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Implemented supplementary group checks for OpenIndiana

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Checking supplementary groups permissions to access a file relies on
a supplementary group list available in /proc/PID. This patch adds a
variant to implement the checks based on the specific format used
by OpenIndiana.
This commit is contained in:
Jean-Pierre André 2012-03-21 18:34:48 +01:00
parent 66d30c86b3
commit f78cc45208
1 changed files with 79 additions and 1 deletions
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80
libntfs-3g/security.c
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@ -4,7 +4,7 @@
* Copyright (c) 2004 Anton Altaparmakov
* Copyright (c) 2005-2006 Szabolcs Szakacsits
* Copyright (c) 2006 Yura Pakhuchiy
* Copyright (c) 2007-2010 Jean-Pierre Andre
* Copyright (c) 2007-2012 Jean-Pierre Andre
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
@ -1129,10 +1129,86 @@ static BOOL staticgroupmember(struct SECURITY_CONTEXT *scx, uid_t uid, gid_t gid
return (ingroup);
}
#if defined(__sun) && defined (__SVR4)
/*
* Check whether current thread owner is member of file group
* Solaris/OpenIndiana version
* Should not be called for user root, however the group may be root
*
* The group list is available in "/proc/$PID/cred"
*
*/
static BOOL groupmember(struct SECURITY_CONTEXT *scx, uid_t uid, gid_t gid)
{
typedef struct prcred {
uid_t pr_euid; /* effective user id */
uid_t pr_ruid; /* real user id */
uid_t pr_suid; /* saved user id (from exec) */
gid_t pr_egid; /* effective group id */
gid_t pr_rgid; /* real group id */
gid_t pr_sgid; /* saved group id (from exec) */
int pr_ngroups; /* number of supplementary groups */
gid_t pr_groups[1]; /* array of supplementary groups */
} prcred_t;
enum { readset = 16 };
prcred_t basecreds;
gid_t groups[readset];
char filename[64];
int fd;
int k;
int cnt;
gid_t *p;
BOOL ismember;
int got;
pid_t tid;
if (scx->vol->secure_flags & (1 << SECURITY_STATICGRPS))
ismember = staticgroupmember(scx, uid, gid);
else {
ismember = FALSE; /* default return */
tid = scx->tid;
sprintf(filename,"/proc/%u/cred",tid);
fd = open(filename,O_RDONLY);
if (fd >= 0) {
got = read(fd, &basecreds, sizeof(prcred_t));
if (got == sizeof(prcred_t)) {
if (basecreds.pr_egid == gid)
ismember = TRUE;
p = basecreds.pr_groups;
cnt = 1;
k = 0;
while (!ismember
&& (k < basecreds.pr_ngroups)
&& (cnt > 0)
&& (*p != gid)) {
k++;
cnt--;
p++;
if (cnt <= 0) {
got = read(fd, groups,
readset*sizeof(gid_t));
cnt = got/sizeof(gid_t);
p = groups;
}
}
if ((cnt > 0)
&& (k < basecreds.pr_ngroups))
ismember = TRUE;
}
close(fd);
}
}
return (ismember);
}
#else /* defined(__sun) && defined (__SVR4) */
/*
* Check whether current thread owner is member of file group
* Linux version
* Should not be called for user root, however the group may be root
*
* As indicated by Miklos Szeredi :
@ -1235,6 +1311,8 @@ static BOOL groupmember(struct SECURITY_CONTEXT *scx, uid_t uid, gid_t gid)
return (ismember);
}
#endif /* defined(__sun) && defined (__SVR4) */
/*
* Cacheing is done two-way :
* - from uid, gid and perm to securid (CACHED_SECURID)