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Merge pull request netblue30#5315 from ChrysoliteAzalea/landlock
Add Landlock support to Firejail
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| #define _GNU_SOURCE | ||
| #include <stdio.h> | ||
| #include <stddef.h> | ||
| #include <stdlib.h> | ||
| #include <unistd.h> | ||
| #include <fcntl.h> | ||
| #include <sys/syscall.h> | ||
| #include <sys/types.h> | ||
| #include <sys/prctl.h> | ||
| #include <linux/prctl.h> | ||
| #include <linux/landlock.h> | ||
|
|
||
| int landlock_create_ruleset(struct landlock_ruleset_attr *rsattr,size_t size,__u32 flags) { | ||
| return syscall(__NR_landlock_create_ruleset,rsattr,size,flags); | ||
| } | ||
|
|
||
| int landlock_add_rule(int fd,enum landlock_rule_type t,void *attr,__u32 flags) { | ||
| return syscall(__NR_landlock_add_rule,fd,t,attr,flags); | ||
| } | ||
|
|
||
| int landlock_restrict_self(int fd,__u32 flags) { | ||
| prctl(PR_SET_NO_NEW_PRIVS,1,0,0,0); | ||
| int result = syscall(__NR_landlock_restrict_self,fd,flags); | ||
| if (result!=0) return result; | ||
| else { | ||
| close(fd); | ||
| return 0; | ||
| } | ||
| } | ||
|
|
||
| int create_full_ruleset() { | ||
| struct landlock_ruleset_attr attr; | ||
| attr.handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR | LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_REMOVE_FILE | LANDLOCK_ACCESS_FS_REMOVE_DIR | LANDLOCK_ACCESS_FS_MAKE_CHAR | LANDLOCK_ACCESS_FS_MAKE_DIR | LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_MAKE_SOCK | LANDLOCK_ACCESS_FS_MAKE_FIFO | LANDLOCK_ACCESS_FS_MAKE_BLOCK | LANDLOCK_ACCESS_FS_MAKE_SYM | LANDLOCK_ACCESS_FS_EXECUTE; | ||
| return landlock_create_ruleset(&attr,sizeof(attr),0); | ||
| } | ||
|
|
||
| int add_read_access_rule_by_path(int rset_fd,char *allowed_path) { | ||
| int result; | ||
| int allowed_fd = open(allowed_path,O_PATH | O_CLOEXEC); | ||
| struct landlock_path_beneath_attr target; | ||
| target.parent_fd = allowed_fd; | ||
| target.allowed_access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR; | ||
| result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0); | ||
| close(allowed_fd); | ||
| return result; | ||
| } | ||
|
|
||
| int add_write_access_rule_by_path(int rset_fd,char *allowed_path) { | ||
| int result; | ||
| int allowed_fd = open(allowed_path,O_PATH | O_CLOEXEC); | ||
| struct landlock_path_beneath_attr target; | ||
| target.parent_fd = allowed_fd; | ||
| target.allowed_access = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_REMOVE_FILE | LANDLOCK_ACCESS_FS_REMOVE_DIR | LANDLOCK_ACCESS_FS_MAKE_CHAR | LANDLOCK_ACCESS_FS_MAKE_DIR | LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_MAKE_SYM; | ||
| result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0); | ||
| close(allowed_fd); | ||
| return result; | ||
| } | ||
|
|
||
| int add_create_special_rule_by_path(int rset_fd,char *allowed_path) { | ||
| int result; | ||
| int allowed_fd = open(allowed_path,O_PATH | O_CLOEXEC); | ||
| struct landlock_path_beneath_attr target; | ||
| target.parent_fd = allowed_fd; | ||
| target.allowed_access = LANDLOCK_ACCESS_FS_MAKE_SOCK | LANDLOCK_ACCESS_FS_MAKE_FIFO | LANDLOCK_ACCESS_FS_MAKE_BLOCK; | ||
| result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0); | ||
| close(allowed_fd); | ||
| return result; | ||
| } | ||
|
|
||
| int add_execute_rule_by_path(int rset_fd,char *allowed_path) { | ||
| int result; | ||
| int allowed_fd = open(allowed_path,O_PATH | O_CLOEXEC); | ||
| struct landlock_path_beneath_attr target; | ||
| target.parent_fd = allowed_fd; | ||
| target.allowed_access = LANDLOCK_ACCESS_FS_EXECUTE; | ||
| result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0); | ||
| close(allowed_fd); | ||
| return result; | ||
| } |
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