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openssl-1_0_0.21013
0001-RT-4242-reject-invalid-EC-point-coordinate...
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File 0001-RT-4242-reject-invalid-EC-point-coordinates.patch of Package openssl-1_0_0.21013
From 1e2012b7ff4a5f12273446b281775faa5c8a1858 Mon Sep 17 00:00:00 2001 From: Emilia Kasper <emilia@openssl.org> Date: Fri, 3 Jun 2016 14:42:04 +0200 Subject: [PATCH] RT 4242: reject invalid EC point coordinates We already test in EC_POINT_oct2point that points are on the curve. To be on the safe side, move this check to EC_POINT_set_affine_coordinates_* so as to also check point coordinates received through some other method. We do not check projective coordinates, though, as - it's unlikely that applications would be receiving this primarily internal representation from untrusted sources, and - it's possible that the projective setters are used in a setting where performance matters. Reviewed-by: Rich Salz <rsalz@openssl.org> --- crypto/ec/ec2_oct.c | 10 ++--- crypto/ec/ec_lib.c | 20 +++++++++- crypto/ec/ecp_oct.c | 10 ++--- test/ectest.c | 96 ++++++++++++++++++++++++++++++++++++++++++--- 4 files changed, 116 insertions(+), 20 deletions(-) Index: openssl-1.0.2p/crypto/ec/ec2_oct.c =================================================================== --- openssl-1.0.2p.orig/crypto/ec/ec2_oct.c 2019-09-19 14:48:44.232862967 +0200 +++ openssl-1.0.2p/crypto/ec/ec2_oct.c 2019-09-19 14:48:46.716878290 +0200 @@ -382,16 +382,14 @@ int ec_GF2m_simple_oct2point(const EC_GR } } + /* + * EC_POINT_set_affine_coordinates_GF2m is responsible for checking that + * the point is on the curve. + */ if (!EC_POINT_set_affine_coordinates_GF2m(group, point, x, y, ctx)) goto err; } - /* test required by X9.62 */ - if (EC_POINT_is_on_curve(group, point, ctx) <= 0) { - ECerr(EC_F_EC_GF2M_SIMPLE_OCT2POINT, EC_R_POINT_IS_NOT_ON_CURVE); - goto err; - } - ret = 1; err: Index: openssl-1.0.2p/crypto/ec/ec_lib.c =================================================================== --- openssl-1.0.2p.orig/crypto/ec/ec_lib.c 2019-09-19 14:48:44.236862993 +0200 +++ openssl-1.0.2p/crypto/ec/ec_lib.c 2019-09-19 14:48:46.716878290 +0200 @@ -948,7 +948,15 @@ int EC_POINT_set_affine_coordinates_GFp( EC_R_INCOMPATIBLE_OBJECTS); return 0; } - return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); + if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx)) + return 0; + + if (EC_POINT_is_on_curve(group, point, ctx) <= 0) { + ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, + EC_R_POINT_IS_NOT_ON_CURVE); + return 0; + } + return 1; } #ifndef OPENSSL_NO_EC2M @@ -966,7 +974,15 @@ int EC_POINT_set_affine_coordinates_GF2m EC_R_INCOMPATIBLE_OBJECTS); return 0; } - return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); + if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx)) + return 0; + + if (EC_POINT_is_on_curve(group, point, ctx) <= 0) { + ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, + EC_R_POINT_IS_NOT_ON_CURVE); + return 0; + } + return 1; } #endif Index: openssl-1.0.2p/crypto/ec/ecp_oct.c =================================================================== --- openssl-1.0.2p.orig/crypto/ec/ecp_oct.c 2019-09-19 14:48:44.236862993 +0200 +++ openssl-1.0.2p/crypto/ec/ecp_oct.c 2019-09-19 14:48:46.716878290 +0200 @@ -408,16 +408,14 @@ int ec_GFp_simple_oct2point(const EC_GRO } } + /* + * EC_POINT_set_affine_coordinates_GFp is responsible for checking that + * the point is on the curve. + */ if (!EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx)) goto err; } - /* test required by X9.62 */ - if (EC_POINT_is_on_curve(group, point, ctx) <= 0) { - ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_POINT_IS_NOT_ON_CURVE); - goto err; - } - ret = 1; err: Index: openssl-1.0.2p/crypto/ec/ectest.c =================================================================== --- openssl-1.0.2p.orig/crypto/ec/ectest.c 2019-09-19 14:48:44.236862993 +0200 +++ openssl-1.0.2p/crypto/ec/ectest.c 2019-09-19 14:49:50.269270342 +0200 @@ -325,7 +325,7 @@ static void prime_field_tests(void) EC_GROUP *P_160 = NULL, *P_192 = NULL, *P_224 = NULL, *P_256 = NULL, *P_384 = NULL, *P_521 = NULL; EC_POINT *P, *Q, *R; - BIGNUM *x, *y, *z; + BIGNUM *x, *y, *z, *yplusone; unsigned char buf[100]; size_t i, len; int k; @@ -405,7 +405,8 @@ static void prime_field_tests(void) x = BN_new(); y = BN_new(); z = BN_new(); - if (!x || !y || !z) + yplusone = BN_new(); + if (x == NULL || y == NULL || z == NULL || yplusone == NULL) ABORT; if (!BN_hex2bn(&x, "D")) @@ -542,6 +543,14 @@ static void prime_field_tests(void) ABORT; if (!BN_hex2bn(&y, "23a628553168947d59dcc912042351377ac5fb32")) ABORT; + if (!BN_add(yplusone, y, BN_value_one())) + ABORT; + /* + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, + * and therefore setting the coordinates should fail. + */ + if (EC_POINT_set_affine_coordinates_GFp(group, P, x, yplusone, ctx)) + ABORT; if (!EC_POINT_set_affine_coordinates_GFp(group, P, x, y, ctx)) ABORT; if (EC_POINT_is_on_curve(group, P, ctx) <= 0) @@ -613,6 +622,15 @@ static void prime_field_tests(void) if (0 != BN_cmp(y, z)) ABORT; + if (!BN_add(yplusone, y, BN_value_one())) + ABORT; + /* + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, + * and therefore setting the coordinates should fail. + */ + if (EC_POINT_set_affine_coordinates_GFp(group, P, x, yplusone, ctx)) + ABORT; + fprintf(stdout, "verify degree ..."); if (EC_GROUP_get_degree(group) != 192) ABORT; @@ -668,6 +686,15 @@ static void prime_field_tests(void) if (0 != BN_cmp(y, z)) ABORT; + if (!BN_add(yplusone, y, BN_value_one())) + ABORT; + /* + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, + * and therefore setting the coordinates should fail. + */ + if (EC_POINT_set_affine_coordinates_GFp(group, P, x, yplusone, ctx)) + ABORT; + fprintf(stdout, "verify degree ..."); if (EC_GROUP_get_degree(group) != 224) ABORT; @@ -728,6 +755,15 @@ static void prime_field_tests(void) if (0 != BN_cmp(y, z)) ABORT; + if (!BN_add(yplusone, y, BN_value_one())) + ABORT; + /* + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, + * and therefore setting the coordinates should fail. + */ + if (EC_POINT_set_affine_coordinates_GFp(group, P, x, yplusone, ctx)) + ABORT; + fprintf(stdout, "verify degree ..."); if (EC_GROUP_get_degree(group) != 256) ABORT; @@ -783,6 +819,15 @@ static void prime_field_tests(void) if (0 != BN_cmp(y, z)) ABORT; + if (!BN_add(yplusone, y, BN_value_one())) + ABORT; + /* + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, + * and therefore setting the coordinates should fail. + */ + if (EC_POINT_set_affine_coordinates_GFp(group, P, x, yplusone, ctx)) + ABORT; + fprintf(stdout, "verify degree ..."); if (EC_GROUP_get_degree(group) != 384) ABORT; @@ -844,6 +889,15 @@ static void prime_field_tests(void) if (0 != BN_cmp(y, z)) ABORT; + if (!BN_add(yplusone, y, BN_value_one())) + ABORT; + /* + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, + * and therefore setting the coordinates should fail. + */ + if (EC_POINT_set_affine_coordinates_GFp(group, P, x, yplusone, ctx)) + ABORT; + fprintf(stdout, "verify degree ..."); if (EC_GROUP_get_degree(group) != 521) ABORT; @@ -858,6 +912,10 @@ static void prime_field_tests(void) /* more tests using the last curve */ + /* Restore the point that got mangled in the (x, y + 1) test. */ + if (!EC_POINT_set_affine_coordinates_GFp(group, P, x, y, ctx)) + ABORT; + if (!EC_POINT_copy(Q, P)) ABORT; if (EC_POINT_is_at_infinity(group, Q)) @@ -987,6 +1045,7 @@ static void prime_field_tests(void) BN_free(x); BN_free(y); BN_free(z); + BN_free(yplusone); if (P_160) EC_GROUP_free(P_160); @@ -1007,6 +1066,13 @@ static void prime_field_tests(void) # ifdef OPENSSL_EC_BIN_PT_COMP # define CHAR2_CURVE_TEST_INTERNAL(_name, _p, _a, _b, _x, _y, _y_bit, _order, _cof, _degree, _variable) \ if (!BN_hex2bn(&x, _x)) ABORT; \ + if (!BN_hex2bn(&y, _y)) ABORT; \ + if (!BN_add(yplusone, y, BN_value_one())) ABORT; \ + /* \ + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, \ + * and therefore setting the coordinates should fail. \ + */ \ + if (EC_POINT_set_affine_coordinates_GF2m(group, P, x, yplusone, ctx)) ABORT; \ if (!EC_POINT_set_compressed_coordinates_GF2m(group, P, x, _y_bit, ctx)) ABORT; \ if (EC_POINT_is_on_curve(group, P, ctx) <= 0) ABORT; \ if (!BN_hex2bn(&z, _order)) ABORT; \ @@ -1025,6 +1091,12 @@ static void prime_field_tests(void) # define CHAR2_CURVE_TEST_INTERNAL(_name, _p, _a, _b, _x, _y, _y_bit, _order, _cof, _degree, _variable) \ if (!BN_hex2bn(&x, _x)) ABORT; \ if (!BN_hex2bn(&y, _y)) ABORT; \ + if (!BN_add(yplusone, y, BN_value_one())) ABORT; \ + /* \ + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, \ + * and therefore setting the coordinates should fail. \ + */ \ + if (EC_POINT_set_affine_coordinates_GF2m(group, P, x, yplusone, ctx)) ABORT; \ if (!EC_POINT_set_affine_coordinates_GF2m(group, P, x, y, ctx)) ABORT; \ if (EC_POINT_is_on_curve(group, P, ctx) <= 0) ABORT; \ if (!BN_hex2bn(&z, _order)) ABORT; \ @@ -1062,7 +1134,7 @@ static void char2_field_tests(void) EC_GROUP *C2_B163 = NULL, *C2_B233 = NULL, *C2_B283 = NULL, *C2_B409 = NULL, *C2_B571 = NULL; EC_POINT *P, *Q, *R; - BIGNUM *x, *y, *z, *cof; + BIGNUM *x, *y, *z, *cof, *yplusone; unsigned char buf[100]; size_t i, len; int k; @@ -1076,7 +1148,7 @@ static void char2_field_tests(void) p = BN_new(); a = BN_new(); b = BN_new(); - if (!p || !a || !b) + if (p == NULL || a == NULL || b == NULL) ABORT; if (!BN_hex2bn(&p, "13")) @@ -1142,7 +1214,8 @@ static void char2_field_tests(void) y = BN_new(); z = BN_new(); cof = BN_new(); - if (!x || !y || !z || !cof) + yplusone = BN_new(); + if (x == NULL || y == NULL || z == NULL || cof == NULL || yplusone == NULL) ABORT; if (!BN_hex2bn(&x, "6")) @@ -1504,6 +1577,7 @@ static void char2_field_tests(void) BN_free(y); BN_free(z); BN_free(cof); + BN_free(yplusone); if (C2_K163) EC_GROUP_free(C2_K163); @@ -1672,7 +1746,7 @@ static const struct nistp_test_params ni static void nistp_single_test(const struct nistp_test_params *test) { BN_CTX *ctx; - BIGNUM *p, *a, *b, *x, *y, *n, *m, *order; + BIGNUM *p, *a, *b, *x, *y, *n, *m, *order, *yplusone; EC_GROUP *NISTP; EC_POINT *G, *P, *Q, *Q_CHECK; @@ -1687,6 +1761,7 @@ static void nistp_single_test(const stru m = BN_new(); n = BN_new(); order = BN_new(); + yplusone = BN_new(); NISTP = EC_GROUP_new(test->meth()); if (!NISTP) @@ -1709,6 +1784,14 @@ static void nistp_single_test(const stru ABORT; if (!BN_hex2bn(&y, test->Qy)) ABORT; + if (!BN_add(yplusone, y, BN_value_one())) + ABORT; + /* + * When (x, y) is on the curve, (x, y + 1) is, as it happens, not, + * and therefore setting the coordinates should fail. + */ + if (EC_POINT_set_affine_coordinates_GFp(NISTP, Q_CHECK, x, yplusone, ctx)) + ABORT; if (!EC_POINT_set_affine_coordinates_GFp(NISTP, Q_CHECK, x, y, ctx)) ABORT; if (!BN_hex2bn(&x, test->Gx)) @@ -1811,6 +1894,7 @@ static void nistp_single_test(const stru BN_free(x); BN_free(y); BN_free(order); + BN_free(yplusone); BN_CTX_free(ctx); }
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