success, a negative errno in case of an error + */ +static int validate_secure_xts_key(int pkey_fd, + u8 *secure_key, size_t secure_key_size, + u16 part1_keysize, u32 part1_attributes, + size_t *clear_key_bitsize, bool verbose) +{ + struct secaeskeytoken *token = (struct secaeskeytoken *)secure_key; + struct pkey_verifykey verifykey; + struct secaeskeytoken *token2; + int rc; + + util_assert(pkey_fd != -1, "Internal error: pkey_fd is -1"); + util_assert(secure_key != NULL, "Internal error: secure_key is NULL"); + + /* XTS uses 2 secure key tokens concatenated to each other */ + token2 = (struct secaeskeytoken *)(secure_key + SECURE_KEY_SIZE); + + if (secure_key_size != 2 * SECURE_KEY_SIZE) { + pr_verbose(verbose, "Size of secure key is too small: " + "%lu expected %lu", secure_key_size, + 2 * SECURE_KEY_SIZE); + return -EINVAL; + } + + if (token->bitsize != token2->bitsize) { + pr_verbose(verbose, "XTS secure key contains 2 clear keys of " + "different sizes"); + return -EINVAL; + } + if (token->keysize != token2->keysize) { + pr_verbose(verbose, "XTS secure key contains 2 keys of " + "different sizes"); + return -EINVAL; + } + if (memcmp(&token->mkvp, &token2->mkvp, sizeof(token->mkvp)) != 0) { + pr_verbose(verbose, "XTS secure key contains 2 keys using " + "different CCA master keys"); + return -EINVAL; + } + + memcpy(&verifykey.seckey, token2, sizeof(verifykey.seckey)); + + rc = ioctl(pkey_fd, PKEY_VERIFYKEY, &verifykey); + if (rc < 0) { + rc = -errno; + pr_verbose(verbose, "Failed to validate a secure key: %s", + strerror(-rc)); + return rc; + } + + if ((verifykey.attributes & PKEY_VERIFY_ATTR_AES) == 0) { + pr_verbose(verbose, "Secure key is not an AES key"); + return -EINVAL; + } + + if (verifykey.keysize != part1_keysize) { + pr_verbose(verbose, "XTS secure key contains 2 keys using " + "different key sizes"); + return -EINVAL; + } + + if (verifykey.attributes != part1_attributes) { + pr_verbose(verbose, "XTS secure key contains 2 keys using " + "different attributes"); + return -EINVAL; + } + + if (clear_key_bitsize) + *clear_key_bitsize += verifykey.keysize; + + return 0; +} + +/** + * Validates a secure key + * + * @param[in] pkey_fd the pkey file descriptor + * @param[in] secure_key a buffer containing the secure key + * @param[in] secure_key_size the secure key size + * @param[out] clear_key_bitsize on return , the cryptographic size of the + * clear key + * @param[out] is_old_mk in return set to 1 to indicate if the secure key + * is currently enciphered by the OLD CCA master key + * @param[in] verbose if true, verbose messages are printed + * + * @returns 0 on success, a negative errno in case of an error + */ +int validate_secure_key(int pkey_fd, + u8 *secure_key, size_t secure_key_size, + size_t *clear_key_bitsize, int *is_old_mk, + bool verbose) +{ + struct secaeskeytoken *token = (struct secaeskeytoken *)secure_key; + struct pkey_verifykey verifykey; + int rc; + + util_assert(pkey_fd != -1, "Internal error: pkey_fd is -1"); + util_assert(secure_key != NULL, "Internal error: secure_key is NULL"); + + if (secure_key_size < SECURE_KEY_SIZE) { + pr_verbose(verbose, "Size of secure key is too small: " + "%lu expected %lu", secure_key_size, + SECURE_KEY_SIZE); + return -EINVAL; + } + + memcpy(&verifykey.seckey, token, sizeof(verifykey.seckey)); + + rc = ioctl(pkey_fd, PKEY_VERIFYKEY, &verifykey); + if (rc < 0) { + rc = -errno; + pr_verbose(verbose, "Failed to validate a secure key: %s", + strerror(-rc)); + return rc; + } + + if ((verifykey.attributes & PKEY_VERIFY_ATTR_AES) == 0) { + pr_verbose(verbose, "Secure key is not an AES key"); + return -EINVAL; + } + + if (clear_key_bitsize) + *clear_key_bitsize = verifykey.keysize; + + /* XTS uses 2 secure key tokens concatenated to each other */ + if (secure_key_size > SECURE_KEY_SIZE) { + rc = validate_secure_xts_key(pkey_fd, + secure_key, secure_key_size, + verifykey.keysize, + verifykey.attributes, + clear_key_bitsize, + verbose); + if (rc != 0) + return rc; + } + + if (is_old_mk) + *is_old_mk = (verifykey.attributes & + PKEY_VERIFY_ATTR_OLD_MKVP) != 0; + + pr_verbose(verbose, "Secure key validation completed successfully"); + + return 0; +} --- a/zkey/pkey.h +++ b/zkey/pkey.h @@ -4,7 +4,7 @@ * This header file defines the interface to the pkey kernel module. * It defines a set of IOCTL commands with its associated structures. * - * Copyright 2017 IBM Corp. + * Copyright IBM Corp. 2017, 2018 * * s390-tools is free software; you can redistribute it and/or modify * it under the terms of the MIT license. See LICENSE for details. @@ -82,4 +82,44 @@ struct pkey_verifykey { #define PKEY_VERIFYKEY _IOWR(PKEY_IOCTL_MAGIC, 0x07, struct pkey_verifykey) -#endif \ No newline at end of file +#define METHOD_OLD_TO_CURRENT "RTCMK " +#define METHOD_CURRENT_TO_NEW "RTNMK " + +typedef void (*t_CSNBKTC)(long *return_code, + long *reason_code, + long *exit_data_length, + unsigned char *exit_data, + long *rule_array_count, + unsigned char *rule_array, + unsigned char *key_identifier); + +int load_cca_library(void **lib_csulcca, t_CSNBKTC *dll_CSNBKTC, bool verbose); + +int open_pkey_device(bool verbose); + +int generate_secure_key_random(int pkey_fd, const char *keyfile, + size_t keybits, bool xts, u16 card, u16 domain, + bool verbose); + +int generate_secure_key_clear(int pkey_fd, const char *keyfile, + size_t keybits, bool xts, + const char *clearkeyfile, + u16 card, u16 domain, + bool verbose); + +u8 *read_secure_key(const char *keyfile, size_t *secure_key_size, + bool verbose); + +int write_secure_key(const char *keyfile, const u8 *secure_key, + size_t secure_key_size, bool verbose); + +int validate_secure_key(int pkey_fd, + u8 *secure_key, size_t secure_key_size, + size_t *clear_key_bitsize, int *is_old_mk, + bool verbose); + +int key_token_change(t_CSNBKTC dll_CSNBKTC, + u8 *secure_key, unsigned int secure_key_size, + char *method, bool verbose); + +#endif --- a/zkey/zkey.c +++ b/zkey/zkey.c @@ -188,9 +188,6 @@ static struct zkey_command zkey_commands #define pr_verbose(fmt...) if (g.verbose) \ warnx(fmt) -#define DOUBLE_KEYSIZE_FOR_XTS(keysize, xts) (xts) ? 2 * (keysize) : (keysize) -#define HALF_KEYSIZE_FOR_XTS(keysize, xts) (xts) ? (keysize) / 2 : (keysize) - static void print_usage_command(const struct zkey_command *command) { char command_str[ZKEY_COMMAND_STR_LEN]; @@ -253,19 +250,6 @@ static void print_help(const struct zkey } /* - * Definitions for the CCA library - */ -#define CCA_LIBRARY_NAME "libcsulcca.so" - -typedef void (*t_CSNBKTC)(long *return_code, - long *reason_code, - long *exit_data_length, - unsigned char *exit_data, - long *rule_array_count, - unsigned char *rule_array, - unsigned char *key_identifier); - -/* * Global variables for program options */ static struct zkey_globals { @@ -283,212 +267,6 @@ static struct zkey_globals { .pkey_fd = -1, }; -#define DEFAULT_KEYBITS 256 - -static int load_cca_library(void) -{ - /* Load the CCA library */ - g.lib_csulcca = dlopen(CCA_LIBRARY_NAME, RTLD_GLOBAL | RTLD_NOW); - if (g.lib_csulcca == NULL) { - warnx("%s\nEnsure that the IBM CCA Host Libraries and " - "Tools are installed properly", dlerror()); - return EXIT_FAILURE; - } - - /* Get the Key Token Change function */ - g.dll_CSNBKTC = (t_CSNBKTC)dlsym(g.lib_csulcca, "CSNBKTC"); - if (g.dll_CSNBKTC == NULL) { - warnx("%s\nEnsure that the IBM CCA Host Libraries and " - "Tools are installed properly", dlerror()); - dlclose(g.lib_csulcca); - g.lib_csulcca = NULL; - return EXIT_FAILURE; - } - - pr_verbose("CCA library '%s' has been loaded successfully", - CCA_LIBRARY_NAME); - - return EXIT_SUCCESS; -} - -static int open_pkey_device(void) -{ - g.pkey_fd = open(PKEYDEVICE, O_RDWR); - if (g.pkey_fd < 0) { - warnx("File '%s:' %s\nEnsure that the 'pkey' kernel module " - "is loaded", PKEYDEVICE, strerror(errno)); - return EXIT_FAILURE; - } - - pr_verbose("Device '%s' has been opened successfully", PKEYDEVICE); - - return EXIT_SUCCESS; -} - -/* - * Read a secure key file and return the allocated buffer and size - */ -static u8 *read_secure_key(const char *keyfile, size_t *secure_key_size) -{ - size_t count, size; - struct stat sb; - char *msg; - FILE *fp; - u8 *buf; - - if (stat(keyfile, &sb)) { - warnx("File '%s': %s", keyfile, strerror(errno)); - return NULL; - } - size = sb.st_size; - - if (size != SECURE_KEY_SIZE && size != 2*SECURE_KEY_SIZE) { - warnx("File '%s' has an invalid size, %lu or %lu bytes " - "expected", keyfile, SECURE_KEY_SIZE, - 2 * SECURE_KEY_SIZE); - return NULL; - } - - fp = fopen(keyfile, "r"); - if (fp == NULL) { - warnx("File '%s': %s", keyfile, strerror(errno)); - return NULL; - } - - buf = util_malloc(size); - count = fread(buf, 1, size, fp); - if (count <= 0) { - msg = feof(fp) ? "File is too small" : strerror(errno); - warnx("File '%s': %s", keyfile, msg); - free(buf); - buf = NULL; - goto out; - } - - *secure_key_size = size; - - if (g.verbose) { - pr_verbose("%lu bytes read from file '%s'", size, keyfile); - util_hexdump_grp(stderr, NULL, buf, 4, size, 0); - } -out: - fclose(fp); - return buf; -} - -/* - * Write a secure key file - */ -static int write_secure_key(const char *keyfile, const u8 *secure_key, - size_t secure_key_size) -{ - size_t count; - FILE *fp; - - fp = fopen(keyfile, "w"); - if (fp == NULL) { - warnx("File '%s': %s", keyfile, strerror(errno)); - return EXIT_FAILURE; - } - - count = fwrite(secure_key, 1, secure_key_size, fp); - if (count <= 0) { - warnx("File '%s': %s", keyfile, strerror(errno)); - fclose(fp); - return EXIT_FAILURE; - } - - if (g.verbose) { - pr_verbose("%lu bytes written to file '%s'", - secure_key_size, keyfile); - util_hexdump_grp(stderr, NULL, secure_key, 4, - secure_key_size, 0); - } - fclose(fp); - return EXIT_SUCCESS; -} - -/* - * Read a clear key file and return the allocated buffer and size - * - * When keybits is 0, then the file size determines the keybits. - */ -static u8 *read_clear_key(const char *keyfile, size_t keybits, - size_t *clear_key_size) -{ - size_t count, size, expected_size; - struct stat sb; - char *msg; - FILE *fp; - u8 *buf; - - if (stat(keyfile, &sb)) { - warnx("File '%s': %s", keyfile, strerror(errno)); - return NULL; - } - size = sb.st_size; - - if (keybits != 0) { - expected_size = DOUBLE_KEYSIZE_FOR_XTS(keybits / 8, g.xts); - if (size != expected_size) { - warnx("File '%s' has an invalid size, " - "%lu bytes expected", keyfile, expected_size); - return NULL; - } - } else { - keybits = DOUBLE_KEYSIZE_FOR_XTS(size * 8, g.xts); - } - - switch (keybits) { - case 128: - break; - case 192: - if (g.xts) { - warnx("File '%s' has an invalid size, " - "192 bit keys are not supported with XTS", - keyfile); - return NULL; - } - break; - case 256: - break; - default: - if (g.xts) - warnx("File '%s' has an invalid size, " - "32 or 64 bytes expected", keyfile); - else - warnx("File '%s' has an invalid size, 16, 24 " - "or 32 bytes expected", keyfile); - return NULL; - } - - fp = fopen(keyfile, "r"); - if (fp == NULL) { - warnx("File '%s': %s", keyfile, strerror(errno)); - return NULL; - } - - buf = util_malloc(size); - count = fread(buf, 1, size ,fp); - if (count <= 0) { - msg = feof(fp) ? "File is too small" : strerror(errno); - warnx("File '%s': %s", keyfile, msg); - free(buf); - buf = NULL; - goto out; - } - - *clear_key_size = size; - - if (g.verbose) { - pr_verbose("%lu bytes read from file '%s'", size, keyfile); - util_hexdump_grp(stderr, NULL, buf, 4, size, 0); - } -out: - fclose(fp); - return buf; -} - /* * Command handler for 'generate with clear key' * @@ -496,76 +274,15 @@ out: */ static int command_generate_clear(const char *keyfile) { - struct pkey_clr2seck clr2sec; - size_t secure_key_size; - size_t clear_key_size; - u8 *secure_key; - u8 *clear_key; int rc; - secure_key_size = DOUBLE_KEYSIZE_FOR_XTS(SECURE_KEY_SIZE, g.xts); - secure_key = util_malloc(secure_key_size); - - clear_key = read_clear_key(g.clearkeyfile, g.keybits, &clear_key_size); - if (clear_key == NULL) - return EXIT_FAILURE; - - clr2sec.cardnr = AUTOSELECT; - clr2sec.domain = AUTOSELECT; - switch (HALF_KEYSIZE_FOR_XTS(clear_key_size * 8, g.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: - warnx("Invalid clear key size: '%lu' bytes", clear_key_size); - rc = EXIT_FAILURE; - goto out; - } - - memcpy(&clr2sec.clrkey, clear_key, - HALF_KEYSIZE_FOR_XTS(clear_key_size, g.xts)); - - rc = ioctl(g.pkey_fd, PKEY_CLR2SECK, &clr2sec); - if (rc < 0) { - warnx("Failed to generate a secure key from a " - "clear key: %s", strerror(errno)); + rc = generate_secure_key_clear(g.pkey_fd, keyfile, + g.keybits, g.xts, + g.clearkeyfile, + AUTOSELECT, AUTOSELECT, + g.verbose); + if (rc != 0) rc = EXIT_FAILURE; - goto out; - } - - memcpy(secure_key, &clr2sec.seckey, SECURE_KEY_SIZE); - - if (g.xts) { - memcpy(&clr2sec.clrkey, clear_key + clear_key_size / 2, - clear_key_size / 2); - - rc = ioctl(g.pkey_fd, PKEY_CLR2SECK, &clr2sec); - if (rc < 0) { - warnx("Failed to generate a secure key from " - "a clear key: %s", strerror(errno)); - rc = EXIT_FAILURE; - goto out; - } - - memcpy(secure_key+SECURE_KEY_SIZE, &clr2sec.seckey, - SECURE_KEY_SIZE); - } - - pr_verbose("Successfully generated a secure key from a clear key"); - - rc = write_secure_key(keyfile, secure_key, secure_key_size); - -out: - memset(&clr2sec, 0, sizeof(clr2sec)); - memset(clear_key, 0, clear_key_size); - free(clear_key); - free(secure_key); return rc; } @@ -576,69 +293,15 @@ out: */ static int command_generate_random(const char *keyfile) { - struct pkey_genseck gensec; - size_t secure_key_size; - u8 *secure_key; int rc; - if (g.keybits == 0) - g.keybits = DEFAULT_KEYBITS; - - secure_key_size = DOUBLE_KEYSIZE_FOR_XTS(SECURE_KEY_SIZE, g.xts); - secure_key = util_malloc(secure_key_size); - - gensec.cardnr = AUTOSELECT; - gensec.domain = AUTOSELECT; - switch (g.keybits) { - case 128: - gensec.keytype = PKEY_KEYTYPE_AES_128; - break; - case 192: - if (g.xts) { - warnx("Invalid value for '--keybits'|'-c' " - "for XTS: '%lu'", g.keybits); - rc = EXIT_FAILURE; - goto out; - } - gensec.keytype = PKEY_KEYTYPE_AES_192; - break; - case 256: - gensec.keytype = PKEY_KEYTYPE_AES_256; - break; - default: - warnx("Invalid value for '--keybits'/'-c': '%lu'", g.keybits); + rc = generate_secure_key_random(g.pkey_fd, keyfile, + g.keybits, g.xts, + AUTOSELECT, AUTOSELECT, + g.verbose); + if (rc != 0) rc = EXIT_FAILURE; - goto out; - } - - rc = ioctl(g.pkey_fd, PKEY_GENSECK, &gensec); - if (rc < 0) { - warnx("Failed to generate a secure key: %s", strerror(errno)); - rc = EXIT_FAILURE; - goto out; - } - - memcpy(secure_key, &gensec.seckey, SECURE_KEY_SIZE); - - if (g.xts) { - rc = ioctl(g.pkey_fd, PKEY_GENSECK, &gensec); - if (rc < 0) { - warnx("Failed to generate a secure key: %s", - strerror(errno)); - rc = EXIT_FAILURE; - goto out; - } - - memcpy(secure_key + SECURE_KEY_SIZE, &gensec.seckey, - SECURE_KEY_SIZE); - } - - pr_verbose("Successfully generated a secure key"); - rc = write_secure_key(keyfile, secure_key, secure_key_size); - -out: - free(secure_key); return rc; } @@ -653,182 +316,6 @@ static int command_generate(const char * : command_generate_random(keyfile); } -static void print_CCA_error(int return_code, int reason_code) -{ - switch (return_code) { - case 8: - switch (reason_code) { - case 48: - warnx("The secure key has a CCA master key " - "verification pattern that is not valid"); - break; - } - break; - case 12: - switch (reason_code) { - case 764: - warnx("The CCA master key is not loaded and " - "therefore a secure key cannot be enciphered"); - break; - } - break; - } -} - -static int key_token_change(u8 *secure_key, unsigned int secure_key_size, - char *method) -{ - long exit_data_len = 0, rule_array_count; - unsigned char rule_array[2 * 80] = { 0, }; - unsigned char exit_data[4] = { 0, }; - long return_code, reason_code; - - memcpy(rule_array, method, 8); - memcpy(rule_array + 8, "AES ", 8); - rule_array_count = 2; - - g.dll_CSNBKTC(&return_code, &reason_code, - &exit_data_len, exit_data, - &rule_array_count, rule_array, - secure_key); - - pr_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 EXIT_FAILURE; - } - - if (secure_key_size == 2 * SECURE_KEY_SIZE) { - g.dll_CSNBKTC(&return_code, &reason_code, - &exit_data_len, exit_data, - &rule_array_count, rule_array, - secure_key + SECURE_KEY_SIZE); - - pr_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 EXIT_FAILURE; - } - } - return EXIT_SUCCESS; -} - -static int validate_secure_xts_key(u8 *secure_key, size_t secure_key_size, - u16 part1_keysize, u32 part1_attributes, - size_t *clear_key_bitsize) -{ - struct secaeskeytoken *token = (struct secaeskeytoken *)secure_key; - struct pkey_verifykey verifykey; - struct secaeskeytoken *token2; - int rc; - - /* XTS uses 2 secure key tokens concatenated to each other */ - token2 = (struct secaeskeytoken *)(secure_key + SECURE_KEY_SIZE); - - if (secure_key_size != 2 * SECURE_KEY_SIZE) { - pr_verbose("Size of secure key is too small: %lu expected %lu", - secure_key_size, 2 * SECURE_KEY_SIZE); - return EXIT_FAILURE; - } - - if (token->bitsize != token2->bitsize) { - pr_verbose("XTS secure key contains 2 clear keys of " - "different sizes"); - return EXIT_FAILURE; - } - if (token->keysize != token2->keysize) { - pr_verbose("XTS secure key contains 2 keys of different " - "sizes"); - return EXIT_FAILURE; - } - if (memcmp(&token->mkvp, &token2->mkvp, sizeof(token->mkvp)) != 0) { - pr_verbose("XTS secure key contains 2 keys using different " - "CCA master keys"); - return EXIT_FAILURE; - } - - memcpy(&verifykey.seckey, token2, sizeof(verifykey.seckey)); - - rc = ioctl(g.pkey_fd, PKEY_VERIFYKEY, &verifykey); - if (rc < 0) { - warnx("Failed to validate a secure key: %s", strerror(errno)); - return EXIT_FAILURE; - } - - if ((verifykey.attributes & PKEY_VERIFY_ATTR_AES) == 0) { - pr_verbose("Secure key is not an AES key"); - return EXIT_FAILURE; - } - - if (verifykey.keysize != part1_keysize) { - pr_verbose("XTS secure key contains 2 keys using different " - "key sizes"); - return EXIT_FAILURE; - } - - if (verifykey.attributes != part1_attributes) { - pr_verbose("XTS secure key contains 2 keys using different " - "attributes"); - return EXIT_FAILURE; - } - - if (clear_key_bitsize) - *clear_key_bitsize += verifykey.keysize; - - return EXIT_SUCCESS; -} - -static int validate_secure_key(u8 *secure_key, size_t secure_key_size, - size_t *clear_key_bitsize, int *is_old_mk) -{ - struct secaeskeytoken *token = (struct secaeskeytoken *)secure_key; - struct pkey_verifykey verifykey; - int rc; - - if (secure_key_size < SECURE_KEY_SIZE) { - pr_verbose("Size of secure key is too small: %lu expected %lu", - secure_key_size, SECURE_KEY_SIZE); - return EXIT_FAILURE; - } - - memcpy(&verifykey.seckey, token, sizeof(verifykey.seckey)); - - rc = ioctl(g.pkey_fd, PKEY_VERIFYKEY, &verifykey); - if (rc < 0) { - warnx("Failed to validate a secure key: %s", strerror(errno)); - return EXIT_FAILURE; - } - - if ((verifykey.attributes & PKEY_VERIFY_ATTR_AES) == 0) { - pr_verbose("Secure key is not an AES key"); - return EXIT_FAILURE; - } - - if (clear_key_bitsize) - *clear_key_bitsize = verifykey.keysize; - - /* XTS uses 2 secure key tokens concatenated to each other */ - if (secure_key_size > SECURE_KEY_SIZE) { - rc = validate_secure_xts_key(secure_key, secure_key_size, - verifykey.keysize, - verifykey.attributes, - clear_key_bitsize); - if (rc != EXIT_SUCCESS) - return rc; - } - - if (is_old_mk) - *is_old_mk = (verifykey.attributes & - PKEY_VERIFY_ATTR_OLD_MKVP) != 0; - - pr_verbose("Secure key validation completed successfully"); - - return EXIT_SUCCESS; -} /* * Command handler for 'reencipher'. @@ -842,14 +329,15 @@ static int command_reencipher(const char u8 *secure_key; /* Read the secure key to be re-enciphered */ - secure_key = read_secure_key(keyfile, &secure_key_size); + secure_key = read_secure_key(keyfile, &secure_key_size, g.verbose); if (secure_key == NULL) return EXIT_FAILURE; - rc = validate_secure_key(secure_key, secure_key_size, NULL, - &is_old_mk); - if (rc != EXIT_SUCCESS) { + rc = validate_secure_key(g.pkey_fd, secure_key, secure_key_size, NULL, + &is_old_mk, g.verbose); + if (rc != 0) { warnx("The secure key in file '%s' is not valid", keyfile); + rc = EXIT_FAILURE; goto out; } @@ -884,10 +372,14 @@ static int command_reencipher(const char pr_verbose("Secure key will be re-enciphered from OLD to the " "CURRENT CCA master key"); - rc = key_token_change(secure_key, secure_key_size, "RTCMK "); - if (rc != EXIT_SUCCESS) { + rc = key_token_change(g.dll_CSNBKTC, + secure_key, secure_key_size, + METHOD_OLD_TO_CURRENT, + g.verbose); + if (rc != 0) { warnx("Re-encipher from OLD to CURRENT CCA " "master key has failed"); + rc = EXIT_FAILURE; goto out; } } @@ -895,10 +387,13 @@ static int command_reencipher(const char pr_verbose("Secure key will be re-enciphered from CURRENT " "to the NEW CCA master key"); - rc = key_token_change(secure_key, secure_key_size, "RTNMK "); - if (rc != EXIT_SUCCESS) { + rc = key_token_change(g.dll_CSNBKTC, + secure_key, secure_key_size, + METHOD_CURRENT_TO_NEW, g.verbose); + if (rc != 0) { warnx("Re-encipher from CURRENT to NEW CCA " "master key has failed"); + rc = EXIT_FAILURE; goto out; } } @@ -907,7 +402,9 @@ static int command_reencipher(const char /* Write the migrated secure key */ rc = write_secure_key(g.outputfile ? g.outputfile : keyfile, - secure_key, secure_key_size); + secure_key, secure_key_size, g.verbose); + if (rc != 0) + rc = EXIT_FAILURE; out: free(secure_key); return rc; @@ -927,14 +424,15 @@ static int command_validate(const char * int rc; /* Read the secure key to be re-enciphered */ - secure_key = read_secure_key(keyfile, &secure_key_size); + secure_key = read_secure_key(keyfile, &secure_key_size, g.verbose); if (secure_key == NULL) return EXIT_FAILURE; - rc = validate_secure_key(secure_key, secure_key_size, &clear_key_size, - &is_old_mk); - if (rc != EXIT_SUCCESS) { + rc = validate_secure_key(g.pkey_fd, secure_key, secure_key_size, + &clear_key_size, &is_old_mk, g.verbose); + if (rc != 0) { warnx("The secure key in file '%s' is not valid", keyfile); + rc = EXIT_FAILURE; goto out; } @@ -1083,13 +581,14 @@ int main(int argc, char *argv[]) } if (command->need_cca_library) { - rc = load_cca_library(); - if (rc != EXIT_SUCCESS) + rc = load_cca_library(&g.lib_csulcca, &g.dll_CSNBKTC, + g.verbose); + if (rc != 0) goto out; } if (command->need_pkey_device) { - rc = open_pkey_device(); - if (rc != EXIT_SUCCESS) + g.pkey_fd = open_pkey_device(g.verbose); + if (g.pkey_fd == -1) goto out; }
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