112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/*
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* Copyright (c) 2010-2015 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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#include <config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <unistd.h>
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#include <errno.h>
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#include "sudoers.h"
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/*
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* Search for the specified editor in the user's PATH, checking
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* the result against whitelist if non-NULL. An argument vector
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* suitable for execve() is allocated and stored in argv_out.
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* If nfiles is non-zero, files[] is added to the end of argv_out.
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* Returns the path to be executed on success, else NULL.
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* The caller is responsible for freeing the returned editor path
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* as well as the argument vector.
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*/
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char *
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resolve_editor(const char *ed, size_t edlen, int nfiles, char **files,
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int *argc_out, char ***argv_out, char * const *whitelist)
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{
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char **nargv, *editor, *editor_path = NULL;
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const char *cp, *ep, *tmp;
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const char *edend = ed + edlen;
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struct stat user_editor_sb;
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int nargc;
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debug_decl(resolve_editor, SUDOERS_DEBUG_UTIL)
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/*
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* Split editor into an argument vector, including files to edit.
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* The EDITOR and VISUAL environment variables may contain command
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* line args so look for those and alloc space for them too.
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*/
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cp = sudo_strsplit(ed, edend, " \t", &ep);
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if (cp == NULL)
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debug_return_str(NULL);
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editor = strndup(cp, (size_t)(ep - cp));
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if (editor == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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debug_return_str(NULL);
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}
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/* If we can't find the editor in the user's PATH, give up. */
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if (find_path(editor, &editor_path, &user_editor_sb, getenv("PATH"), 0, whitelist) != FOUND) {
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free(editor);
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errno = ENOENT;
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debug_return_str(NULL);
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}
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/* Count rest of arguments and allocate editor argv. */
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for (nargc = 1, tmp = ep; sudo_strsplit(NULL, edend, " \t", &tmp) != NULL; )
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nargc++;
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if (nfiles != 0)
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nargc += nfiles + 1;
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nargv = reallocarray(NULL, nargc + 1, sizeof(char *));
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if (nargv == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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free(editor);
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free(editor_path);
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debug_return_str(NULL);
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}
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/* Fill in editor argv (assumes files[] is NULL-terminated). */
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nargv[0] = editor;
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for (nargc = 1; (cp = sudo_strsplit(NULL, edend, " \t", &ep)) != NULL; nargc++) {
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nargv[nargc] = strndup(cp, (size_t)(ep - cp));
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if (nargv[nargc] == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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free(editor_path);
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while (nargc--)
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free(nargv[nargc]);
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free(nargv);
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debug_return_str(NULL);
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}
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}
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if (nfiles != 0) {
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nargv[nargc++] = "--";
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while (nfiles--)
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nargv[nargc++] = *files++;
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}
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nargv[nargc] = NULL;
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*argc_out = nargc;
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*argv_out = nargv;
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debug_return_str(editor_path);
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}
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