This PR changes testssl.sh so that when ciphers are being listed in wide mode (i.e., using `neat_list()`) and the `--show-each` option is set, ciphers that are not available are printed in light grey, whereas ciphers that are available continue to be printed in black. This makes it easier to distinguish between ciphers that are available and those that are not (the "available/"not a/v" column remains).
This PR does not change the way that ciphers that are available are printed, but it includes a hook that would allow that to change. For example, for ciphers that are available, the name of the cipher suite could be printed in a different color depending on its quality (as is done for the "Negotiated cipher" in `run_server_preference()`). The same could be done for the "Encryption" and "Bits" columns.
In some cases, the "TLS extensions" line output for the "--server-defaults" option will not show `"encrypt-then-mac/#22"` even if the server supports this extension. The reason is that a server will only include this extension in the ServerHello message if it supports the extension and the selected cipher is a CBC cipher. So, if `determine_tls_extensions()` connects to the server with a non-CBC cipher, then it will not detect if the server supports the encrypt-then-mac extension.
It is possible that support for the extension will be detected by `get_server_certificate()`, but only if one of the calls to that function results in a CBC cipher being selected and OpenSSL 1.1.0 is being used (as prior versions did not support the encrypt-then-mac extension).
In this PR, if `determine_tls_extensions()` is called and `$TLS_EXTENSIONS` does not already contain `"encrypt-then-mac/#22"`, then an attempt will be made to connect to the server with only CBC ciphers specified in the ClientHello. If the connection is not successful (presumably because the server does not support any CBC ciphers), then a second connection attempt will be made with the "default" ciphers being specified in the ClientHello.
en.wikipedia.org is an example of a server that supports the encrypt-then-mac extension, but for which the support is not currently detected (unless OpenSSL 1.1.0 is used) since in the call to `determine_tls_extension()` a non-CBC cipher is selected.
This PR changes `read_dhbits_from_file()` so that, when the "quiet" parameter is absent, the selected curve is shown in addition to the number of bits. This PR only affects the output of `run_client_simulation()` and the `Negotiated cipher` in `run_server_preference()`.
There are two places in `run_client_simulation()` in which `$OPENSSL s_client` is called, after which there is a `debugme echo` line to display the `$OPENSSL s_client` command line when testssl.sh is being run in debug mode, and then `sclient_connect_successful $? $TMPFILE` is called to determine whether `$OPENSSL s_client` successfully established a connection.
So, `sclient_connect_successful()` is being passed the result of the `debugme()` call, which always returns 0, rather than the result of the `$OPENSSL s_client` call.
This PR fixes the problem by moving the `debugme()` line to before the call to `$OPENSSL s_client`, so that `sclient_connect_successful()` is passed the results of the `$OPENSSL s_client` call.
This PR adds a new utility that generates the various static cipher lists that appear in testssl.sh.
This utility serves two purposes:
* It can be run whenever new ciphers are added to cipher-mapping.txt to see if any of the lists in testssl.sh need to be updated. (This includes if cipher-mapping.txt is modified to add OpenSSL-style names for ciphers that are currently listed, but that have not yet been assigned such names.)
* It can be used as a reference in order to understand how each of the lists is defined.
Starting with OpenSSL 1.1.0, s_client will not offer TLS compression methods, even if OpenSSL is compiled with zlib support, unless the `-comp` flag is included in the command line.
This PR changes `run_crime()` to use `tls_sockets()` rather than failing if `$OPENSSL` lacks zlib support, unless `$SSL_NATIVE` is `true`.
At the moment, the ClientHello created by `socksend_tls_clienthello()` only specifies the NULL compression method. So, this PR adds a new parameter to `socksend_tls_clienthello()` and `tls_sockets()` to allow to caller to request that additional compression methods (DEFLATE and LZS) be specified in the ClientHello.
This PR makes another change to `run_crime()`. At the moment, if `$OPENSSL s_client` fails to connect to the server, `run_crime()` will report that the server is not vulnerable, since the output from `$OPENSSL s_client` includes the line "Compression: NONE" (see below). This PR changes that by checking whether the connection was successful, and reporting a "test failed (couldn't connect)" warning if it wasn't successful, rather than reporting "not vulnerable (OK)".
```
CONNECTED(00000003)
140338777061024:error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version:s23_clnt.c:769:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 7 bytes and written 389 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
Protocol : TLSv1
Cipher : 0000
Session-ID:
Session-ID-ctx:
Master-Key:
Key-Arg : None
PSK identity: None
PSK identity hint: None
SRP username: None
Start Time: 1483645971
Timeout : 300 (sec)
Verify return code: 0 (ok)
---
```
This PR fixes a few bugs in `sslv2_sockets()`. The main issue is that a server may not send the entire ServerHello in a single packet. If it doesn't and the full response is being parsed (i.e., certificate and list of ciphers), then `parse_sslv2_serverhello()` will encounter errors, since it assumes that it has the entire ServerHello. This PR compares the length of the response to the length of the ServerHello as specified in the first two bytes of the response and requests more data from the server if the response appears incomplete.
This PR also modifies `parse_sslv2_serverhello()` to check for more errors. It compares the length of the response it has been provided to the specified length (`$v2_hello_length`) and returns an error if the response is shorter than `$v2_hello_length` and the full response is supposed to be parsed. It will also check whether there was an error in converting the certificate from DER to PEM format and will return an error if there was (and it will suppress the error message).
Some servers respond to an SSLv2 ClientHello with a list of all SSLv2 ciphers that the server supports rather than just a list of ciphers that it supports in common with the client (i.e., that appear in the ClientHello). This PR changes the sockets version of `std_cipherlists()` so that, if `sslv2_sockets()` is successful, it checks whether there are any ciphers in common between the ClientHello and the ServerHello before declaring that the server supports the specified cipher list.
Some servers respond to an SSLv2 ClientHello with a list of all SSLv2 ciphers that the server supports rather than just a list of ciphers that it supports in common with the client (i.e., that appear in the ClientHello). This PR changes the sockets version of `run_freak()` so that, if `sslv2_sockets()` is successful, it checks whether there are any ciphers in common between the ClientHello and the ServerHello before declaring that the server supports an export RSA cipher.
If `determine_tls_extensions()` does not create a temporary file (`$TEMPDIR/$NODEIP.determine_tls_extensions.txt`) then `run_server_defaults()` will display error messages when an attempt is made to copy this file or to search (grep) it. This may happen if `$OPTIMAL_PROTO` is `-ssl2` or if `determine_tls_extensions()` uses sockets and `parse_tls_serverhello()` encountered an error and did not create a temporary file (`$TEMPDIR/$NODEIP.parse_tls_serverhello.txt`). This PR fixes this by only trying to copy and search `$TEMPDIR/$NODEIP.determine_tls_extensions.txt` is `$OPTIMAL_PROTO` is not `-ssl2` and `determine_tls_extensions()` was successful (return value 0).
In response to your request in #572, this PR provides a starting point for addressing #120. It adds code to `run_logjam()` to try connecting to the server using any cipher that uses an ephemeral DH key. If successful, it gets the server's ephemeral key (in OpenSSL's PEM format) and then extracts the prime from the key and places it in `$dh_p`. So, all that needs to be done at this point is to compare `$dh_p` against a set of "bad" primes. I'm not sure if I'll be able to work on that part soon, so if someone else has the time, that would be great.
I actually found the `-msg` option easy to use. I moved the code in `parse_tls_serverhello()` that extracts the DH ephemeral public key from the ServerKeyExchange message into a separate function. Then, if using OpenSSL with the `-msg` option, I extract the ServerKeyExchange message from `$TMPFILE` and call this new function to extract the key and convert it to PEM format. That way the new code in `run_logjam()` can use either `$OPENSSL` or `tls_sockets()`.
This PR changes `run_http2()` so that it uses `tls_sockets()` rather than failing, if `$OPENSSL` does not support the `-alpn` option. If `$OPENSSL` supports the `-alpn` option (or if `$SSL_NATIVE` is true), then this PR has no effect.
This PR change `run_std_cipherlists()` to use sockets. As noted in isse #554, I have some questions about the definitions of the cipher lists, but I wrote the code so that the ciphers that are tested when using sockets are the same as those that are tested when using OpenSSL. For a few of the cipherlists, the sockets version tests a few additional ciphers; but these are ciphers that are not supported by OpenSSL, and whose definitions are consistent with the ciphers that OpenSSL includes.
As written, `std_cipherlists` will use sockets for testing by default, except in two cases:
* If the `$SSL_NATIVE` is true, then only OpenSSL is used, and if OpenSSL doesn't support any ciphers in the cipherlist, then the test is skipped.
* If `$FAST` is true (but `$SSL_NATIVE` is false), then OpenSSL is used whenever it supports at least one cipher from the cipherlist, and `tls_sockets()` (or `sslv2_sockets()`) is only used when OpenSSL doesn't support any ciphers from the cipherlist.
This PR changes `run_ssl_poodle()` to use sockets. This PR is particularly useful when $OPENSSL is OpenSSL 1.1.0, since OpenSS 1.1.0 does not support SSLv3 by default. But, it is also useful if $OPENSSL supports some, but not all, of the CBC ciphers.
As with `run_beast()`, there is a small change to `$cbc_cipher_list`. The following two ciphers were added:
```
0x00,0x0B - EXP-DH-DSS-DES-CBC-SHA SSLv3 Kx=DH/DSS Au=DH Enc=DES(40) Mac=SHA1 export
0x00,0x0E - EXP-DH-RSA-DES-CBC-SHA SSLv3 Kx=DH/RSA Au=DH Enc=DES(40) Mac=SHA1 export
```
The ciphers that were removed are all SSLv2 ciphers:
```
0x07,0x00,0xC0 - DES-CBC3-MD5 SSLv2 Kx=RSA Au=RSA Enc=3DES(168) Mac=MD5
0x06,0x00,0x40 - DES-CBC-MD5 SSLv2 Kx=RSA Au=RSA Enc=DES(56) Mac=MD5
0x04,0x00,0x80 - EXP-RC2-CBC-MD5 SSLv2 Kx=RSA(512) Au=RSA Enc=RC2(40) Mac=MD5 export
0x05,0x00,0x80 - IDEA-CBC-MD5 SSLv2 Kx=RSA Au=RSA Enc=IDEA(128) Mac=MD5
0x03,0x00,0x80 - RC2-CBC-MD5 SSLv2 Kx=RSA Au=RSA Enc=RC2(128) Mac=MD5
```
(EXP-RC2-CBC-MD5 is both an SSLv2 and an SSLv3 cipher. Previously it was listed twice in `$cbc_cipher_list`, now it appears once.)
In a few places testssl.sh tries to determine $OPENSSL s_client's capabilities by calling `$OPENSSL s_client` without specifying a host to which to connect. For example:
```
$OPENSSL s_client -no_ssl2 2>&1
```
This idea is that `$OPENSSL s_client` should reveal something about its capabilities without actually trying to connect to a host.
This works in most cases. However, the manual pages for s_client states:
```
-connect host:port
This specifies the host and optional port to connect to. If not specified then an attempt is made to connect to the local host on port 4433.
```
So, the above call is actually trying to connect to the local host on port 4433. If the local host is running `$OPENSSL s_server`, then `$OPENSSL s_server` will by default be listening on port 4433, and the connection attempt will most likely succeed. Since the `OPENSSL s_client` command does not include a `< /dev/null`, the `OPENSSL s_client` will just hang waiting for additional input.
Adding `-connect x` to the `$OPENSSL s_client` prevents $OPENSSL from trying to connect to a host, but seems to still provide the necessary information about OpenSSL's capabilities.
This PR adds ",exp" to the bits column when `run_rc4()` is run in the "--wide" mode and the cipher is an export cipher. This makes the wide mode of `run_rc4()` align with other functions, such as `run_allciphers()`.
