Mercurial > dropbear
view ecdsa.h @ 1715:3974f087d9c0
Disallow leading lines before the ident for server (#102)
Per RFC4253 4.2 clients must be able to process other lines of data
before the version string, server behavior is not defined neither
with MUST/SHOULD nor with MAY.
If server process up to 50 lines too - it may cause too long hanging
session with invalid/evil client that consume host resources and
potentially may lead to DDoS on poor embedded boxes.
Let's require first line from client to be version string and fail
early if it's not - matches both RFC and real OpenSSH behavior.
author | Vladislav Grishenko <themiron@users.noreply.github.com> |
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date | Mon, 15 Jun 2020 18:22:18 +0500 |
parents | 99ca393afc56 |
children |
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#ifndef DROPBEAR_ECDSA_H_ #define DROPBEAR_ECDSA_H_ #include "includes.h" #include "buffer.h" #include "signkey.h" #if DROPBEAR_ECDSA /* prefer 256 or 384 since those are SHOULD for draft-ietf-curdle-ssh-kex-sha2.txt */ #if DROPBEAR_ECC_256 #define ECDSA_DEFAULT_SIZE 256 #elif DROPBEAR_ECC_384 #define ECDSA_DEFAULT_SIZE 384 #elif DROPBEAR_ECC_521 #define ECDSA_DEFAULT_SIZE 521 #else #error ECDSA cannot be enabled without enabling at least one size (256, 384, 521) #endif ecc_key *gen_ecdsa_priv_key(unsigned int bit_size); ecc_key *buf_get_ecdsa_pub_key(buffer* buf); ecc_key *buf_get_ecdsa_priv_key(buffer *buf); void buf_put_ecdsa_pub_key(buffer *buf, ecc_key *key); void buf_put_ecdsa_priv_key(buffer *buf, ecc_key *key); enum signkey_type ecdsa_signkey_type(const ecc_key * key); void buf_put_ecdsa_sign(buffer *buf, const ecc_key *key, const buffer *data_buf); int buf_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf); /* Returns 1 on success */ int signkey_is_ecdsa(enum signkey_type type); #endif #endif /* DROPBEAR_ECDSA_H_ */