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Cleanse buffers

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Cleanse various intermediate buffers used by the PRF (backported version
from master).

Reviewed-by: Richard Levitte <levitte@openssl.org>
This commit is contained in:
Matt Caswell 2015-03-09 13:59:58 +00:00
parent 0c14565c5b
commit 35fafc4dbc
2 changed files with 6 additions and 0 deletions
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1
ssl/s3_enc.c
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@ -877,6 +877,7 @@ int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
s, s->msg_callback_arg);
}
#endif
OPENSSL_cleanse(buf, sizeof buf);
return (ret);
}

5
ssl/t1_enc.c
View file

@ -976,6 +976,8 @@ int tls1_final_finish_mac(SSL *s,
err = 1;
EVP_MD_CTX_cleanup(&ctx);
OPENSSL_cleanse(buf, (int)(q - buf));
OPENSSL_cleanse(buf2, sizeof(buf2));
if (err)
return 0;
else
@ -1139,6 +1141,7 @@ int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
co, col,
s->s3->server_random, SSL3_RANDOM_SIZE,
so, sol, p, len, s->session->master_key, buff, sizeof buff);
OPENSSL_cleanse(buff, sizeof buff);
#ifdef SSL_DEBUG
fprintf(stderr, "Premaster Secret:\n");
BIO_dump_fp(stderr, (char *)p, len);
@ -1249,6 +1252,8 @@ int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
NULL, 0,
s->session->master_key, s->session->master_key_length,
out, buff, olen);
OPENSSL_cleanse(val, vallen);
OPENSSL_cleanse(buff, olen);
#ifdef KSSL_DEBUG
fprintf(stderr, "tls1_export_keying_material() complete\n");