diff options
Diffstat (limited to 'libbb')
| -rw-r--r-- | libbb/selinux_common.c | 14 | ||||
| -rw-r--r-- | libbb/update_passwd.c | 29 |
2 files changed, 43 insertions, 0 deletions
diff --git a/libbb/selinux_common.c b/libbb/selinux_common.c index ff076f6..7478cc7 100644 --- a/libbb/selinux_common.c +++ b/libbb/selinux_common.c @@ -38,3 +38,17 @@ void setfscreatecon_or_die(security_context_t scontext) "file creation context to %s", scontext); } } + +void selinux_preserve_fcontext(int fdesc) +{ + security_context_t context; + + if (fgetfilecon(fdesc, &context) < 0) { + if (errno == ENODATA || errno == ENOTSUP) + return; + bb_perror_msg_and_die("fgetfilecon failed"); + } + setfscreatecon_or_die(context); + freecon(context); +} + diff --git a/libbb/update_passwd.c b/libbb/update_passwd.c index 8914b8b..388adf8 100644 --- a/libbb/update_passwd.c +++ b/libbb/update_passwd.c @@ -11,6 +11,31 @@ #include "libbb.h" +#if ENABLE_SELINUX +static void check_selinux_update_passwd(const char *username) +{ + security_context_t context; + char *seuser; + + if (getuid() != (uid_t)0 || is_selinux_enabled() == 0) + return; /* No need to check */ + + if (getprevcon_raw(&context) < 0) + bb_perror_msg_and_die("getprevcon failed"); + seuser = strtok(context, ":"); + if (!seuser) + bb_error_msg_and_die("invalid context '%s'", context); + if (strcmp(seuser, username) != 0) { + if (checkPasswdAccess(PASSWD__PASSWD) != 0) + bb_error_msg_and_die("SELinux: access denied"); + } + if (ENABLE_FEATURE_CLEAN_UP) + freecon(context); +} +#else +#define check_selinux_update_passwd(username) ((void)0) +#endif + int update_passwd(const char *filename, const char *username, const char *new_pw) { @@ -27,6 +52,8 @@ int update_passwd(const char *filename, const char *username, int cnt = 0; int ret = -1; /* failure */ + check_selinux_update_passwd(username); + /* New passwd file, "/etc/passwd+" for now */ fnamesfx = xasprintf("%s+", filename); sfx_char = &fnamesfx[strlen(fnamesfx)-1]; @@ -38,6 +65,8 @@ int update_passwd(const char *filename, const char *username, goto free_mem; old_fd = fileno(old_fp); + selinux_preserve_fcontext(old_fd); + /* Try to create "/etc/passwd+". Wait if it exists. */ i = 30; do { |