httpd: add -u user[:grp] support

e2fsprogs/ext2fs/version.c

@@ -20,8 +20,6 @@
 #include "ext2_fs.h"
 #include "ext2fs.h"
 
-//#include "../../version.h"
-
 static const char *lib_version = E2FSPROGS_VERSION;
 static const char *lib_date = E2FSPROGS_DATE;
 

include/libbb.h

@@ -291,6 +291,13 @@ extern char *bb_getug(char *buffer, char *idname, long id, int bufsize, char pre
 extern char *bb_getpwuid(char *name, long uid, int bufsize);
 extern char *bb_getgrgid(char *group, long gid, int bufsize);
 extern char *bb_askpass(int timeout, const char * prompt);
+/* from chpst */
+struct bb_uidgid_t {
+        uid_t uid;
+        gid_t gid;
+};
+extern unsigned uidgid_get(struct bb_uidgid_t*, const char* /*, unsigned*/);
+
 
 extern int device_open(const char *device, int mode);
 

include/usage.h

@@ -1167,7 +1167,7 @@ USE_FEATURE_DATE_ISOFMT( \
 #define httpd_trivial_usage \
 	"[-c <conf file>]" \
 	USE_FEATURE_HTTPD_WITHOUT_INETD(" [-p <port>]") \
-	USE_FEATURE_HTTPD_SETUID(" [-u user]") \
+	USE_FEATURE_HTTPD_SETUID(" [-u user[:grp]]") \
 	USE_FEATURE_HTTPD_BASIC_AUTH(" [-r <realm>]") \
 	USE_FEATURE_HTTPD_AUTH_MD5(" [-m pass]") \
 	" [-h home]" \
@@ -1176,12 +1176,12 @@ USE_FEATURE_DATE_ISOFMT( \
 	"Listens for incoming http server requests.\n\n" \
 	"Options:\n" \
 	"\t-c FILE\t\tSpecifies configuration file. (default httpd.conf)\n" \
-	USE_FEATURE_HTTPD_WITHOUT_INETD("\t-p PORT\tServer port (default 80)\n") \
+	USE_FEATURE_HTTPD_WITHOUT_INETD("\t-p PORT\t\tServer port (default 80)\n") \
-	USE_FEATURE_HTTPD_SETUID("\t-u USER\tSet uid to USER after listening privileges port\n") \
+	USE_FEATURE_HTTPD_SETUID("\t-u USER[:GRP]\tSet uid/gid after binding to port\n") \
 	USE_FEATURE_HTTPD_BASIC_AUTH("\t-r REALM\tAuthentication Realm for Basic Authentication\n") \
 	USE_FEATURE_HTTPD_AUTH_MD5("\t-m PASS\t\tCrypt PASS with md5 algorithm\n") \
-	"\t-h HOME  \tSpecifies http HOME directory (default ./)\n" \
+	"\t-h HOME\t\tSpecifies http HOME directory (default ./)\n" \
-	"\t-e STRING\tHtml encode STRING\n" \
+	"\t-e STRING\tHTML encode STRING\n" \
 	"\t-d STRING\tURL decode STRING"
 
 #define hwclock_trivial_usage \

libbb/safe_strncpy.c

@@ -15,6 +15,7 @@
 /* Like strncpy but make sure the resulting string is always 0 terminated. */
 char * safe_strncpy(char *dst, const char *src, size_t size)
 {
-	dst[size-1] = '\0';
+	if (!size) return dst;
-	return strncpy(dst, src, size-1);
+	dst[--size] = '\0';
+	return strncpy(dst, src, size);
 }

libpwdgrp/Kbuild

@@ -4,4 +4,4 @@
 #
 # Licensed under the GPL v2, see the file LICENSE in this tarball.
 
-lib-y:=pwd_grp.o
+lib-y:=pwd_grp.o uidgid_get.o

libpwdgrp/uidgid_get.c

@@ -0,0 +1,49 @@
+#include "busybox.h"
+
+unsigned uidgid_get(struct bb_uidgid_t *u, const char *ug /*, unsigned dogrp */)
+{
+	struct passwd *pwd;
+	struct group *gr;
+	const char *g;
+
+	/* g = 0; if (dogrp) g = strchr(ug, ':'); */
+	g = strchr(ug, ':');
+	if (g) {
+		int sz = (++g) - ug;
+		char buf[sz];
+		safe_strncpy(buf, ug, sz);
+		pwd = getpwnam(buf);
+	} else
+		pwd = getpwnam(ug);
+	if (!pwd)
+		return 0;
+	u->uid = pwd->pw_uid;
+	u->gid = pwd->pw_gid;
+	if (g) {
+		gr = getgrnam(g);
+		if (!gr) return 0;
+		u->gid = gr->gr_gid;
+	}
+	return 1;
+}
+
+#if 0
+#include <stdio.h>
+int main()
+{
+	unsigned u;
+	struct bb_uidgid_t ug;
+	u = uidgid_get(&ug, "apache");
+	printf("%u = %u:%u\n", u, ug.uid, ug.gid);
+	ug.uid = ug.gid = 1111;
+	u = uidgid_get(&ug, "apache");
+	printf("%u = %u:%u\n", u, ug.uid, ug.gid);
+	ug.uid = ug.gid = 1111;
+	u = uidgid_get(&ug, "apache:users");
+	printf("%u = %u:%u\n", u, ug.uid, ug.gid);
+	ug.uid = ug.gid = 1111;
+	u = uidgid_get(&ug, "apache:users");
+	printf("%u = %u:%u\n", u, ug.uid, ug.gid);
+	return 0;
+}
+#endif

networking/httpd.c

@@ -1916,8 +1916,8 @@ int httpd_main(int argc, char *argv[])
 	USE_FEATURE_HTTPD_WITHOUT_INETD(const char *s_port;)
 	USE_FEATURE_HTTPD_WITHOUT_INETD(int server;)
 
-	USE_FEATURE_HTTPD_SETUID(const char *s_uid;)
+	USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
-	USE_FEATURE_HTTPD_SETUID(long uid = -1;)
+	USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
 
 	USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
 
@@ -1937,7 +1937,7 @@ int httpd_main(int argc, char *argv[])
 			USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
 			USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm))
 			USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
-			USE_FEATURE_HTTPD_SETUID(, &s_uid)
+			USE_FEATURE_HTTPD_SETUID(, &s_ugid)
 			USE_FEATURE_HTTPD_WITHOUT_INETD(, &s_port)
 		);
 
@@ -1963,11 +1963,18 @@ int httpd_main(int argc, char *argv[])
 #if ENABLE_FEATURE_HTTPD_SETUID
 	if (opt & OPT_SETUID) {
 		char *e;
-
+		// FIXME: what the default group should be?
-		uid = strtol(s_uid, &e, 0);
+		ugid.gid = -1;
+		ugid.uid = strtoul(s_ugid, &e, 0);
+		if (*e == ':') {
+			e++;
+			ugid.gid = strtoul(e, &e, 0);
+		}
 		if (*e != '\0') {
 			/* not integer */
-			uid = bb_xgetpwnam(s_uid);
+			if (!uidgid_get(&ugid, s_ugid))
+				bb_error_msg_and_die("unrecognized user[:group] "
+						"name '%s'", s_ugid);
 		}
 	}
 #endif
@@ -1978,8 +1985,15 @@ int httpd_main(int argc, char *argv[])
 	server = openServer();
 # ifdef CONFIG_FEATURE_HTTPD_SETUID
 	/* drop privileges */
-	if (uid > 0)
+	if (opt & OPT_SETUID) {
-		xsetuid(uid);
+		if (ugid.gid != (gid_t)-1) {
+			// FIXME: needed?
+			//if (setgroups(1, &ugid.gid) == -1)
+            		//	bb_perror_msg_and_die("setgroups");
+			xsetgid(ugid.gid);
+		}
+		xsetuid(ugid.uid);
+	}
 # endif
 #endif
 

runit/Kbuild

@@ -5,4 +5,4 @@
 # Licensed under the GPL v2, see the file LICENSE in this tarball.
 
 lib-y:=
-lib-$(CONFIG_CHPST) += chpst.o uidgid.o
+lib-$(CONFIG_CHPST) += chpst.o

runit/chpst.c

@@ -1,16 +1,9 @@
 #include "busybox.h"
 
-#include <sys/types.h>
-#include <sys/resource.h>
-#include <grp.h>
-
-#include "uidgid.h"
-
-#include <sys/types.h>
 #include <dirent.h>
 
 static unsigned option_mask;
-// Must meatch constants in chpst_main!
+// Must match constants in chpst_main!
 #define OPT_verbose  (option_mask & 0x2000)
 #define OPT_pgrp     (option_mask & 0x4000)
 #define OPT_nostdin  (option_mask & 0x8000)
@@ -33,34 +26,27 @@ static long limitt = -2;
 static long nicelvl;
 static const char *root;
 
-static void suidgid(char *user, unsigned dogrp)
+static void suidgid(char *user)
 {
-	struct uidgid ugid;
+	struct bb_uidgid_t ugid;
 
-	if (!uidgid_get(&ugid, user, dogrp)) {
+	if (!uidgid_get(&ugid, user)) {
-		if (dogrp)
 		bb_error_msg_and_die("unknown user/group: %s", user);
-		else
-			bb_error_msg_and_die("unknown account: %s", user);
 	}
-	if (setgroups(ugid.gids, ugid.gid) == -1)
+	if (setgroups(1, &ugid.gid) == -1)
 		bb_perror_msg_and_die("setgroups");
-	xsetgid(*ugid.gid);
+	xsetgid(ugid.gid);
 	xsetuid(ugid.uid);
 }
 
-static void euidgid(char *user, unsigned dogrp)
+static void euidgid(char *user)
 {
-	struct uidgid ugid;
+	struct bb_uidgid_t ugid;
 
-	if (!uidgid_get(&ugid, user, dogrp)) {
+	if (!uidgid_get(&ugid, user)) {
-		if (dogrp)
 		bb_error_msg_and_die("unknown user/group: %s", user);
-		else
-			bb_error_msg_and_die("unknown account: %s", user);
 	}
-	//FIXME: ultoa needed here!
+	xsetenv("GID", utoa(ugid.gid));
-	xsetenv("GID", utoa(*ugid.gid));
 	xsetenv("UID", utoa(ugid.uid));
 }
 
@@ -276,8 +262,8 @@ int chpst_main(int argc, char **argv)
 		if (nice(nicelvl) == -1)
 			bb_perror_msg_and_die("nice");
 	}
-	if (env_user) euidgid(env_user, 1);
+	if (env_user) euidgid(env_user);
-	if (set_user) suidgid(set_user, 1);
+	if (set_user) suidgid(set_user);
 	if (OPT_nostdin) close(0);
 	if (OPT_nostdout) close(1);
 	if (OPT_nostderr) close(2);
@@ -292,7 +278,7 @@ static void setuidgid(int argc, char **argv)
 	account = *++argv;
 	if (!account) bb_show_usage();
 	if (!*++argv) bb_show_usage();
-	suidgid((char*)account, 0);
+	suidgid((char*)account);
 	execvp(argv[0], argv);
 	bb_perror_msg_and_die("exec %s", argv[0]);
 }
@@ -304,7 +290,7 @@ static void envuidgid(int argc, char **argv)
 	account = *++argv;
 	if (!account) bb_show_usage();
 	if (!*++argv) bb_show_usage();
-	euidgid((char*)account, 0);
+	euidgid((char*)account);
 	execvp(argv[0], argv);
 	bb_perror_msg_and_die("exec %s", argv[0]);
 }

runit/uidgid.c

@@ -1,63 +0,0 @@
-#include <sys/types.h>
-#include <pwd.h>
-#include <grp.h>
-#include "uidgid.h"
-
-static unsigned str_chr(const char *s, int c)
-{
-	const char *t = s;
-	while (t[0] && t[0] != (char)c)
-		t++;
-	return t - s;
-}
-
-
-unsigned uidgid_get(struct uidgid *u, char *ug, unsigned dogrp) {
-	char *g = 0;
-	struct passwd *pwd = 0;
-	struct group *gr = 0;
-	int i, d = 0;
-
-	if (dogrp)
-		d = str_chr(ug, ':');
-	if (ug[d] == ':') {
-		ug[d] = 0;
-		g = ug + d + 1;
-	}
-	pwd = getpwnam(ug);
-	if (!pwd) {
-		if (g) ug[d] = ':';
-		return 0;
-	}
-	if (g) {
-		ug[d] = ':';
-		for (i = 0; i < 60; ++i) {
-			d = str_chr(g, ':');
-			if (g[d] == ':') {
-				g[d] = 0;
-				gr = getgrnam(g);
-				if (!gr) {
-					g[d] = ':';
-					return 0;
-				}
-				g[d] = ':';
-				u->gid[i] = gr->gr_gid;
-				g += d+1;
-			}
-			else {
-				gr = getgrnam(g);
-				if (!gr) return 0;
-				u->gid[i++] = gr->gr_gid;
-				break;
-			}
-		}
-		u->gid[i] = 0;
-		u->gids = i;
-	}
-	if (!g) {
-		u->gid[0] = pwd->pw_gid;
-		u->gids = 1;
-	}
-	u->uid = pwd->pw_uid;
-	return 1;
-}

runit/uidgid.h

@@ -1,14 +0,0 @@
-#ifndef UIDGID_H
-#define UIDGID_H
-
-#include <sys/types.h>
-
-struct uidgid {
-	uid_t uid;
-	gid_t gid[61];
-	int gids;
-};
-
-extern unsigned uidgid_get(struct uidgid *, char *, unsigned);
-
-#endif