1*fdd8201dSApple OSS Distributions #include <darwintest.h>
2*fdd8201dSApple OSS Distributions
3*fdd8201dSApple OSS Distributions #include <TargetConditionals.h>
4*fdd8201dSApple OSS Distributions #include <limits.h>
5*fdd8201dSApple OSS Distributions #include <stdio.h>
6*fdd8201dSApple OSS Distributions #include <stdlib.h>
7*fdd8201dSApple OSS Distributions #include <string.h>
8*fdd8201dSApple OSS Distributions #include <sys/errno.h>
9*fdd8201dSApple OSS Distributions #include <unistd.h>
10*fdd8201dSApple OSS Distributions
11*fdd8201dSApple OSS Distributions #if !TARGET_OS_OSX
12*fdd8201dSApple OSS Distributions #include <pwd.h>
13*fdd8201dSApple OSS Distributions #include <sys/types.h>
14*fdd8201dSApple OSS Distributions #include <uuid/uuid.h>
15*fdd8201dSApple OSS Distributions #endif
16*fdd8201dSApple OSS Distributions
17*fdd8201dSApple OSS Distributions #include "drop_priv.h"
18*fdd8201dSApple OSS Distributions
19*fdd8201dSApple OSS Distributions #if TARGET_OS_OSX
20*fdd8201dSApple OSS Distributions #define INVOKER_UID "SUDO_UID"
21*fdd8201dSApple OSS Distributions #define INVOKER_GID "SUDO_GID"
22*fdd8201dSApple OSS Distributions #define ID_MAX (unsigned long)UINT_MAX
23*fdd8201dSApple OSS Distributions static unsigned
_get_sudo_invoker(const char * var)24*fdd8201dSApple OSS Distributions _get_sudo_invoker(const char *var)
25*fdd8201dSApple OSS Distributions {
26*fdd8201dSApple OSS Distributions char *value_str = getenv(var);
27*fdd8201dSApple OSS Distributions T_QUIET; T_WITH_ERRNO; T_ASSERT_NOTNULL(value_str,
28*fdd8201dSApple OSS Distributions "Not running under sudo, getenv(\"%s\") failed", var);
29*fdd8201dSApple OSS Distributions T_QUIET; T_ASSERT_NE_CHAR(*value_str, '\0',
30*fdd8201dSApple OSS Distributions "getenv(\"%s\") returned an empty string", var);
31*fdd8201dSApple OSS Distributions
32*fdd8201dSApple OSS Distributions char *endp;
33*fdd8201dSApple OSS Distributions unsigned long value = strtoul(value_str, &endp, 10);
34*fdd8201dSApple OSS Distributions T_QUIET; T_WITH_ERRNO; T_ASSERT_EQ_CHAR(*endp, '\0',
35*fdd8201dSApple OSS Distributions "strtoul(\"%s\") not called on a valid number", value_str);
36*fdd8201dSApple OSS Distributions T_QUIET; T_WITH_ERRNO; T_ASSERT_NE_ULONG(value, ULONG_MAX,
37*fdd8201dSApple OSS Distributions "strtoul(\"%s\") overflow", value_str);
38*fdd8201dSApple OSS Distributions
39*fdd8201dSApple OSS Distributions T_QUIET; T_ASSERT_NE_ULONG(value, 0ul, "%s invalid", var);
40*fdd8201dSApple OSS Distributions T_QUIET; T_ASSERT_LT_ULONG(value, ID_MAX, "%s invalid", var);
41*fdd8201dSApple OSS Distributions return (unsigned)value;
42*fdd8201dSApple OSS Distributions }
43*fdd8201dSApple OSS Distributions #endif /* TARGET_OS_OSX */
44*fdd8201dSApple OSS Distributions
45*fdd8201dSApple OSS Distributions void
drop_priv(void)46*fdd8201dSApple OSS Distributions drop_priv(void)
47*fdd8201dSApple OSS Distributions {
48*fdd8201dSApple OSS Distributions #if TARGET_OS_OSX
49*fdd8201dSApple OSS Distributions uid_t lower_uid = _get_sudo_invoker(INVOKER_UID);
50*fdd8201dSApple OSS Distributions gid_t lower_gid = _get_sudo_invoker(INVOKER_GID);
51*fdd8201dSApple OSS Distributions #else
52*fdd8201dSApple OSS Distributions struct passwd *pw = getpwnam("mobile");
53*fdd8201dSApple OSS Distributions T_QUIET; T_WITH_ERRNO; T_ASSERT_NOTNULL(pw, "getpwnam(\"mobile\")");
54*fdd8201dSApple OSS Distributions uid_t lower_uid = pw->pw_uid;
55*fdd8201dSApple OSS Distributions gid_t lower_gid = pw->pw_gid;
56*fdd8201dSApple OSS Distributions #endif
57*fdd8201dSApple OSS Distributions T_ASSERT_POSIX_SUCCESS(setgid(lower_gid), "Change group to %u", lower_gid);
58*fdd8201dSApple OSS Distributions T_ASSERT_POSIX_SUCCESS(setuid(lower_uid), "Change user to %u", lower_uid);
59*fdd8201dSApple OSS Distributions }
60*fdd8201dSApple OSS Distributions
61*fdd8201dSApple OSS Distributions bool
running_as_root(void)62*fdd8201dSApple OSS Distributions running_as_root(void)
63*fdd8201dSApple OSS Distributions {
64*fdd8201dSApple OSS Distributions return geteuid() == 0;
65*fdd8201dSApple OSS Distributions }
66