When multiple rounds are needed to establish a security context
(usually ntlm), we overwrite old token with a new one without free.
Found by proposed gss tests using stub a gss implementation (by
valgrind error), though I have confirmed the leak with a real
gssapi implementation as well.
Closes https://github.com/curl/curl/pull/1733
When the random seed is purposely made predictable for testing purposes
by using the CURL_ENTROPY environment variable, process that data in an
endian agnostic way so the the initial random seed is the same
regardless of endianness.
- Change Curl_rand to write to a char array instead of int array.
- Add Curl_rand_hex to write random hex characters to a buffer.
Fixes#1315Closes#1468
Co-authored-by: Daniel Stenberg
Reported-by: Michael Kaufmann
With -Og, GCC complains:
easy.c:628:7: error: ‘mcode’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
../lib/strcase.h:35:29: error: ‘tok_buf’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
vauth/digest.c:208:9: note: ‘tok_buf’ was declared here
../lib/strcase.h:35:29: error: ‘tok_buf’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
vauth/digest.c:566:15: note: ‘tok_buf’ was declared here
Fix this by initializing the variables.
- on the first invocation: keep security context returned by
InitializeSecurityContext()
- on subsequent invocations: use MakeSignature() instead of
InitializeSecurityContext() to generate HTTP digest response
Bug: https://github.com/curl/curl/issues/870
Reported-by: Andreas Roth
Closes https://github.com/curl/curl/pull/1251
Now Curl_rand() is made to fail if it cannot get the necessary random
level.
Changed the proto of Curl_rand() slightly to provide a number of ints at
once.
Moved out from vtls, since it isn't a TLS function and vtls provides
Curl_ssl_random() for this to use.
Discussion: https://curl.haxx.se/mail/lib-2016-11/0119.html
... to make it less likely that we forget that the function actually
does case insentive compares. Also replaced several invokes of the
function with a plain strcmp when case sensitivity is not an issue (like
comparing with "-").
As Windows SSPI authentication calls fail when a particular mechanism
isn't available, introduced these functions for DIGEST, NTLM, Kerberos 5
and Negotiate to allow both HTTP and SASL authentication the opportunity
to query support for a supported mechanism before selecting it.
For now each function returns TRUE to maintain compatability with the
existing code when called.
This is a follow up to the parent commit dcdd4be which fixes one leak
but creates another by failing to free the credentials handle if out of
memory. Also there's a second location a few lines down where we fail to
do same. This commit fixes both of those issues.
This wouldn't cause a problem because of the way the function is called,
but prior to this change, we were processing the challenge message when
the credentials were NULL rather than when the challenge message was
populated.
This also brings this part of the Kerberos 5 code in line with the
Negotiate code.
Although mutual authentication is currently turned off and can only be
enabled by changing libcurl source code, authentication using Kerberos
5 has been broken since commit 79543caf90 in this use case.
This wouldn't cause a problem because of the way the function is called,
but prior to this change, we were processing the challenge message when
the credentials were NULL rather than when the challenge message was
populated.
This also brings this part of the Kerberos 5 code in line with the
Negotiate code.
Prior to this change, we were generating the output token when the
credentials were NULL rather than when the output token was NULL.
This also brings this part of the Kerberos 5 code in line with the
Negotiate code.
Prior to this change, we were generating the SPN in the SSPI code when
the credentials were NULL and in the GSS-API code when the context was
empty. It is better to decouple the SPN generation from these checks
and only generate it when the SPN itself is NULL.
This also brings this part of the Kerberos 5 code in line with the
Negotiate code.
For consistency with the spnego and oauth2 code moved the setting of
the host name outside of the Curl_auth_create_gssapi_user_messag()
function.
This will allow us to more easily override it in the future.
Also display the GSS_C_GSS_CODE (major code) when specified instead of
only GSS_C_MECH_CODE (minor code).
In addition, the old code was printing a colon twice after the prefix
and also miscalculated the length of the buffer in between calls to
gss_display_status (the length of ": " was missing).
Also, gss_buffer is not guaranteed to be NULL terminated and thus need
to restrict reading by its length.
Closes#738
