mirror of
https://github.com/SELinuxProject/selinux
synced 2024-12-21 05:30:13 +00:00
fed78faaa3
These are similar to the libselinux utilities but operate on a binary
policy instead of the running kernel. This allows to run them on
SELinux disabled or even non Linux systems, e.g. for development or
continuous integration.
sepol_check_access:
(similar to selinux_check_access)
Check access:
$ sepol_check_access policy.bin staff_u:staff_r:gpg_t:s0 sysadm_u:sysadm_r:gpg_t:s0 process fork
requested permission fork denied by constraint; reason:
constrain process { fork setexec setfscreate setcurrent execmem execstack execheap setkeycreate setsockcreate } ((r1 == r2 -Fail-) ); Constraint DENIED
constrain process { signull getsched getsession getpgid getcap getattr getrlimit } ((r1 == r2 -Fail-) or (r1 != { staff_r user_r logadm_r apache2adm_r } -Fail-) and (t1 == rbacproc_read -Fail-) or (t1 == rbacproc_full -Fail-) or (t1 == systemd_user_instance_domain -Fail-) and (u2 == system_u -Fail-) and (r2 == system_r -Fail-) and (t2 == systemd_t -Fail-) ); Constraint DENIED
constrain process { sigchld sigkill sigstop signal ptrace setsched setpgid setcap share setrlimit } ((r1 == r2 -Fail-) or (r1 != { staff_r user_r logadm_r apache2adm_r } -Fail-) and (t1 == rbacproc_full -Fail-) or (t1 == systemd_user_instance_domain -Fail-) and (u2 == system_u -Fail-) and (r2 == system_r -Fail-) and (t2 == systemd_t -Fail-) ); Constraint DENIED
sepol_compute_av:
(similar to compute_av)
Compute access vectors:
$ sepol_compute_av policy.bin staff_u:staff_r:gpg_t:s0 staff_u:staff_r:gpg_t:s0 process
allowed: fork sigchld signull signal getsched setsched setpgid getcap setcap setrlimit
decided: fork transition sigchld sigkill sigstop signull signal ptrace getsched setsched getsession getpgid setpgid getcap setcap share getattr setexec setfscreate noatsecure siginh setrlimit rlimitinh dyntransition setcurrent execmem execstack execheap setkeycreate setsockcreate getrlimit
auditallow:
auditdeny: fork transition sigchld sigkill sigstop signull signal ptrace getsched setsched getsession getpgid setpgid getcap setcap share getattr setexec setfscreate noatsecure siginh setrlimit rlimitinh dyntransition setcurrent execmem execstack execheap setkeycreate setsockcreate getrlimit
sepol_compute_member:
(similar to compute_member)
Compute a SID to use when selecting a member of a polyinstantiated object:
$ sepol_compute_member policy.bin staff_u:staff_r:staff_t:s0 system_u:object_r:tmp_t:s0 dir
system_u:object_r:user_tmp_t:s0
sepol_compute_relabel:
(similar to compute_relabel)
Compute a SID to use for relabeling an object:
$ sepol_compute_relabel policy.bin staff_u:staff_r:staff_t:s0 system_u:object_r:tty_device_t:s0 chr_file
staff_u:object_r:user_tty_device_t:s0
sepol_validate_transition:
(similar to validatetrans)
Compute a validatetrans decision:
$ sepol_validate_transition policy.bin system_u:object_r:user_tmp_t:s0 system_u:object_r:shadow_t:s0 file staff_u:staff_r:staff_t:s0
allowed
Acked-by: James Carter <jwcart2@gmail.com>
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sepol/policydb/services.h>
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#include <sepol/sepol.h>
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int main(int argc, char *argv[])
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{
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FILE *fp;
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sepol_security_id_t ssid, tsid, out_sid;
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sepol_security_class_t tclass;
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char *context;
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size_t context_len;
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if (argc != 5) {
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printf("usage: %s policy scontext tcontext tclass\n", argv[0]);
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return 1;
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}
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fp = fopen(argv[1], "r");
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if (!fp) {
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fprintf(stderr, "Can't open policy %s: %s\n", argv[1], strerror(errno));
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return 1;
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}
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if (sepol_set_policydb_from_file(fp) < 0) {
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fprintf(stderr, "Error while processing policy %s: %s\n", argv[1], strerror(errno));
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fclose(fp);
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return 1;
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}
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fclose(fp);
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if (sepol_context_to_sid(argv[2], strlen(argv[2]), &ssid) < 0) {
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fprintf(stderr, "Invalid source context %s\n", argv[2]);
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return 1;
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}
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if (sepol_context_to_sid(argv[3], strlen(argv[3]), &tsid) < 0) {
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fprintf(stderr, "Invalid target context %s\n", argv[3]);
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return 1;
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}
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if (sepol_string_to_security_class(argv[4], &tclass) < 0) {
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fprintf(stderr, "Invalid security class %s\n", argv[4]);
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return 1;
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}
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if (sepol_change_sid(ssid, tsid, tclass, &out_sid) < 0) {
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fprintf(stderr, "Failed to compute changed sid: %s\n", strerror(errno));
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return 1;
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}
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if (sepol_sid_to_context(out_sid, &context, &context_len) < 0) {
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fprintf(stderr, "Failed to convert sid %u: %s\n", out_sid, strerror(errno));
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return 1;
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}
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printf("%s\n", context);
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free(context);
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return 0;
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}
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