This patch has been brewing in my busybox package for SLIND for
quite a while (initially written against bb 1.01). chpasswd is
useful for setting passwords in a non-interactive way.
Description:
chpasswd reads a file of user name and password pairs from
standard input and uses this information to update a group of
existing users.
Signed-off-by: Alexander Shishkin <[EMAIL PROTECTED]>
---
include/applets.h | 1 +
include/libbb.h | 3 +
include/usage.h | 12 +++++
libbb/Kbuild | 3 +-
libbb/update_passwd.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++
loginutils/Config.in | 8 +++
loginutils/Kbuild | 1 +
loginutils/chpasswd.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++
loginutils/passwd.c | 109 --------------------------------------------
9 files changed, 267 insertions(+), 110 deletions(-)
create mode 100644 libbb/update_passwd.c
create mode 100644 loginutils/chpasswd.c
diff --git a/include/applets.h b/include/applets.h
index 90af4f4..a05f74a 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -89,6 +89,7 @@ USE_CHCON(APPLET(chcon, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_CHGRP(APPLET_NOEXEC(chgrp, chgrp, _BB_DIR_BIN, _BB_SUID_NEVER, chgrp))
USE_CHMOD(APPLET_NOEXEC(chmod, chmod, _BB_DIR_BIN, _BB_SUID_NEVER, chmod))
USE_CHOWN(APPLET_NOEXEC(chown, chown, _BB_DIR_BIN, _BB_SUID_NEVER, chown))
+USE_CHPASSWD(APPLET(chpasswd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
USE_CHPST(APPLET(chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_CHROOT(APPLET(chroot, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
USE_CHRT(APPLET(chrt, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
diff --git a/include/libbb.h b/include/libbb.h
index 46860c6..bef3ca4 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -778,6 +778,9 @@ extern void print_login_prompt(void);
extern void crypt_make_salt(char *p, int cnt);
+extern int update_passwd(const char *filename, const char *username,
+ const char *new_pw);
+
int get_terminal_width_height(const int fd, int *width, int *height);
int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...)
__attribute__ ((format (printf, 4, 5)));
diff --git a/include/usage.h b/include/usage.h
index 29a4991..d2a51d2 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -2520,6 +2520,18 @@
" -l Locks (disables) the specified user account\n" \
" -u Unlocks (re-enables) the specified user account"
+#define chpasswd_trivial_usage \
+ "[--md5|--encrypt]"
+#define chpasswd_full_usage \
+ "Read user:password information from stdin\n" \
+ "and update /etc/passwd accordingly." \
+ "\n\nOptions:\n" \
+ " -e, --encrypt\n" \
+ " Supplied passwords are in encrypted form.\n" \
+ " -m, --md5\n" \
+ " Use MD5 encryption instead DES when the supplied\n" \
+ " passwords are not encrypted.\n"
+
#define patch_trivial_usage \
"[-p<num>] [-i <diff>]"
#define patch_full_usage \
diff --git a/libbb/Kbuild b/libbb/Kbuild
index 6595867..c0cbe1a 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -104,7 +104,8 @@ lib-y += xreadlink.o
lib-$(CONFIG_FEATURE_MOUNT_LOOP) += loop.o
lib-$(CONFIG_LOSETUP) += loop.o
lib-$(CONFIG_FEATURE_MTAB_SUPPORT) += mtab.o
-lib-$(CONFIG_PASSWD) += pw_encrypt.o crypt_make_salt.o
+lib-$(CONFIG_PASSWD) += pw_encrypt.o crypt_make_salt.o update_passwd.o
+lib-$(CONFIG_CHPASSWD) += pw_encrypt.o crypt_make_salt.o update_passwd.o
lib-$(CONFIG_CRYPTPW) += pw_encrypt.o crypt_make_salt.o
lib-$(CONFIG_SULOGIN) += pw_encrypt.o
lib-$(CONFIG_FEATURE_HTTPD_AUTH_MD5) += pw_encrypt.o
diff --git a/libbb/update_passwd.c b/libbb/update_passwd.c
new file mode 100644
index 0000000..292bfa5
--- /dev/null
+++ b/libbb/update_passwd.c
@@ -0,0 +1,120 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * update_passwd
+ *
+ * update_passwd is a common function for passwd and chpasswd applets;
+ * it is responsible for updating password file (i.e. /etc/passwd or
+ * /etc/shadow) for a given user and password.
+ *
+ * Moved from loginutils/passwd.c by Alexander Shishkin <[EMAIL PROTECTED]>
+ */
+
+#include "libbb.h"
+
+int update_passwd(const char *filename, const char *username,
+ const char *new_pw)
+{
+ struct stat sb;
+ struct flock lock;
+ FILE *old_fp;
+ FILE *new_fp;
+ char *new_name;
+ char *last_char;
+ unsigned user_len;
+ int old_fd;
+ int new_fd;
+ int i;
+ int ret = 1; /* failure */
+
+ logmode = LOGMODE_STDIO;
+ /* New passwd file, "/etc/passwd+" for now */
+ new_name = xasprintf("%s+", filename);
+ last_char = &new_name[strlen(new_name)-1];
+ username = xasprintf("%s:", username);
+ user_len = strlen(username);
+
+ old_fp = fopen(filename, "r+");
+ if (!old_fp)
+ goto free_mem;
+ old_fd = fileno(old_fp);
+
+ /* Try to create "/etc/passwd+". Wait if it exists. */
+ i = 30;
+ do {
+ // FIXME: on last iteration try w/o O_EXCL but with O_TRUNC?
+ new_fd = open(new_name, O_WRONLY|O_CREAT|O_EXCL,0600);
+ if (new_fd >= 0) goto created;
+ if (errno != EEXIST) break;
+ usleep(100000); /* 0.1 sec */
+ } while (--i);
+ bb_perror_msg("cannot create '%s'", new_name);
+ goto close_old_fp;
+ created:
+ if (!fstat(old_fd, &sb)) {
+ fchmod(new_fd, sb.st_mode & 0777); /* ignore errors */
+ fchown(new_fd, sb.st_uid, sb.st_gid);
+ }
+ new_fp = fdopen(new_fd, "w");
+ if (!new_fp) {
+ close(new_fd);
+ goto unlink_new;
+ }
+
+ /* Backup file is "/etc/passwd-" */
+ last_char[0] = '-';
+ /* Delete old one, create new as a hardlink to current */
+ i = (unlink(new_name) && errno != ENOENT);
+ if (i || link(filename, new_name))
+ bb_perror_msg("warning: cannot create backup copy '%s'",
new_name);
+ last_char[0] = '+';
+
+ /* Lock the password file before updating */
+ lock.l_type = F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = 0;
+ lock.l_len = 0;
+ if (fcntl(old_fd, F_SETLK, &lock) < 0)
+ bb_perror_msg("warning: cannot lock '%s'", filename);
+ lock.l_type = F_UNLCK;
+
+ /* Read current password file, write updated one */
+ while (1) {
+ char *line = xmalloc_fgets(old_fp);
+ if (!line) break; /* EOF/error */
+ if (strncmp(username, line, user_len) == 0) {
+ /* we have a match with "username:"... */
+ const char *cp = line + user_len;
+ /* now cp -> old passwd, skip it: */
+ cp = strchr(cp, ':');
+ if (!cp) cp = "";
+ /* now cp -> ':' after old passwd or -> "" */
+ fprintf(new_fp, "%s%s%s", username, new_pw, cp);
+ /* Erase password in memory */
+ } else
+ fputs(line, new_fp);
+ free(line);
+ }
+ fcntl(old_fd, F_SETLK, &lock);
+
+ /* We do want all of them to execute, thus | instead of || */
+ if ((ferror(old_fp) | fflush(new_fp) | fsync(new_fd) | fclose(new_fp))
+ || rename(new_name, filename)
+ ) {
+ /* At least one of those failed */
+ goto unlink_new;
+ }
+ ret = 0; /* whee, success! */
+
+ unlink_new:
+ if (ret) unlink(new_name);
+
+ close_old_fp:
+ fclose(old_fp);
+
+ free_mem:
+ if (ENABLE_FEATURE_CLEAN_UP) free(new_name);
+ if (ENABLE_FEATURE_CLEAN_UP) free((char*)username);
+ logmode = LOGMODE_BOTH;
+ return ret;
+}
+
diff --git a/loginutils/Config.in b/loginutils/Config.in
index f9ae122..63ae9b4 100644
--- a/loginutils/Config.in
+++ b/loginutils/Config.in
@@ -180,6 +180,14 @@ config CRYPTPW
help
Applet for crypting a string.
+config CHPASSWD
+ bool "chpasswd"
+ default n
+ help
+ chpasswd reads a file of user name and password pairs from
+ standard input and uses this information to update a group of
+ existing users.
+
config SU
bool "su"
default n
diff --git a/loginutils/Kbuild b/loginutils/Kbuild
index 1b1165a..3d0d777 100644
--- a/loginutils/Kbuild
+++ b/loginutils/Kbuild
@@ -8,6 +8,7 @@ lib-y:=
lib-$(CONFIG_ADDGROUP) += addgroup.o
lib-$(CONFIG_ADDUSER) += adduser.o
lib-$(CONFIG_CRYPTPW) += cryptpw.o
+lib-$(CONFIG_CHPASSWD) += chpasswd.o
lib-$(CONFIG_GETTY) += getty.o
lib-$(CONFIG_LOGIN) += login.o
lib-$(CONFIG_PASSWD) += passwd.o
diff --git a/loginutils/chpasswd.c b/loginutils/chpasswd.c
new file mode 100644
index 0000000..76db672
--- /dev/null
+++ b/loginutils/chpasswd.c
@@ -0,0 +1,120 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * chpasswd.c
+ *
+ * Written for SLIND (from passwd.c) by Alexander Shishkin <[EMAIL PROTECTED]>
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <getopt.h> /* for struct option */
+#include <syslog.h>
+#include "libbb.h"
+
+static struct option const chpasswd_opts[] = {
+ { "encrypted", no_argument, 0, 'e' },
+ { "md5", no_argument, 0, 'm' }
+};
+
+int chpasswd_main(int argc, char **argv);
+int chpasswd_main(int argc, char **argv)
+{
+ char *name, *cp, *myname, *ret;
+ char buf[80];
+ char salt[sizeof("$N$XXXXXXXX")];
+ int enc = 0;
+ int md5 = 0;
+ int flag, amroot;
+ const struct passwd *pw;
+ struct rlimit rlimit_fsize;
+ char *pwfile =
+#ifndef ENABLE_FEATURE_SHADOWPASSWDS
+ bb_path_passwd_file;
+#else
+ bb_path_shadow_file;
+#endif
+
+ amroot = (getuid() == 0);
+ myname = (char *) xstrdup(bb_getpwuid(NULL, getuid(), -1));
+ while ((flag = getopt_long(argc, argv, "me", chpasswd_opts, NULL)) !=
EOF) {
+ switch (flag) {
+ case 'e':
+ enc = 1;
+ break;
+ case 'm':
+ md5 = 1;
+ break;
+ default:
+ bb_show_usage();
+ }
+ }
+
+ if (enc && md5)
+ bb_show_usage();
+
+ rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
+ setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
+ signal(SIGHUP, SIG_IGN);
+ signal(SIGINT, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ umask(077);
+
+ while (fgets(buf, sizeof buf, stdin) != NULL) {
+ cp = strchr(buf, '\n');
+ if (cp)
+ *cp = '\0';
+ else {
+ puts("Line too long.\n");
+ continue;
+ }
+
+ name = buf;
+ cp = strchr(name, ':');
+ if (cp)
+ *cp++ = '\0';
+ else {
+ puts("Missing new password.\n");
+ continue;
+ }
+
+ pw = getpwnam(name);
+ if (!pw)
+ bb_error_msg_and_die("Unknown user %s\n", name);
+
+ if (!amroot && cp[0] == '!') {
+ syslog(LOG_WARNING, "password locked for `%s'", name);
+ bb_error_msg_and_die(
+ "The password for `%s' cannot be
changed.\n", name
+ );
+ }
+
+ if (!enc) {
+ crypt_make_salt(salt, 1);
+
+ if (md5) {
+ strcpy(salt, "$1$");
+ crypt_make_salt(salt + 3, 4);
+ }
+
+ ret = xstrdup(pw_encrypt(cp, salt));
+ } else
+ ret = xstrdup(cp);
+
+ if (!update_passwd(pwfile, pw->pw_name, ret)) {
+ syslog(LOG_INFO, "password for `%s' changed by user
`%s'", name,
+ myname);
+ puts("Password changed.\n");
+ } else {
+ syslog(LOG_WARNING, "an error occurred updating the
password file");
+ bb_error_msg_and_die(
+ "An error occurred updating the
password file.\n"
+ );
+ }
+
+ free(ret);
+ }
+
+ if (ENABLE_FEATURE_CLEAN_UP) free(myname);
+
+ return 0;
+}
+
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index 8f65c3d..ac31682 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -70,115 +70,6 @@ static char* new_password(const struct passwd *pw, uid_t
myuid, int algo)
return ret;
}
-
-static int update_passwd(const char *filename, const char *username,
- const char *new_pw)
-{
- struct stat sb;
- struct flock lock;
- FILE *old_fp;
- FILE *new_fp;
- char *new_name;
- char *last_char;
- unsigned user_len;
- int old_fd;
- int new_fd;
- int i;
- int ret = 1; /* failure */
-
- logmode = LOGMODE_STDIO;
- /* New passwd file, "/etc/passwd+" for now */
- new_name = xasprintf("%s+", filename);
- last_char = &new_name[strlen(new_name)-1];
- username = xasprintf("%s:", username);
- user_len = strlen(username);
-
- old_fp = fopen(filename, "r+");
- if (!old_fp)
- goto free_mem;
- old_fd = fileno(old_fp);
-
- /* Try to create "/etc/passwd+". Wait if it exists. */
- i = 30;
- do {
- // FIXME: on last iteration try w/o O_EXCL but with O_TRUNC?
- new_fd = open(new_name, O_WRONLY|O_CREAT|O_EXCL,0600);
- if (new_fd >= 0) goto created;
- if (errno != EEXIST) break;
- usleep(100000); /* 0.1 sec */
- } while (--i);
- bb_perror_msg("cannot create '%s'", new_name);
- goto close_old_fp;
- created:
- if (!fstat(old_fd, &sb)) {
- fchmod(new_fd, sb.st_mode & 0777); /* ignore errors */
- fchown(new_fd, sb.st_uid, sb.st_gid);
- }
- new_fp = fdopen(new_fd, "w");
- if (!new_fp) {
- close(new_fd);
- goto unlink_new;
- }
-
- /* Backup file is "/etc/passwd-" */
- last_char[0] = '-';
- /* Delete old one, create new as a hardlink to current */
- i = (unlink(new_name) && errno != ENOENT);
- if (i || link(filename, new_name))
- bb_perror_msg("warning: cannot create backup copy '%s'",
new_name);
- last_char[0] = '+';
-
- /* Lock the password file before updating */
- lock.l_type = F_WRLCK;
- lock.l_whence = SEEK_SET;
- lock.l_start = 0;
- lock.l_len = 0;
- if (fcntl(old_fd, F_SETLK, &lock) < 0)
- bb_perror_msg("warning: cannot lock '%s'", filename);
- lock.l_type = F_UNLCK;
-
- /* Read current password file, write updated one */
- while (1) {
- char *line = xmalloc_fgets(old_fp);
- if (!line) break; /* EOF/error */
- if (strncmp(username, line, user_len) == 0) {
- /* we have a match with "username:"... */
- const char *cp = line + user_len;
- /* now cp -> old passwd, skip it: */
- cp = strchr(cp, ':');
- if (!cp) cp = "";
- /* now cp -> ':' after old passwd or -> "" */
- fprintf(new_fp, "%s%s%s", username, new_pw, cp);
- /* Erase password in memory */
- } else
- fputs(line, new_fp);
- free(line);
- }
- fcntl(old_fd, F_SETLK, &lock);
-
- /* We do want all of them to execute, thus | instead of || */
- if ((ferror(old_fp) | fflush(new_fp) | fsync(new_fd) | fclose(new_fp))
- || rename(new_name, filename)
- ) {
- /* At least one of those failed */
- goto unlink_new;
- }
- ret = 0; /* whee, success! */
-
- unlink_new:
- if (ret) unlink(new_name);
-
- close_old_fp:
- fclose(old_fp);
-
- free_mem:
- if (ENABLE_FEATURE_CLEAN_UP) free(new_name);
- if (ENABLE_FEATURE_CLEAN_UP) free((char*)username);
- logmode = LOGMODE_BOTH;
- return ret;
-}
-
-
int passwd_main(int argc, char **argv);
int passwd_main(int argc, char **argv)
{
--
1.5.1.2
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