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Split setgid and setuid, add privilege check 

This commit deals with issue #884. I consulted the following sources:
https://www.securecoding.cert.org/confluence/display/c/POS36-C.+Observe+correct+revocation+order+while+relinquishing+privileges
and
https://www.securecoding.cert.org/confluence/display/c/POS37-C.+Ensure+that+privilege+relinquishment+is+successful
This commit is contained in:
D.B 2016-09-20 15:49:16 +02:00
parent d98c26d0ed
commit 5e585f9603
1 changed files with 9 additions and 1 deletions
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10
sway/main.c
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@ -156,10 +156,18 @@ int main(int argc, char **argv) {
exit(EXIT_FAILURE);
}
if (getuid() != geteuid() || getgid() != getegid()) {
if (setgid(getgid()) != 0 || setuid(getuid()) != 0) {
if (setgid(getgid()) != 0) {
sway_log(L_ERROR, "Unable to drop root");
exit(EXIT_FAILURE);
}
if (setuid(getuid()) != 0) {
sway_log(L_ERROR, "Unable to drop root");
exit(EXIT_FAILURE);
}
}
if (setuid(0) != -1) {
sway_log(L_ERROR, "Root privileges can be restored.");
exit(EXIT_FAILURE);
}
char *socket_path = getenv("SWAYSOCK");
if (!socket_path) {