Adding upstream version 252.22.upstream/252.22

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 597 insertions, 0 deletions

diff --git a/src/shared/acl-util.c b/src/shared/acl-util.c
new file mode 100644
index 0000000..c9752ab
--- /dev/null
+++ b/src/shared/acl-util.c
@@ -0,0 +1,597 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "acl-util.h"
+#include "alloc-util.h"
+#include "errno-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "user-util.h"
+#include "util.h"
+
+#if HAVE_ACL
+
+int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *ret_entry) {
+        acl_entry_t i;
+        int r;
+
+        assert(acl);
+        assert(uid_is_valid(uid));
+        assert(ret_entry);
+
+        for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
+             r > 0;
+             r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
+
+                acl_tag_t tag;
+                uid_t *u;
+                bool b;
+
+                if (acl_get_tag_type(i, &tag) < 0)
+                        return -errno;
+
+                if (tag != ACL_USER)
+                        continue;
+
+                u = acl_get_qualifier(i);
+                if (!u)
+                        return -errno;
+
+                b = *u == uid;
+                acl_free(u);
+
+                if (b) {
+                        *ret_entry = i;
+                        return 1;
+                }
+        }
+        if (r < 0)
+                return -errno;
+
+        *ret_entry = NULL;
+        return 0;
+}
+
+int calc_acl_mask_if_needed(acl_t *acl_p) {
+        acl_entry_t i;
+        int r;
+        bool need = false;
+
+        assert(acl_p);
+
+        for (r = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
+             r > 0;
+             r = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
+                acl_tag_t tag;
+
+                if (acl_get_tag_type(i, &tag) < 0)
+                        return -errno;
+
+                if (tag == ACL_MASK)
+                        return 0;
+
+                if (IN_SET(tag, ACL_USER, ACL_GROUP))
+                        need = true;
+        }
+        if (r < 0)
+                return -errno;
+
+        if (need && acl_calc_mask(acl_p) < 0)
+                return -errno;
+
+        return need;
+}
+
+int add_base_acls_if_needed(acl_t *acl_p, const char *path) {
+        acl_entry_t i;
+        int r;
+        bool have_user_obj = false, have_group_obj = false, have_other = false;
+        struct stat st;
+        _cleanup_(acl_freep) acl_t basic = NULL;
+
+        assert(acl_p);
+
+        for (r = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
+             r > 0;
+             r = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
+                acl_tag_t tag;
+
+                if (acl_get_tag_type(i, &tag) < 0)
+                        return -errno;
+
+                if (tag == ACL_USER_OBJ)
+                        have_user_obj = true;
+                else if (tag == ACL_GROUP_OBJ)
+                        have_group_obj = true;
+                else if (tag == ACL_OTHER)
+                        have_other = true;
+                if (have_user_obj && have_group_obj && have_other)
+                        return 0;
+        }
+        if (r < 0)
+                return -errno;
+
+        r = stat(path, &st);
+        if (r < 0)
+                return -errno;
+
+        basic = acl_from_mode(st.st_mode);
+        if (!basic)
+                return -errno;
+
+        for (r = acl_get_entry(basic, ACL_FIRST_ENTRY, &i);
+             r > 0;
+             r = acl_get_entry(basic, ACL_NEXT_ENTRY, &i)) {
+                acl_tag_t tag;
+                acl_entry_t dst;
+
+                if (acl_get_tag_type(i, &tag) < 0)
+                        return -errno;
+
+                if ((tag == ACL_USER_OBJ && have_user_obj) ||
+                    (tag == ACL_GROUP_OBJ && have_group_obj) ||
+                    (tag == ACL_OTHER && have_other))
+                        continue;
+
+                r = acl_create_entry(acl_p, &dst);
+                if (r < 0)
+                        return -errno;
+
+                r = acl_copy_entry(dst, i);
+                if (r < 0)
+                        return -errno;
+        }
+        if (r < 0)
+                return -errno;
+        return 0;
+}
+
+int acl_search_groups(const char *path, char ***ret_groups) {
+        _cleanup_strv_free_ char **g = NULL;
+        _cleanup_(acl_freep) acl_t acl = NULL;
+        bool ret = false;
+        acl_entry_t entry;
+        int r;
+
+        assert(path);
+
+        acl = acl_get_file(path, ACL_TYPE_DEFAULT);
+        if (!acl)
+                return -errno;
+
+        r = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
+        for (;;) {
+                _cleanup_(acl_free_gid_tpp) gid_t *gid = NULL;
+                acl_tag_t tag;
+
+                if (r < 0)
+                        return -errno;
+                if (r == 0)
+                        break;
+
+                if (acl_get_tag_type(entry, &tag) < 0)
+                        return -errno;
+
+                if (tag != ACL_GROUP)
+                        goto next;
+
+                gid = acl_get_qualifier(entry);
+                if (!gid)
+                        return -errno;
+
+                if (in_gid(*gid) > 0) {
+                        if (!ret_groups)
+                                return true;
+
+                        ret = true;
+                }
+
+                if (ret_groups) {
+                        char *name;
+
+                        name = gid_to_name(*gid);
+                        if (!name)
+                                return -ENOMEM;
+
+                        r = strv_consume(&g, name);
+                        if (r < 0)
+                                return r;
+                }
+
+        next:
+                r = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
+        }
+
+        if (ret_groups)
+                *ret_groups = TAKE_PTR(g);
+
+        return ret;
+}
+
+int parse_acl(const char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask) {
+        _cleanup_free_ char **a = NULL, **d = NULL; /* strings are not freed */
+        _cleanup_strv_free_ char **split = NULL;
+        int r = -EINVAL;
+        _cleanup_(acl_freep) acl_t a_acl = NULL, d_acl = NULL;
+
+        split = strv_split(text, ",");
+        if (!split)
+                return -ENOMEM;
+
+        STRV_FOREACH(entry, split) {
+                char *p;
+
+                p = STARTSWITH_SET(*entry, "default:", "d:");
+                if (p)
+                        r = strv_push(&d, p);
+                else
+                        r = strv_push(&a, *entry);
+                if (r < 0)
+                        return r;
+        }
+
+        if (!strv_isempty(a)) {
+                _cleanup_free_ char *join = NULL;
+
+                join = strv_join(a, ",");
+                if (!join)
+                        return -ENOMEM;
+
+                a_acl = acl_from_text(join);
+                if (!a_acl)
+                        return -errno;
+
+                if (want_mask) {
+                        r = calc_acl_mask_if_needed(&a_acl);
+                        if (r < 0)
+                                return r;
+                }
+        }
+
+        if (!strv_isempty(d)) {
+                _cleanup_free_ char *join = NULL;
+
+                join = strv_join(d, ",");
+                if (!join)
+                        return -ENOMEM;
+
+                d_acl = acl_from_text(join);
+                if (!d_acl)
+                        return -errno;
+
+                if (want_mask) {
+                        r = calc_acl_mask_if_needed(&d_acl);
+                        if (r < 0)
+                                return r;
+                }
+        }
+
+        *acl_access = TAKE_PTR(a_acl);
+        *acl_default = TAKE_PTR(d_acl);
+
+        return 0;
+}
+
+static int acl_entry_equal(acl_entry_t a, acl_entry_t b) {
+        acl_tag_t tag_a, tag_b;
+
+        if (acl_get_tag_type(a, &tag_a) < 0)
+                return -errno;
+
+        if (acl_get_tag_type(b, &tag_b) < 0)
+                return -errno;
+
+        if (tag_a != tag_b)
+                return false;
+
+        switch (tag_a) {
+        case ACL_USER_OBJ:
+        case ACL_GROUP_OBJ:
+        case ACL_MASK:
+        case ACL_OTHER:
+                /* can have only one of those */
+                return true;
+        case ACL_USER: {
+                _cleanup_(acl_free_uid_tpp) uid_t *uid_a = NULL, *uid_b = NULL;
+
+                uid_a = acl_get_qualifier(a);
+                if (!uid_a)
+                        return -errno;
+
+                uid_b = acl_get_qualifier(b);
+                if (!uid_b)
+                        return -errno;
+
+                return *uid_a == *uid_b;
+        }
+        case ACL_GROUP: {
+                _cleanup_(acl_free_gid_tpp) gid_t *gid_a = NULL, *gid_b = NULL;
+
+                gid_a = acl_get_qualifier(a);
+                if (!gid_a)
+                        return -errno;
+
+                gid_b = acl_get_qualifier(b);
+                if (!gid_b)
+                        return -errno;
+
+                return *gid_a == *gid_b;
+        }
+        default:
+                assert_not_reached();
+        }
+}
+
+static int find_acl_entry(acl_t acl, acl_entry_t entry, acl_entry_t *out) {
+        acl_entry_t i;
+        int r;
+
+        for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
+             r > 0;
+             r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
+
+                r = acl_entry_equal(i, entry);
+                if (r < 0)
+                        return r;
+                if (r > 0) {
+                        *out = i;
+                        return 1;
+                }
+        }
+        if (r < 0)
+                return -errno;
+        return 0;
+}
+
+int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl) {
+        _cleanup_(acl_freep) acl_t old;
+        acl_entry_t i;
+        int r;
+
+        old = acl_get_file(path, type);
+        if (!old)
+                return -errno;
+
+        for (r = acl_get_entry(new, ACL_FIRST_ENTRY, &i);
+             r > 0;
+             r = acl_get_entry(new, ACL_NEXT_ENTRY, &i)) {
+
+                acl_entry_t j;
+
+                r = find_acl_entry(old, i, &j);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        if (acl_create_entry(&old, &j) < 0)
+                                return -errno;
+
+                if (acl_copy_entry(j, i) < 0)
+                        return -errno;
+        }
+        if (r < 0)
+                return -errno;
+
+        *acl = TAKE_PTR(old);
+
+        return 0;
+}
+
+/* POSIX says that ACL_{READ,WRITE,EXECUTE} don't have to be bitmasks. But that is a natural thing to do and
+ * all extant implementations do it. Let's make sure that we fail verbosely in the (imho unlikely) scenario
+ * that we get a new implementation that does not satisfy this. */
+assert_cc(!(ACL_READ & ACL_WRITE));
+assert_cc(!(ACL_WRITE & ACL_EXECUTE));
+assert_cc(!(ACL_EXECUTE & ACL_READ));
+assert_cc((unsigned) ACL_READ == ACL_READ);
+assert_cc((unsigned) ACL_WRITE == ACL_WRITE);
+assert_cc((unsigned) ACL_EXECUTE == ACL_EXECUTE);
+
+int fd_add_uid_acl_permission(
+                int fd,
+                uid_t uid,
+                unsigned mask) {
+
+        _cleanup_(acl_freep) acl_t acl = NULL;
+        acl_permset_t permset;
+        acl_entry_t entry;
+        int r;
+
+        /* Adds an ACL entry for the specified file to allow the indicated access to the specified
+         * user. Operates purely incrementally. */
+
+        assert(fd >= 0);
+        assert(uid_is_valid(uid));
+
+        acl = acl_get_fd(fd);
+        if (!acl)
+                return -errno;
+
+        r = acl_find_uid(acl, uid, &entry);
+        if (r <= 0) {
+                if (acl_create_entry(&acl, &entry) < 0 ||
+                    acl_set_tag_type(entry, ACL_USER) < 0 ||
+                    acl_set_qualifier(entry, &uid) < 0)
+                        return -errno;
+        }
+
+        if (acl_get_permset(entry, &permset) < 0)
+                return -errno;
+
+        if ((mask & ACL_READ) && acl_add_perm(permset, ACL_READ) < 0)
+                return -errno;
+        if ((mask & ACL_WRITE) && acl_add_perm(permset, ACL_WRITE) < 0)
+                return -errno;
+        if ((mask & ACL_EXECUTE) && acl_add_perm(permset, ACL_EXECUTE) < 0)
+                return -errno;
+
+        r = calc_acl_mask_if_needed(&acl);
+        if (r < 0)
+                return r;
+
+        if (acl_set_fd(fd, acl) < 0)
+                return -errno;
+
+        return 0;
+}
+
+int fd_acl_make_read_only(int fd) {
+        _cleanup_(acl_freep) acl_t acl = NULL;
+        bool changed = false;
+        acl_entry_t i;
+        int r;
+
+        assert(fd >= 0);
+
+        /* Safely drops all W bits from all relevant ACL entries of the file, without changing entries which
+         * are masked by the ACL mask */
+
+        acl = acl_get_fd(fd);
+        if (!acl) {
+
+                if (!ERRNO_IS_NOT_SUPPORTED(errno))
+                        return -errno;
+
+                /* No ACLs? Then just update the regular mode_t */
+                return fd_acl_make_read_only_fallback(fd);
+        }
+
+        for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
+             r > 0;
+             r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
+                acl_permset_t permset;
+                acl_tag_t tag;
+                int b;
+
+                if (acl_get_tag_type(i, &tag) < 0)
+                        return -errno;
+
+                /* These three control the x bits overall (as ACL_MASK affects all remaining tags) */
+                if (!IN_SET(tag, ACL_USER_OBJ, ACL_MASK, ACL_OTHER))
+                        continue;
+
+                if (acl_get_permset(i, &permset) < 0)
+                        return -errno;
+
+                b = acl_get_perm(permset, ACL_WRITE);
+                if (b < 0)
+                        return -errno;
+
+                if (b) {
+                        if (acl_delete_perm(permset, ACL_WRITE) < 0)
+                                return -errno;
+
+                        changed = true;
+                }
+        }
+        if (r < 0)
+                return -errno;
+
+        if (!changed)
+                return 0;
+
+        if (acl_set_fd(fd, acl) < 0) {
+                if (!ERRNO_IS_NOT_SUPPORTED(errno))
+                        return -errno;
+
+                return fd_acl_make_read_only_fallback(fd);
+        }
+
+        return 1;
+}
+
+int fd_acl_make_writable(int fd) {
+        _cleanup_(acl_freep) acl_t acl = NULL;
+        acl_entry_t i;
+        int r;
+
+        /* Safely adds the writable bit to the owner's ACL entry of this inode. (And only the owner's! – This
+         * not the obvious inverse of fd_acl_make_read_only() hence!) */
+
+        acl = acl_get_fd(fd);
+        if (!acl) {
+                if (!ERRNO_IS_NOT_SUPPORTED(errno))
+                        return -errno;
+
+                /* No ACLs? Then just update the regular mode_t */
+                return fd_acl_make_writable_fallback(fd);
+        }
+
+        for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
+             r > 0;
+             r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
+                acl_permset_t permset;
+                acl_tag_t tag;
+                int b;
+
+                if (acl_get_tag_type(i, &tag) < 0)
+                        return -errno;
+
+                if (tag != ACL_USER_OBJ)
+                        continue;
+
+                if (acl_get_permset(i, &permset) < 0)
+                        return -errno;
+
+                b = acl_get_perm(permset, ACL_WRITE);
+                if (b < 0)
+                        return -errno;
+
+                if (b)
+                        return 0; /* Already set? Then there's nothing to do. */
+
+                if (acl_add_perm(permset, ACL_WRITE) < 0)
+                        return -errno;
+
+                break;
+        }
+        if (r < 0)
+                return -errno;
+
+        if (acl_set_fd(fd, acl) < 0) {
+                if (!ERRNO_IS_NOT_SUPPORTED(errno))
+                        return -errno;
+
+                return fd_acl_make_writable_fallback(fd);
+        }
+
+        return 1;
+}
+#endif
+
+int fd_acl_make_read_only_fallback(int fd) {
+        struct stat st;
+
+        assert(fd >= 0);
+
+        if (fstat(fd, &st) < 0)
+                return -errno;
+
+        if ((st.st_mode & 0222) == 0)
+                return 0;
+
+        if (fchmod(fd, st.st_mode & 0555) < 0)
+                return -errno;
+
+        return 1;
+}
+
+int fd_acl_make_writable_fallback(int fd) {
+        struct stat st;
+
+        assert(fd >= 0);
+
+        if (fstat(fd, &st) < 0)
+                return -errno;
+
+        if ((st.st_mode & 0200) != 0) /* already set */
+                return 0;
+
+        if (fchmod(fd, (st.st_mode & 07777) | 0200) < 0)
+                return -errno;
+
+        return 1;
+}