File 0001-RT-4242-reject-invalid-EC-point-coordinate... of Package openssl

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File 0001-RT-4242-reject-invalid-EC-point-coordinates.patch of Package openssl (Revision 5a88342563ffcbe6a98674a639f0e8fc)

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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-1.0.2j/crypto/ec/ec2_oct.c
===================================================================
--- openssl-1.0.2j.orig/crypto/ec/ec2_oct.c	2016-09-26 11:49:07.000000000 +0200
+++ openssl-1.0.2j/crypto/ec/ec2_oct.c	2019-04-10 14:40:09.559862161 +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-1.0.2j/crypto/ec/ec_lib.c
===================================================================
--- openssl-1.0.2j.orig/crypto/ec/ec_lib.c	2016-09-26 11:49:07.000000000 +0200
+++ openssl-1.0.2j/crypto/ec/ec_lib.c	2019-04-10 14:40:09.559862161 +0200
@@ -856,7 +856,15 @@ 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
@@ -874,7 +882,15 @@ 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-1.0.2j/crypto/ec/ecp_oct.c
===================================================================
--- openssl-1.0.2j.orig/crypto/ec/ecp_oct.c	2016-09-26 11:49:07.000000000 +0200
+++ openssl-1.0.2j/crypto/ec/ecp_oct.c	2019-04-10 14:40:09.559862161 +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-1.0.2j/crypto/ec/ectest.c
===================================================================
--- openssl-1.0.2j.orig/crypto/ec/ectest.c	2016-09-26 11:49:07.000000000 +0200
+++ openssl-1.0.2j/crypto/ec/ectest.c	2019-04-10 14:40:09.559862161 +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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