Upgrade openssl from 1.1.0e to 1.1.1b, with source code. 4.0.78

trunk/3rdparty/openssl-1.1-fit/crypto/rsa/rsa_ssl.c

@@ -0,0 +1,167 @@
+/*
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include "internal/cryptlib.h"
+#include <openssl/bn.h>
+#include <openssl/rsa.h>
+#include <openssl/rand.h>
+#include "internal/constant_time_locl.h"
+
+int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
+                           const unsigned char *from, int flen)
+{
+    int i, j;
+    unsigned char *p;
+
+    if (flen > (tlen - 11)) {
+        RSAerr(RSA_F_RSA_PADDING_ADD_SSLV23,
+               RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
+        return 0;
+    }
+
+    p = (unsigned char *)to;
+
+    *(p++) = 0;
+    *(p++) = 2;                 /* Public Key BT (Block Type) */
+
+    /* pad out with non-zero random data */
+    j = tlen - 3 - 8 - flen;
+
+    if (RAND_bytes(p, j) <= 0)
+        return 0;
+    for (i = 0; i < j; i++) {
+        if (*p == '\0')
+            do {
+                if (RAND_bytes(p, 1) <= 0)
+                    return 0;
+            } while (*p == '\0');
+        p++;
+    }
+
+    memset(p, 3, 8);
+    p += 8;
+    *(p++) = '\0';
+
+    memcpy(p, from, (unsigned int)flen);
+    return 1;
+}
+
+/*
+ * Copy of RSA_padding_check_PKCS1_type_2 with a twist that rejects padding
+ * if nul delimiter is preceded by 8 consecutive 0x03 bytes. It also
+ * preserves error code reporting for backward compatibility.
+ */
+int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
+                             const unsigned char *from, int flen, int num)
+{
+    int i;
+    /* |em| is the encoded message, zero-padded to exactly |num| bytes */
+    unsigned char *em = NULL;
+    unsigned int good, found_zero_byte, mask, threes_in_row;
+    int zero_index = 0, msg_index, mlen = -1, err;
+
+    if (flen < 10) {
+        RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_SMALL);
+        return -1;
+    }
+
+    em = OPENSSL_malloc(num);
+    if (em == NULL) {
+        RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, ERR_R_MALLOC_FAILURE);
+        return -1;
+    }
+    /*
+     * Caller is encouraged to pass zero-padded message created with
+     * BN_bn2binpad. Trouble is that since we can't read out of |from|'s
+     * bounds, it's impossible to have an invariant memory access pattern
+     * in case |from| was not zero-padded in advance.
+     */
+    for (from += flen, em += num, i = 0; i < num; i++) {
+        mask = ~constant_time_is_zero(flen);
+        flen -= 1 & mask;
+        from -= 1 & mask;
+        *--em = *from & mask;
+    }
+    from = em;
+
+    good = constant_time_is_zero(from[0]);
+    good &= constant_time_eq(from[1], 2);
+    err = constant_time_select_int(good, 0, RSA_R_BLOCK_TYPE_IS_NOT_02);
+    mask = ~good;
+
+    /* scan over padding data */
+    found_zero_byte = 0;
+    threes_in_row = 0;
+    for (i = 2; i < num; i++) {
+        unsigned int equals0 = constant_time_is_zero(from[i]);
+
+        zero_index = constant_time_select_int(~found_zero_byte & equals0,
+                                              i, zero_index);
+        found_zero_byte |= equals0;
+
+        threes_in_row += 1 & ~found_zero_byte;
+        threes_in_row &= found_zero_byte | constant_time_eq(from[i], 3);
+    }
+
+    /*
+     * PS must be at least 8 bytes long, and it starts two bytes into |from|.
+     * If we never found a 0-byte, then |zero_index| is 0 and the check
+     * also fails.
+     */
+    good &= constant_time_ge(zero_index, 2 + 8);
+    err = constant_time_select_int(mask | good, err,
+                                   RSA_R_NULL_BEFORE_BLOCK_MISSING);
+    mask = ~good;
+
+    good &= constant_time_lt(threes_in_row, 8);
+    err = constant_time_select_int(mask | good, err,
+                                   RSA_R_SSLV3_ROLLBACK_ATTACK);
+    mask = ~good;
+
+    /*
+     * Skip the zero byte. This is incorrect if we never found a zero-byte
+     * but in this case we also do not copy the message out.
+     */
+    msg_index = zero_index + 1;
+    mlen = num - msg_index;
+
+    /*
+     * For good measure, do this check in constant time as well.
+     */
+    good &= constant_time_ge(tlen, mlen);
+    err = constant_time_select_int(mask | good, err, RSA_R_DATA_TOO_LARGE);
+
+    /*
+     * Even though we can't fake result's length, we can pretend copying
+     * |tlen| bytes where |mlen| bytes would be real. Last |tlen| of |num|
+     * bytes are viewed as circular buffer with start at |tlen|-|mlen'|,
+     * where |mlen'| is "saturated" |mlen| value. Deducing information
+     * about failure or |mlen| would take attacker's ability to observe
+     * memory access pattern with byte granularity *as it occurs*. It
+     * should be noted that failure is indistinguishable from normal
+     * operation if |tlen| is fixed by protocol.
+     */
+    tlen = constant_time_select_int(constant_time_lt(num, tlen), num, tlen);
+    msg_index = constant_time_select_int(good, msg_index, num - tlen);
+    mlen = num - msg_index;
+    for (from += msg_index, mask = good, i = 0; i < tlen; i++) {
+        unsigned int equals = constant_time_eq(i, mlen);
+
+        from -= tlen & equals;  /* if (i == mlen) rewind   */
+        mask &= mask ^ equals;  /* if (i == mlen) mask = 0 */
+        to[i] = constant_time_select_8(mask, from[i], to[i]);
+    }
+
+    OPENSSL_clear_free(em, num);
+    RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, err);
+    err_clear_last_constant_time(1 & good);
+
+    return constant_time_select_int(good, mlen, -1);
+}