new package: shellinabox

Requested in https://github.com/termux/termux-packages/issues/934.

packages/shellinabox/build.sh

@@ -0,0 +1,18 @@
+TERMUX_PKG_HOMEPAGE=https://github.com/shellinabox/shellinabox
+TERMUX_PKG_DESCRIPTION="Implementation of a web server that can export arbitrary command line tools to a web based terminal emulator"
+TERMUX_PKG_LICENSE="GPL-2.0"
+TERMUX_PKG_VERSION=2.20
+TERMUX_PKG_SRCURL=https://github.com/shellinabox/shellinabox/archive/v$TERMUX_PKG_VERSION.tar.gz
+TERMUX_PKG_SHA256=27a5ec6c3439f87aee238c47cc56e7357a6249e5ca9ed0f044f0057ef389d81e
+TERMUX_PKG_DEPENDS="openssl, openssl-tool, termux-auth (>= 1.2), zlib"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
+--enable-login
+--disable-pam
+--disable-utmp
+--disable-runtime-loading
+"
+
+termux_step_pre_configure() {
+	export LIBS="-lssl -lcrypto"
+	autoreconf -i
+}

packages/shellinabox/shellinabox-2.20_Makefile.am.patch

@@ -0,0 +1,13 @@
+diff -uNr shellinabox-2.20/Makefile.am shellinabox-2.20.mod/Makefile.am
+--- shellinabox-2.20/Makefile.am	2016-11-09 21:40:33.000000000 +0200
++++ shellinabox-2.20.mod/Makefile.am	2020-01-03 01:28:00.029246370 +0200
+@@ -208,8 +208,7 @@
+ 	@rm -f "$@"
+ 	ln "$?" "$@"
+ 
+-shellinaboxd.1: ${top_srcdir}/shellinabox/shellinaboxd.man.in                 \
+-		${top_srcdir}/config.h
++shellinaboxd.1: ${top_srcdir}/shellinabox/shellinaboxd.man.in
+ 	@src="${top_srcdir}/shellinabox/shellinaboxd.man.in";                 \
+ 	echo preprocess  "$$src" '>'"$@";                                     \
+ 	if sed -e 's/^#define \([^ ]*\).*/\1/' -e t -e d config.h |           \

packages/shellinabox/shellinabox-2.20_libhttp_ssl.c.patch

@@ -0,0 +1,12 @@
+diff -uNr shellinabox-2.20/libhttp/ssl.c shellinabox-2.20.mod/libhttp/ssl.c
+--- shellinabox-2.20/libhttp/ssl.c	2016-11-09 21:40:33.000000000 +0200
++++ shellinabox-2.20.mod/libhttp/ssl.c	2020-01-03 01:52:35.381088443 +0200
+@@ -398,7 +398,7 @@
+     check(NOINTR(dup2(fd, STDIN_FILENO)) == STDIN_FILENO);
+     check(NOINTR(close(fd)) == 0);
+     umask(077);
+-    check(setenv("PATH", "/usr/bin:/usr/sbin", 1) == 0);
++    check(setenv("PATH", "@TERMUX_PREFIX@/bin:@TERMUX_PREFIX@/bin/applets", 1) == 0);
+     char *subject;
+     check(subject = stringPrintf(NULL, "/CN=%s/", serverName));
+     if (execlp("openssl", "openssl", "req", "-x509", "-nodes", "-days", "7300",

packages/shellinabox/shellinabox-2.20_shellinabox_launcher.c.patch

@@ -0,0 +1,87 @@
+diff -uNr shellinabox-2.20/shellinabox/launcher.c shellinabox-2.20.mod/shellinabox/launcher.c
+--- shellinabox-2.20/shellinabox/launcher.c	2016-11-09 21:40:33.000000000 +0200
++++ shellinabox-2.20.mod/shellinabox/launcher.c	2020-01-03 01:31:45.220824399 +0200
+@@ -676,10 +676,13 @@
+       // Temporarily regain privileges to update the utmp database
+       uid_t r_uid, e_uid, s_uid;
+       uid_t r_gid, e_gid, s_gid;
++
++#ifndef __ANDROID__
+       check(!getresuid(&r_uid, &e_uid, &s_uid));
+       check(!getresgid(&r_gid, &e_gid, &s_gid));
+       UNUSED_RETURN(setresuid(0, 0, 0));
+       UNUSED_RETURN(setresgid(0, 0, 0));
++#endif
+ 
+       if (enableUtmpLogging) {
+         setutxent();
+@@ -693,10 +696,12 @@
+ #endif
+       }
+ 
++#ifndef __ANDROID__
+       // Switch back to the lower privileges
+       check(!setresgid(r_gid, e_gid, s_gid));
+       check(!setresuid(r_uid, e_uid, s_uid));
+ #endif
++#endif
+ 
+       NOINTR(close(utmp->pty));
+     }
+@@ -1162,8 +1167,7 @@
+ 
+   if (service->useDefaultShell) {
+     check(!service->cmdline);
+-    service->cmdline           = strdup(*pw->pw_shell ?
+-                                        pw->pw_shell : "/bin/sh");
++    service->cmdline           = strdup("@TERMUX_PREFIX@/bin/bash");
+   }
+ 
+   if (restricted &&
+@@ -1231,7 +1235,7 @@
+   (*environment)[numEnvVars++] = stringPrintf(NULL, "SHELL=%s", pw->pw_shell);
+   check(
+   (*environment)[numEnvVars++] = strdup(
+-                              "PATH=/usr/local/bin:/usr/bin:/bin:/usr/games"));
++                              "PATH=@TERMUX_PREFIX@/bin:@TERMUX_PREFIX@/bin/applets"));
+   (*environment)[numEnvVars++] = stringPrintf(NULL, "LOGNAME=%s",
+                                               service->user);
+   (*environment)[numEnvVars++] = stringPrintf(NULL, "USER=%s", service->user);
+@@ -1566,10 +1570,13 @@
+   cfsetospeed(&tt, B38400);
+   tcsetattr(0, TCSAFLUSH, &tt);
+ 
++#ifndef __ANDROID__
+   // Assert root privileges in order to update utmp entry. We can only do that,
+   // if we have root permissions otherwise this fails.
+   UNUSED_RETURN(setresuid(0, 0, 0));
+   UNUSED_RETURN(setresgid(0, 0, 0));
++#endif
++
+ #ifdef HAVE_UTMPX_H
+   if (enableUtmpLogging) {
+     setutxent();
+@@ -1641,9 +1648,11 @@
+ #endif
+   }
+ 
++#ifndef __ANDROID__
+   // Change user and group ids
+   check(!setresgid(service->gid, service->gid, service->gid));
+   check(!setresuid(service->uid, service->uid, service->uid));
++#endif
+ 
+   // Change working directory
+   if (service->useHomeDir) {
+@@ -1682,10 +1691,7 @@
+     snprintf(remoteHost, 256,
+              (*realIP) ? "%s, %s" : "%s%s", peerName,
+              (*realIP) ? realIP : "");
+-    execle("/bin/login", "login", "-p", "-h", remoteHost,
+-           (void *)0, environment);
+-    execle("/usr/bin/login", "login", "-p", "-h", remoteHost,
+-           (void *)0, environment);
++    execle("@TERMUX_PREFIX@/bin/pwlogin", "pwlogin", (void *)0, environment);
+   } else {
+     // Launch user provied service
+     execService(width, height, service, peerName, realIP, environment, url);

packages/shellinabox/shellinabox-2.20_shellinabox_privileges.c.patch

@@ -0,0 +1,57 @@
+diff -uNr shellinabox-2.20/shellinabox/privileges.c shellinabox-2.20.mod/shellinabox/privileges.c
+--- shellinabox-2.20/shellinabox/privileges.c	2016-11-09 21:40:33.000000000 +0200
++++ shellinabox-2.20.mod/shellinabox/privileges.c	2020-01-03 01:34:35.341048035 +0200
+@@ -95,6 +95,10 @@
+ #endif
+ 
+ static void removeGroupPrivileges(int showError) {
++#ifdef __ANDROID__
++  return;
++#endif
++
+   gid_t rg, eg, sg;
+   check(!getresgid(&rg, &eg, &sg));
+ 
+@@ -128,6 +132,10 @@
+ }
+ 
+ void lowerPrivileges(void) {
++#ifdef __ANDROID__
++  return;
++#endif
++
+   uid_t r, e, g;
+   check(!getresuid(&r, &e, &g));
+ 
+@@ -159,6 +167,10 @@
+ }
+ 
+ void dropPrivileges(void) {
++#ifdef __ANDROID__
++  return;
++#endif
++
+   uid_t r, e, s;
+   check(!getresuid(&r, &e, &s));
+ 
+@@ -256,6 +268,10 @@
+ #endif
+ 
+ uid_t getUserId(const char *name) {
++#ifdef __ANDROID__
++  return getuid();
++#endif
++
+   struct passwd pwbuf, *pw;
+   char *buf;
+   #ifdef _SC_GETPW_R_SIZE_MAX
+@@ -364,6 +380,9 @@
+ #endif
+ 
+ gid_t getGroupId(const char *name) {
++#if __ANDROID__
++  return getgid();
++#endif
+   static const long gr_max = 64 * 1024;
+   struct group grbuf, *gr;
+   char *temp;

packages/shellinabox/shellinabox-2.20_shellinabox_service.c.patch

@@ -0,0 +1,35 @@
+diff -uNr shellinabox-2.20/shellinabox/service.c shellinabox-2.20.mod/shellinabox/service.c
+--- shellinabox-2.20/shellinabox/service.c	2016-11-09 21:40:33.000000000 +0200
++++ shellinabox-2.20.mod/shellinabox/service.c	2020-01-03 01:47:07.845623596 +0200
+@@ -94,9 +94,11 @@
+   // The next part of the argument is either the word 'LOGIN' or the
+   // application definition.
+   if (!strcmp(arg, "LOGIN")) {
++#ifndef __ANDROID__
+     if (geteuid()) {
+       fatal("[config] Must be \"root\" to invoke LOGIN service!");
+     }
++#endif
+     service->useLogin                       = 1;
+     service->useHomeDir                     = 0;
+     service->authUser                       = 0;
+@@ -106,8 +108,7 @@
+     check(service->user                     = strdup("root"));
+     check(service->group                    = strdup("root"));
+     check(service->cwd                      = strdup("/"));
+-    check(service->cmdline                  = strdup(
+-                                                  "/bin/login -p -h ${peer}"));
++    check(service->cmdline                  = strdup("@TERMUX_PREFIX@/bin/pwlogin"));
+   } else
+ #endif
+   if (!strcmp(arg, "SSH") || !strncmp(arg, "SSH:", 4)) {
+@@ -175,8 +176,7 @@
+           "-oHostbasedAuthentication=no -oIdentitiesOnly=yes "
+           "-oKbdInteractiveAuthentication=yes -oPasswordAuthentication=yes "
+           "-oPreferredAuthentications=keyboard-interactive,password "
+-          "-oPubkeyAuthentication=no -oRhostsRSAAuthentication=no "
+-          "-oRSAAuthentication=no -oStrictHostKeyChecking=no -oTunnel=no "
++          "-oPubkeyAuthentication=no -oStrictHostKeyChecking=no -oTunnel=no "
+           "-oUserKnownHostsFile=/dev/null -oVerifyHostKeyDNS=no "
+ // beewoolie-2012.03.30: while it would be nice to disable this
+ //          feature, we cannot be sure that it is available on the