sysusers: Preserve ownership and mode on /etc/passwd and friends

[elogind.git] / src / sysusers / sysusers.c

diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
index b889ed0536dd41b92232e554e6ec6cdaa1c955a6..c133dc5f1036b61b3dc2a8c8b22d5b1806ba5db8 100644 (file)
--- a/src/sysusers/sysusers.c
+++ b/src/sysusers/sysusers.c
@@ -107,11 +107,11 @@ static int load_user_database(void) {
         if (!f)
                 return errno == ENOENT ? 0 : -errno;
 
-        r = hashmap_ensure_allocated(&database_user, string_hash_func, string_compare_func);
+        r = hashmap_ensure_allocated(&database_user, &string_hash_ops);
         if (r < 0)
                 return r;
 
-        r = hashmap_ensure_allocated(&database_uid, trivial_hash_func, trivial_compare_func);
+        r = hashmap_ensure_allocated(&database_uid, NULL);
         if (r < 0)
                 return r;
 
@@ -159,11 +159,11 @@ static int load_group_database(void) {
         if (!f)
                 return errno == ENOENT ? 0 : -errno;
 
-        r = hashmap_ensure_allocated(&database_group, string_hash_func, string_compare_func);
+        r = hashmap_ensure_allocated(&database_group, &string_hash_ops);
         if (r < 0)
                 return r;
 
-        r = hashmap_ensure_allocated(&database_gid, trivial_hash_func, trivial_compare_func);
+        r = hashmap_ensure_allocated(&database_gid, NULL);
         if (r < 0)
                 return r;
 
@@ -358,6 +358,7 @@ static int write_files(void) {
         _cleanup_fclose_ FILE *passwd = NULL, *group = NULL, *shadow = NULL, *gshadow = NULL;
         _cleanup_free_ char *passwd_tmp = NULL, *group_tmp = NULL, *shadow_tmp = NULL, *gshadow_tmp = NULL;
         const char *passwd_path = NULL, *group_path = NULL, *shadow_path = NULL, *gshadow_path = NULL;
+        struct stat st;
         bool group_changed = false;
         Iterator iterator;
         Item *i;
@@ -372,15 +373,17 @@ static int write_files(void) {
                 if (r < 0)
                         goto finish;
 
-                if (fchmod(fileno(group), 0644) < 0) {
-                        r = -errno;
-                        goto finish;
-                }
-
                 original = fopen(group_path, "re");
                 if (original) {
                         struct group *gr;
 
+                        if (fstat(fileno(original), &st) < 0 ||
+                            fchmod(fileno(group), st.st_mode & 07777) < 0 ||
+                            fchown(fileno(group), st.st_uid, st.st_gid) < 0) {
+                                r = -errno;
+                                goto finish;
+                        }
+
                         errno = 0;
                         while ((gr = fgetgrent(original))) {
                                 /* Safety checks against name and GID
@@ -418,6 +421,9 @@ static int write_files(void) {
                 } else if (errno != ENOENT) {
                         r = -errno;
                         goto finish;
+                } else if (fchmod(fileno(group), 0644) < 0) {
+                        r = -errno;
+                        goto finish;
                 }
 
                 HASHMAP_FOREACH(i, todo_gids, iterator) {
@@ -449,15 +455,17 @@ static int write_files(void) {
                 if (r < 0)
                         goto finish;
 
-                if (fchmod(fileno(gshadow), 0000) < 0) {
-                        r = -errno;
-                        goto finish;
-                }
-
                 original = fopen(gshadow_path, "re");
                 if (original) {
                         struct sgrp *sg;
 
+                        if (fstat(fileno(original), &st) < 0 ||
+                            fchmod(fileno(gshadow), st.st_mode & 07777) < 0 ||
+                            fchown(fileno(gshadow), st.st_uid, st.st_gid) < 0) {
+                                r = -errno;
+                                goto finish;
+                        }
+
                         errno = 0;
                         while ((sg = fgetsgent(original))) {
 
@@ -483,6 +491,9 @@ static int write_files(void) {
                 } else if (errno != ENOENT) {
                         r = -errno;
                         goto finish;
+                } else if (fchmod(fileno(gshadow), 0000) < 0) {
+                        r = -errno;
+                        goto finish;
                 }
 
                 HASHMAP_FOREACH(i, todo_gids, iterator) {
@@ -513,15 +524,17 @@ static int write_files(void) {
                 if (r < 0)
                         goto finish;
 
-                if (fchmod(fileno(passwd), 0644) < 0) {
-                        r = -errno;
-                        goto finish;
-                }
-
                 original = fopen(passwd_path, "re");
                 if (original) {
                         struct passwd *pw;
 
+                        if (fstat(fileno(original), &st) < 0 ||
+                            fchmod(fileno(passwd), st.st_mode & 07777) < 0 ||
+                            fchown(fileno(passwd), st.st_uid, st.st_gid) < 0) {
+                                r = -errno;
+                                goto finish;
+                        }
+
                         errno = 0;
                         while ((pw = fgetpwent(original))) {
 
@@ -552,6 +565,9 @@ static int write_files(void) {
                 } else if (errno != ENOENT) {
                         r = -errno;
                         goto finish;
+                } else if (fchmod(fileno(passwd), 0644) < 0) {
+                        r = -errno;
+                        goto finish;
                 }
 
                 HASHMAP_FOREACH(i, todo_uids, iterator) {
@@ -596,15 +612,17 @@ static int write_files(void) {
                 if (r < 0)
                         goto finish;
 
-                if (fchmod(fileno(shadow), 0000) < 0) {
-                        r = -errno;
-                        goto finish;
-                }
-
                 original = fopen(shadow_path, "re");
                 if (original) {
                         struct spwd *sp;
 
+                        if (fstat(fileno(original), &st) < 0 ||
+                            fchmod(fileno(shadow), st.st_mode & 07777) < 0 ||
+                            fchown(fileno(shadow), st.st_uid, st.st_gid) < 0) {
+                                r = -errno;
+                                goto finish;
+                        }
+
                         errno = 0;
                         while ((sp = fgetspent(original))) {
 
@@ -629,6 +647,9 @@ static int write_files(void) {
                 } else if (errno != ENOENT) {
                         r = -errno;
                         goto finish;
+                } else if (fchmod(fileno(shadow), 0000) < 0) {
+                        r = -errno;
+                        goto finish;
                 }
 
                 lstchg = (long) (now(CLOCK_REALTIME) / USEC_PER_DAY);
@@ -796,8 +817,8 @@ static int root_stat(const char *p, struct stat *st) {
 static int read_id_from_file(Item *i, uid_t *_uid, gid_t *_gid) {
         struct stat st;
         bool found_uid = false, found_gid = false;
-        uid_t uid;
-        gid_t gid;
+        uid_t uid = 0;
+        gid_t gid = 0;
 
         assert(i);
 
@@ -969,7 +990,7 @@ static int add_user(Item *i) {
                 i->uid = search_uid;
         }
 
-        r = hashmap_ensure_allocated(&todo_uids, trivial_hash_func, trivial_compare_func);
+        r = hashmap_ensure_allocated(&todo_uids, NULL);
         if (r < 0)
                 return log_oom();
 
@@ -1122,7 +1143,7 @@ static int add_group(Item *i) {
                 i->gid = search_uid;
         }
 
-        r = hashmap_ensure_allocated(&todo_gids, trivial_hash_func, trivial_compare_func);
+        r = hashmap_ensure_allocated(&todo_gids, NULL);
         if (r < 0)
                 return log_oom();
 
@@ -1210,7 +1231,7 @@ static int add_implicit(void) {
                 if (!i) {
                         _cleanup_(item_freep) Item *j = NULL;
 
-                        r = hashmap_ensure_allocated(&groups, string_hash_func, string_compare_func);
+                        r = hashmap_ensure_allocated(&groups, &string_hash_ops);
                         if (r < 0)
                                 return log_oom();
 
@@ -1237,7 +1258,7 @@ static int add_implicit(void) {
                         if (!i) {
                                 _cleanup_(item_freep) Item *j = NULL;
 
-                                r = hashmap_ensure_allocated(&users, string_hash_func, string_compare_func);
+                                r = hashmap_ensure_allocated(&users, &string_hash_ops);
                                 if (r < 0)
                                         return log_oom();
 
@@ -1542,7 +1563,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
                         return -EINVAL;
                 }
 
-                r = hashmap_ensure_allocated(&members, string_hash_func, string_compare_func);
+                r = hashmap_ensure_allocated(&members, &string_hash_ops);
                 if (r < 0)
                         return log_oom();
 
@@ -1584,7 +1605,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
                         return -EINVAL;
                 }
 
-                r = hashmap_ensure_allocated(&users, string_hash_func, string_compare_func);
+                r = hashmap_ensure_allocated(&users, &string_hash_ops);
                 if (r < 0)
                         return log_oom();
 
@@ -1634,7 +1655,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
                         return -EINVAL;
                 }
 
-                r = hashmap_ensure_allocated(&groups, string_hash_func, string_compare_func);
+                r = hashmap_ensure_allocated(&groups, &string_hash_ops);
                 if (r < 0)
                         return log_oom();
 
@@ -1835,7 +1856,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        r = label_init(NULL);
+        r = mac_selinux_init(NULL);
         if (r < 0) {
                 log_error("SELinux setup failed: %s", strerror(-r));
                 goto finish;