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authorDenys Vlasenko <vda.linux@googlemail.com>2011-05-13 01:19:01 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2011-05-13 01:19:01 (GMT)
commit12a432715f066cf9d677316a39c9e0ebc6d72404 (patch)
tree14a33cdedbd6ba7739449cc3dec968b55a01efad
parent0806e401d6747c391fa0427e0ccba9951f9a1c3d (diff)
downloadbusybox-12a432715f066cf9d677316a39c9e0ebc6d72404.tar.gz
busybox-12a432715f066cf9d677316a39c9e0ebc6d72404.tar.bz2
adduser: safe username passing to passwd/addgroup
passwd: support creating SHA passwords random code shrink function old new delta crypt_make_pw_salt - 87 +87 adduser_main 883 904 +21 ... crypt_make_salt 99 89 -10 chpasswd_main 329 312 -17 packed_usage 28731 28691 -40 passwd_main 1070 1000 -70 cryptpw_main 310 224 -86 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 4/12 up/down: 154/-288) Total: -134 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--include/libbb.h9
-rw-r--r--libbb/pw_encrypt.c25
-rw-r--r--loginutils/adduser.c16
-rw-r--r--loginutils/chpasswd.c11
-rw-r--r--loginutils/cryptpw.c27
-rw-r--r--loginutils/passwd.c75
-rw-r--r--networking/httpd.c2
7 files changed, 88 insertions, 77 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 4232c38..89e8e44 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1259,14 +1259,19 @@ extern int correct_password(const struct passwd *pw) FAST_FUNC;
#endif
extern char *pw_encrypt(const char *clear, const char *salt, int cleanup) FAST_FUNC;
extern int obscure(const char *old, const char *newval, const struct passwd *pwdp) FAST_FUNC;
-/* rnd is additional random input. New one is returned.
+/*
+ * rnd is additional random input. New one is returned.
* Useful if you call crypt_make_salt many times in a row:
* rnd = crypt_make_salt(buf1, 4, 0);
* rnd = crypt_make_salt(buf2, 4, rnd);
* rnd = crypt_make_salt(buf3, 4, rnd);
* (otherwise we risk having same salt generated)
*/
-extern int crypt_make_salt(char *p, int cnt, int rnd) FAST_FUNC;
+extern int crypt_make_salt(char *p, int cnt /*, int rnd*/) FAST_FUNC;
+/* "$N$" + sha_salt_16_bytes + NUL */
+#define MAX_PW_SALT_LEN (3 + 16 + 1)
+extern char* crypt_make_pw_salt(char p[MAX_PW_SALT_LEN], const char *algo) FAST_FUNC;
+
/* Returns number of lines changed, or -1 on error */
#if !(ENABLE_FEATURE_ADDUSER_TO_GROUP || ENABLE_FEATURE_DEL_USER_FROM_GROUP)
diff --git a/libbb/pw_encrypt.c b/libbb/pw_encrypt.c
index c6c04d4..39ffa08 100644
--- a/libbb/pw_encrypt.c
+++ b/libbb/pw_encrypt.c
@@ -27,9 +27,10 @@ static int i64c(int i)
return ('a' - 38 + i);
}
-int FAST_FUNC crypt_make_salt(char *p, int cnt, int x)
+int FAST_FUNC crypt_make_salt(char *p, int cnt /*, int x */)
{
- x += getpid() + time(NULL);
+ /* was: x += ... */
+ int x = getpid() + monotonic_us();
do {
/* x = (x*1664525 + 1013904223) % 2^32 generator is lame
* (low-order bit is not "random", etc...),
@@ -47,6 +48,26 @@ int FAST_FUNC crypt_make_salt(char *p, int cnt, int x)
return x;
}
+char* FAST_FUNC crypt_make_pw_salt(char salt[MAX_PW_SALT_LEN], const char *algo)
+{
+ int len = 2/2;
+ char *salt_ptr = salt;
+ if (algo[0] != 'd') { /* not des */
+ len = 8/2; /* so far assuming md5 */
+ *salt_ptr++ = '$';
+ *salt_ptr++ = '1';
+ *salt_ptr++ = '$';
+#if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
+ if (algo[0] == 's') { /* sha */
+ salt[1] = '5' + (strcmp(algo, "sha512") == 0);
+ len = 16/2;
+ }
+#endif
+ }
+ crypt_make_salt(salt_ptr, len);
+ return salt_ptr;
+}
+
#if ENABLE_USE_BB_CRYPT
static char*
diff --git a/loginutils/adduser.c b/loginutils/adduser.c
index 1944d9d..a05b721 100644
--- a/loginutils/adduser.c
+++ b/loginutils/adduser.c
@@ -82,21 +82,23 @@ static void passwd_study(struct passwd *p)
static void addgroup_wrapper(struct passwd *p, const char *group_name)
{
- char *argv[5];
+ char *argv[6];
argv[0] = (char*)"addgroup";
if (group_name) {
/* Add user to existing group */
- argv[1] = p->pw_name;
- argv[2] = (char*)group_name;
- argv[3] = NULL;
+ argv[1] = (char*)"--";
+ argv[2] = p->pw_name;
+ argv[3] = (char*)group_name;
+ argv[4] = NULL;
} else {
/* Add user to his own group with the first free gid found in passwd_study */
//TODO: to be compatible with external addgroup programs we should use --gid instead...
argv[1] = (char*)"-g";
argv[2] = utoa(p->pw_gid);
- argv[3] = p->pw_name;
- argv[4] = NULL;
+ argv[3] = (char*)"--";
+ argv[4] = p->pw_name;
+ argv[5] = NULL;
}
spawn_and_wait(argv);
@@ -106,7 +108,7 @@ static void passwd_wrapper(const char *login_name) NORETURN;
static void passwd_wrapper(const char *login_name)
{
- BB_EXECLP("passwd", "passwd", login_name, NULL);
+ BB_EXECLP("passwd", "passwd", "--", login_name, NULL);
bb_error_msg_and_die("can't execute passwd, you must set password manually");
}
diff --git a/loginutils/chpasswd.c b/loginutils/chpasswd.c
index 6c4296f..f4718c8 100644
--- a/loginutils/chpasswd.c
+++ b/loginutils/chpasswd.c
@@ -37,9 +37,8 @@ int chpasswd_main(int argc UNUSED_PARAM, char **argv)
char *name, *pass;
char salt[sizeof("$N$XXXXXXXX")];
int opt, rc;
- int rnd = rnd; /* we *want* it to be non-initialized! */
- if (getuid())
+ if (getuid() != 0)
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
opt_complementary = "m--e:e--m";
@@ -55,10 +54,12 @@ int chpasswd_main(int argc UNUSED_PARAM, char **argv)
xuname2uid(name); /* dies if there is no such user */
if (!(opt & OPT_ENC)) {
- rnd = crypt_make_salt(salt, 1, rnd);
+ crypt_make_salt(salt, 1);
if (opt & OPT_MD5) {
- strcpy(salt, "$1$");
- rnd = crypt_make_salt(salt + 3, 4, rnd);
+ salt[0] = '$';
+ salt[1] = '1';
+ salt[2] = '$';
+ crypt_make_salt(salt + 3, 4);
}
pass = pw_encrypt(pass, salt, 0);
}
diff --git a/loginutils/cryptpw.c b/loginutils/cryptpw.c
index bbaa858..b25a39a 100644
--- a/loginutils/cryptpw.c
+++ b/loginutils/cryptpw.c
@@ -19,7 +19,7 @@
//usage: IF_LONG_OPTS(
//usage: "\n -P,--password-fd=N Read password from fd N"
/* //usage: "\n -s,--stdin Use stdin; like -P0" */
-//usage: "\n -m,--method=TYPE Encryption method TYPE"
+//usage: "\n -m,--method=TYPE Encryption method"
//usage: "\n -S,--salt=SALT"
//usage: )
//usage: IF_NOT_LONG_OPTS(
@@ -39,7 +39,7 @@
//usage: IF_LONG_OPTS(
//usage: "\n -P,--password-fd=N Read password from fd N"
/* //usage: "\n -s,--stdin Use stdin; like -P0" */
-//usage: "\n -m,--method=TYPE Encryption method TYPE"
+//usage: "\n -m,--method=TYPE Encryption method"
//usage: "\n -S,--salt=SALT"
//usage: )
//usage: IF_NOT_LONG_OPTS(
@@ -92,11 +92,9 @@ to cryptpw. -a option (alias for -m) came from cryptpw.
int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int cryptpw_main(int argc UNUSED_PARAM, char **argv)
{
- /* $N$ + sha_salt_16_bytes + NUL */
- char salt[3 + 16 + 1];
+ char salt[MAX_PW_SALT_LEN];
char *salt_ptr;
const char *opt_m, *opt_S;
- int len;
int fd;
#if ENABLE_LONG_OPTS
@@ -121,24 +119,9 @@ int cryptpw_main(int argc UNUSED_PARAM, char **argv)
if (argv[0] && !opt_S)
opt_S = argv[1];
- len = 2/2;
- salt_ptr = salt;
- if (opt_m[0] != 'd') { /* not des */
- len = 8/2; /* so far assuming md5 */
- *salt_ptr++ = '$';
- *salt_ptr++ = '1';
- *salt_ptr++ = '$';
-#if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
- if (opt_m[0] == 's') { /* sha */
- salt[1] = '5' + (strcmp(opt_m, "sha512") == 0);
- len = 16/2;
- }
-#endif
- }
+ salt_ptr = crypt_make_pw_salt(salt, opt_m);
if (opt_S)
- safe_strncpy(salt_ptr, opt_S, sizeof(salt) - 3);
- else
- crypt_make_salt(salt_ptr, len, 0);
+ safe_strncpy(salt_ptr, opt_S, sizeof(salt) - (sizeof("$N$")-1));
xmove_fd(fd, STDIN_FILENO);
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index 810644e..8c47e65 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -9,7 +9,7 @@
//usage: "Change USER's password. If no USER is specified,\n"
//usage: "changes the password for the current user.\n"
//usage: "\nOptions:"
-//usage: "\n -a ALG Algorithm to use for password (des, md5)" /* ", sha1)" */
+//usage: "\n -a ALG Encryption method"
//usage: "\n -d Delete password for the account"
//usage: "\n -l Lock (disable) account"
//usage: "\n -u Unlock (re-enable) account"
@@ -22,15 +22,15 @@ static void nuke_str(char *str)
if (str) memset(str, 0, strlen(str));
}
-static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
+static char* new_password(const struct passwd *pw, uid_t myuid, const char *algo)
{
- char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
+ char salt[MAX_PW_SALT_LEN];
char *orig = (char*)"";
char *newp = NULL;
char *cp = NULL;
char *ret = NULL; /* failure so far */
- if (myuid && pw->pw_passwd[0]) {
+ if (myuid != 0 && pw->pw_passwd[0]) {
char *encrypted;
orig = bb_ask_stdin("Old password: "); /* returns ptr to static */
@@ -38,13 +38,13 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
goto err_ret;
encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
if (strcmp(encrypted, pw->pw_passwd) != 0) {
- syslog(LOG_WARNING, "incorrect password for %s",
- pw->pw_name);
+ syslog(LOG_WARNING, "incorrect password for %s", pw->pw_name);
bb_do_delay(LOGIN_FAIL_DELAY);
puts("Incorrect password");
goto err_ret;
}
- if (ENABLE_FEATURE_CLEAN_UP) free(encrypted);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(encrypted);
}
orig = xstrdup(orig); /* or else bb_ask_stdin() will destroy it */
newp = bb_ask_stdin("New password: "); /* returns ptr to static */
@@ -52,22 +52,22 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
goto err_ret;
newp = xstrdup(newp); /* we are going to bb_ask_stdin() again, so save it */
if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
- && obscure(orig, newp, pw) && myuid)
+ && obscure(orig, newp, pw)
+ && myuid != 0
+ ) {
goto err_ret; /* non-root is not allowed to have weak passwd */
+ }
cp = bb_ask_stdin("Retype password: ");
if (!cp)
goto err_ret;
- if (strcmp(cp, newp)) {
+ if (strcmp(cp, newp) != 0) {
puts("Passwords don't match");
goto err_ret;
}
- crypt_make_salt(salt, 1, 0); /* des */
- if (algo) { /* MD5 */
- strcpy(salt, "$1$");
- crypt_make_salt(salt + 3, 4, 0);
- }
+ crypt_make_pw_salt(salt, algo);
+
/* pw_encrypt returns malloced str */
ret = pw_encrypt(newp, salt, 1);
/* whee, success! */
@@ -75,8 +75,10 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
err_ret:
nuke_str(orig);
if (ENABLE_FEATURE_CLEAN_UP) free(orig);
+
nuke_str(newp);
if (ENABLE_FEATURE_CLEAN_UP) free(newp);
+
nuke_str(cp);
return ret;
}
@@ -85,17 +87,15 @@ int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int passwd_main(int argc UNUSED_PARAM, char **argv)
{
enum {
- OPT_algo = 0x1, /* -a - password algorithm */
- OPT_lock = 0x2, /* -l - lock account */
- OPT_unlock = 0x4, /* -u - unlock account */
- OPT_delete = 0x8, /* -d - delete password */
- OPT_lud = 0xe,
- STATE_ALGO_md5 = 0x10,
- //STATE_ALGO_des = 0x20, not needed yet
+ OPT_algo = (1 << 0), /* -a - password algorithm */
+ OPT_lock = (1 << 1), /* -l - lock account */
+ OPT_unlock = (1 << 2), /* -u - unlock account */
+ OPT_delete = (1 << 3), /* -d - delete password */
+ OPT_lud = OPT_lock | OPT_unlock | OPT_delete,
};
unsigned opt;
int rc;
- const char *opt_a = "";
+ const char *opt_a = "d"; /* des */
const char *filename;
char *myname;
char *name;
@@ -116,13 +116,9 @@ int passwd_main(int argc UNUSED_PARAM, char **argv)
//argc -= optind;
argv += optind;
- if (strcasecmp(opt_a, "des") != 0) /* -a */
- opt |= STATE_ALGO_md5;
- //else
- // opt |= STATE_ALGO_des;
myuid = getuid();
/* -l, -u, -d require root priv and username argument */
- if ((opt & OPT_lud) && (myuid || !argv[0]))
+ if ((opt & OPT_lud) && (myuid != 0 || !argv[0]))
bb_show_usage();
/* Will complain and die if username not found */
@@ -130,7 +126,7 @@ int passwd_main(int argc UNUSED_PARAM, char **argv)
name = argv[0] ? argv[0] : myname;
pw = xgetpwnam(name);
- if (myuid && pw->pw_uid != myuid) {
+ if (myuid != 0 && pw->pw_uid != myuid) {
/* LOGMODE_BOTH */
bb_error_msg_and_die("%s can't change password for %s", myname, name);
}
@@ -164,27 +160,29 @@ int passwd_main(int argc UNUSED_PARAM, char **argv)
newp = NULL;
c = pw->pw_passwd[0] - '!';
if (!(opt & OPT_lud)) {
- if (myuid && !c) { /* passwd starts with '!' */
+ if (myuid != 0 && !c) { /* passwd starts with '!' */
/* LOGMODE_BOTH */
bb_error_msg_and_die("can't change "
"locked password for %s", name);
}
printf("Changing password for %s\n", name);
- newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
+ newp = new_password(pw, myuid, opt_a);
if (!newp) {
logmode = LOGMODE_STDIO;
bb_error_msg_and_die("password for %s is unchanged", name);
}
} else if (opt & OPT_lock) {
- if (!c) goto skip; /* passwd starts with '!' */
+ if (!c)
+ goto skip; /* passwd starts with '!' */
newp = xasprintf("!%s", pw->pw_passwd);
} else if (opt & OPT_unlock) {
- if (c) goto skip; /* not '!' */
+ if (c)
+ goto skip; /* not '!' */
/* pw->pw_passwd points to static storage,
* strdup'ing to avoid nasty surprizes */
newp = xstrdup(&pw->pw_passwd[1]);
} else if (opt & OPT_delete) {
- newp = (char*)""; //xstrdup("");
+ newp = (char*)"";
}
rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
@@ -202,7 +200,7 @@ int passwd_main(int argc UNUSED_PARAM, char **argv)
rc = update_passwd(bb_path_shadow_file, name, newp, NULL);
if (rc > 0)
/* password in /etc/shadow was updated */
- newp = (char*) "x"; //xstrdup("x");
+ newp = (char*) "x";
if (rc >= 0)
/* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
#endif
@@ -212,16 +210,17 @@ int passwd_main(int argc UNUSED_PARAM, char **argv)
}
/* LOGMODE_BOTH */
if (rc < 0)
- bb_error_msg_and_die("can't update password file %s",
- filename);
+ bb_error_msg_and_die("can't update password file %s", filename);
bb_info_msg("Password for %s changed by %s", name, myname);
- //if (ENABLE_FEATURE_CLEAN_UP) free(newp);
+ /*if (ENABLE_FEATURE_CLEAN_UP) free(newp); - can't, it may be non-malloced */
skip:
if (!newp) {
bb_error_msg_and_die("password for %s is already %slocked",
name, (opt & OPT_unlock) ? "un" : "");
}
- if (ENABLE_FEATURE_CLEAN_UP) free(myname);
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(myname);
return 0;
}
diff --git a/networking/httpd.c b/networking/httpd.c
index d6157ac..d77342a 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -2424,7 +2424,7 @@ int httpd_main(int argc UNUSED_PARAM, char **argv)
salt[0] = '$';
salt[1] = '1';
salt[2] = '$';
- crypt_make_salt(salt + 3, 4, 0);
+ crypt_make_salt(salt + 3, 4);
puts(pw_encrypt(pass, salt, 1));
return 0;
}