[INI] Ding-libs, controversial points in the design to allow merging configuration snippets
by Dmitri Pal
Hello,
This is the continuation of the discussion of the following design page:
https://fedorahosted.org/sssd/wiki/DesignDocs/ding-libs/INIConfigMerge
I see three controversial items in this design based on the previous
discussion:
a) Merging values
This horse has been beaten in the other thread.
The answer is simple. If we can make SSSD to make a change to not use
lists or domains or providers as Simo suggest we can remove this
consideration from the merge design. If we can't then we need to make it
optionally available in the merge logic. To make a final decision here
we need Jakub's input on how hard it is to implement Simo's idea.
c) Snippets in a directory vs. snippets in a subdirectory per application.
The design is built around the fact that it is better to put snippets
into different subdirectories per source/application that updated them
so that we can make sure that different sources of config info do not
step on each other. We also can jail the config files with SELinux and
allow different access to different subdirectories. This is a deviation
from the current approaches where all snippets are supposed to go into a
single directory.
IMO this is quite limiting and I see an opportunity to change it for
better. However if people agree with Simo that this is too over
engineered and complicated I can understand. It is in fact more complex.
So chime in. If you think single directory is good enough so be it.
d) .merge files
I do not like them either.
If we:
a) Can avoid value merges
b) Will require each snippet to have a section header ( the problem is
really the fact that INI automatically generates one called "default" if
there is none so it is hard to say whether the parse filled the blank or
the snippet section really is called "[default]"). I think I can work
around it but it would require a change that I wanted to avoid with the
design.
c) Do not allow overwrites
we can drop the .merge files.
They are needed to support any of the three use cases above.
I am mostly concerned about the last one because allowing overwrites on
per section basis was something was requested in one of the RFEs.
However here is how we can work around this because IMO it is a corner case.
- The merge code will read snippets from a single directory.
- It will inspect the name. If the name is <xxx>.over.conf then it will
treat this file as the snippet that the author of the snippet wants to
use to overwrite sections in the original config file. If the name of
the file is <yyyy>.conf it will user it to do additive merge. If file
has any other extension it will be ignored.
Common rules about snippets:
- Snippets must have a section defined - absence will cause an error and
snippet will be ignored
- Snippets can't have the same section defined in more than one .conf
file. If same name is detected it will be treated as a collision and all
snippets will be ignored
Additional rules about <xxx>.over.conf:
- Snippets of this kind will be applied only on top of the core config
file and only if the application is running in the mode that allows such
overwrite.
- The overwrite will be done on the section by section basis, i.e. no
merging of the values between the two sections (though merge logic
supports this too)
- If there is more than one section in the file then each section will
be processed according to these rules
If we go with something like this we can avoid .merge files and rely on
the naming convention. Is this acceptable? I though not, this is why I
invented .merge files but if we think this way is better I am fine with it.
Next week I am traveling, I will have some time to do prototyping while
I am flying so I want to get to consensus before the end of the week.
--
Thank you,
Dmitri Pal
Sr. Engineering Manager IdM portfolio
Red Hat, Inc.
10 years
Use a shorter retry timeout for failed SRV
by Pavel Reichl
Hello,
please see attached patch.
While testing this patch I have noticed a little asymmetry:
While SSSD being offline I added SRV record so resolving could success:
Call of 'getent passwd user@ad-domain ' results in 'Cannot proceed,
provider is offline'.
but calling 'getent passwd user' will try to resolve services and ends
up online (then previous call will obviously succeed too).
Pavel Reichl
10 years
Announcing SSSD 1.11.5.1
by Jakub Hrozek
=== SSSD 1.11.5.1 ===
The SSSD team is proud to announce the release of version 1.11.5.1 of
the System Security Services Daemon.
As always, the source is available from https://fedorahosted.org/sssd
RPM packages will be made available for Fedora 19, 20 and rawhide shortly.
== Feedback ==
Please provide comments, bugs and other feedback via the sssd-devel
or sssd-users mailing lists:
https://lists.fedorahosted.org/mailman/listinfo/sssd-devel
https://lists.fedorahosted.org/mailman/listinfo/sssd-users
== Highlights ==
* Fixes an issue producing the systemd unit file while building from
the tarball.
* Fixes a regression that caused a segfault when connecting to a Samba 4
domain controller.
== Tickets Fixed ==
https://fedorahosted.org/sssd/ticket/2311
sssd crashes after upgrade from 1.11.4 to 1.11.5 when using a samba4
domain
https://fedorahosted.org/sssd/ticket/2314
sssd-1.11.5-1.fc20 has wrong systmd service file
== Detailed Changelog ==
Jakub Hrozek (3):
* Updating the version for the 1.11.6 release
* Setting the version to 1.11.5.1 for the release
* Updating the translations for the 1.11.5.1 release
Lukas Slebodnik (1):
* AUTOMAKE: Do not include makefile generated files into tarball
Stephen Gallagher (1):
* AD Provider: Fix crash looking up forest on Samba 4
10 years
[PATCH] AUTOMAKE: Do not include makefile generated files into
by Lukas Slebodnik
ehlo,
patches for master and 1-11 branchare attached.
Resolves:
https://fedorahosted.org/sssd/ticket/2314
how to test:
#generate tarball with "make distcheck"
#move tarball to another directory
#extract tarball
#change dir to sssd-$(VERSION)
./configure --with-initscript=systemd --prefix=/usr
make
# look into generated file src/sysv/systemd/sssd.service
./configure --with-initscript=systemd --prefix=/usr --exec-prefix=/usr/local
# do not run make clean
make
# look into generated file src/sysv/systemd/sssd.service
# it should be changed
LS
10 years
[PATCH] AD Provider: Fix crash looking up forest on Samba 4
by Stephen Gallagher
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We were assuming that the forest had been looked up by netlogon, but
this is not available on Samba 4 domains. We need to check that the
forest is NULL and force the lookup.
Resolves:
https://fedorahosted.org/sssd/ticket/2311
This is a regression in 1.11.5 when interacting with Samba 4 domain
controllers.
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10 years
having trouble linking with libsamba-security (but only sometimes)
by Yassir Elley
Hi all,
I have been using a samba function (string_to_sid) in my gpo code and have had no trouble so far compiling and linking my libsss_ad.so gpo code.
I simply needed to apply the following patches, which includes having to declare the string_to_sid function before it is used in the file.
--- /dev/null
+++ b/src/providers/ad/ad_gpo.c
@@ @@
+
+ bool string_to_sid(struct dom_sid *sidout, const char *sidstr);
+
--- a/Makefile.am
+++ b/Makefile.am
@@ @@ libsss_ad_la_SOURCES = \
src/providers/ad/ad_access.h \
+ src/providers/ad/ad_gpo.c \
+ src/providers/ad/ad_gpo.h \
src/providers/ad/ad_opts.h \
However, now that I'm creating a gpo unit test (using the same string_to_sid function), the linker fails with the following message:
/usr/bin/ld: src/tests/cmocka/ad_gpo_tests-test_ad_gpo.o: undefined reference to symbol 'string_to_sid@(a)SAMBA_4.1.5'
/usr/bin/ld: note: 'string_to_sid@(a)SAMBA_4.1.5' is defined in DSO /usr/lib64/samba/libsamba-security.so so try adding it to the linker command line
/usr/lib64/samba/libsamba-security.so: could not read symbols: Invalid operation
I applied the following patches to get ad_gpo_test.c, which allowed me to compile successfully, but the link failed with the above message.
--- a/Makefile.am
+++ b/Makefile.am
@@ @@ if HAVE_CMOCKA
ad_access_filter_tests \
+ ad_gpo_tests \
ad_common_tests \
@@ @@ ad_access_filter_tests_LDADD = \
+ad_gpo_tests_SOURCES = \
+ $(sssd_be_SOURCES) \
+ src/util/sss_ldap.c \
+ src/util/sss_krb5.c \
+ src/util/find_uid.c \
+ src/util/user_info_msg.c \
+ src/providers/ad/ad_common.c \
+ src/tests/cmocka/test_ad_gpo.c
+ad_gpo_tests_CFLAGS = \
+ $(AM_CFLAGS) \
+ $(SYSTEMD_LOGIN_CFLAGS) \
+ $(NDR_NBT_CFLAGS) \
+ -DUNIT_TESTING
+ad_gpo_tests_LDADD = \
+ $(PAM_LIBS) \
+ $(CMOCKA_LIBS) \
+ $(SSSD_LIBS) \
+ $(CARES_LIBS) \
+ $(KRB5_LIBS) \
+ $(SSSD_INTERNAL_LTLIBS) \
+ $(SYSTEMD_LOGIN_LIBS) \
+ $(NDR_NBT_LIBS) \
+ libsss_ldap_common.la \
+ libsss_idmap.la \
+ libsss_krb5_common.la \
+ libsss_ad.la \
+ libsss_test_common.la
+
ad_common_tests_SOURCES = \
If I apply the following patch, I am able to compile and link successfully!!:
--- a/Makefile.am
+++ b/Makefile.am
@@ -1625,7 +1625,10 @@ ad_gpo_tests_CFLAGS = \
$(SYSTEMD_LOGIN_CFLAGS) \
$(NDR_NBT_CFLAGS) \
-DUNIT_TESTING
+ad_gpo_tests_LDFLAGS = \
+ -rpath $(libdir)/samba
ad_gpo_tests_LDADD = \
+ $(libdir)/samba/libsamba-security.so \
$(PAM_LIBS) \
$(CMOCKA_LIBS) \
I am confused by a few things:
* Why do we need to explicitly add libsamba-security.so (and -rpath) to the linker line for the gpo tests, but not for libsss_ad.so
* The patch that allows the gpo_tests to link/compile might not be portable b/c it assumes that libsamba-security.so is in $(libdir)/samba for all distributions. Is that a valid assumption?
* One of the issues seems to be that the linker only looks in $(libdir) and $(libdir)/sssd, which is why adding the rpath works. Is this really the first time that we are using a library not in $(libdir) or $(libdir)/sssd. In other words, I would have expected this to have happened before (i.e. linking against a library not in the default locations).
* Presumably, the libsss_ad.so gpo code links successfully because it is pulling in a library (which is internally pulling in libsamba-security), but I'm not sure which library that is. Any ideas?
* Is there a better solution for getting the gpo tests to link?
Thanks,
Yassir.
10 years
SSSD ticket #2214
by Michal Židek
Hello,
I was looking at
https://fedorahosted.org/sssd/ticket/2214
I did not know about C being that paranoid with nested
pointers to const data when passed as function arguments (I
probably don't use const as often as I should, so I never bumped
into this problem before).
Good explanation on what the problem is can be found here:
http://c-faq.com/ansi/constmismatch.html
I have searched the web and read some materials on how to solve
this issue, but could not find any elegant solution that
would accept both 'char **' and 'const char **' without
warnings (if you know about some way, please tell me).
Than I tried to turn all the data that we pass as arguments 2 or
3 to these functions into 'const char**', but in many cases
it is not possible and we would have to cast them to const. This
spawns another warning during compilation:
warning: to be safe all intermediate pointers in cast from 'char **' to
'const char **' must be 'const' qualified
Which does not look good as well, so if nobody is against, I will
close the ticket as 'wontfix'.
Michal
10 years
