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MEDIUM: ssl/sample: add ssl_fc_supported_versions_bin sample fetch

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This new sample fetch allow to extract the binary list contained in the
supported_versions (43) TLS extensions.

https://datatracker.ietf.org/doc/html/rfc8446#section-4.2.1
This commit is contained in:
William Lallemand 2024-08-23 18:15:52 +02:00
parent ce7fb6628e
commit ac5c7158f9
2 changed files with 47 additions and 0 deletions
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12
doc/configuration.txt
View File

@ -23168,6 +23168,7 @@ ssl_fc_server_random binary
ssl_fc_session_id binary
ssl_fc_session_key binary
ssl_fc_sni string
ssl_fc_supported_versions_bin([<filter_option>]) binary
ssl_fc_use_keysize integer
ssl_s_der binary
ssl_s_chain_der binary
@ -23911,6 +23912,17 @@ ssl_fc_sni : string
ssl_fc_sni_end : suffix match
ssl_fc_sni_reg : regex match
ssl_fc_supported_versions_bin([<filter_option>]) : binary
Returns the content of the supported_versions (43) TLS extension presented
during the Client Hello. It provides a binary list of 2-bytes versions.
TLSv1.3 (0x0304), TLSv1.2 (0x0303).
This value can return only if the value "tune.ssl.capture-buffer-size" is set
greater than 0. Setting <filter_option> allows to filter returned data.
Accepted values:
0 : return the full list of ciphers (default)
1 : exclude GREASE (RFC8701) values from the output
ssl_fc_use_keysize : integer
Returns the symmetric cipher key size used in bits when the incoming
connection was made over an SSL/TLS transport layer.

35
src/ssl_sample.c
View File

@ -1984,6 +1984,40 @@ smp_fetch_ssl_fc_protocol_hello_id(const struct arg *args, struct sample *smp, c
return 1;
}
static int
smp_fetch_ssl_fc_supver_bin(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
struct buffer *smp_trash;
struct connection *conn;
struct ssl_capture *capture;
SSL *ssl;
conn = objt_conn(smp->sess->origin);
ssl = ssl_sock_get_ssl_object(conn);
if (!ssl)
return 0;
capture = SSL_get_ex_data(ssl, ssl_capture_ptr_index);
if (!capture)
return 0;
if (args[0].data.sint) {
smp_trash = get_trash_chunk();
exclude_tls_grease(capture->data + capture->supver_offset, capture->supver_len, smp_trash);
smp->data.u.str.area = smp_trash->area;
smp->data.u.str.data = smp_trash->data;
smp->flags = SMP_F_VOL_SESS;
smp->data.type = SMP_T_BIN;
} else {
smp->flags = SMP_F_VOL_SESS | SMP_F_CONST;
smp->data.type = SMP_T_BIN;
smp->data.u.str.area = capture->data + capture->supver_offset;
smp->data.u.str.data = capture->supver_len;
}
return 1;
}
static int
smp_fetch_ssl_fc_err_str(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
@ -2487,6 +2521,7 @@ static struct sample_fetch_kw_list sample_fetch_keywords = {ILH, {
{ "ssl_fc_extlist_bin", smp_fetch_ssl_fc_ext_bin, ARG1(0,SINT), NULL, SMP_T_STR, SMP_USE_L5CLI },
{ "ssl_fc_eclist_bin", smp_fetch_ssl_fc_ecl_bin, ARG1(0,SINT), NULL, SMP_T_STR, SMP_USE_L5CLI },
{ "ssl_fc_ecformats_bin", smp_fetch_ssl_fc_ecf_bin, 0, NULL, SMP_T_STR, SMP_USE_L5CLI },
{ "ssl_fc_supported_versions_bin", smp_fetch_ssl_fc_supver_bin, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_USE_L5CLI },
/* SSL server certificate fetches */
{ "ssl_s_der", smp_fetch_ssl_x_der, 0, NULL, SMP_T_BIN, SMP_USE_L5CLI },