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authorGravatar Ladislav Michl <Ladislav.Michl@seznam.cz>2010-06-27 03:23:31 +0200
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2010-06-27 03:23:31 +0200
commita73b87e9343df2a6f14e328a977e7b70eb3ed707 (patch)
tree564869bde93c870b20f6d4d8a3da71e42b629f2e /loginutils
parent1b14cdb27ca5e8104a824424731be430c8592dd6 (diff)
downloadbusybox-a73b87e9343df2a6f14e328a977e7b70eb3ed707.tar.gz
busybox-a73b87e9343df2a6f14e328a977e7b70eb3ed707.tar.bz2
*: s/"/bin/sh"/DEFAULT_SHELL, run_shell() API fix, remove unneeded strdup
function old new delta run_shell 157 166 +9 su_main 477 470 -7 sulogin_main 515 503 -12 Signed-off-by: Ladislav Michl <Ladislav.Michl@seznam.cz> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'loginutils')
-rw-r--r--loginutils/login.c12
-rw-r--r--loginutils/su.c57
-rw-r--r--loginutils/sulogin.c8
3 files changed, 40 insertions, 37 deletions
diff --git a/loginutils/login.c b/loginutils/login.c
index 078cd68ed..88ed0af78 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -201,7 +201,7 @@ int login_main(int argc UNUSED_PARAM, char **argv)
};
char *fromhost;
char username[USERNAME_SIZE];
- const char *tmp;
+ const char *shell;
int run_by_root;
unsigned opt;
int count = 0;
@@ -389,10 +389,10 @@ int login_main(int argc UNUSED_PARAM, char **argv)
run_login_script(pw, full_tty);
change_identity(pw);
- tmp = pw->pw_shell;
- if (!tmp || !*tmp)
- tmp = DEFAULT_SHELL;
- setup_environment(tmp,
+ shell = pw->pw_shell;
+ if (!shell || !shell[0])
+ shell = DEFAULT_SHELL;
+ setup_environment(shell,
(!(opt & LOGIN_OPT_p) * SETUP_ENV_CLEARENV) + SETUP_ENV_CHANGEENV,
pw);
@@ -427,7 +427,7 @@ int login_main(int argc UNUSED_PARAM, char **argv)
signal(SIGINT, SIG_DFL);
/* Exec login shell with no additional parameters */
- run_shell(tmp, 1, NULL, NULL);
+ run_shell(shell, 1, NULL, NULL);
/* return EXIT_FAILURE; - not reached */
}
diff --git a/loginutils/su.c b/loginutils/su.c
index af25655fd..9bae37551 100644
--- a/loginutils/su.c
+++ b/loginutils/su.c
@@ -10,23 +10,27 @@
#if ENABLE_FEATURE_SU_CHECKS_SHELLS
/* Return 1 if SHELL is a restricted shell (one not returned by
- getusershell), else 0, meaning it is a standard shell. */
+ * getusershell), else 0, meaning it is a standard shell. */
static int restricted_shell(const char *shell)
{
char *line;
+ int result = 1;
/*setusershell(); - getusershell does it itself*/
while ((line = getusershell()) != NULL) {
- if (/* *line != '#' && */ strcmp(line, shell) == 0)
- return 0;
+ if (/* *line != '#' && */ strcmp(line, shell) == 0) {
+ result = 0;
+ break;
+ }
}
- endusershell();
- return 1;
+ if (ENABLE_FEATURE_CLEAN_UP)
+ endusershell();
+ return result;
}
#endif
#define SU_OPT_mp (3)
-#define SU_OPT_l (4)
+#define SU_OPT_l (4)
int su_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int su_main(int argc UNUSED_PARAM, char **argv)
@@ -38,7 +42,8 @@ int su_main(int argc UNUSED_PARAM, char **argv)
struct passwd *pw;
uid_t cur_uid = getuid();
const char *tty;
- char *old_user;
+ char user_buf[64];
+ const char *old_user;
flags = getopt32(argv, "mplc:s:", &opt_command, &opt_shell);
//argc -= optind;
@@ -56,21 +61,18 @@ int su_main(int argc UNUSED_PARAM, char **argv)
}
if (ENABLE_FEATURE_SU_SYSLOG) {
- /* The utmp entry (via getlogin) is probably the best way to identify
- * the user, especially if someone su's from a su-shell.
+ /* The utmp entry (via getlogin) is probably the best way to
+ * identify the user, especially if someone su's from a su-shell.
* But getlogin can fail -- usually due to lack of utmp entry.
* in this case resort to getpwuid. */
- const char *user;
#if ENABLE_FEATURE_UTMP
- char user_buf[64];
- user = user_buf;
+ old_user = user_buf;
if (getlogin_r(user_buf, sizeof(user_buf)) != 0)
#endif
{
pw = getpwuid(cur_uid);
- user = pw ? pw->pw_name : "";
+ old_user = pw ? xstrdup(pw->pw_name) : "";
}
- old_user = xstrdup(user);
tty = xmalloc_ttyname(2);
if (!tty) {
tty = "none";
@@ -80,13 +82,7 @@ int su_main(int argc UNUSED_PARAM, char **argv)
pw = xgetpwnam(opt_username);
- /* Make sure pw->pw_shell is non-NULL. It may be NULL when NEW_USER
- is a username that is retrieved via NIS (YP), but that doesn't have
- a default shell listed. */
- if (!pw->pw_shell || !pw->pw_shell[0])
- pw->pw_shell = (char *)DEFAULT_SHELL;
-
- if ((cur_uid == 0) || correct_password(pw)) {
+ if (cur_uid == 0 || correct_password(pw)) {
if (ENABLE_FEATURE_SU_SYSLOG)
syslog(LOG_NOTICE, "%c %s %s:%s",
'+', tty, old_user, opt_username);
@@ -99,21 +95,30 @@ int su_main(int argc UNUSED_PARAM, char **argv)
if (ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_SU_SYSLOG) {
closelog();
- free(old_user);
}
- if (!opt_shell && (flags & SU_OPT_mp))
+ if (!opt_shell && (flags & SU_OPT_mp)) {
+ /* -s SHELL is not given, but "preserve env" opt is */
opt_shell = getenv("SHELL");
+ }
+
+ /* Make sure pw->pw_shell is non-NULL. It may be NULL when NEW_USER
+ * is a username that is retrieved via NIS (YP), that doesn't have
+ * a default shell listed. */
+ if (!pw->pw_shell || !pw->pw_shell[0])
+ pw->pw_shell = (char *)DEFAULT_SHELL;
#if ENABLE_FEATURE_SU_CHECKS_SHELLS
if (opt_shell && cur_uid != 0 && restricted_shell(pw->pw_shell)) {
/* The user being su'd to has a nonstandard shell, and so is
- probably a uucp account or has restricted access. Don't
- compromise the account by allowing access with a standard
- shell. */
+ * probably a uucp account or has restricted access. Don't
+ * compromise the account by allowing access with a standard
+ * shell. */
bb_error_msg("using restricted shell");
opt_shell = NULL;
}
+ /* else: user can run whatever he wants via "su -s PROG USER".
+ * This is safe since PROG is run under user's uid/gid. */
#endif
if (!opt_shell)
opt_shell = pw->pw_shell;
diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c
index 6e3d3b019..3516013f1 100644
--- a/loginutils/sulogin.c
+++ b/loginutils/sulogin.c
@@ -101,11 +101,9 @@ int sulogin_main(int argc UNUSED_PARAM, char **argv)
shell = getenv("SUSHELL");
if (!shell)
shell = getenv("sushell");
- if (!shell) {
- shell = "/bin/sh";
- if (pwd->pw_shell[0])
- shell = pwd->pw_shell;
- }
+ if (!shell)
+ shell = pwd->pw_shell;
+
/* Exec login shell with no additional parameters. Never returns. */
run_shell(shell, 1, NULL, NULL);