diff options
Diffstat (limited to 'src/jailtest/access.c')
-rw-r--r-- | src/jailtest/access.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/jailtest/access.c b/src/jailtest/access.c new file mode 100644 index 000000000..e68227bd2 --- /dev/null +++ b/src/jailtest/access.c | |||
@@ -0,0 +1,124 @@ | |||
1 | #include "jailtest.h" | ||
2 | #include <dirent.h> | ||
3 | #include <sys/wait.h> | ||
4 | |||
5 | typedef struct { | ||
6 | char *tfile; | ||
7 | char *tdir; | ||
8 | } TestDir; | ||
9 | |||
10 | #define MAX_TEST_FILES 16 | ||
11 | TestDir td[MAX_TEST_FILES]; | ||
12 | static int files_cnt = 0; | ||
13 | |||
14 | void access_setup(const char *directory) { | ||
15 | // I am root! | ||
16 | assert(directory); | ||
17 | assert(user_home_dir); | ||
18 | |||
19 | if (files_cnt >= MAX_TEST_FILES) { | ||
20 | fprintf(stderr, "Error: maximum number of test directories exceded\n"); | ||
21 | exit(1); | ||
22 | } | ||
23 | |||
24 | char *fname = strdup(directory); | ||
25 | if (!fname) | ||
26 | errExit("strdup"); | ||
27 | if (strncmp(fname, "~/", 2) == 0) { | ||
28 | free(fname); | ||
29 | if (asprintf(&fname, "%s/%s", user_home_dir, directory + 2) == -1) | ||
30 | errExit("asprintf"); | ||
31 | } | ||
32 | |||
33 | char *path = realpath(fname, NULL); | ||
34 | free(fname); | ||
35 | if (path == NULL) { | ||
36 | fprintf(stderr, "Warning: invalid directory %s, skipping...\n", directory); | ||
37 | return; | ||
38 | } | ||
39 | |||
40 | // file in home directory | ||
41 | if (strncmp(path, user_home_dir, strlen(user_home_dir)) != 0) { | ||
42 | fprintf(stderr, "Warning: file %s is not in user home directory, skipping...\n", directory); | ||
43 | free(path); | ||
44 | return; | ||
45 | } | ||
46 | |||
47 | // try to open the dir as root | ||
48 | DIR *dir = opendir(path); | ||
49 | if (!dir) { | ||
50 | fprintf(stderr, "Warning: directory %s not found, skipping\n", directory); | ||
51 | free(path); | ||
52 | return; | ||
53 | } | ||
54 | closedir(dir); | ||
55 | |||
56 | // create a test file | ||
57 | char *test_file; | ||
58 | if (asprintf(&test_file, "%s/jailtest-access-%d", path, getpid()) == -1) | ||
59 | errExit("asprintf"); | ||
60 | |||
61 | FILE *fp = fopen(test_file, "w"); | ||
62 | if (!fp) { | ||
63 | printf("Warning: I cannot create test file in directory %s, skipping...\n", directory); | ||
64 | return; | ||
65 | } | ||
66 | fprintf(fp, "this file was created by firetest utility, you can safely delete it\n"); | ||
67 | fclose(fp); | ||
68 | int rv = chown(test_file, user_uid, user_gid); | ||
69 | if (rv) | ||
70 | errExit("chown"); | ||
71 | |||
72 | char *dname = strdup(directory); | ||
73 | if (!dname) | ||
74 | errExit("strdup"); | ||
75 | td[files_cnt].tdir = dname; | ||
76 | td[files_cnt].tfile = test_file; | ||
77 | files_cnt++; | ||
78 | } | ||
79 | |||
80 | void access_destroy(void) { | ||
81 | // remove test files | ||
82 | int i; | ||
83 | |||
84 | for (i = 0; i < files_cnt; i++) { | ||
85 | int rv = unlink(td[i].tfile); | ||
86 | (void) rv; | ||
87 | } | ||
88 | files_cnt = 0; | ||
89 | } | ||
90 | |||
91 | void access_test(void) { | ||
92 | // I am root in sandbox mount namespace | ||
93 | assert(user_uid); | ||
94 | int i; | ||
95 | |||
96 | pid_t child = fork(); | ||
97 | if (child == -1) | ||
98 | errExit("fork"); | ||
99 | |||
100 | if (child == 0) { // child | ||
101 | // drop privileges | ||
102 | if (setgid(user_gid) != 0) | ||
103 | errExit("setgid"); | ||
104 | if (setuid(user_uid) != 0) | ||
105 | errExit("setuid"); | ||
106 | |||
107 | for (i = 0; i < files_cnt; i++) { | ||
108 | assert(td[i].tfile); | ||
109 | |||
110 | // try to open the file for reading | ||
111 | FILE *fp = fopen(td[i].tfile, "r"); | ||
112 | if (fp) { | ||
113 | |||
114 | printf(" Warning: I can read %s\n", td[i].tdir); | ||
115 | fclose(fp); | ||
116 | } | ||
117 | } | ||
118 | exit(0); | ||
119 | } | ||
120 | |||
121 | // wait for the child to finish | ||
122 | int status; | ||
123 | wait(&status); | ||
124 | } | ||