diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/core/namespace.c | 75 |
1 files changed, 53 insertions, 22 deletions
diff --git a/src/core/namespace.c b/src/core/namespace.c index 985e343096..43a2f4ba6e 100644 --- a/src/core/namespace.c +++ b/src/core/namespace.c @@ -97,6 +97,23 @@ static const TargetMount protect_kernel_tunables_table[] = { { "/sys/fs/cgroup", READWRITE, false }, /* READONLY is set by ProtectControlGroups= option */ }; +/* + * ProtectHome=read-only table, protect $HOME and $XDG_RUNTIME_DIR and rest of + * system should be protected by ProtectSystem= + */ +static const TargetMount protect_home_read_only_table[] = { + { "/home", READONLY, true }, + { "/run/user", READONLY, true }, + { "/root", READONLY, true }, +}; + +/* ProtectHome=yes table */ +static const TargetMount protect_home_yes_table[] = { + { "/home", INACCESSIBLE, true }, + { "/run/user", INACCESSIBLE, true }, + { "/root", INACCESSIBLE, true }, +}; + /* ProtectSystem=yes table */ static const TargetMount protect_system_yes_table[] = { { "/usr", READONLY, false }, @@ -190,6 +207,31 @@ static int append_protect_kernel_tunables(BindMount **p, const char *root_direct ELEMENTSOF(protect_kernel_tunables_table)); } +static int append_protect_home(BindMount **p, const char *root_directory, ProtectHome protect_home) { + int r = 0; + + assert(p); + + if (protect_home == PROTECT_HOME_NO) + return 0; + + switch (protect_home) { + case PROTECT_HOME_READ_ONLY: + r = append_target_mounts(p, root_directory, protect_home_read_only_table, + ELEMENTSOF(protect_home_read_only_table)); + break; + case PROTECT_HOME_YES: + r = append_target_mounts(p, root_directory, protect_home_yes_table, + ELEMENTSOF(protect_home_yes_table)); + break; + default: + r = -EINVAL; + break; + } + + return r; +} + static int append_protect_system(BindMount **p, const char *root_directory, ProtectSystem protect_system) { int r = 0; @@ -629,6 +671,7 @@ static unsigned namespace_calculate_mounts( ProtectHome protect_home, ProtectSystem protect_system) { + unsigned protect_home_cnt; unsigned protect_system_cnt = (protect_system == PROTECT_SYSTEM_STRICT ? ELEMENTSOF(protect_system_strict_table) : @@ -637,6 +680,12 @@ static unsigned namespace_calculate_mounts( ((protect_system == PROTECT_SYSTEM_YES) ? ELEMENTSOF(protect_system_yes_table) : 0))); + protect_home_cnt = + (protect_home == PROTECT_HOME_YES ? + ELEMENTSOF(protect_home_yes_table) : + ((protect_home == PROTECT_HOME_READ_ONLY) ? + ELEMENTSOF(protect_home_read_only_table) : 0)); + return !!tmp_dir + !!var_tmp_dir + strv_length(read_write_paths) + strv_length(read_only_paths) + @@ -644,8 +693,7 @@ static unsigned namespace_calculate_mounts( private_dev + (protect_sysctl ? ELEMENTSOF(protect_kernel_tunables_table) : 0) + (protect_cgroups ? 1 : 0) + - (protect_home != PROTECT_HOME_NO || protect_system == PROTECT_SYSTEM_STRICT ? 3 : 0) + - protect_system_cnt; + protect_home_cnt + protect_system_cnt; } int setup_namespace( @@ -723,26 +771,9 @@ int setup_namespace( m++; } - if (protect_home != PROTECT_HOME_NO || protect_system == PROTECT_SYSTEM_STRICT) { - const char *home_dir, *run_user_dir, *root_dir; - - /* If protection of $HOME and $XDG_RUNTIME_DIR is requested, then go for it. If we are in - * strict system protection mode, then also add entries for these directories, but mark them - * writable. This is because we want ProtectHome= and ProtectSystem= to be fully orthogonal. */ - - home_dir = prefix_roota(root_directory, "/home"); - home_dir = strjoina("-", home_dir); - run_user_dir = prefix_roota(root_directory, "/run/user"); - run_user_dir = strjoina("-", run_user_dir); - root_dir = prefix_roota(root_directory, "/root"); - root_dir = strjoina("-", root_dir); - - r = append_mounts(&m, STRV_MAKE(home_dir, run_user_dir, root_dir), - protect_home == PROTECT_HOME_READ_ONLY ? READONLY : - protect_home == PROTECT_HOME_YES ? INACCESSIBLE : READWRITE); - if (r < 0) - return r; - } + r = append_protect_home(&m, root_directory, protect_home); + if (r < 0) + return r; r = append_protect_system(&m, root_directory, protect_system); if (r < 0) |