Initial checkin

1 files changed, 474 insertions, 0 deletions

diff --git a/utils/addauth.c b/utils/addauth.c
new file mode 100644
index 00000000..b200ec9f
--- /dev/null
+++ b/utils/addauth.c
@@ -0,0 +1,474 @@
+/* Add a user to some process(es)
+
+   Copyright (C) 1997 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* XXX NOTE: This program is a real hack job, with large chunks of code cut
+   out of ps and login; the code should be shared in some fashion instead. */
+
+#include <hurd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <argp.h>
+#include <pwd.h>
+#include <grp.h>
+#include <idvec.h>
+#include <ps.h>
+#include <error.h>
+#include <version.h>
+
+#include "psout.h"
+
+const char *argp_program_version = STANDARD_HURD_VERSION (ps);
+
+#define OA OPTION_ARG_OPTIONAL
+
+static const struct argp_option options[] =
+{
+  {0,0,0,0, "Which ids to add:"},
+  {"user",	'u', "USER",  0, "Add USER to the effective uids"},
+  {"avail-user",'U', "USER",  0, "Add USER to the available uids"},
+  {"group",     'g', "GROUP", 0, "Add GROUP to the effective groups"},
+  {"avail-group",'G',"GROUP", 0, "Add GROUP to the available groups"},
+
+  {0,0,0,0, "Whic processes to add to:"},
+  {"login",      'L',     "LID", OA, "Processes from the login"
+                                      " collection LID (which defaults that of"
+                                      " the current process)"},
+  {"lid",        0,       0,      OPTION_ALIAS | OPTION_HIDDEN},
+  {"pid",        'p',     "PID",  0,  "The process PID"},
+  {"pgrp",       'P',     "PGRP", 0,  "Processes in process group PGRP"},
+  {"session",    'S',     "SID",  OA, "Processes from the session SID"
+                                      " (which defaults to the sid of the"
+                                      " current process)"},
+  {"sid",        0,       0,      OPTION_ALIAS | OPTION_HIDDEN},
+  {0, 0}
+};
+
+char *args_doc = "USER...";
+char *doc =
+"Add USER to the userids of the selected processes"
+"\vBy default, all processes in the current login collection are selected";
+
+/* For each string in the comma-separated list in ARG, call ADD_FN; if ARG is
+   empty and DEFAULT_ADD_FN isn't NULL, then call DEFAULT_ADD_FN instead. */
+static void
+_parse_strlist (char *arg,
+		void (*add_fn)(const char *str), void (*default_add_fn)(),
+		const char *type_name)
+{
+  if (arg)
+    while (isspace(*arg))
+      arg++;
+
+  if (arg == NULL || *arg == '\0')
+    if (default_add_fn)
+      (*default_add_fn)();
+    else
+      error(7, 0, "Empty %s list", type_name);
+  else
+    {
+      char *end = arg;
+
+      void mark_end()
+	{
+	  *end++ = '\0';
+	  while (isspace(*end))
+	    end++;
+	}
+      void parse_element()
+	{
+	  if (*arg == '\0')
+	    error(7, 0, "Empty element in %s list", type_name);
+	  (*add_fn)(arg);
+	  arg = end;
+	}
+
+      while (*end != '\0')
+	switch (*end)
+	  {
+	  case ' ': case '\t':
+	    mark_end();
+	    if (*end == ',')
+	      mark_end();
+	    parse_element();
+	    break;
+	  case ',':
+	    mark_end();
+	    parse_element();
+	    break;
+	  default:
+	    end++;
+	  }
+
+      parse_element();
+    }
+}
+
+/* For each numeric string in the comma-separated list in ARG, call ADD_FN;
+   if ARG is empty and DEFAULT_FN isn't NULL, then call DEF_FN to get a number,
+   and call ADD_FN on that, otherwise signal an error.  If any member of the
+   list isn't a number, and LOOKUP_FN isn't NULL, then it is called to return
+   an integer for the string.  LOOKUP_FN should signal an error itself it
+   there's some problem parsing the string.  */
+static void
+parse_numlist (char *arg,
+	       void (*add_fn)(unsigned num),
+	       int (*default_fn)(),
+	       int (*lookup_fn)(const char *str),
+	       const char *type_name)
+{
+  void default_num_add() { (*add_fn)((*default_fn)()); }
+  void add_num_str(const char *str)
+    {
+      const char *p;
+      for (p = str; *p != '\0'; p++)
+	if (!isdigit(*p))
+	  {
+	    if (lookup_fn)
+	      (*add_fn)((*lookup_fn)(str));
+	    else
+	      error (7, 0, "%s: Invalid %s", p, type_name);
+	    return;
+	  }
+      (*add_fn)(atoi(str));
+    }
+  _parse_strlist(arg, add_num_str, default_fn ? default_num_add : 0,
+		 type_name);
+}
+
+static process_t proc_server;
+
+/* Returns our session id.  */
+static pid_t
+current_sid()
+{
+  pid_t sid;
+  error_t err = proc_getsid(proc_server, getpid(), &sid);
+  if (err)
+    error(2, err, "Couldn't get current session id");
+  return sid;
+}
+
+/* Returns our login collection id.  */
+static pid_t
+current_lid()
+{
+  pid_t lid;
+  error_t err = proc_getloginid(proc_server, getpid(), &lid);
+  if (err)
+    error(2, err, "Couldn't get current login collection") ;
+  return lid;
+}
+
+/* Returns the UID for the user called NAME.  */
+static int
+lookup_user(const char *name)
+{
+  struct passwd *pw = getpwnam(name);
+  if (pw == NULL)
+    error(2, 0, "%s: Unknown user", name);
+  return pw->pw_uid;
+}
+
+void 
+main (int argc, char *argv[])
+{
+int i;
+  error_t err;
+  struct proc_stat_list *procset;
+  struct ps_context *context;
+  struct idvec *eff_uids = make_idvec (); /* The UIDs of the new shell.  */
+  struct idvec *eff_gids = make_idvec (); /* The EFF_GIDs.  */
+  struct idvec *avail_uids = make_idvec (); /* The aux UIDs of the new shell.  */
+  struct idvec *avail_gids = make_idvec (); /* The aux EFF_GIDs.  */
+  struct idvec *parent_uids = make_idvec (); /* Parent uids, -SETUID. */
+  struct idvec *parent_gids = make_idvec (); /* Parent gids, -SETGID. */
+  auth_t auth, parent_auth = getauth ();
+
+  /* Add a specific process to be printed out.  */
+  void add_pid (unsigned pid)
+    {
+      struct proc_stat *ps;
+
+      err = proc_stat_list_add_pid (procset, pid, &ps);
+      if (err)
+	error (2, err, "%d: Cannot add process", pid);
+
+      /* See if this process actually exists.  */
+      proc_stat_set_flags (ps, PSTAT_PROC_INFO);
+      if (! proc_stat_has (ps, PSTAT_PROC_INFO))
+	error (99, 0, "%d: Unknown process", pid);
+    }
+  /* Print out all process from the given session.  */
+  void add_sid(unsigned sid)
+    {
+      err = proc_stat_list_add_session (procset, sid, 0, 0);
+      if (err)
+	error(2, err, "%u: Cannot add session", sid);
+    }
+  /* Print out all process from the given login collection.  */
+  void add_lid(unsigned lid)
+    {
+      error_t err = proc_stat_list_add_login_coll (procset, lid, 0, 0);
+      if (err)
+	error(2, err, "%u: Cannot add login collection", lid);
+    }
+  /* Print out all process from the given process group.  */
+  void add_pgrp(unsigned pgrp)
+    {
+      error_t err = proc_stat_list_add_pgrp (procset, pgrp, 0, 0);
+      if (err)
+	error(2, err, "%u: Cannot add process group", pgrp);
+    }
+
+  /* Make sure that the parent_[ug]ids are filled in.  To make them useful
+     for su'ing, each is the avail ids with all effective ids but the first
+     appended; this gets rid of the effect of login being suid, and is useful
+     as the new process's avail id list (e.g., the real id is right).   */
+  void need_parent_ids ()
+    {
+      if (parent_uids->num == 0 && parent_gids->num == 0)
+	{
+	  struct idvec *p_eff_uids = make_idvec ();
+	  struct idvec *p_eff_gids = make_idvec ();
+	  if (!p_eff_uids || !p_eff_gids)
+	    err = ENOMEM;
+	  if (! err)
+	    err = idvec_merge_auth (p_eff_uids, parent_uids,
+				    p_eff_gids, parent_gids,
+				    parent_auth);
+	  if (! err)
+	    {
+	      idvec_delete (p_eff_uids, 0); /* Counteract setuid. */
+	      idvec_delete (p_eff_gids, 0);
+	      err = idvec_merge (parent_uids, p_eff_uids);
+	      if (! err)
+		err = idvec_merge (parent_gids, p_eff_gids);
+	    }
+	  if (err)
+	    error (39, err, "Cannot get uids");
+	}
+    }
+
+  /* Returns true if the *caller* of this login program has UID.  */
+  int parent_has_uid (uid_t uid)
+    {
+      need_parent_ids ();
+      return idvec_contains (parent_uids, uid);
+    }
+  /* Returns true if the *caller* of this login program has GID.  */
+  int parent_has_gid (gid_t gid)
+    {
+      need_parent_ids ();
+      return idvec_contains (parent_gids, gid);
+    }
+  /* Returns the number of parent uids.  */
+  int count_parent_uids ()
+    {
+      need_parent_ids ();
+      return parent_uids->num;
+    }
+  /* Returns the number of parent gids.  */
+  int count_parent_gids ()
+    {
+      need_parent_ids ();
+      return parent_gids->num;
+    }
+
+  /* Make sure the user should be allowed to do this.  */
+  void verify_passwd (const char *name, const char *password,
+		      uid_t id, int is_group)
+    {
+      extern char *crypt (const char *string, const char salt[2]);
+#ifndef HAVE_CRYPT
+#pragma weak crypt
+#endif
+      char *prompt, *unencrypted, *encrypted;
+
+      if (!password || !*password
+	  || idvec_contains (is_group ? eff_gids : eff_uids, id)
+	  || idvec_contains (is_group ? avail_gids : avail_uids, id)
+	  || parent_has_uid (0)
+	  || (is_group ? parent_has_uid (id) : parent_has_gid (id)))
+	return;			/* Already got this one.  */
+
+      if (name)
+	asprintf (&prompt, "Password for %s%s:",
+		  is_group ? "group " : "", name);
+      else
+	prompt = "Password:";
+
+      unencrypted = getpass (prompt);
+      if (name)
+	free (prompt);
+
+      if (crypt)
+	{
+	  encrypted = crypt (unencrypted, password);
+	  /* Paranoia may destroya.  */
+	  memset (unencrypted, 0, strlen (unencrypted));
+
+	  if (! encrypted)
+	    /* Something went wrong.  */
+	    error (51, errno, "Password encryption failed");
+	}
+      else
+	encrypted = unencrypted;
+
+      if (strcmp (encrypted, password) == 0)
+	return;			/* password O.K. */
+
+      if (id == 0 && !is_group && parent_has_gid (0) && parent_uids->num > 0
+	  && parent_uids->ids[0] != 0)
+	/* Special hack: a user attempting to gain root access can use
+	   their own password (instead of root's) if they're in group 0. */
+	{
+	  struct passwd *pw = getpwuid (parent_uids->ids[0]);
+	  if (pw && strcmp (encrypted, pw->pw_passwd) == 0)
+	    return;
+	}
+
+      error (50, 0, "Incorrect password");
+    }
+
+  error_t parse_opt (int key, char *arg, struct argp_state *state)
+    {
+      switch (key)
+	{
+	case 'p':
+	  parse_numlist(arg, add_pid, NULL, NULL, "process id");
+	  break;
+	case 'S':
+	  parse_numlist(arg, add_sid, current_sid, NULL, "session id");
+	  break;
+	case 'L':
+	  parse_numlist(arg, add_lid, current_lid, NULL, "login collection");
+	  break;
+	case 'P':
+	  parse_numlist(arg, add_pgrp, NULL, NULL, "process group");
+	  break;
+
+	case 'u':
+	case 'U':
+	case ARGP_KEY_ARG:
+	  {
+	    struct passwd *pw =
+	      isdigit (*arg) ? getpwuid (atoi (arg)) : getpwnam (arg);
+	    /* True if this is the user arg and there were no user options. */
+	    int only_user =
+	      (key == ARGP_KEY_ARG
+	       && eff_uids->num == 0 && avail_uids->num <= count_parent_uids ()
+	       && eff_gids->num == 0 && avail_gids->num <= count_parent_gids ());
+
+	    if (! pw)
+	      argp_failure (state, 10, 0, "%s: Unknown user", arg);
+
+	    /* If it's not nobody, make sure we're authorized.  */
+	    verify_passwd (only_user ? 0 : pw->pw_name, pw->pw_passwd,
+			   pw->pw_uid, 0);
+
+	    if (key == 'U')
+	      /* Add available ids instead of effective ones.  */
+	      idvec_add_new (avail_uids, pw->pw_uid);
+	    else
+	      idvec_add_new (eff_uids, pw->pw_uid);
+	  }
+	  break;
+
+	case 'g':
+	case 'G':
+	  {
+	    struct group *gr =
+	      isdigit (*arg) ? getgrgid (atoi (arg)) : getgrnam (arg);
+	    if (! gr)
+	      argp_failure (state, 11, 0, "%s: Unknown group", arg);
+	    verify_passwd (gr->gr_name, gr->gr_passwd, gr->gr_gid, 1);
+	    idvec_add_new (key == 'g' ? eff_gids : avail_gids, gr->gr_gid);
+	  }
+	  break;
+
+	default:
+	  return ARGP_ERR_UNKNOWN;
+	}
+      return 0;
+    }
+  error_t frob_proc (struct proc_stat *ps)
+    {
+ printf ("Frobbing pid %d\n", ps->pid);
+      if (! (ps->flags & PSTAT_MSGPORT))
+	error (0, 0, "%d: Cannot get message port", ps->pid);
+      else
+	{
+	  error_t err = msg_add_auth (ps->msgport, auth);
+	  if (err)
+	    error (0, err, "%d: Cannot add authentication", ps->pid);
+	}
+      return 0;
+    }
+
+  struct argp argp = { options, parse_opt, args_doc, doc};
+
+  proc_server = getproc();
+
+  err = ps_context_create (proc_server, &context);
+  if (err)
+    error(1, err, "ps_context_create");
+
+  err = proc_stat_list_create(context, &procset);
+  if (err)
+    error(1, err, "proc_stat_list_create");
+
+  /* Parse our command line.  This shouldn't ever return an error.  */
+  argp_parse (&argp, argc, argv, 0, 0, 0);
+
+  if (procset->num_procs == 0)
+    /* By default, do the current login collection.  */
+    add_lid (current_lid ());
+
+ printf ("Adding euids:");
+ for (i = 0; i < eff_uids->num; i++) printf (" %d", eff_uids->ids[i]);
+ putchar ('\n');
+ printf ("Adding egids:");
+ for (i = 0; i < eff_gids->num; i++) printf (" %d", eff_gids->ids[i]);
+ putchar ('\n');
+ printf ("Adding auids:");
+ for (i = 0; i < avail_uids->num; i++) printf (" %d", avail_uids->ids[i]);
+ putchar ('\n');
+ printf ("Adding agids:");
+ for (i = 0; i < avail_gids->num; i++) printf (" %d", avail_gids->ids[i]);
+ putchar ('\n');
+  err =
+    auth_makeauth (getauth (), 0, MACH_MSG_TYPE_COPY_SEND, 0,
+		   eff_uids->ids, eff_uids->num,
+		   avail_uids->ids, avail_uids->num,
+		   eff_gids->ids, eff_gids->num,
+		   avail_gids->ids, avail_gids->num,
+		   &auth);
+  if (err)
+    error (3, err, "Authentication failure");
+
+  proc_stat_list_set_flags (procset, PSTAT_TASK | PSTAT_MSGPORT);
+  proc_stat_list_for_each (procset, frob_proc);
+
+  exit (0);
+}