In order to prevent using the global errno, replace it with a static version and create a wrapper function which returns the error value.
Signed-off-by: Steffen Jaeckel jaeckel-floss@eyet-services.de ---
include/crypt.h | 3 ++- lib/crypt/alg-sha256.h | 6 ------ lib/crypt/alg-sha512.h | 6 ------ lib/crypt/crypt-port.h | 18 ++++++++++-------- lib/crypt/crypt-sha256.c | 25 +++++++++++++++++++++++-- lib/crypt/crypt-sha512.c | 25 +++++++++++++++++++++++-- lib/crypt/crypt.c | 25 ++++++++++++++----------- test/lib/test_crypt.c | 24 ++++++++++++++++++++++-- 8 files changed, 94 insertions(+), 38 deletions(-)
diff --git a/include/crypt.h b/include/crypt.h index e0be2832ff..f18a1705d4 100644 --- a/include/crypt.h +++ b/include/crypt.h @@ -9,5 +9,6 @@ * @equal Pointer to an int where the result is stored * '0' = unequal * '1' = equal + * @return 0 on success, error code of errno else */ -void crypt_compare(const char *should, const char *passphrase, int *equal); +int crypt_compare(const char *should, const char *passphrase, int *equal); diff --git a/lib/crypt/alg-sha256.h b/lib/crypt/alg-sha256.h index e4b29c9f31..62e7b9d5c0 100644 --- a/lib/crypt/alg-sha256.h +++ b/lib/crypt/alg-sha256.h @@ -1,12 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0+ */ /* Copyright (C) 2020 Steffen Jaeckel jaeckel-floss@eyet-services.de */
-#ifndef USE_HOSTCC -#include "common.h" -#else -#include <string.h> -#endif - #include "u-boot/sha256.h"
#define INCLUDE_sha256crypt 1 diff --git a/lib/crypt/alg-sha512.h b/lib/crypt/alg-sha512.h index 93b6109fae..47e45730cc 100644 --- a/lib/crypt/alg-sha512.h +++ b/lib/crypt/alg-sha512.h @@ -1,12 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0+ */ /* Copyright (C) 2020 Steffen Jaeckel jaeckel-floss@eyet-services.de */
-#ifndef USE_HOSTCC -#include "common.h" -#else -#include <string.h> -#endif - #include "u-boot/sha512.h"
#define INCLUDE_sha512crypt 1 diff --git a/lib/crypt/crypt-port.h b/lib/crypt/crypt-port.h index 680ffe9349..6b9542d75b 100644 --- a/lib/crypt/crypt-port.h +++ b/lib/crypt/crypt-port.h @@ -18,11 +18,13 @@ extern const unsigned char ascii64[65];
#define b64t ((const char *)ascii64)
-void crypt_sha256crypt_rn(const char *phrase, size_t phr_size, - const char *setting, size_t ARG_UNUSED(set_size), - uint8_t *output, size_t out_size, void *scratch, - size_t scr_size); -void crypt_sha512crypt_rn(const char *phrase, size_t phr_size, - const char *setting, size_t ARG_UNUSED(set_size), - uint8_t *output, size_t out_size, void *scratch, - size_t scr_size); +int crypt_sha256crypt_rn_wrapped(const char *phrase, size_t phr_size, + const char *setting, + size_t ARG_UNUSED(set_size), uint8_t *output, + size_t out_size, void *scratch, + size_t scr_size); +int crypt_sha512crypt_rn_wrapped(const char *phrase, size_t phr_size, + const char *setting, + size_t ARG_UNUSED(set_size), uint8_t *output, + size_t out_size, void *scratch, + size_t scr_size); diff --git a/lib/crypt/crypt-sha256.c b/lib/crypt/crypt-sha256.c index 37127d41e1..6160436a37 100644 --- a/lib/crypt/crypt-sha256.c +++ b/lib/crypt/crypt-sha256.c @@ -4,7 +4,9 @@ * Modified by Zack Weinberg <zackw at panix.com> in 2017, 2018. * Composed by Björn Esser <besser82 at fedoraproject.org> in 2018. * Modified by Björn Esser <besser82 at fedoraproject.org> in 2020. - * Modified by Steffen Jaeckel <jaeckel-floss at eyet-services.de> in 2020. + * Modified by Steffen Jaeckel <jaeckel-floss at eyet-services.de> in 2021 + * for U-Boot, instead of using the global errno to use a static one + * inside this file. * To the extent possible under law, the named authors have waived all * copyright and related or neighboring rights to this work. * @@ -20,7 +22,7 @@ #include "crypt-port.h" #include "alg-sha256.h"
-#include <errno.h> +#include <linux/errno.h> #include <stdio.h> #include <stdlib.h>
@@ -69,6 +71,25 @@ static_assert (sizeof (struct sha256_buffer) <= ALG_SPECIFIC_SIZE, "ALG_SPECIFIC_SIZE is too small for SHA256");
+/* Use this instead of including errno.h */ +static int errno; + +void crypt_sha256crypt_rn(const char *phrase, size_t phr_size, + const char *setting, size_t ARG_UNUSED(set_size), + uint8_t *output, size_t out_size, void *scratch, + size_t scr_size); + +int crypt_sha256crypt_rn_wrapped(const char *phrase, size_t phr_size, + const char *setting, size_t set_size, + u8 *output, size_t out_size, void *scratch, + size_t scr_size) +{ + errno = 0; + crypt_sha256crypt_rn(phrase, phr_size, setting, set_size, output, + out_size, scratch, scr_size); + return -errno; +} + /* Feed CTX with LEN bytes of a virtual byte sequence consisting of BLOCK repeated over and over indefinitely. */ static void diff --git a/lib/crypt/crypt-sha512.c b/lib/crypt/crypt-sha512.c index 3616019445..b019b43366 100644 --- a/lib/crypt/crypt-sha512.c +++ b/lib/crypt/crypt-sha512.c @@ -4,7 +4,9 @@ * Modified by Zack Weinberg <zackw at panix.com> in 2017, 2018. * Composed by Björn Esser <besser82 at fedoraproject.org> in 2018. * Modified by Björn Esser <besser82 at fedoraproject.org> in 2020. - * Modified by Steffen Jaeckel <jaeckel-floss at eyet-services.de> in 2020. + * Modified by Steffen Jaeckel <jaeckel-floss at eyet-services.de> in 2021 + * for U-Boot, instead of using the global errno to use a static one + * inside this file. * To the extent possible under law, the named authors have waived all * copyright and related or neighboring rights to this work. * @@ -20,7 +22,7 @@ #include "crypt-port.h" #include "alg-sha512.h"
-#include <errno.h> +#include <linux/errno.h> #include <stdio.h> #include <stdlib.h>
@@ -69,6 +71,25 @@ static_assert (sizeof (struct sha512_buffer) <= ALG_SPECIFIC_SIZE, "ALG_SPECIFIC_SIZE is too small for SHA512");
+/* Use this instead of including errno.h */ +static int errno; + +void crypt_sha512crypt_rn(const char *phrase, size_t phr_size, + const char *setting, size_t ARG_UNUSED(set_size), + uint8_t *output, size_t out_size, void *scratch, + size_t scr_size); + +int crypt_sha512crypt_rn_wrapped(const char *phrase, size_t phr_size, + const char *setting, size_t set_size, + u8 *output, size_t out_size, void *scratch, + size_t scr_size) +{ + errno = 0; + crypt_sha512crypt_rn(phrase, phr_size, setting, set_size, output, + out_size, scratch, scr_size); + return -errno; +} + /* Subroutine of _xcrypt_crypt_sha512crypt_rn: Feed CTX with LEN bytes of a virtual byte sequence consisting of BLOCK repeated over and over indefinitely. */ diff --git a/lib/crypt/crypt.c b/lib/crypt/crypt.c index 4ec6079768..bbd8fe2409 100644 --- a/lib/crypt/crypt.c +++ b/lib/crypt/crypt.c @@ -5,8 +5,8 @@ #include <crypt.h> #include "crypt-port.h"
-typedef void (*crypt_fn)(const char *, size_t, const char *, size_t, uint8_t *, - size_t, void *, size_t); +typedef int (*crypt_fn)(const char *, size_t, const char *, size_t, uint8_t *, + size_t, void *, size_t);
const unsigned char ascii64[65] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; @@ -29,19 +29,20 @@ static void equals_constant_time(const void *a_, const void *b_, size_t len, *equal = ret ^ 1; }
-void crypt_compare(const char *should, const char *passphrase, int *equal) +int crypt_compare(const char *should, const char *passphrase, int *equal) { u8 output[CRYPT_OUTPUT_SIZE], scratch[ALG_SPECIFIC_SIZE]; size_t n; + int err; struct { const char *prefix; crypt_fn crypt; } crypt_algos[] = { #if defined(CONFIG_CRYPT_PW_SHA256) - { "$5$", crypt_sha256crypt_rn }, + { "$5$", crypt_sha256crypt_rn_wrapped }, #endif #if defined(CONFIG_CRYPT_PW_SHA512) - { "$6$", crypt_sha512crypt_rn }, + { "$6$", crypt_sha512crypt_rn_wrapped }, #endif { NULL, NULL } }; @@ -56,18 +57,20 @@ void crypt_compare(const char *should, const char *passphrase, int *equal) }
if (n >= ARRAY_SIZE(crypt_algos)) - return; - - crypt_algos[n].crypt(passphrase, strlen(passphrase), should, 0, output, - sizeof(output), scratch, sizeof(scratch)); + return EINVAL;
+ err = crypt_algos[n].crypt(passphrase, strlen(passphrase), should, 0, + output, sizeof(output), scratch, + sizeof(scratch)); /* early return on error, nothing really happened inside the crypt() function */ - if (errno == ERANGE || errno == EINVAL) - return; + if (err) + return err;
equals_constant_time(should, output, strlen((const char *)output), equal);
memset(scratch, 0, sizeof(scratch)); memset(output, 0, sizeof(output)); + + return 0; } diff --git a/test/lib/test_crypt.c b/test/lib/test_crypt.c index 277e4efed1..fb21edf974 100644 --- a/test/lib/test_crypt.c +++ b/test/lib/test_crypt.c @@ -21,19 +21,39 @@ static int lib_crypt(struct unit_test_state *uts) { int equals = 0; + int err; + + err = crypt_compare("", "password", &equals); + ut_assertf(err != 0, "crypt_compare successful but should not\n"); + ut_assertf(equals != 1, + "crypt_compare password hash matched but should not\n");
if (IS_ENABLED(CONFIG_CRYPT_PW_SHA256)) { - crypt_compare( + err = crypt_compare("$5$", "password", &equals); + ut_assertf(err == 0, "crypt-sha256 not successful\n"); + ut_assertf( + equals != 1, + "crypt-sha256 password hash matched but should not\n"); + + err = crypt_compare( "$5$rounds=640000$TM4lL4zXDG7F4aRX$JM7a9wmvodnA0WasjTztj6mxg.KVuk6doQ/eBhdcapB", "password", &equals); + ut_assertf(err == 0, "crypt-sha256 failed: %d\n", err); ut_assertf(equals == 1, "crypt-sha256 password hash didn't match\n"); } equals = 0; if (IS_ENABLED(CONFIG_CRYPT_PW_SHA512)) { - crypt_compare( + err = crypt_compare("$6$", "password", &equals); + ut_assertf(err == 0, "crypt-sha512 not successful\n"); + ut_assertf( + equals != 1, + "crypt-sha512 password hash matched but should not\n"); + + err = crypt_compare( "$6$rounds=640000$fCTP1F0N5JLq2eND$z5EzK5KZJA9JnOaj5d1Gg/2v6VqFOQJ3bVekWuCPauabutBt/8qzV1exJnytUyhbq3H0bSBXtodwNbtGEi/Tm/", "password", &equals); + ut_assertf(err == 0, "crypt-sha512 failed: %d\n", err); ut_assertf(equals == 1, "crypt-sha512 password hash didn't match\n"); }