diff options
Diffstat (limited to 'src/util/lstat_as.c')
| -rw-r--r-- | src/util/lstat_as.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/util/lstat_as.c b/src/util/lstat_as.c new file mode 100644 index 0000000..18e0f9f --- /dev/null +++ b/src/util/lstat_as.c @@ -0,0 +1,73 @@ +/*++ +/* NAME +/* lstat_as 3 +/* SUMMARY +/* lstat file as user +/* SYNOPSIS +/* #include <sys/stat.h> +/* #include <lstat_as.h> +/* +/* int lstat_as(path, st, euid, egid) +/* const char *path; +/* struct stat *st; +/* uid_t euid; +/* gid_t egid; +/* DESCRIPTION +/* lstat_as() looks up the file status of the named \fIpath\fR, +/* using the effective rights specified by \fIeuid\fR +/* and \fIegid\fR, and stores the result into the structure pointed +/* to by \fIst\fR. A -1 result means the lookup failed. +/* This call does not follow symbolic links. +/* DIAGNOSTICS +/* Fatal error: no permission to change privilege level. +/* SEE ALSO +/* set_eugid(3) switch effective rights +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <sys/stat.h> +#include <unistd.h> + +/* Utility library. */ + +#include "msg.h" +#include "set_eugid.h" +#include "lstat_as.h" +#include "warn_stat.h" + +/* lstat_as - lstat file as user */ + +int lstat_as(const char *path, struct stat * st, uid_t euid, gid_t egid) +{ + uid_t saved_euid = geteuid(); + gid_t saved_egid = getegid(); + int status; + + /* + * Switch to the target user privileges. + */ + set_eugid(euid, egid); + + /* + * Lstat that file. + */ + status = lstat(path, st); + + /* + * Restore saved privileges. + */ + set_eugid(saved_euid, saved_egid); + + return (status); +} |