1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>
/**
* small utility to use instead of "su" when we want to just
* switch to the vespa user without any more fuss
**/
int main(int argc, char** argv)
{
if (argc < 2) {
fprintf(stderr, "missing arguments, usage: vespa-run-as-vespa-user <cmd> [args ...]\n");
return 1;
}
const char *username = getenv("VESPA_USER");
if (username == nullptr) {
username = "vespa";
}
struct passwd *p = getpwnam(username);
if (p == nullptr) {
fprintf(stderr, "FATAL error: user '%s' missing in passwd file\n", username);
return 1;
}
gid_t g = p->pw_gid;
uid_t u = p->pw_uid;
gid_t grouplist[256];
int group_arr_sz = 256;
#ifdef __APPLE__
int mac_gid = g;
int mac_groups[256];
int ggl = getgrouplist(username, mac_gid, mac_groups, &group_arr_sz);
if (ggl < 0) {
group_arr_sz = 0;
} else {
for (int i = 0; i < group_arr_sz; ++i) {
grouplist[i] = (gid_t) mac_groups[i];
}
}
#else
int ggl = getgrouplist(username, g, grouplist, &group_arr_sz);
#endif
gid_t oldg = getgid();
uid_t oldu = getuid();
if (g != oldg && setgid(g) != 0) {
perror("FATAL error: could not change group id");
return 1;
}
size_t listsize = 1;
if (ggl >= 0 && group_arr_sz > 0) {
listsize = group_arr_sz;
} else {
grouplist[0] = g;
}
if ((g != oldg || u != oldu) && setgroups(listsize, grouplist) != 0) {
perror("FATAL error: could not setgroups");
return 1;
}
if (u != oldu && setuid(u) != 0) {
perror("FATAL error: could not change user id");
return 1;
}
execvp(argv[1], &argv[1]);
perror("FATAL error: execvp failed");
return 1;
}
|
