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: $app_banners"
^-- SC2031: app_banners was modified in a subshell. That change might be lost.
```
Found by ShellCheck.
This commit fixes the following two instances of referenced but not assigned
variables:
```
In testssl.sh line 1159:
rp_banners="$rp_bannersline"
^-- SC2154: rp_bannersline is referenced but not assigned.
In testssl.sh line 1193:
app_banners="$app_bannersline"
^-- SC2154: app_bannersline is referenced but not assigned.
```
Found by ShellCheck.
The argument to -nextprotoneg is provided in sometimes empty an unquoted
variables. Because of the missing quotes, the next word on the line "-status"
gets parsed as "-nextprotoneg"'s argument instead of enabling the OCSP status
check.
This fixes#467.
Fix referenced but not assigned variable 'sign_algo'.
In testssl.sh line 4309:
fileout "${json_prefix}algorithm" "DEBUG" "Signature Algorithm: $sign_algo"
^-- SC2154: sign_algo is referenced but not assigned.
Found by ShellCheck.
Two instances of referenced but not assigned variables ('req' instead of
'ret').
In testssl.sh line 4130:
if [[ $req -eq 0 ]]; then
^-- SC2154: req is referenced but not assigned.
Found by ShellCheck.
`socksend_tls_clienthello()` always includes a server name extension in the ClientHello (for TLS 1.0 and above), even if `$SNI` is empty. If `$NODE` is an IP address, then the IP address is placed in the extension, even though RFC 6066 says that only DNS names are supported in the extension.
This PR changes `socksend_tls_clienthello()` so that the server name extension is only included in the ClientHello is `$SNI` is not empty.
This PR is an attempt to address issue #447. If more than one certificate is being displayed, then a parenthetical saying "(in response to request w/o SNI)" is added for any certificate that was obtained using `$SNI=""`.
In addition, if the certificate was obtained without SNI, then `certificate_info()` doesn't call `$OPENSSL s_client` in order to obtain the non-SNI host certificate and it does not display a separate "Trust (hostname)" finding for the non-SNI certificate.
Dirk Wetter
Weida Hong
Daniel Reichelt
David Cooper
Karsten Weiss