fafff8f1ff
Let's fold get_user_creds_clean() into get_user_creds(), and introduce a flags argument for it to select "clean" behaviour. This flags parameter also learns to other new flags: - USER_CREDS_SYNTHESIZE_FALLBACK: in this mode the user records for root/nobody are only synthesized as fallback. Normally, the synthesized records take precedence over what is in the user database. With this flag set this is reversed, and the user database takes precedence, and the synthesized records are only used if they are missing there. This flag should be set in cases where doing NSS is deemed safe, and where there's interest in knowing the correct shell, for example if the admin changed root's shell to zsh or suchlike. - USER_CREDS_ALLOW_MISSING: if set, and a UID/GID is specified by numeric value, and there's no user/group record for it accept it anyway. This allows us to fix #9767 This then also ports all users to set the most appropriate flags. Fixes: #9767 [zj: remove one isempty() call]
114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <grp.h>
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#include <gshadow.h>
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#include <pwd.h>
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#include <shadow.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <unistd.h>
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bool uid_is_valid(uid_t uid);
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static inline bool gid_is_valid(gid_t gid) {
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return uid_is_valid((uid_t) gid);
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}
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int parse_uid(const char *s, uid_t* ret_uid);
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static inline int parse_gid(const char *s, gid_t *ret_gid) {
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return parse_uid(s, (uid_t*) ret_gid);
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}
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char* getlogname_malloc(void);
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char* getusername_malloc(void);
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typedef enum UserCredsFlags {
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USER_CREDS_SYNTHESIZE_FALLBACK = 1 << 0, /* if set, only synthesize user records if database lacks them. Normally we bypass the userdb entirely for the records we can synthesize */
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USER_CREDS_ALLOW_MISSING = 1 << 1, /* if a numeric UID string is resolved, be OK if there's no record for it */
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USER_CREDS_CLEAN = 1 << 2, /* try to clean up shell and home fields with invalid data */
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} UserCredsFlags;
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int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home, const char **shell, UserCredsFlags flags);
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int get_group_creds(const char **groupname, gid_t *gid, UserCredsFlags flags);
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char* uid_to_name(uid_t uid);
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char* gid_to_name(gid_t gid);
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int in_gid(gid_t gid);
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int in_group(const char *name);
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int get_home_dir(char **ret);
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int get_shell(char **_ret);
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int reset_uid_gid(void);
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int take_etc_passwd_lock(const char *root);
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#define UID_INVALID ((uid_t) -1)
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#define GID_INVALID ((gid_t) -1)
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#define UID_NOBODY ((uid_t) 65534U)
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#define GID_NOBODY ((gid_t) 65534U)
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#define ETC_PASSWD_LOCK_PATH "/etc/.pwd.lock"
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static inline bool uid_is_dynamic(uid_t uid) {
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return DYNAMIC_UID_MIN <= uid && uid <= DYNAMIC_UID_MAX;
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}
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static inline bool gid_is_dynamic(gid_t gid) {
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return uid_is_dynamic((uid_t) gid);
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}
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static inline bool uid_is_system(uid_t uid) {
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return uid <= SYSTEM_UID_MAX;
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}
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static inline bool gid_is_system(gid_t gid) {
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return gid <= SYSTEM_GID_MAX;
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}
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/* The following macros add 1 when converting things, since UID 0 is a valid UID, while the pointer
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* NULL is special */
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#define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1))
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#define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
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#define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1))
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#define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
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static inline bool userns_supported(void) {
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return access("/proc/self/uid_map", F_OK) >= 0;
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}
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bool valid_user_group_name(const char *u);
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bool valid_user_group_name_or_id(const char *u);
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bool valid_gecos(const char *d);
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bool valid_home(const char *p);
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static inline bool valid_shell(const char *p) {
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/* We have the same requirements, so just piggy-back on the home check.
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*
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* Let's ignore /etc/shells because this is only applicable to real and
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* not system users. It is also incompatible with the idea of empty /etc.
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*/
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return valid_home(p);
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}
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int maybe_setgroups(size_t size, const gid_t *list);
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bool synthesize_nobody(void);
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int fgetpwent_sane(FILE *stream, struct passwd **pw);
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int fgetspent_sane(FILE *stream, struct spwd **sp);
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int fgetgrent_sane(FILE *stream, struct group **gr);
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int putpwent_sane(const struct passwd *pw, FILE *stream);
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int putspent_sane(const struct spwd *sp, FILE *stream);
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int putgrent_sane(const struct group *gr, FILE *stream);
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#if ENABLE_GSHADOW
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int fgetsgent_sane(FILE *stream, struct sgrp **sg);
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int putsgent_sane(const struct sgrp *sg, FILE *stream);
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#endif
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