diff options
Diffstat (limited to 'ssl')
| -rw-r--r-- | ssl/record/rec_layer_s3.c | 17 | ||||
| -rw-r--r-- | ssl/record/ssl3_buffer.c | 9 |
2 files changed, 19 insertions, 7 deletions
diff --git a/ssl/record/rec_layer_s3.c b/ssl/record/rec_layer_s3.c index fe4abd672308..1db1712a0986 100644 --- a/ssl/record/rec_layer_s3.c +++ b/ssl/record/rec_layer_s3.c @@ -16,6 +16,7 @@ #include <openssl/rand.h> #include "record_local.h" #include "../packet_local.h" +#include "internal/cryptlib.h" #if defined(OPENSSL_SMALL_FOOTPRINT) || \ !( defined(AESNI_ASM) && ( \ @@ -983,11 +984,14 @@ int do_ssl3_write(SSL *s, int type, const unsigned char *buf, } /* - * Reserve some bytes for any growth that may occur during encryption. - * This will be at most one cipher block or the tag length if using - * AEAD. SSL_RT_MAX_CIPHER_BLOCK_SIZE covers either case. - */ - if (!WPACKET_reserve_bytes(thispkt, SSL_RT_MAX_CIPHER_BLOCK_SIZE, + * Reserve some bytes for any growth that may occur during encryption. If + * we are adding the MAC independently of the cipher algorithm, then the + * max encrypted overhead does not need to include an allocation for that + * MAC + */ + if (!WPACKET_reserve_bytes(thispkt, + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + - mac_size, NULL) /* * We also need next the amount of bytes written to this @@ -1037,6 +1041,9 @@ int do_ssl3_write(SSL *s, int type, const unsigned char *buf, /* Allocate bytes for the encryption overhead */ if (!WPACKET_get_length(thispkt, &origlen) + /* Check we allowed enough room for the encryption growth */ + || !ossl_assert(origlen + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + - mac_size >= thiswr->length) /* Encryption should never shrink the data! */ || origlen > thiswr->length || (thiswr->length > origlen diff --git a/ssl/record/ssl3_buffer.c b/ssl/record/ssl3_buffer.c index b9ba25e0c3f8..fa597c274671 100644 --- a/ssl/record/ssl3_buffer.c +++ b/ssl/record/ssl3_buffer.c @@ -1,5 +1,5 @@ /* - * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. + * Copyright 1995-2023 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 @@ -97,11 +97,16 @@ int ssl3_setup_write_buffer(SSL *s, size_t numwpipes, size_t len) #endif len = ssl_get_max_send_fragment(s) - + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align; + + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align + + SSL_RT_MAX_CIPHER_BLOCK_SIZE /* Explicit IV allowance */; #ifndef OPENSSL_NO_COMP if (ssl_allow_compression(s)) len += SSL3_RT_MAX_COMPRESSED_OVERHEAD; #endif + /* + * We don't need to add an allowance for eivlen here since empty + * fragments only occur when we don't have an explicit IV + */ if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD; } |