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Fix CVE-2023-5992: Side-chanel leak in PKCS1.5 depadding

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Resolves: RHEL-17087
This commit is contained in:
Veronika Hanulíková 2024-02-08 13:59:28 +01:00
parent 0766703007
commit f37482533d
1 changed files with 234 additions and 166 deletions
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308
opensc-0.23.0-constant-time-pkcs1.patch
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@ -24,10 +24,10 @@ index 5153428dc..9ecbffe8f 100644
if [ -x "$(CLANGTIDY)" ]; then clang-tidy -config='' -header-filter=.* $(TIDY_FILES) -- $(TIDY_FLAGS); fi if [ -x "$(CLANGTIDY)" ]; then clang-tidy -config='' -header-filter=.* $(TIDY_FILES) -- $(TIDY_FLAGS); fi
diff --git a/src/common/constant-time.h b/src/common/constant-time.h diff --git a/src/common/constant-time.h b/src/common/constant-time.h
new file mode 100644 new file mode 100644
index 000000000..f70251f5d index 0000000000..40c3e500c2
--- /dev/null --- /dev/null
+++ b/src/common/constant-time.h +++ b/src/common/constant-time.h
@@ -0,0 +1,108 @@ @@ -0,0 +1,134 @@
+/* Original source: https://github.com/openssl/openssl/blob/9890cc42daff5e2d0cad01ac4bf78c391f599a6e/include/internal/constant_time.h */ +/* Original source: https://github.com/openssl/openssl/blob/9890cc42daff5e2d0cad01ac4bf78c391f599a6e/include/internal/constant_time.h */
+ +
+#ifndef CONSTANT_TIME_H +#ifndef CONSTANT_TIME_H
@ -40,7 +40,7 @@ index 000000000..f70251f5d
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L +#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+#define constant_inline inline +#define constant_inline inline
+#elif defined(__GNUC__) && __GNUC__ >= 2 +#elif defined(__GNUC__) && __GNUC__ >= 2
+# define constant_inline __inline__ +#elif defined(__GNUC__) && __GNUC__ >= 2
+#elif defined(_MSC_VER) +#elif defined(_MSC_VER)
+#define constant_inline __inline +#define constant_inline __inline
+#else +#else
@ -50,20 +50,36 @@ index 000000000..f70251f5d
+#define constant_inline inline /* inline */ +#define constant_inline inline /* inline */
+#endif +#endif
+ +
+static constant_inline unsigned int value_barrier(unsigned int a) +/*-
+ * The boolean methods return a bitmask of all ones (0xff...f) for true
+ * and 0 for false. For example,
+ * if (a < b) {
+ * c = a;
+ * } else {
+ * c = b;
+ * }
+ * can be written as
+ * unsigned int lt = constant_time_lt(a, b);
+ * c = constant_time_select(lt, a, b);
+ */
+
+static constant_inline unsigned int
+value_barrier(unsigned int a)
+{ +{
+ volatile unsigned int r = a; + volatile unsigned int r = a;
+ return r; + return r;
+} +}
+ +
+static constant_inline size_t value_barrier_s(size_t a) +static constant_inline size_t
+value_barrier_s(size_t a)
+{ +{
+ volatile size_t r = a; + volatile size_t r = a;
+ return r; + return r;
+} +}
+ +
+/* MSB */ +/* MSB */
+static constant_inline size_t constant_time_msb_s(size_t a) +static constant_inline size_t
+constant_time_msb_s(size_t a)
+{ +{
+ return 0 - (a >> (sizeof(a) * 8 - 1)); + return 0 - (a >> (sizeof(a) * 8 - 1));
+} +}
@ -87,7 +103,8 @@ index 000000000..f70251f5d
+ return (unsigned char)constant_time_select(mask, a, b); + return (unsigned char)constant_time_select(mask, a, b);
+} +}
+ +
+static constant_inline size_t constant_time_select_s(size_t mask, size_t a, size_t b) +static constant_inline size_t
+constant_time_select_s(size_t mask, size_t a, size_t b)
+{ +{
+ return (value_barrier_s(mask) & a) | (value_barrier_s(~mask) & b); + return (value_barrier_s(mask) & a) | (value_barrier_s(~mask) & b);
+} +}
@ -99,13 +116,15 @@ index 000000000..f70251f5d
+ return constant_time_msb(~a & (a - 1)); + return constant_time_msb(~a & (a - 1));
+} +}
+ +
+static constant_inline size_t constant_time_is_zero_s(size_t a) +static constant_inline size_t
+constant_time_is_zero_s(size_t a)
+{ +{
+ return constant_time_msb_s(~a & (a - 1)); + return constant_time_msb_s(~a & (a - 1));
+} +}
+ +
+/* Comparison*/ +/* Comparison*/
+static constant_inline size_t constant_time_lt_s(size_t a, size_t b) +static constant_inline size_t
+constant_time_lt_s(size_t a, size_t b)
+{ +{
+ return constant_time_msb_s(a ^ ((a ^ b) | ((a - b) ^ b))); + return constant_time_msb_s(a ^ ((a ^ b) | ((a - b) ^ b)));
+} +}
@ -130,11 +149,18 @@ index 000000000..f70251f5d
+ return constant_time_is_zero(a ^ b); + return constant_time_is_zero(a ^ b);
+} +}
+ +
+static constant_inline size_t constant_time_eq_s(size_t a, size_t b) +static constant_inline size_t
+constant_time_eq_s(size_t a, size_t b)
+{ +{
+ return constant_time_is_zero_s(a ^ b); + return constant_time_is_zero_s(a ^ b);
+} +}
+ +
+static constant_inline unsigned int
+constant_time_eq_i(int a, int b)
+{
+ return constant_time_eq((unsigned int)a, (unsigned int)b);
+}
+
+#endif /* CONSTANT_TIME_H */ +#endif /* CONSTANT_TIME_H */
diff --git a/src/libopensc/internal.h b/src/libopensc/internal.h diff --git a/src/libopensc/internal.h b/src/libopensc/internal.h
index 74014235a..13eccfa1a 100644 index 74014235a..13eccfa1a 100644
@ -150,14 +176,15 @@ index 74014235a..13eccfa1a 100644
const u8 *in_dat, size_t in_len, u8 *out_dat, size_t *out_len); const u8 *in_dat, size_t in_len, u8 *out_dat, size_t *out_len);
diff --git a/src/libopensc/padding.c b/src/libopensc/padding.c diff --git a/src/libopensc/padding.c b/src/libopensc/padding.c
index 283746699..ceb2a1e21 100644 index ca47733a4e..ddb3061134 100644
--- a/src/libopensc/padding.c --- a/src/libopensc/padding.c
+++ b/src/libopensc/padding.c +++ b/src/libopensc/padding.c
@@ -33,9 +33,12 @@ @@ -32,10 +32,13 @@
#include <string.h>
#include <stdlib.h> #include <stdlib.h>
#include "internal.h"
+#include "common/constant-time.h" +#include "common/constant-time.h"
#include "internal.h"
/* TODO doxygen comments */ /* TODO doxygen comments */
@ -166,24 +193,36 @@ index 283746699..ceb2a1e21 100644
/* /*
* Prefixes for pkcs-v1 signatures * Prefixes for pkcs-v1 signatures
*/ */
@@ -184,6 +187,84 @@ sc_pkcs1_strip_02_padding(sc_context_t *ctx, const u8 *data, size_t len, u8 *out @@ -144,44 +147,82 @@ sc_pkcs1_strip_01_padding(struct sc_cont
LOG_FUNC_RETURN(ctx, len - n);
} }
+/* Original source: https://github.com/openssl/openssl/blob/9890cc42daff5e2d0cad01ac4bf78c391f599a6e/crypto/rsa/rsa_pk1.c#L171 */
+int -/* remove pkcs1 BT02 padding (adding BT02 padding is currently not
- * needed/implemented) */
+/* Remove pkcs1 BT02 padding (adding BT02 padding is currently not
+ * needed/implemented) in constant-time.
+ * Original source: https://github.com/openssl/openssl/blob/9890cc42daff5e2d0cad01ac4bf78c391f599a6e/crypto/rsa/rsa_pk1.c#L171 */
int
-sc_pkcs1_strip_02_padding(sc_context_t *ctx, const u8 *data, size_t len, u8 *out, size_t *out_len)
+sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const u8 *data, unsigned int data_len, u8 *out, unsigned int *out_len) +sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const u8 *data, unsigned int data_len, u8 *out, unsigned int *out_len)
+{ {
- unsigned int n = 0;
-
+ unsigned int i = 0; + unsigned int i = 0;
+ u8 *msg = NULL; + u8 *msg, *msg_orig = NULL;
+ unsigned int good, found_zero_byte, mask; + unsigned int good, found_zero_byte, mask;
+ unsigned int zero_index = 0, msg_index, mlen = -1, len = 0; + unsigned int zero_index = 0, msg_index, mlen = -1, len = 0;
+ LOG_FUNC_CALLED(ctx); LOG_FUNC_CALLED(ctx);
- if (data == NULL || len < 3)
+ +
+ if (data == NULL || data_len <= 0 || data_len > n || n < SC_PKCS1_PADDING_MIN_SIZE) + if (data == NULL || data_len <= 0 || data_len > n || n < SC_PKCS1_PADDING_MIN_SIZE)
+ LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL); LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
+
+ msg = calloc(n, sizeof(u8)); - /* skip leading zero byte */
- if (*data == 0) {
- data++;
- len--;
+ msg = msg_orig = calloc(n, sizeof(u8));
+ if (msg == NULL) + if (msg == NULL)
+ LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL); + LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
+ +
@ -211,8 +250,25 @@ index 283746699..ceb2a1e21 100644
+ unsigned int equals0 = constant_time_is_zero(msg[i]); + unsigned int equals0 = constant_time_is_zero(msg[i]);
+ zero_index = constant_time_select(~found_zero_byte & equals0, i, zero_index); + zero_index = constant_time_select(~found_zero_byte & equals0, i, zero_index);
+ found_zero_byte |= equals0; + found_zero_byte |= equals0;
+ } }
+ - if (data[0] != 0x02)
- LOG_FUNC_RETURN(ctx, SC_ERROR_WRONG_PADDING);
- /* skip over padding bytes */
- for (n = 1; n < len && data[n]; n++)
- ;
- /* Must be at least 8 pad bytes */
- if (n >= len || n < 9)
- LOG_FUNC_RETURN(ctx, SC_ERROR_WRONG_PADDING);
- n++;
- if (out == NULL)
- /* just check the padding */
- LOG_FUNC_RETURN(ctx, SC_SUCCESS);
- /* Now move decrypted contents to head of buffer */
- if (*out_len < len - n)
- LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
- *out_len = len - n;
- memmove(out, data + n, *out_len);
+ // zero_index stands for index of last found zero + // zero_index stands for index of last found zero
+ good &= constant_time_ge(zero_index, 2 + 8); + good &= constant_time_ge(zero_index, 2 + 8);
+ +
@ -222,8 +278,6 @@ index 283746699..ceb2a1e21 100644
+ // length of message + // length of message
+ mlen = data_len - msg_index; + mlen = data_len - msg_index;
+ +
+ // check that there is a message after padding
+ good &= constant_time_ge(mlen, 1);
+ // check that message fits into out buffer + // check that message fits into out buffer
+ good &= constant_time_ge(*out_len, mlen); + good &= constant_time_ge(*out_len, mlen);
+ +
@ -243,19 +297,21 @@ index 283746699..ceb2a1e21 100644
+ msg_index = constant_time_select(mask, i + SC_PKCS1_PADDING_MIN_SIZE, 0); // to now overflow msg buffer + msg_index = constant_time_select(mask, i + SC_PKCS1_PADDING_MIN_SIZE, 0); // to now overflow msg buffer
+ out[i] = constant_time_select_8(mask, msg[msg_index], out[i]); + out[i] = constant_time_select_8(mask, msg[msg_index], out[i]);
+ } + }
+
+ free(msg); - sc_log(ctx, "stripped output(%"SC_FORMAT_LEN_SIZE_T"u): %s", len - n,
- sc_dump_hex(out, len - n));
- LOG_FUNC_RETURN(ctx, len - n);
+ free(msg_orig);
+ return constant_time_select(good, mlen, SC_ERROR_WRONG_PADDING); + return constant_time_select(good, mlen, SC_ERROR_WRONG_PADDING);
+} }
+
/* add/remove DigestInfo prefix */ /* add/remove DigestInfo prefix */
static int sc_pkcs1_add_digest_info_prefix(unsigned int algorithm,
const u8 *in, size_t in_len, u8 *out, size_t *out_len)
diff --git a/src/libopensc/pkcs15-sec.c b/src/libopensc/pkcs15-sec.c diff --git a/src/libopensc/pkcs15-sec.c b/src/libopensc/pkcs15-sec.c
index 7c3a39432..b5e492fe2 100644 index a019af460f..f7ee819d65 100644
--- a/src/libopensc/pkcs15-sec.c --- a/src/libopensc/pkcs15-sec.c
+++ b/src/libopensc/pkcs15-sec.c +++ b/src/libopensc/pkcs15-sec.c
@@ -308,12 +308,13 @@ int sc_pkcs15_decipher(struct sc_pkcs15_card *p15card, @@ -286,12 +286,14 @@ int sc_pkcs15_decipher(struct sc_pkcs15_
/* Strip any padding */ /* Strip any padding */
if (pad_flags & SC_ALGORITHM_RSA_PAD_PKCS1) { if (pad_flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
@ -263,34 +319,47 @@ index 7c3a39432..b5e492fe2 100644
- r = sc_pkcs1_strip_02_padding(ctx, out, s, out, &s); - r = sc_pkcs1_strip_02_padding(ctx, out, s, out, &s);
- LOG_TEST_RET(ctx, r, "Invalid PKCS#1 padding"); - LOG_TEST_RET(ctx, r, "Invalid PKCS#1 padding");
+ unsigned int s = r; + unsigned int s = r;
+ unsigned int key_size = alg_info->key_length; + unsigned int key_size = (unsigned int)alg_info->key_length;
+ r = sc_pkcs1_strip_02_padding_constant_time(ctx, key_size / 8, out, s, out, &s); + r = sc_pkcs1_strip_02_padding_constant_time(ctx, key_size / 8, out, s, out, &s);
+ /* for keeping PKCS#1 v1.5 depadding constant-time, do not log error here */ + /* for keeping PKCS#1 v1.5 depadding constant-time, do not log error here */
} }
- LOG_FUNC_RETURN(ctx, r); - LOG_FUNC_RETURN(ctx, r);
+ /* do not log error code to prevent side channel attack */
+ return r; + return r;
} }
/* derive one key from another. RSA can use decipher, so this is for only ECDH /* derive one key from another. RSA can use decipher, so this is for only ECDH
diff --git a/src/pkcs11/framework-pkcs15.c b/src/pkcs11/framework-pkcs15.c diff --git a/src/pkcs11/framework-pkcs15.c b/src/pkcs11/framework-pkcs15.c
index 809cd72d9..9c75759a0 100644 index f75a3dbaec..632681df63 100644
--- a/src/pkcs11/framework-pkcs15.c --- a/src/pkcs11/framework-pkcs15.c
+++ b/src/pkcs11/framework-pkcs15.c +++ b/src/pkcs11/framework-pkcs15.c
@@ -28,6 +28,7 @@ @@ -18,6 +18,7 @@
#include "libopensc/cardctl.h" * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "ui/notify.h" */
#include "common/compat_strnlen.h"
+#include "common/constant-time.h" +#include "common/constant-time.h"
#ifdef ENABLE_OPENSSL #include "config.h"
#include <openssl/sha.h> #include <stdlib.h>
#else #include <string.h>
@@ -4603,15 +4604,51 @@ pkcs15_prkey_decrypt(struct sc_pkcs11_session *session, void *obj, @@ -4174,7 +4175,8 @@ pkcs15_prkey_decrypt(struct sc_pkcs11_se
struct pkcs15_fw_data *fw_data = NULL;
struct pkcs15_prkey_object *prkey;
unsigned char decrypted[512]; /* FIXME: Will not work for keys above 4096 bits */
- int buff_too_small, rv, flags = 0, prkey_has_path = 0;
+ int rv, flags = 0, prkey_has_path = 0;
+ CK_ULONG mask, good, rv_pkcs11;
sc_log(context, "Initiating decryption.");
@@ -4246,27 +4248,54 @@ pkcs15_prkey_decrypt(struct sc_pkcs11_se
rv = sc_pkcs15_decipher(fw_data->p15_card, prkey->prv_p15obj, flags, rv = sc_pkcs15_decipher(fw_data->p15_card, prkey->prv_p15obj, flags,
pEncryptedData, ulEncryptedDataLen, decrypted, sizeof(decrypted)); pEncryptedData, ulEncryptedDataLen, decrypted, sizeof(decrypted));
- if (rv < 0 && !sc_pkcs11_conf.lock_login && !prkey_has_path) - if (rv < 0 && !sc_pkcs11_conf.lock_login && !prkey_has_path)
+ if (!((flags & SC_ALGORITHM_RSA_PAD_PKCS1) && constant_time_eq_s(rv, SC_ERROR_WRONG_PADDING)) && + /* skip for PKCS#1 v1.5 padding prevent side channel attack */
+ if (!(flags & SC_ALGORITHM_RSA_PAD_PKCS1) &&
+ rv < 0 && !sc_pkcs11_conf.lock_login && !prkey_has_path) + rv < 0 && !sc_pkcs11_conf.lock_login && !prkey_has_path)
if (reselect_app_df(fw_data->p15_card) == SC_SUCCESS) if (reselect_app_df(fw_data->p15_card) == SC_SUCCESS)
rv = sc_pkcs15_decipher(fw_data->p15_card, prkey->prv_p15obj, flags, rv = sc_pkcs15_decipher(fw_data->p15_card, prkey->prv_p15obj, flags,
@ -299,31 +368,45 @@ index 809cd72d9..9c75759a0 100644
sc_unlock(p11card->card); sc_unlock(p11card->card);
- sc_log(context, "Decryption complete. Result %d.", rv); - sc_log(context, "Decryption complete. Result %d.", rv);
+ /* Handle buffer after PKCS#1 v1.5 depadding constant-time */
+ if (flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
+ CK_ULONG mask, good, rv_pkcs11;
+
+ sc_log(context, "Decryption complete."); + sc_log(context, "Decryption complete.");
+ /* only padding error must be handled in constant-time way */
+ if ((~constant_time_eq_s(rv, SC_ERROR_WRONG_PADDING) & constant_time_lt_s(sizeof(decrypted), rv))) - if (rv < 0)
+ /* Handle following code in constant-time
return sc_to_cryptoki_error(rv, "C_Decrypt");
+ * to prevent Marvin attack for PKCS#1 v1.5 padding. */
- buff_too_small = (*pulDataLen < (CK_ULONG)rv);
- *pulDataLen = rv;
- if (pData == NULL_PTR)
- return CKR_OK;
- if (buff_too_small)
- return CKR_BUFFER_TOO_SMALL;
- memcpy(pData, decrypted, *pulDataLen);
-
- return CKR_OK;
+ /* only padding error must be handled in constant-time way,
+ * other error can be returned straight away */
+ if ((~constant_time_eq_i(rv, SC_ERROR_WRONG_PADDING) & constant_time_lt_s(sizeof(decrypted), (size_t)rv)))
+ return sc_to_cryptoki_error(rv, "C_Decrypt"); + return sc_to_cryptoki_error(rv, "C_Decrypt");
+ +
+ /* check rv for error */ + /* check rv for padding error */
+ good = ~constant_time_eq_s(rv, SC_ERROR_WRONG_PADDING); + good = ~constant_time_eq_i(rv, SC_ERROR_WRONG_PADDING);
+ rv_pkcs11 = constant_time_select_s(good, CKR_OK, SC_ERROR_WRONG_PADDING); + rv_pkcs11 = sc_to_cryptoki_error(SC_ERROR_WRONG_PADDING, "C_Decrypt");
+ rv_pkcs11 = constant_time_select_s(good, CKR_OK, rv_pkcs11);
+
+ if (pData == NULL_PTR) { + if (pData == NULL_PTR) {
+ /* set length only if rv good */ + /* set length only if no error */
+ *pulDataLen = constant_time_select_s(good, rv, *pulDataLen); + *pulDataLen = constant_time_select_s(good, rv, *pulDataLen);
+ /* return error only if original rv < 0 */ + /* return error only if original rv < 0 */
+ return rv_pkcs11; + return rv_pkcs11;
+ } + }
+ +
+ /* check whether *pulDataLen < rv and set return value accordingly */ + /* check whether *pulDataLen < rv and set return value for small output buffer */
+ mask = good & constant_time_lt_s(*pulDataLen, rv); + mask = good & constant_time_lt_s(*pulDataLen, rv);
+ rv_pkcs11 = constant_time_select_s(mask, CKR_BUFFER_TOO_SMALL, rv_pkcs11); + rv_pkcs11 = constant_time_select_s(mask, CKR_BUFFER_TOO_SMALL, rv_pkcs11);
+ good &= ~mask; + good &= ~mask;
+
+ /* move everything from decrypted into out buffer, if rv is ok */ + /* move everything from decrypted into out buffer constant-time, if rv is ok */
+ for (CK_ULONG i = 0; i < *pulDataLen; i++) { /* iterate over whole pData to not disclose real depadded length */ + for (CK_ULONG i = 0; i < *pulDataLen; i++) { /* iterate over whole pData to not disclose real depadded length */
+ CK_ULONG msg_index; + CK_ULONG msg_index;
+ mask = good & constant_time_lt_s(i, sizeof(decrypted)); /* i should be in the bounds of decrypted */ + mask = good & constant_time_lt_s(i, sizeof(decrypted)); /* i should be in the bounds of decrypted */
@ -332,33 +415,64 @@ index 809cd72d9..9c75759a0 100644
+ pData[i] = constant_time_select_8(mask, decrypted[msg_index], pData[i]); + pData[i] = constant_time_select_8(mask, decrypted[msg_index], pData[i]);
+ } + }
+ *pulDataLen = constant_time_select_s(good, rv, *pulDataLen); + *pulDataLen = constant_time_select_s(good, rv, *pulDataLen);
+ /* do not log error code to prevent side channel attack */
+ return rv_pkcs11; + return rv_pkcs11;
+ } }
+
+ sc_log(context, "Decryption complete. Result %d.", rv);
if (rv < 0)
return sc_to_cryptoki_error(rv, "C_Decrypt");
@@ -4622,7 +4659,6 @@ pkcs15_prkey_decrypt(struct sc_pkcs11_session *session, void *obj,
if (buff_too_small) diff --git a/src/pkcs11/mechanism.c b/src/pkcs11/mechanism.c
return CKR_BUFFER_TOO_SMALL; index 03495265a4..d3f0434231 100644
memcpy(pData, decrypted, *pulDataLen); --- a/src/pkcs11/mechanism.c
- +++ b/src/pkcs11/mechanism.c
return CKR_OK; @@ -23,6 +23,7 @@
#include <stdlib.h>
#include <string.h>
+#include "common/constant-time.h"
#include "sc-pkcs11.h"
/* Also used for verification data */
@@ -1089,7 +1090,9 @@ sc_pkcs11_decr(struct sc_pkcs11_session
rv = op->type->decrypt(op, pEncryptedData, ulEncryptedDataLen,
pData, pulDataLen);
- if (rv != CKR_BUFFER_TOO_SMALL && pData != NULL)
+ /* terminate session for any return value except CKR_BUFFER_TOO_SMALL,
+ * perform check in time side-channel free way to prevent Marvin attack */
+ if (!constant_time_eq_s(rv, CKR_BUFFER_TOO_SMALL) && pData != NULL)
session_stop_operation(session, SC_PKCS11_OPERATION_DECRYPT);
return rv;
diff --git a/src/pkcs11/pkcs11-object.c b/src/pkcs11/pkcs11-object.c
index f04c0b4c56..b023911213 100644
--- a/src/pkcs11/pkcs11-object.c
+++ b/src/pkcs11/pkcs11-object.c
@@ -926,7 +926,8 @@ CK_RV C_Decrypt(CK_SESSION_HANDLE hSessi
rv = reset_login_state(session->slot, rv);
}
- sc_log(context, "C_Decrypt() = %s", lookup_enum ( RV_T, rv ));
+ /* do not log error code to prevent side channel attack */
+ sc_log(context, "C_Decrypt() finished");
sc_pkcs11_unlock();
return rv;
} }
diff --git a/src/pkcs11/misc.c b/src/pkcs11/misc.c diff --git a/src/pkcs11/misc.c b/src/pkcs11/misc.c
index 5ca1176b1..2893b2bf3 100644 index 5ca1176b1d..1d893d6181 100644
--- a/src/pkcs11/misc.c --- a/src/pkcs11/misc.c
+++ b/src/pkcs11/misc.c +++ b/src/pkcs11/misc.c
@@ -24,6 +24,7 @@ @@ -23,6 +23,7 @@
#include <stdlib.h>
#include <string.h> #include <string.h>
#include "sc-pkcs11.h"
+#include "common/constant-time.h" +#include "common/constant-time.h"
#include "sc-pkcs11.h"
#define DUMP_TEMPLATE_MAX 32 #define DUMP_TEMPLATE_MAX 32
@@ -174,7 +175,7 @@ CK_RV reset_login_state(struct sc_pkcs11_slot *slot, CK_RV rv) @@ -174,7 +175,7 @@ CK_RV reset_login_state(struct sc_pkcs11_slot *slot, CK_RV rv)
slot->p11card->framework->logout(slot); slot->p11card->framework->logout(slot);
} }
@ -368,50 +482,4 @@ index 5ca1176b1..2893b2bf3 100644
slot->login_user = -1; slot->login_user = -1;
pop_all_login_states(slot); pop_all_login_states(slot);
} }
diff --git a/src/pkcs11/pkcs11-object.c b/src/pkcs11/pkcs11-object.c
index f04c0b4c5..93cc319c2 100644
--- a/src/pkcs11/pkcs11-object.c
+++ b/src/pkcs11/pkcs11-object.c
@@ -1034,7 +1034,7 @@ C_Decrypt(CK_SESSION_HANDLE hSession, /* the session's handle */
rv = reset_login_state(session->slot, rv);
}
- sc_log(context, "C_Decrypt() = %s", lookup_enum ( RV_T, rv ));
+ sc_log(context, "C_Decrypt()");
sc_pkcs11_unlock();
return rv;
}
diff --git a/src/libopensc/padding.c b/src/libopensc/padding.c
index ceb2a1e21..c2cc58d47 100644
--- a/src/libopensc/padding.c
+++ b/src/libopensc/padding.c
@@ -192,7 +192,7 @@ int
sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const u8 *data, unsigned int data_len, u8 *out, unsigned int *out_len)
{
unsigned int i = 0;
- u8 *msg = NULL;
+ u8 *msg, *msg_orig = NULL;
unsigned int good, found_zero_byte, mask;
unsigned int zero_index = 0, msg_index, mlen = -1, len = 0;
LOG_FUNC_CALLED(ctx);
@@ -200,7 +200,7 @@ sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const
if (data == NULL || data_len <= 0 || data_len > n || n < SC_PKCS1_PADDING_MIN_SIZE)
LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
- msg = calloc(n, sizeof(u8));
+ msg = msg_orig = calloc(n, sizeof(u8));
if (msg == NULL)
LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
@@ -261,7 +261,7 @@ sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const
out[i] = constant_time_select_8(mask, msg[msg_index], out[i]);
}
- free(msg);
+ free(msg_orig);
return constant_time_select(good, mlen, SC_ERROR_WRONG_PADDING);
}
--
2.43.0