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realloc can return NULL in one of two cases - (1) the realloc failed,
(2) realloc succeeded but the new size requested was zero, in which
case this is identical to a free() call.
The error paths dealing with these two cases should be different,
but mostly weren't. Secondly the standard idiom for dealing with
realloc when you know the new size is non-zero is the following :
tmp = realloc(p, size);
if (!tmp) {
SAFE_FREE(p);
return error;
} else {
p = tmp;
}
However, there were *many* *many* places in Samba where we were
using the old (broken) idiom of :
p = realloc(p, size)
if (!p) {
return error;
}
which will leak the memory pointed to by p on realloc fail.
This commit (hopefully) fixes all these cases by moving to
a standard idiom of :
p = SMB_REALLOC(p, size)
if (!p) {
return error;
}
Where if the realloc returns null due to the realloc failing
or size == 0 we *guarentee* that the storage pointed to by p
has been freed. This allows me to remove a lot of code that
was dealing with the standard (more verbose) method that required
a tmp pointer. This is almost always what you want. When a
realloc fails you never usually want the old memory, you
want to free it and get into your error processing asap.
For the 11 remaining cases where we really do need to keep the
old pointer I have invented the new macro SMB_REALLOC_KEEP_OLD_ON_ERROR,
which can be used as follows :
tmp = SMB_REALLOC_KEEP_OLD_ON_ERROR(p, size);
if (!tmp) {
SAFE_FREE(p);
return error;
} else {
p = tmp;
}
SMB_REALLOC_KEEP_OLD_ON_ERROR guarentees never to free the
pointer p, even on size == 0 or realloc fail. All this is
done by a hidden extra argument to Realloc(), BOOL free_old_on_error
which is set appropriately by the SMB_REALLOC and SMB_REALLOC_KEEP_OLD_ON_ERROR
macros (and their array counterparts).
It remains to be seen what this will do to our Coverity bug count :-).
Jeremy.
(This used to be commit 1d710d06a214f3f1740e80e0bffd6aab44aac2b0)
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Volker
(This used to be commit bb40e544de68f01a6e774753f508e69373b39899)
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* remove pdb_context data structure
* set default group for DOMAIN_RID_GUEST user as RID 513 (just
like Windows)
* Allow RID 513 to resolve to always resolve to a name
* Remove auto mapping of guest account primary group given the
previous 2 changes
(This used to be commit 7a2da5f0cc05c1920c664c9a690a23bdf854e285)
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Sync with trunk as off r13315
(This used to be commit 17e63ac4ed8325c0d44fe62b2442449f3298559f)
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Jeremy, there's a #ifdef'ed 0 call to this in your usershare code. We need to
talk about what exactly what you intend to do here and in what scenarios.
Volker
(This used to be commit 95094ef758089cfc62700509d45b53bc0980654d)
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x86_64 box.
Jeremy.
(This used to be commit d720867a788c735e56d53d63265255830ec21208)
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is the
change in pdb_enum_alias_memberships to match samr.idl a bit closer.
Volker
(This used to be commit 3a6786516957d9f67af6d53a3167c88aa272972f)
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(This used to be commit 8c35c3bf2ed65d2b93feb0f419e1c7785fba7764)
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allocation
functions so we can funnel through some well known functions. Should help greatly with
malloc checking.
HEAD patch to follow.
Jeremy.
(This used to be commit 620f2e608f70ba92f032720c031283d295c5c06a)
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abartlet, I'd like to ask you to take a severe look at this!
We have solved the problem to find the global groups a user is in twice: Once
in auth_util.c and another time for the corresponding samr call. The attached
patch unifies these and sends them through the passdb backend (new function
pdb_enum_group_memberships). Thus it gives pdb_ldap.c the chance to further
optimize the corresponding call if the samba and posix accounts are unified by
issuing a specialized ldap query.
The parameter to activate this ldapsam behaviour is
ldapsam:trusted = yes
Volker
(This used to be commit b94838aff1a009f8d8c2c3efd48756a5b8f3f989)
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gids using the wrong array size
(This used to be commit 3003769164ed1265f57504f240e56f4a4ba34550)
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remove_duplicate_gids() to smbd and winbindd
(This used to be commit 95c68103ea9dbd02651e26fcaa15dd054b157529)
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unconditionally; bug 550
(This used to be commit 9df3f53e6ae751d522c7ac21deb785f1fa05f225)
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* remove idmap_XX_to_XX calls from smbd. Move back to the
the winbind_XXX and local_XXX calls used in 2.2
* all uid/gid allocation must involve winbindd now
* move flags field around in winbindd_request struct
* add WBFLAG_QUERY_ONLY option to winbindd_sid_to_[ug]id()
to prevent automatic allocation for unknown SIDs
* add 'winbind trusted domains only' parameter to force a domain member
server to use matching users names from /etc/passwd for its domain
(needed for domain member of a Samba domain)
* rename 'idmap only' to 'enable rid algorithm' for better clarity
(defaults to "yes")
code has been tested on
* domain member of native mode 2k domain
* ads domain member of native mode 2k domain
* domain member of NT4 domain
* domain member of Samba domain
* Samba PDC running winbindd with trusts
Logons tested using 2k clients and smbclient as domain users
and trusted users. Tested both 'winbind trusted domains only = [yes|no]'
This will be a long week of changes. The next item on the list is
winbindd_passdb.c & machine trust accounts not in /etc/passwd (done
via winbindd_passdb)
(This used to be commit 8266dffab4aedba12a33289ff32880037ce950a8)
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we now have to check the value for _NO_WINBINDD.
"1" enables, and != "1" disables (use "0" by convention).
(This used to be commit 11eccaef1dc61d80a7db8d0fb4bc5a47d71a4390)
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to handle domain trusts. Jeremy and I talked about this
and it's going in as working code. It keeps winbind clean
and solves the trust problem with minimal changes.
To summarize, there are 2 basic cases where the deadlock would
occur. (1) lookuping up secondary groups for a user, and
(2) get[gr|pw]nam() calls that fall through the NSS layer because
they don't exist anywhere.
o To handle case #1, we bypass winbindd in sys_getgrouplist() unless
the username includes the 'winbind separator'.
o Case #2 is handled by adding checks in winbindd to return failure
if we are a DC and the domain matches our own.
This code has been tested using basic share connections, domain
logons, and with pam_winbind (both with and without 'winbind
use default domain'). The 'trustdomain' auth module should work
as well if an admin wants to manually create UNIX users for
acounts in the trusted domains.
Other misc fixes:
* we need to fix check_ntlm_password() to be able to determine
if an auth module is authoritative over a user (NT_STATUS_WRONG_PASSWORD,
etc...). I worked around my specific situation, but this needs to be
fixed. the winbindd auth module was causing delays.
* fix named server mutex deadlock between trust domain auth module
and winbindd looking up a uid
* make sure SAM_ACCOUNT gets stored in the server_info struct for the
_net_sam_logon() reply.
Configuration details:
The recommended method for supporting trusts is to use winbind.
The gets us around some of the server mutex issues as well.
* set 'files winbind' for passwd: and group: in /etc/nsswitch.conf
* create domain trusts like normal
* join winbind on the pdc to the Samba domain using 'net rpc join'
* add normal parameters to smb.conf for winbind
* set 'auth method = guest sam winbind'
* start smbd, nmbd, & winbindd
Problems that remain:
* join a Windows 2k/XP box to a Samba domain.
* create a 2-way trust between the Samba domain
and an NT domain
* logon to the windows client as a user from theh trusted
domain
* try to browse server in the trusted domain (or other
workstations). an NT client seems to work ok, but 2k
and XP either prompt for passwords or fail with errors.
apparanently this never got tested since no one has ever been
able to logon as a trusted user to a Samba domain from a Windows
client.
(This used to be commit f804b590f9dbf1f0147c06a0a2f12e221ae6fc3b)
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- setenv() replacement
- mimir's ASN1/SPNEGO typo fixes
- (size_t)-1 fixes for push_* returns
- function argument signed/unsigned correction
- ASN1 error handling (ensure we don't use initiailsed data)
- extra net ads join error checking
- allow 'set security discriptor' to fail
- escape ldap strings in libads.
- getgrouplist() correctness fixes (include primary gid)
Andrew Bartlett
(This used to be commit e9d6e2ea9a3dc01d3849b925c50702cda6ddf225)
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(This used to be commit 65e7b5273bb58802bf0c389b77f7fcae0a1f6139)
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'system_smbd.c' file, where it can link with become_root() and unbecome_root(),
and therefore avoiding some nasty 'it workes on linux' bugs.
(The replacement function is implemented in terms of initgroups(), which is
naturally only avaliable to root).
Andrew Bartlett
(This used to be commit a91018dd026be3db473bb1cf1f4981295f9758e4)
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