In the check for old versions of OpenSSL, the results of the call to `ignore_no_or_lame()` are ignored, and so the program continues even if the user enters `no`.
This PR makes three changes to `determine_optimal_proto()`:
* It no longer tries an empty string for `$OPTIMAL_PROTO` twice.
* It does not include `-servername` for `-ssl2` or `-ssl3`, since some versions of OpenSSL that support SSLv2 will fail if `s_client` is provided both the `-ssl2` and `-servername` options.
* It displays a warning if `$OPTIMAL_PROTO` is `-ssl2`, since some tests in testssl.sh will not work correctly for SSLv2-only servers.
This PR addresses two issues related to SSLv2 for "--server-preference" checks.
First, some versions of OpenSSL that support SSLv2 will fail if `s_client` is provided both the `-ssl2` and `-servername` options.
Second, the line for extracting the chosen cipher,`cipher=$(awk '/Cipher.*:/ { print $3 }' $TMPFILE)`, fails for SSLv2. For SSLv2, the output from `$OPENSSL s_client` is as shown below, and the `cipher=` line extracts the word `between` from `Ciphers common between both SSL endpoints:` rather than `IDEA-CBC-MD5` from ` Cipher : IDEA-CBC-MD5`.
```
...
Ciphers common between both SSL endpoints:
RC4-MD5 RC2-CBC-MD5 IDEA-CBC-MD5
DES-CBC-MD5 DES-CBC3-MD5
---
SSL handshake has read 1191 bytes and written 373 bytes
---
New, SSLv2, Cipher is IDEA-CBC-MD5
Server public key is 2048 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
Protocol : SSLv2
Cipher : IDEA-CBC-MD5
...
```
This PR changes test_just_one() to correctly handle SSLv2 ciphers.
As with PR #424, this PR addresses the problem in which servers that do not implement SSLv2, but that implement RC4-MD5, EXP-RC2-CBC-MD5, EXP-RC4-MD5, or NULL-MD5 are shown as implementing both the SSLv2 and SSLv3 versions of the ciphers, and that any SSLv2 ciphers that a server does implement are not shown as being implemented.
This PR changes run_rc4() to correctly handle SSLv2 ciphers.
It addresses the problem in which servers that do not implement SSLv2, but that implement SSLv3 ciphers that share an OpenSSL name with an SSLv2 cipher (RC4-MD5 and EXP-RC4-MD5), are not incorrectly shown as having implemented the SSLv2 cipher.
It also addresses the problem that if a server does implement SSLv2 with an RC4 SSLv2-cipher suite, then that cipher suite it not shown as being implemented.
`certificate_info()` does not correctly display the Issuer name for CAs that use domain component attributes.
There is a server on the NIST intra-net that I test against that has a certificate issued by a NIST CA, and the issuer name in the certificate is of the form: `/DC=net/DC=example/DC=internal/CN=CAname`
Since there is no organizational name, testssl.sh displays the name as:
```
Issuer "CAname" ("")
```
In this PR, if the Issuer name has 'DC=' attributes, but does not have an 'O=' attribute, the "DC=" attributes are combined into a DNS name that is used as if it were the organizational name:
```
Issuer "CAname" ("internal.example.net")
```
I should note, however, that I have not been able to find any other examples of TLS server certificates that have been issued by CAs that have domain components ("DC=") in their names. So, it may not be worthwhile to change the code to try to accommodate such CAs.
`certificate_info()` currently outputs `$issuer` to the JSON file, where is should be outputting `$issuer_CN` in order for the information in the JSON file to match the information that is displayed.
This PR also fixes the problem that if an Issuer name contains a domain component attribute (DC=) then it will be mistakenly treated as a country attribute (C=).
Rather than try each curve one at a time, follow model in `cipher_pref_check()`. First include all curves in ClientHello, then successively remove from the ClientHello those curves that have been offered by the server until the connection fails. This makes the number of calls to `$OPENSSL s_client` one more than the number of supported curves rather than the number of curves in NamedCurve supported by $OPENSSL.
Note, however, that OpenSSL defines MAX_CURVELIST as 28 and fails if the `-curves` option includes more than 28 curves. Since OpenSSL 1.1.0 offers 29 curves from NamedCurve, this PR breaks the list of supported curves in 2. At the cost of one additional calls to `$OPENSSL s_client` it ensures that the number of curves provides to the `-curves` option is below the limit.
This PR should address issue #399.
I created the list of ciphers using the CIPHERS_BY_STRENGTH file from PR #373, making a list of all ciphers that had "CBC" in the RFC name and for which I had been able to find a corresponding OpenSSL name. Then, since that list contained more than 128 ciphers, I removed any ciphers from the list where the name ended in "-SHA256" or "-SHA384", as it is my understanding that those ciphers can only be used with TLS 1.2.
Changed code for run_client_simulation() so that cipher is output when sockets are used even if $MAPPING_FILE_RFC is missing. Also, updated the client data.
Modify run_client_simulation() to send the ClientHello from https://api.dev.ssllabs.com/api/v3/getClients (modified to use the correct value in the server name extension) if $EXPERIMENTAL is true, $STARTTLS is empty, and $SSL_NATIVE is false.
While it seems that almost all certificates include a subjectAltName extension, need to allow for the possibility that the two certificates being compared don't have subjectAltName extensions.
When run_rc4() is run with the "--show-each" option, but without the "--wide" option, a list of all RC4 ciphers is printed, without any distinction between those that are supported by the server and those that are not. This is the same issue I noted in #332 for run_pfs().
In run_pfs(), the displayed output was corrected, but all ciphers were still being added to $pfs_ciphers, so the list of supported PFS ciphers sent to fileout() was incorrect.
This PR fixes both issues.
When certificate_info() is trying to determine what type of public key the server has so that it can determine whether the key size is acceptable, it sometimes looks at $cert_sig_algo rather than $cert_key_algo. This PR fixes that and also adds support for DSA public keys.
The dec2hex() was actually converting from hex to decimal. Since it was only being used in one place, and wasn't really needed there, I just deleted it.
Revised parse_tls_serverhello() to more carefully check the response for errors, and to provide for more flexibility (e.g., if handshake messages are split across multiple fragments).
The new test in PR #346 sends a TLSv1.4 ClientHello, so socksend_tls_clienthello() needs to include the signature algorithms extension if $tls_low_byte >= 3 rather than only if it is equal to 3.
One server I am testing responds to an SSLv3 ClientHello with TLSv1.2. If tls_sockets is being used, then testssl.sh responds with "#FIXME: downgraded. still missing a test case here." This PR fixes that, and in general checks the responses in run_protocols() more closely.
If tls_sockets is being used and the connection fails even though the server supports an earlier version of SSL/TLS, then it flags an error. If tls_sockets returns 2, then it verifies that $DETECTED_TLS_VERSION is equal to the highest version number supported by the server (that is also less than the version number in the ClientHello).
In addition, in order to test servers' support for version negotiation, it adds a new test that sends a TLSv1.4 ClientHello and verifies that the server responds with the highest version number that it supports. (This test only runs if both $using_sockets and $EXPERIMENTAL are true and server actually supports some version of SSL/TLS other than SSLv2.)
Changed to only include the signature algorithms extension for TLSv1.2, since RFC 5246 says:
Note: this extension is not meaningful for TLS versions prior to 1.2.
Clients MUST NOT offer it if they are offering prior versions.
However, even if clients do offer it, the rules specified in [TLSEXT]
require servers to ignore extensions they do not understand.
Inclusion of the extension for TLS 1.1 didn't seem to cause any harm, but it seems better to follow the RFC and not include it for TLSv1.0 or TLSv1.1.
RFC 7685 notes that there is at least one TLS implementation that hangs if the client sends a ClientHello with a TLSCiphertext.length between 256 and 511 bytes, and so the padding extension was defined in order to get around this bug. (OpenSSL s_client includes this extension when the -bugs option is used.) So, I changed socksend_tls_clienthello() to include the padding extension if the CLientHello would have a length between 256 and 511 bytes, making the padding extension just large enough to make the ClientHello 512 bytes.
I also fixed a typo (a missing "0x") in the check for whether any ECC ciphers are included in the Client Hello.
Versions of OpenSSL prior to 1.1.0 ignore the options "-tls1_1" and "-tls1_2". So, a call of the form "$OPENSSL ciphers -tls1_2 -V 'ALL:COMPLEMENTOFALL:@STRENGTH' would list all supported ciphers (including SSLv2 ciphers), not just ciphers appropriate for TLS1.2.
This changes the code to use "-tls1" instead of "-tls1_1" or "-tls1_2" if a version of OpenSSL other than 1.1.0 is being used.
I changed the code to use the global $HAS_SSL2 rather than $sslv2_locally_supported.
I don't think there's a need to use $HAS_SSL3 in run_allciphers(), since the call to "$OPENSSL s_client" for non-SSLv2 ciphers does not specify a protocol. It's also not needed in run_cipher_per_proto(), since there is already a call to locally_supported() before anything further is done with a protocol.
David Cooper