mirror of
https://github.com/sudo-project/sudo.git
synced 2025-08-31 22:35:10 +00:00
Rework source layout in preparation for modular sudo.
This commit is contained in:
Todd C. Miller
935
plugins/sudoers/env.c
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935
plugins/sudoers/env.c
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@@ -0,0 +1,935 @@
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/*
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* Copyright (c) 2000-2005, 2007-2009
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* Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <ctype.h>
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#include <errno.h>
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#include <pwd.h>
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#include "sudo.h"
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/*
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* Flags used in rebuild_env()
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*/
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#undef DID_TERM
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#define DID_TERM 0x0001
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#undef DID_PATH
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#define DID_PATH 0x0002
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#undef DID_HOME
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#define DID_HOME 0x0004
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#undef DID_SHELL
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#define DID_SHELL 0x0008
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#undef DID_LOGNAME
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#define DID_LOGNAME 0x0010
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#undef DID_USER
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#define DID_USER 0x0020
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#undef DID_USERNAME
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#define DID_USERNAME 0x0040
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#undef DID_MAX
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#define DID_MAX 0x00ff
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#undef KEPT_TERM
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#define KEPT_TERM 0x0100
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#undef KEPT_PATH
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#define KEPT_PATH 0x0200
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#undef KEPT_HOME
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#define KEPT_HOME 0x0400
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#undef KEPT_SHELL
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#define KEPT_SHELL 0x0800
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#undef KEPT_LOGNAME
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#define KEPT_LOGNAME 0x1000
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#undef KEPT_USER
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#define KEPT_USER 0x2000
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#undef KEPT_USERNAME
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#define KEPT_USERNAME 0x4000
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#undef KEPT_MAX
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#define KEPT_MAX 0xff00
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#undef VNULL
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#define VNULL (void *)NULL
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struct environment {
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char **envp; /* pointer to the new environment */
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size_t env_size; /* size of new_environ in char **'s */
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size_t env_len; /* number of slots used, not counting NULL */
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};
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/*
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* Prototypes
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*/
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void rebuild_env __P((int, int));
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static void sudo_setenv __P((const char *, const char *, int));
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static void sudo_putenv __P((char *, int, int));
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extern char **environ; /* global environment */
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/*
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* Copy of the sudo-managed environment.
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*/
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static struct environment env;
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/*
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* Default table of "bad" variables to remove from the environment.
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* XXX - how to omit TERMCAP if it starts with '/'?
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*/
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static const char *initial_badenv_table[] = {
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"IFS",
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"CDPATH",
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"LOCALDOMAIN",
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"RES_OPTIONS",
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"HOSTALIASES",
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"NLSPATH",
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"PATH_LOCALE",
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"LD_*",
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"_RLD*",
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#ifdef __hpux
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"SHLIB_PATH",
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#endif /* __hpux */
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#ifdef _AIX
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"LDR_*",
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"LIBPATH",
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"AUTHSTATE",
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#endif
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#ifdef __APPLE__
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"DYLD_*",
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#endif
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#ifdef HAVE_KERB4
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"KRB_CONF*",
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"KRBCONFDIR",
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"KRBTKFILE",
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#endif /* HAVE_KERB4 */
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#ifdef HAVE_KERB5
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"KRB5_CONFIG*",
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"KRB5_KTNAME",
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#endif /* HAVE_KERB5 */
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#ifdef HAVE_SECURID
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"VAR_ACE",
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"USR_ACE",
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"DLC_ACE",
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#endif /* HAVE_SECURID */
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"TERMINFO", /* terminfo, exclusive path to terminfo files */
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"TERMINFO_DIRS", /* terminfo, path(s) to terminfo files */
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"TERMPATH", /* termcap, path(s) to termcap files */
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"TERMCAP", /* XXX - only if it starts with '/' */
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"ENV", /* ksh, file to source before script runs */
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"BASH_ENV", /* bash, file to source before script runs */
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"PS4", /* bash, prefix for lines in xtrace mode */
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"GLOBIGNORE", /* bash, globbing patterns to ignore */
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"SHELLOPTS", /* bash, extra command line options */
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"JAVA_TOOL_OPTIONS", /* java, extra command line options */
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"PERLIO_DEBUG ", /* perl, debugging output file */
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"PERLLIB", /* perl, search path for modules/includes */
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"PERL5LIB", /* perl 5, search path for modules/includes */
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"PERL5OPT", /* perl 5, extra command line options */
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"PERL5DB", /* perl 5, command used to load debugger */
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"FPATH", /* ksh, search path for functions */
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"NULLCMD", /* zsh, command for null file redirection */
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"READNULLCMD", /* zsh, command for null file redirection */
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"ZDOTDIR", /* zsh, search path for dot files */
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"TMPPREFIX", /* zsh, prefix for temporary files */
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"PYTHONHOME", /* python, module search path */
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"PYTHONPATH", /* python, search path */
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"PYTHONINSPECT", /* python, allow inspection */
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"RUBYLIB", /* ruby, library load path */
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"RUBYOPT", /* ruby, extra command line options */
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NULL
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};
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/*
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* Default table of variables to check for '%' and '/' characters.
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*/
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static const char *initial_checkenv_table[] = {
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"COLORTERM",
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"LANG",
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"LANGUAGE",
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"LC_*",
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"LINGUAS",
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"TERM",
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NULL
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};
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/*
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* Default table of variables to preserve in the environment.
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*/
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static const char *initial_keepenv_table[] = {
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"COLORS",
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"DISPLAY",
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"HOME",
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"HOSTNAME",
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"KRB5CCNAME",
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"LS_COLORS",
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"MAIL",
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"PATH",
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"PS1",
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"PS2",
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"TZ",
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"XAUTHORITY",
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"XAUTHORIZATION",
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NULL
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};
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/*
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* Similar to setenv(3) but operates on sudo's private copy of the environment
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* (not environ) and it always overwrites. The dupcheck param determines
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* whether we need to verify that the variable is not already set.
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*/
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static void
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sudo_setenv(var, val, dupcheck)
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const char *var;
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const char *val;
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int dupcheck;
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{
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char *estring;
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size_t esize;
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esize = strlen(var) + 1 + strlen(val) + 1;
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estring = emalloc(esize);
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/* Build environment string and insert it. */
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if (strlcpy(estring, var, esize) >= esize ||
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strlcat(estring, "=", esize) >= esize ||
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strlcat(estring, val, esize) >= esize) {
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errorx(1, "internal error, sudo_setenv() overflow");
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}
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sudo_putenv(estring, dupcheck, TRUE);
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}
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/*
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* Version of setenv(3) that uses our own environ pointer.
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* Will sync with environ as needed.
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*/
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int
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setenv(var, val, overwrite)
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const char *var;
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const char *val;
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int overwrite;
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{
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char *estring, *ep;
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const char *cp;
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size_t esize;
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if (!var || *var == '\0')
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return(EINVAL);
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/*
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* POSIX says a var name with '=' is an error but BSD
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* just ignores the '=' and anything after it.
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*/
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for (cp = var; *cp && *cp != '='; cp++)
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;
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esize = (size_t)(cp - var) + 2;
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if (val) {
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esize += strlen(val); /* glibc treats a NULL val as "" */
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}
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/* Allocate and fill in estring. */
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estring = ep = emalloc(esize);
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for (cp = var; *cp && *cp != '='; cp++)
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*ep++ = *cp;
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*ep++ = '=';
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if (val) {
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for (cp = val; *cp; cp++)
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*ep++ = *cp;
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}
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*ep = '\0';
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/* Sync env.envp with environ as needed. */
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if (env.envp != environ) {
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char **ep;
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size_t len;
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for (ep = environ; *ep != NULL; ep++)
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continue;
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len = ep - environ;
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if (len + 2 > env.env_size) {
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efree(env.envp);
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env.env_size = len + 2 + 128;
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env.envp = emalloc2(env.env_size, sizeof(char *));
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#ifdef ENV_DEBUG
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memset(env.envp, 0, env.env_size * sizeof(char *));
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#endif
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}
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memcpy(env.envp, environ, len * sizeof(char *));
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env.envp[len] = NULL;
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env.env_len = len;
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environ = env.envp;
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#ifdef ENV_DEBUG
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} else {
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if (env.envp[env.env_len] != NULL)
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errorx(1, "setenv: corrupted envp, len mismatch");
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#endif
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}
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sudo_putenv(estring, TRUE, overwrite);
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return(0);
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}
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/*
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* Version of unsetenv(3) that uses our own environ pointer.
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* Will sync with environ as needed.
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*/
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#ifdef UNSETENV_VOID
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void
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#else
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int
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#endif
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unsetenv(var)
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const char *var;
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{
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char **ep;
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size_t len;
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if (strchr(var, '=') != NULL) {
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errno = EINVAL;
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#ifdef UNSETENV_VOID
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return;
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#else
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return(-1);
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#endif
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}
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/* Make sure we are operating on the current environment. */
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/* XXX - this could be optimized to include the search */
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if (env.envp != environ) {
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for (ep = environ; *ep != NULL; ep++)
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continue;
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len = ep - environ;
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if (len + 1 > env.env_size) {
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efree(env.envp);
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env.env_size = len + 1 + 128;
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env.envp = emalloc2(env.env_size, sizeof(char *));
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#ifdef ENV_DEBUG
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memset(env.envp, 0, env.env_size * sizeof(char *));
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#endif
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}
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memcpy(env.envp, environ, len * sizeof(char *));
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env.envp[len] = NULL;
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env.env_len = len;
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environ = env.envp;
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#ifdef ENV_DEBUG
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} else {
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if (env.envp[env.env_len] != NULL)
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errorx(1, "unsetenv: corrupted envp, len mismatch");
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#endif
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}
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len = strlen(var);
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for (ep = env.envp; *ep; ep++) {
|
||||
if (strncmp(var, *ep, len) == 0 && (*ep)[len] == '=') {
|
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/* Found it; shift remainder + NULL over by one and update len. */
|
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memmove(ep, ep + 1,
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(env.env_len - (ep - env.envp)) * sizeof(char *));
|
||||
env.env_len--;
|
||||
break;
|
||||
}
|
||||
}
|
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#ifndef UNSETENV_VOID
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||||
return(0);
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#endif
|
||||
}
|
||||
|
||||
/*
|
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* Version of putenv(3) that uses our own environ pointer.
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* Will sync with environ as needed.
|
||||
*/
|
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int
|
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#ifdef PUTENV_CONST
|
||||
putenv(const char *string)
|
||||
#else
|
||||
putenv(string)
|
||||
char *string;
|
||||
#endif
|
||||
{
|
||||
if (strchr(string, '=') == NULL) {
|
||||
errno = EINVAL;
|
||||
return(-1);
|
||||
}
|
||||
/* Sync env.envp with environ as needed. */
|
||||
if (env.envp != environ) {
|
||||
char **ep;
|
||||
size_t len;
|
||||
|
||||
for (ep = environ; *ep != NULL; ep++)
|
||||
continue;
|
||||
len = ep - environ;
|
||||
if (len + 2 > env.env_size) {
|
||||
efree(env.envp);
|
||||
env.env_size = len + 2 + 128;
|
||||
env.envp = emalloc2(env.env_size, sizeof(char *));
|
||||
#ifdef ENV_DEBUG
|
||||
memset(env.envp, 0, env.env_size * sizeof(char *));
|
||||
#endif
|
||||
}
|
||||
memcpy(env.envp, environ, len * sizeof(char *));
|
||||
env.envp[len] = NULL;
|
||||
env.env_len = len;
|
||||
environ = env.envp;
|
||||
#ifdef ENV_DEBUG
|
||||
} else {
|
||||
if (env.envp[env.env_len] != NULL)
|
||||
errorx(1, "putenv: corrupted envp, len mismatch");
|
||||
#endif
|
||||
}
|
||||
sudo_putenv((char *)string, TRUE, TRUE);
|
||||
return(0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Similar to putenv(3) but operates on sudo's private copy of the
|
||||
* environment (not environ) and it always overwrites. The dupcheck param
|
||||
* determines whether we need to verify that the variable is not already set.
|
||||
* Will only overwrite an existing variable if overwrite is set.
|
||||
*/
|
||||
static void
|
||||
sudo_putenv(str, dupcheck, overwrite)
|
||||
char *str;
|
||||
int dupcheck;
|
||||
int overwrite;
|
||||
{
|
||||
char **ep;
|
||||
size_t len;
|
||||
|
||||
/* Make sure there is room for the new entry plus a NULL. */
|
||||
if (env.env_len + 2 > env.env_size) {
|
||||
env.env_size += 128;
|
||||
env.envp = erealloc3(env.envp, env.env_size, sizeof(char *));
|
||||
#ifdef ENV_DEBUG
|
||||
memset(env.envp + env.env_len, 0,
|
||||
(env.env_size - env.env_len) * sizeof(char *));
|
||||
#endif
|
||||
environ = env.envp;
|
||||
}
|
||||
|
||||
#ifdef ENV_DEBUG
|
||||
if (env.envp[env.env_len] != NULL)
|
||||
errorx(1, "sudo_putenv: corrupted envp, len mismatch");
|
||||
#endif
|
||||
|
||||
if (dupcheck) {
|
||||
len = (strchr(str, '=') - str) + 1;
|
||||
for (ep = env.envp; *ep; ep++) {
|
||||
if (strncmp(str, *ep, len) == 0) {
|
||||
if (overwrite)
|
||||
*ep = str;
|
||||
return;
|
||||
}
|
||||
}
|
||||
} else
|
||||
ep = env.envp + env.env_len;
|
||||
|
||||
env.env_len++;
|
||||
*ep++ = str;
|
||||
*ep = NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the env_delete blacklist.
|
||||
* Returns TRUE if the variable was found, else false.
|
||||
*/
|
||||
static int
|
||||
matches_env_delete(var)
|
||||
const char *var;
|
||||
{
|
||||
struct list_member *cur;
|
||||
size_t len;
|
||||
int iswild, match = FALSE;
|
||||
|
||||
/* Skip anything listed in env_delete. */
|
||||
for (cur = def_env_delete; cur; cur = cur->next) {
|
||||
len = strlen(cur->value);
|
||||
/* Deal with '*' wildcard */
|
||||
if (cur->value[len - 1] == '*') {
|
||||
len--;
|
||||
iswild = TRUE;
|
||||
} else
|
||||
iswild = FALSE;
|
||||
if (strncmp(cur->value, var, len) == 0 &&
|
||||
(iswild || var[len] == '=')) {
|
||||
match = TRUE;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return(match);
|
||||
}
|
||||
|
||||
/*
|
||||
* Apply the env_check list.
|
||||
* Returns TRUE if the variable is allowed, FALSE if denied
|
||||
* or -1 if no match.
|
||||
*/
|
||||
static int
|
||||
matches_env_check(var)
|
||||
const char *var;
|
||||
{
|
||||
struct list_member *cur;
|
||||
size_t len;
|
||||
int iswild, keepit = -1;
|
||||
|
||||
for (cur = def_env_check; cur; cur = cur->next) {
|
||||
len = strlen(cur->value);
|
||||
/* Deal with '*' wildcard */
|
||||
if (cur->value[len - 1] == '*') {
|
||||
len--;
|
||||
iswild = TRUE;
|
||||
} else
|
||||
iswild = FALSE;
|
||||
if (strncmp(cur->value, var, len) == 0 &&
|
||||
(iswild || var[len] == '=')) {
|
||||
keepit = !strpbrk(var, "/%");
|
||||
break;
|
||||
}
|
||||
}
|
||||
return(keepit);
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the env_keep list.
|
||||
* Returns TRUE if the variable is allowed else FALSE.
|
||||
*/
|
||||
static int
|
||||
matches_env_keep(var)
|
||||
const char *var;
|
||||
{
|
||||
struct list_member *cur;
|
||||
size_t len;
|
||||
int iswild, keepit = FALSE;
|
||||
|
||||
for (cur = def_env_keep; cur; cur = cur->next) {
|
||||
len = strlen(cur->value);
|
||||
/* Deal with '*' wildcard */
|
||||
if (cur->value[len - 1] == '*') {
|
||||
len--;
|
||||
iswild = TRUE;
|
||||
} else
|
||||
iswild = FALSE;
|
||||
if (strncmp(cur->value, var, len) == 0 &&
|
||||
(iswild || var[len] == '=')) {
|
||||
keepit = TRUE;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return(keepit);
|
||||
}
|
||||
|
||||
/*
|
||||
* Build a new environment and ether clear potentially dangerous
|
||||
* variables from the old one or start with a clean slate.
|
||||
* Also adds sudo-specific variables (SUDO_*).
|
||||
*/
|
||||
void
|
||||
rebuild_env(sudo_mode, noexec)
|
||||
int sudo_mode;
|
||||
int noexec;
|
||||
{
|
||||
char **old_envp, **ep, *cp, *ps1;
|
||||
char idbuf[MAX_UID_T_LEN];
|
||||
unsigned int didvar;
|
||||
|
||||
/*
|
||||
* Either clean out the environment or reset to a safe default.
|
||||
*/
|
||||
ps1 = NULL;
|
||||
didvar = 0;
|
||||
env.env_len = 0;
|
||||
env.env_size = 128;
|
||||
old_envp = env.envp;
|
||||
env.envp = emalloc2(env.env_size, sizeof(char *));
|
||||
#ifdef ENV_DEBUG
|
||||
memset(env.envp, 0, env.env_size * sizeof(char *));
|
||||
#endif
|
||||
if (def_env_reset || ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
|
||||
/* Pull in vars we want to keep from the old environment. */
|
||||
for (ep = environ; *ep; ep++) {
|
||||
int keepit;
|
||||
|
||||
/* Skip variables with values beginning with () (bash functions) */
|
||||
if ((cp = strchr(*ep, '=')) != NULL) {
|
||||
if (strncmp(cp, "=() ", 3) == 0)
|
||||
continue;
|
||||
}
|
||||
|
||||
/*
|
||||
* First check certain variables for '%' and '/' characters.
|
||||
* If no match there, check the keep list.
|
||||
* If nothing matched, we remove it from the environment.
|
||||
*/
|
||||
keepit = matches_env_check(*ep);
|
||||
if (keepit == -1)
|
||||
keepit = matches_env_keep(*ep);
|
||||
|
||||
/* For SUDO_PS1 -> PS1 conversion. */
|
||||
if (strncmp(*ep, "SUDO_PS1=", 8) == 0)
|
||||
ps1 = *ep + 5;
|
||||
|
||||
if (keepit) {
|
||||
/* Preserve variable. */
|
||||
switch (**ep) {
|
||||
case 'H':
|
||||
if (strncmp(*ep, "HOME=", 5) == 0)
|
||||
SET(didvar, DID_HOME);
|
||||
break;
|
||||
case 'L':
|
||||
if (strncmp(*ep, "LOGNAME=", 8) == 0)
|
||||
SET(didvar, DID_LOGNAME);
|
||||
break;
|
||||
case 'P':
|
||||
if (strncmp(*ep, "PATH=", 5) == 0)
|
||||
SET(didvar, DID_PATH);
|
||||
break;
|
||||
case 'S':
|
||||
if (strncmp(*ep, "SHELL=", 6) == 0)
|
||||
SET(didvar, DID_SHELL);
|
||||
break;
|
||||
case 'T':
|
||||
if (strncmp(*ep, "TERM=", 5) == 0)
|
||||
SET(didvar, DID_TERM);
|
||||
break;
|
||||
case 'U':
|
||||
if (strncmp(*ep, "USER=", 5) == 0)
|
||||
SET(didvar, DID_USER);
|
||||
if (strncmp(*ep, "USERNAME=", 5) == 0)
|
||||
SET(didvar, DID_USERNAME);
|
||||
break;
|
||||
}
|
||||
sudo_putenv(*ep, FALSE, FALSE);
|
||||
}
|
||||
}
|
||||
didvar |= didvar << 8; /* convert DID_* to KEPT_* */
|
||||
|
||||
/*
|
||||
* Add in defaults. In -i mode these come from the runas user,
|
||||
* otherwise they may be from the user's environment (depends
|
||||
* on sudoers options).
|
||||
*/
|
||||
if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
|
||||
sudo_setenv("HOME", runas_pw->pw_dir, ISSET(didvar, DID_HOME));
|
||||
sudo_setenv("SHELL", runas_pw->pw_shell, ISSET(didvar, DID_SHELL));
|
||||
sudo_setenv("LOGNAME", runas_pw->pw_name,
|
||||
ISSET(didvar, DID_LOGNAME));
|
||||
sudo_setenv("USER", runas_pw->pw_name, ISSET(didvar, DID_USER));
|
||||
sudo_setenv("USERNAME", runas_pw->pw_name,
|
||||
ISSET(didvar, DID_USERNAME));
|
||||
} else {
|
||||
if (!ISSET(didvar, DID_HOME))
|
||||
sudo_setenv("HOME", user_dir, FALSE);
|
||||
if (!ISSET(didvar, DID_SHELL))
|
||||
sudo_setenv("SHELL", sudo_user.pw->pw_shell, FALSE);
|
||||
if (!ISSET(didvar, DID_LOGNAME))
|
||||
sudo_setenv("LOGNAME", user_name, FALSE);
|
||||
if (!ISSET(didvar, DID_USER))
|
||||
sudo_setenv("USER", user_name, FALSE);
|
||||
if (!ISSET(didvar, DID_USERNAME))
|
||||
sudo_setenv("USERNAME", user_name, FALSE);
|
||||
}
|
||||
} else {
|
||||
/*
|
||||
* Copy environ entries as long as they don't match env_delete or
|
||||
* env_check.
|
||||
*/
|
||||
for (ep = environ; *ep; ep++) {
|
||||
int okvar;
|
||||
|
||||
/* Skip variables with values beginning with () (bash functions) */
|
||||
if ((cp = strchr(*ep, '=')) != NULL) {
|
||||
if (strncmp(cp, "=() ", 3) == 0)
|
||||
continue;
|
||||
}
|
||||
|
||||
/*
|
||||
* First check variables against the blacklist in env_delete.
|
||||
* If no match there check for '%' and '/' characters.
|
||||
*/
|
||||
okvar = matches_env_delete(*ep) != TRUE;
|
||||
if (okvar)
|
||||
okvar = matches_env_check(*ep) != FALSE;
|
||||
|
||||
if (okvar) {
|
||||
if (strncmp(*ep, "SUDO_PS1=", 9) == 0)
|
||||
ps1 = *ep + 5;
|
||||
else if (strncmp(*ep, "PATH=", 5) == 0)
|
||||
SET(didvar, DID_PATH);
|
||||
else if (strncmp(*ep, "TERM=", 5) == 0)
|
||||
SET(didvar, DID_TERM);
|
||||
sudo_putenv(*ep, FALSE, FALSE);
|
||||
}
|
||||
}
|
||||
}
|
||||
/* Replace the PATH envariable with a secure one? */
|
||||
if (def_secure_path && !user_is_exempt()) {
|
||||
sudo_setenv("PATH", def_secure_path, TRUE);
|
||||
SET(didvar, DID_PATH);
|
||||
}
|
||||
|
||||
/* Set $USER, $LOGNAME and $USERNAME to target if "set_logname" is true. */
|
||||
/* XXX - not needed for MODE_LOGIN_SHELL */
|
||||
if (def_set_logname && runas_pw->pw_name) {
|
||||
if (!ISSET(didvar, KEPT_LOGNAME))
|
||||
sudo_setenv("LOGNAME", runas_pw->pw_name, TRUE);
|
||||
if (!ISSET(didvar, KEPT_USER))
|
||||
sudo_setenv("USER", runas_pw->pw_name, TRUE);
|
||||
if (!ISSET(didvar, KEPT_USERNAME))
|
||||
sudo_setenv("USERNAME", runas_pw->pw_name, TRUE);
|
||||
}
|
||||
|
||||
/* Set $HOME for `sudo -H'. Only valid at PERM_FULL_RUNAS. */
|
||||
/* XXX - not needed for MODE_LOGIN_SHELL */
|
||||
if (runas_pw->pw_dir) {
|
||||
if (ISSET(sudo_mode, MODE_RESET_HOME) ||
|
||||
(ISSET(sudo_mode, MODE_RUN) && (def_always_set_home ||
|
||||
(ISSET(sudo_mode, MODE_SHELL) && def_set_home))))
|
||||
sudo_setenv("HOME", runas_pw->pw_dir, TRUE);
|
||||
}
|
||||
|
||||
/* Provide default values for $TERM and $PATH if they are not set. */
|
||||
if (!ISSET(didvar, DID_TERM))
|
||||
sudo_putenv("TERM=unknown", FALSE, FALSE);
|
||||
if (!ISSET(didvar, DID_PATH))
|
||||
sudo_setenv("PATH", _PATH_DEFPATH, FALSE);
|
||||
|
||||
/*
|
||||
* Preload a noexec file? For a list of LD_PRELOAD-alikes, see
|
||||
* http://www.fortran-2000.com/ArnaudRecipes/sharedlib.html
|
||||
* XXX - should prepend to original value, if any
|
||||
*/
|
||||
if (noexec && def_noexec_file != NULL) {
|
||||
#if defined(__darwin__) || defined(__APPLE__)
|
||||
sudo_setenv("DYLD_INSERT_LIBRARIES", def_noexec_file, TRUE);
|
||||
sudo_setenv("DYLD_FORCE_FLAT_NAMESPACE", "", TRUE);
|
||||
#else
|
||||
# if defined(__osf__) || defined(__sgi)
|
||||
easprintf(&cp, "%s:DEFAULT", def_noexec_file);
|
||||
sudo_setenv("_RLD_LIST", cp, TRUE);
|
||||
efree(cp);
|
||||
# else
|
||||
# ifdef _AIX
|
||||
sudo_setenv("LDR_PRELOAD", def_noexec_file, TRUE);
|
||||
# else
|
||||
sudo_setenv("LD_PRELOAD", def_noexec_file, TRUE);
|
||||
# endif /* _AIX */
|
||||
# endif /* __osf__ || __sgi */
|
||||
#endif /* __darwin__ || __APPLE__ */
|
||||
}
|
||||
|
||||
/* Set PS1 if SUDO_PS1 is set. */
|
||||
if (ps1 != NULL)
|
||||
sudo_putenv(ps1, TRUE, TRUE);
|
||||
|
||||
/* Add the SUDO_COMMAND envariable (cmnd + args). */
|
||||
if (user_args) {
|
||||
easprintf(&cp, "%s %s", user_cmnd, user_args);
|
||||
sudo_setenv("SUDO_COMMAND", cp, TRUE);
|
||||
efree(cp);
|
||||
} else
|
||||
sudo_setenv("SUDO_COMMAND", user_cmnd, TRUE);
|
||||
|
||||
/* Add the SUDO_USER, SUDO_UID, SUDO_GID environment variables. */
|
||||
sudo_setenv("SUDO_USER", user_name, TRUE);
|
||||
snprintf(idbuf, sizeof(idbuf), "%lu", (unsigned long) user_uid);
|
||||
sudo_setenv("SUDO_UID", idbuf, TRUE);
|
||||
snprintf(idbuf, sizeof(idbuf), "%lu", (unsigned long) user_gid);
|
||||
sudo_setenv("SUDO_GID", idbuf, TRUE);
|
||||
|
||||
/* Install new environment. */
|
||||
environ = env.envp;
|
||||
efree(old_envp);
|
||||
}
|
||||
|
||||
void
|
||||
insert_env_vars(env_vars)
|
||||
struct list_member *env_vars;
|
||||
{
|
||||
struct list_member *cur;
|
||||
|
||||
if (env_vars == NULL)
|
||||
return;
|
||||
|
||||
/* Add user-specified environment variables. */
|
||||
for (cur = env_vars; cur != NULL; cur = cur->next)
|
||||
putenv(cur->value);
|
||||
}
|
||||
|
||||
/*
|
||||
* Validate the list of environment variables passed in on the command
|
||||
* line against env_delete, env_check, and env_keep.
|
||||
* Calls log_error() if any specified variables are not allowed.
|
||||
*/
|
||||
void
|
||||
validate_env_vars(env_vars)
|
||||
struct list_member *env_vars;
|
||||
{
|
||||
struct list_member *var;
|
||||
char *eq, *bad = NULL;
|
||||
size_t len, blen = 0, bsize = 0;
|
||||
int okvar;
|
||||
|
||||
for (var = env_vars; var != NULL; var = var->next) {
|
||||
if (def_secure_path && !user_is_exempt() &&
|
||||
strncmp(var->value, "PATH=", 5) == 0) {
|
||||
okvar = FALSE;
|
||||
} else if (def_env_reset) {
|
||||
okvar = matches_env_check(var->value);
|
||||
if (okvar == -1)
|
||||
okvar = matches_env_keep(var->value);
|
||||
} else {
|
||||
okvar = matches_env_delete(var->value) == FALSE;
|
||||
if (okvar == FALSE)
|
||||
okvar = matches_env_check(var->value) != FALSE;
|
||||
}
|
||||
if (okvar == FALSE) {
|
||||
/* Not allowed, add to error string, allocating as needed. */
|
||||
if ((eq = strchr(var->value, '=')) != NULL)
|
||||
*eq = '\0';
|
||||
len = strlen(var->value) + 2;
|
||||
if (blen + len >= bsize) {
|
||||
do {
|
||||
bsize += 1024;
|
||||
} while (blen + len >= bsize);
|
||||
bad = erealloc(bad, bsize);
|
||||
bad[blen] = '\0';
|
||||
}
|
||||
strlcat(bad, var->value, bsize);
|
||||
strlcat(bad, ", ", bsize);
|
||||
blen += len;
|
||||
if (eq != NULL)
|
||||
*eq = '=';
|
||||
}
|
||||
}
|
||||
if (bad != NULL) {
|
||||
bad[blen - 2] = '\0'; /* remove trailing ", " */
|
||||
log_error(NO_MAIL,
|
||||
"sorry, you are not allowed to set the following environment variables: %s", bad);
|
||||
/* NOTREACHED */
|
||||
efree(bad);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Read in /etc/environment ala AIX and Linux.
|
||||
* Lines may be in either of three formats:
|
||||
* NAME=VALUE
|
||||
* NAME="VALUE"
|
||||
* NAME='VALUE'
|
||||
* with an optional "export" prefix so the shell can source the file.
|
||||
* Invalid lines, blank lines, or lines consisting solely of a comment
|
||||
* character are skipped.
|
||||
*/
|
||||
void
|
||||
read_env_file(path, overwrite)
|
||||
const char *path;
|
||||
int overwrite;
|
||||
{
|
||||
FILE *fp;
|
||||
char *cp, *var, *val;
|
||||
size_t var_len, val_len;
|
||||
|
||||
if ((fp = fopen(path, "r")) == NULL)
|
||||
return;
|
||||
|
||||
while ((var = sudo_parseln(fp)) != NULL) {
|
||||
/* Skip blank or comment lines */
|
||||
if (*var == '\0')
|
||||
continue;
|
||||
|
||||
/* Skip optional "export " */
|
||||
if (strncmp(var, "export", 6) == 0 && isspace((unsigned char) var[6])) {
|
||||
var += 7;
|
||||
while (isspace((unsigned char) *var)) {
|
||||
var++;
|
||||
}
|
||||
}
|
||||
|
||||
/* Must be of the form name=["']value['"] */
|
||||
for (val = var; *val != '\0' && *val != '='; val++)
|
||||
;
|
||||
if (var == val || *val != '=')
|
||||
continue;
|
||||
var_len = (size_t)(val - var);
|
||||
val_len = strlen(++val);
|
||||
|
||||
/* Strip leading and trailing single/double quotes */
|
||||
if ((val[0] == '\'' || val[0] == '\"') && val[0] == val[val_len - 1]) {
|
||||
val[val_len - 1] = '\0';
|
||||
val++;
|
||||
val_len -= 2;
|
||||
}
|
||||
|
||||
cp = emalloc(var_len + 1 + val_len + 1);
|
||||
memcpy(cp, var, var_len + 1); /* includes '=' */
|
||||
memcpy(cp + var_len + 1, val, val_len + 1); /* includes NUL */
|
||||
|
||||
sudo_putenv(cp, TRUE, overwrite);
|
||||
}
|
||||
fclose(fp);
|
||||
}
|
||||
|
||||
void
|
||||
init_envtables()
|
||||
{
|
||||
struct list_member *cur;
|
||||
const char **p;
|
||||
|
||||
/* Fill in the "env_delete" list. */
|
||||
for (p = initial_badenv_table; *p; p++) {
|
||||
cur = emalloc(sizeof(struct list_member));
|
||||
cur->value = estrdup(*p);
|
||||
cur->next = def_env_delete;
|
||||
def_env_delete = cur;
|
||||
}
|
||||
|
||||
/* Fill in the "env_check" list. */
|
||||
for (p = initial_checkenv_table; *p; p++) {
|
||||
cur = emalloc(sizeof(struct list_member));
|
||||
cur->value = estrdup(*p);
|
||||
cur->next = def_env_check;
|
||||
def_env_check = cur;
|
||||
}
|
||||
|
||||
/* Fill in the "env_keep" list. */
|
||||
for (p = initial_keepenv_table; *p; p++) {
|
||||
cur = emalloc(sizeof(struct list_member));
|
||||
cur->value = estrdup(*p);
|
||||
cur->next = def_env_keep;
|
||||
def_env_keep = cur;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user