This PR adds the option for `parse_sslv2_serverhello()` to extract information from the ServerHello (server key size and cipher suites supported) and write the information to `$TMPFILE` as well as to write the server's certificate to `$HOSTCERT`.
The mapping file is now only used in `show_rfc_style()`. This PR changes `show_rfc_style()` to use the `$TLS_CIPHER_HEXCODE` and `$TLS_CIPHER_RFC_NAME` arrays.
Note that `get_install_dir()` still searches for the mapping-rfc.txt in order to determine `$INSTALL_DIR`. `$INSTALL_DIR` is only used to determine the location of the CA bundles in `determine_trust()`:
```
local ca_bundles="$INSTALL_DIR/etc/*.pem"
```
This PR changes `sslv2_sockets()` so that a list of ciphers may optionally be passed as an argument. This will support the use of `sslv2_sockets()` in some places where `$OPENSSL s_client` is currently used.
s_client's manpage states for -nextprotoneg:
"Empty list of protocols is treated specially and will cause the client
to advertise support for the TLS extension but disconnect just after
reciving ServerHello with a list of server supported protocols."
Consequently, the previous workaround of just quoting an empty variable
is insufficient and the "-nextprotoneg" parameter has to be removed
entirely from the command-line in case of an empty argument.
In other locations where "-nextprotoneg" is used
- its argument cannot be empty ($NPN_PROTOs is initialized to a non-
empty value and set read-only) or
- its argument is intended to be empty (line 3724) or
- the command will not be invoked at all (for-loop parameter, line 3725)
This fixes#467 - again.
Additionally this patch prefers usage of -alpn over -nextprotoneg if the
openssl binary used supports it.
Refactor the while loop so it doesn't use a subshell anymore. Also use
"read -r" to prevent backslash escaping.
```
In testssl.sh line 1193:
app_banners="$app_bannersline"
^-- SC2030: Modification of app_banners is local (to subshell caused by pipeline).
In testssl.sh line 1195:
fileout "app_banner" "WARN" "Application Banners found: $app_banners"
^-- SC2031: app_banners was modified in a subshell. That change might be lost.
```
Found by ShellCheck.
Dirk
David Cooper
Weida Hong
Daniel Reichelt
Karsten Weiss