1*2c2f96dcSApple OSS Distributions #include <darwintest.h>
2*2c2f96dcSApple OSS Distributions
3*2c2f96dcSApple OSS Distributions #include <TargetConditionals.h>
4*2c2f96dcSApple OSS Distributions #include <limits.h>
5*2c2f96dcSApple OSS Distributions #include <stdio.h>
6*2c2f96dcSApple OSS Distributions #include <stdlib.h>
7*2c2f96dcSApple OSS Distributions #include <string.h>
8*2c2f96dcSApple OSS Distributions #include <sys/errno.h>
9*2c2f96dcSApple OSS Distributions #include <unistd.h>
10*2c2f96dcSApple OSS Distributions
11*2c2f96dcSApple OSS Distributions #if !TARGET_OS_OSX
12*2c2f96dcSApple OSS Distributions #include <pwd.h>
13*2c2f96dcSApple OSS Distributions #include <sys/types.h>
14*2c2f96dcSApple OSS Distributions #include <uuid/uuid.h>
15*2c2f96dcSApple OSS Distributions #endif
16*2c2f96dcSApple OSS Distributions
17*2c2f96dcSApple OSS Distributions #include "drop_priv.h"
18*2c2f96dcSApple OSS Distributions
19*2c2f96dcSApple OSS Distributions #if TARGET_OS_OSX
20*2c2f96dcSApple OSS Distributions #define INVOKER_UID "SUDO_UID"
21*2c2f96dcSApple OSS Distributions #define INVOKER_GID "SUDO_GID"
22*2c2f96dcSApple OSS Distributions #define ID_MAX (unsigned long)UINT_MAX
23*2c2f96dcSApple OSS Distributions static unsigned
_get_sudo_invoker(const char * var)24*2c2f96dcSApple OSS Distributions _get_sudo_invoker(const char *var)
25*2c2f96dcSApple OSS Distributions {
26*2c2f96dcSApple OSS Distributions char *value_str = getenv(var);
27*2c2f96dcSApple OSS Distributions T_QUIET; T_WITH_ERRNO; T_ASSERT_NOTNULL(value_str,
28*2c2f96dcSApple OSS Distributions "Not running under sudo, getenv(\"%s\") failed", var);
29*2c2f96dcSApple OSS Distributions T_QUIET; T_ASSERT_NE_CHAR(*value_str, '\0',
30*2c2f96dcSApple OSS Distributions "getenv(\"%s\") returned an empty string", var);
31*2c2f96dcSApple OSS Distributions
32*2c2f96dcSApple OSS Distributions char *endp;
33*2c2f96dcSApple OSS Distributions unsigned long value = strtoul(value_str, &endp, 10);
34*2c2f96dcSApple OSS Distributions T_QUIET; T_WITH_ERRNO; T_ASSERT_EQ_CHAR(*endp, '\0',
35*2c2f96dcSApple OSS Distributions "strtoul(\"%s\") not called on a valid number", value_str);
36*2c2f96dcSApple OSS Distributions T_QUIET; T_WITH_ERRNO; T_ASSERT_NE_ULONG(value, ULONG_MAX,
37*2c2f96dcSApple OSS Distributions "strtoul(\"%s\") overflow", value_str);
38*2c2f96dcSApple OSS Distributions
39*2c2f96dcSApple OSS Distributions T_QUIET; T_ASSERT_NE_ULONG(value, 0ul, "%s invalid", var);
40*2c2f96dcSApple OSS Distributions T_QUIET; T_ASSERT_LT_ULONG(value, ID_MAX, "%s invalid", var);
41*2c2f96dcSApple OSS Distributions return (unsigned)value;
42*2c2f96dcSApple OSS Distributions }
43*2c2f96dcSApple OSS Distributions #endif /* TARGET_OS_OSX */
44*2c2f96dcSApple OSS Distributions
45*2c2f96dcSApple OSS Distributions void
drop_priv(void)46*2c2f96dcSApple OSS Distributions drop_priv(void)
47*2c2f96dcSApple OSS Distributions {
48*2c2f96dcSApple OSS Distributions #if TARGET_OS_OSX
49*2c2f96dcSApple OSS Distributions uid_t lower_uid = _get_sudo_invoker(INVOKER_UID);
50*2c2f96dcSApple OSS Distributions gid_t lower_gid = _get_sudo_invoker(INVOKER_GID);
51*2c2f96dcSApple OSS Distributions #else
52*2c2f96dcSApple OSS Distributions struct passwd *pw = getpwnam("mobile");
53*2c2f96dcSApple OSS Distributions T_QUIET; T_WITH_ERRNO; T_ASSERT_NOTNULL(pw, "getpwnam(\"mobile\")");
54*2c2f96dcSApple OSS Distributions uid_t lower_uid = pw->pw_uid;
55*2c2f96dcSApple OSS Distributions gid_t lower_gid = pw->pw_gid;
56*2c2f96dcSApple OSS Distributions #endif
57*2c2f96dcSApple OSS Distributions T_ASSERT_POSIX_SUCCESS(setgid(lower_gid), "Change group to %u", lower_gid);
58*2c2f96dcSApple OSS Distributions T_ASSERT_POSIX_SUCCESS(setuid(lower_uid), "Change user to %u", lower_uid);
59*2c2f96dcSApple OSS Distributions }
60*2c2f96dcSApple OSS Distributions
61*2c2f96dcSApple OSS Distributions bool
running_as_root(void)62*2c2f96dcSApple OSS Distributions running_as_root(void)
63*2c2f96dcSApple OSS Distributions {
64*2c2f96dcSApple OSS Distributions return geteuid() == 0;
65*2c2f96dcSApple OSS Distributions }
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