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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/util/set_eugid.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/set_eugid.c')
-rw-r--r--src/util/set_eugid.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/src/util/set_eugid.c b/src/util/set_eugid.c
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+/*++
+/* NAME
+/* set_eugid 3
+/* SUMMARY
+/* set effective user and group attributes
+/* SYNOPSIS
+/* #include <set_eugid.h>
+/*
+/* void set_eugid(euid, egid)
+/* uid_t euid;
+/* gid_t egid;
+/*
+/* void SAVE_AND_SET_EUGID(uid, gid)
+/* uid_t uid;
+/* gid_t gid;
+/*
+/* void RESTORE_SAVED_EUGID()
+/* DESCRIPTION
+/* set_eugid() sets the effective user and group process attributes
+/* and updates the process group access list to be just the specified
+/* effective group id.
+/*
+/* SAVE_AND_SET_EUGID() opens a block that executes with the
+/* specified privilege. RESTORE_SAVED_EUGID() closes the block.
+/* DIAGNOSTICS
+/* All system call errors are fatal.
+/* SEE ALSO
+/* seteuid(2), setegid(2), setgroups(2)
+/* 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 <unistd.h>
+#include <grp.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "set_eugid.h"
+
+/* set_eugid - set effective user and group attributes */
+
+void set_eugid(uid_t euid, gid_t egid)
+{
+ int saved_errno = errno;
+
+ if (geteuid() != 0)
+ if (seteuid(0))
+ msg_fatal("set_eugid: seteuid(0): %m");
+ if (setegid(egid) < 0)
+ msg_fatal("set_eugid: setegid(%ld): %m", (long) egid);
+ if (setgroups(1, &egid) < 0)
+ msg_fatal("set_eugid: setgroups(%ld): %m", (long) egid);
+ if (euid != 0 && seteuid(euid) < 0)
+ msg_fatal("set_eugid: seteuid(%ld): %m", (long) euid);
+ if (msg_verbose)
+ msg_info("set_eugid: euid %ld egid %ld", (long) euid, (long) egid);
+ errno = saved_errno;
+}