Tighten up all of the call sites of hx509_request_get_san()
to free the output string returned upon failure.
Use frees(&s) instead of free(s); s = NULL;.
Change-Id: I71035d7c1d2330a1a3a1b3b730cdd6ba1e6b7da3
This adds support for using a Heimdal-specific PKIX extension to derive
a maximum Kerberos ticket lifetime from a client's PKINIT certificate:
- a `--pkinit-max-life` to the `hxtool ca` command
- `hx509_ca_tbs_set_pkinit_max_life()`
- `hx509_cert_get_pkinit_max_life()`
- `HX509_CA_TEMPLATE_PKINIT_MAX_LIFE`
There are two extensions. One is an EKU, which if present means that
the maximum ticket lifetime should be derived from the notAfter minus
notBefore. The other is a certificate extension whose value is a
maximum ticket lifetime in seconds. The latter is preferred.
We need to revisit a lot of code in lib/hx509/, lib/krb5/, and kdc/ now
that the ASN.1 compiler properly handles IMPLICIT tagging. And we
should take advantage of automatic open type handling.
Add a `lifetime=NUMunit` query parameter.
Also add a krb5.conf parameter to indicate whether this is allowed.
We already have a max lifetime configuration parameter.
Status:
- And it works!
- We have an extensive test based on decoding a rich EK certficate.
This test exercises all of:
- decoding
- encoding with and without decoded open types
- copying of decoded values with decoded open types
- freeing of decoded values with decoded open types
Valgrind finds no memory errors.
- Added a manual page for the compiler.
- rfc2459.asn1 now has all three primary PKIX types that we care about
defined as in RFC5912, with IOS constraints and parameterization:
- `Extension` (embeds open type in an `OCTET STRING`)
- `OtherName` (embeds open type in an `ANY`-like type)
- `SingleAttribute` (embeds open type in an `ANY`-like type)
- `AttributeSet` (embeds open type in a `SET OF ANY`-like type)
All of these use OIDs as the open type type ID field, but integer
open type type ID fields are also supported (and needed, for
Kerberos).
That will cover every typed hole pattern in all our ASN.1 modules.
With this we'll be able to automatically and recursively decode
through all subject DN attributes even when the subject DN is a
directoryName SAN, and subjectDirectoryAttributes, and all
extensions, and all SANs, and all authorization-data elements, and
PA-data, and...
We're not really using `SingleAttribute` and `AttributeSet` yet
because various changes are needed in `lib/hx509` for that.
- `asn1_compile` builds and recognizes the subset of X.681/682/683 that
we need for, and now use in, rfc2459.asn1. It builds the necessary
AST, generates the correct C types, and generates templating for
object sets and open types!
- See READMEs for details.
- Codegen backend not tested; I won't make it implement automatic open
type handling, but it should at least not crash by substituting
`heim_any` for open types not embedded in `OCTET STRING`.
- We're _really_ starting to have problems with the ITU-T ASN.1
grammar and our version of it...
Type names have to start with upper-case, value names with
lower-case, but it's not enough to disambiguate.
The fact the we've allowed value and type names to violate their
respective start-with case rules is causing us trouble now that we're
adding grammar from X.681/682/683, and we're going to have to undo
that.
In preparation for that I'm capitalizing the `heim_any` and
`heim_any_set` types, and doing some additional cleanup, which
requires changes to other parts of Heimdal (all in this same commit
for now).
Problems we have because of this:
- We cannot IMPORT values into modules because we have no idea if a
symbol being imported refers to a value or a type because the only
clue we would have is the symbol's name, so we assume IMPORTed
symbols are for types.
This means we can't import OIDs, for example, which is super
annoying.
One thing we might be able to do here is mark imported symbols as
being of an undetermined-but-not-undefined type, then coerce the
symbol's type the first time it's used in a context where its type
is inferred as type, value, object, object set, or class. (Though
since we don't generate C symbols for objects or classes, we won't
be able to import them, especially since we need to know them at
compile time and cannot defer their handling to link- or
run-time.)
- The `NULL` type name, and the `NULL` value name now cause two
reduce/reduce conflicts via the `FieldSetting` production.
- Various shift/reduce conflicts involving `NULL` values in
non-top-level contexts (in constraints, for example).
- Currently I have a bug where to disambiguate the grammar I have a
CLASS_IDENTIFIER token that is all caps, while TYPE_IDENTIFIER must
start with a capital but not be all caps, but this breaks Kerberos
since all its types are all capitalized -- oof!
To fix this I made it so class names have to be all caps and
start with an underscore (ick).
TBD:
- Check all the XXX comments and address them
- Apply this treatment to Kerberos! Automatic handling of authz-data
sounds useful :)
- Apply this treatment to PKCS#10 (CSRs) and other ASN.1 modules too.
- Replace various bits of code in `lib/hx509/` with uses of this
feature.
- Add JER.
- Enhance `hxtool` and `asn1_print`.
Getting there!
Now that the ASN.1 compiler properly supports IMPLICIT tagging of named
CHOICE types (meaning: treat them as EXPLICIT tags), we can remove one
workaround for that.
This adds hx509 API and hxtool(1) support for PermanentIdentifier,
HardwareModuleName, and DNSSRV SAN types, as well as for serialNumber,
TPMManufacturer, TPMModel, and TPMVersion DN attributes.
This commit adds a few functions for marking KU, EKUs, and SANs as
authorized, and for getting a count of unsupported certificate
extensions requested, and a count of authorized KU/EKUs/SANs.
The intent is to make it easier to build CSR authorization and CA code
that is robust in the face of future support for certificate extensions
and SAN types not currently supported. An application could parse a
CSR, iterate all KU/EKUs/SANs, check a subject's authorization to them,
mark them authorized where authorized, then check if there are any
remaining unauthorized extensions or unsupported extensions requested.
Ultimately, if a CSR's KU/EKUs/SANs are all authorized, then they can
all be copied to a TBS, and a certificate can be issued.
This is necessary in order to add proper support for CSRs in kx509,
where the KDC can examine all requested KUs/EKUs/SANs, check
authorization, and issue a certificate with all those extensions if
authorized.
This is the convention used by OpenSSL, of encoding all the KU, EKUs,
and SANs being requested as Extensions as they would appear in the
TBSCertificate, then putting those in as a single Attribute in the CSR's
Attributes list with attribute OID {id-pkcs-9, 14}.
- expose all hx509_request_*() functions
- finish support in hx509_request_parse*() for KU, EKU, and SAN CSR
attributes
- finish support in hx509_request_to_pkcs10() for encoding all
requested KU, EKU, and SAN extensions as a CSR extReq (extension request)
- add hx509_request_add_*() support for:
- id-pkinit-san and ms-upn-pkinit-san
- XMPP (Jabber) SAN
- registeredID (useless but trivial)
- add hxtool request-create options for all supported SANs
- add hxtool request-create options for KeyUsage
- add hxtool request-create options for ExtKeyUsage
- add hxtool request-print support for all these things
- fix bugs in existing id-pkinit-san handling
Possible future improvements
- add HX509_TRACE env var and support (it would be nice to be able to
observe why some certificate is rejected, or not matched in a query)
- add testing that CSR creating and printing round-trip for all KUs,
EKUs, and SANs
(probably in tests/kdc/check-pkinit.in)
- add testing that OpenSSL can print a CSR made by hxtool and
vice-versa
- hxtool ca: add KU sanity checking (via hx509_ca_sign() and/or friends)
(don't allow encrypt for signing-only algs)
(don't allow encrypt for RSA at all, or for RSA with small e exponents)
- hxtool request-print: warn about all unknown attributes and
extensions
- hxtool ca: MAYBE add support for adding requested extensions from the
--req=CSR
("Maybe" because CA operators should really verify and authorize all
requested attributes, and should acknowledge that they have, and the
simplest way to do this is to make them add all the corresponding
CLI arguments to the hxtool ca command, but too, that is
error-prone, thus it's not clear yet which approach is best.
Perhaps interactively prompt for yes/no for each attribute.)
- add additional SAN types:
- iPAddress (useless?)
- dNSSrv (useful!)
- directoryName (useless, but trivial)
- uniformResourceIdentifier (useful)
- it would be nice if the ASN.1 compiler could generate print
functions..., and/or even better, to-JSON functions
- it would be nice if we had a known-OID db, including the names of the
types they refer to in certificate extensions, otherName SANs and CSR
attributes, then we could generate a CSR and certificate printer for
all known options even when they are not supported by the rest of
Heimdal
- and we could also get friendly names for OIDs, and we could
resolve their arc names
- longer term, we could also stand to add some ASN.1 information
object system functionality, just enough to make
lib/hx509/asn1_print awesome by being able to automatically decode
all heim_any and OCTET STRING content (better than its current
--inner option)
This is necessary in order to have more control over, e.g., template
certificates for kx509. But also it's good to have this more generally.
Some batteries not included. Specifically: no attempt is made to validate that
given KeyUsage values are compatible with the subjectPublicKey's alrogithm and
parameters.
libhx509 is not built according to the same export and calling conventions
on Windows as the other libraries. This change declares and applies
HX509_LIB_FUNCTION, HX509_LIB_NORETURN_FUNCTION, HX509_LIB_CALL and
HX509_LIB_VARIABLE to lib/hx509.
As a result of this change the calling convention for exported functions
will be __stdcall instead of __cdecl.
Change-Id: Ibc3f05e8088030ef7d13798f1d9c9b190bc57797
We turn on a few extra warnings and fix the fallout that occurs
when building with --enable-developer. Note that we get different
warnings on different machines and so this will be a work in
progress. So far, we have built on NetBSD/amd64 5.99.64 (which
uses gcc 4.5.3) and Ubuntu 10.04.3 LTS (which uses gcc 4.4.3).
Notably, we fixed
1. a lot of missing structure initialisers,
2. unchecked return values for functions that glibc
marks as __attribute__((warn-unused-result)),
3. made minor modifications to slc and asn1_compile
which can generate code which generates warnings,
and
4. a few stragglers here and there.
We turned off the extended warnings for many programs in appl/ as
they are nearing the end of their useful lifetime, e.g. rsh, rcp,
popper, ftp and telnet.
Interestingly, glibc's strncmp() macro needed to be worked around
whereas the function calls did not.
We have not yet tried this on 32 bit platforms, so there will be
a few more warnings when we do.
