summaryrefslogtreecommitdiff
path: root/ncurses/tinfo/access.c
diff options
context:
space:
mode:
Diffstat (limited to 'ncurses/tinfo/access.c')
-rw-r--r--ncurses/tinfo/access.c188
1 files changed, 175 insertions, 13 deletions
diff --git a/ncurses/tinfo/access.c b/ncurses/tinfo/access.c
index 50a5769c3d63..17c3d24b9b83 100644
--- a/ncurses/tinfo/access.c
+++ b/ncurses/tinfo/access.c
@@ -1,5 +1,5 @@
/****************************************************************************
- * Copyright 2019-2021,2023 Thomas E. Dickey *
+ * Copyright 2019-2024,2025 Thomas E. Dickey *
* Copyright 1998-2011,2012 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
@@ -34,12 +34,15 @@
#include <curses.priv.h>
#include <ctype.h>
+#include <string.h>
#ifndef USE_ROOT_ACCESS
-#if HAVE_SETFSUID
+#if HAVE_SETFSUID && HAVE_SYS_FSUID_H
#include <sys/fsuid.h>
#else
#include <sys/stat.h>
+#undef HAVE_SETFSUID
+#define HAVE_SETFSUID 0 /* workaround for misconfigured system */
#endif
#endif
@@ -52,7 +55,7 @@
#include <tic.h>
-MODULE_ID("$Id: access.c,v 1.37 2023/06/24 21:55:09 tom Exp $")
+MODULE_ID("$Id: access.c,v 1.50 2025/12/27 16:50:06 tom Exp $")
#define LOWERCASE(c) ((isalpha(UChar(c)) && isupper(UChar(c))) ? tolower(UChar(c)) : (c))
@@ -62,6 +65,108 @@ MODULE_ID("$Id: access.c,v 1.37 2023/06/24 21:55:09 tom Exp $")
# define ACCESS access
#endif
+#if USE_DOS_PATHS
+#define IsPathDelim(pp) (*(pp) == '/' || *(pp) == '\\')
+#define UsesDrive(pp) (isalpha(UChar((pp)[0])) && (pp)[1] == ':')
+#define IsRelative(pp) (*(pp) == '.' && ((*(pp+1) == '.' && IsPathDelim(pp+2)) || IsPathDelim(pp+1)))
+
+static char *
+last_delim(const char *path)
+{
+ char *result = NULL;
+ char *check;
+ if ((check = strrchr(path, '\\')) != NULL)
+ result = check;
+ if ((check = strrchr(path, '/')) != NULL) {
+ if ((check - path) > (result - path))
+ result = check;
+ }
+ return result;
+}
+
+/*
+ * MinGW32 uses an environment variable to point to the directory containing
+ * its executables, without a registry setting to help.
+ */
+static const char *
+msystem_base(void)
+{
+ const char *result = NULL;
+ char *env;
+
+ if ((env = getenv("MSYSTEM")) != NULL
+ && !strcmp(env, "MINGW32")
+ && (env = getenv("WD")) != NULL
+ && UsesDrive(env)) {
+ result = env;
+ }
+ return result;
+}
+
+/*
+ * For MinGW32, convert POSIX pathnames to DOS syntax, allowing use of stat()
+ * and access().
+ */
+NCURSES_EXPORT(const char *)
+_nc_to_dospath(const char *path, char *buffer)
+{
+ if (UsesDrive(path) || IsRelative(path)) {
+ if ((strlen(path) < PATH_MAX) && (strpbrk(path, "/") != NULL)) {
+ char ch;
+ char *ptr = buffer;
+ while ((ch = (*ptr++ = *path++)) != '\0') {
+ if (ch == '/')
+ ptr[-1] = '\\';
+ }
+ path = buffer;
+ }
+ } else if (last_delim(path) != NULL) {
+ const char *env;
+ char *ptr;
+ char *last;
+ size_t needed = PATH_MAX - strlen(path) - 3;
+
+ if ((env = msystem_base()) != NULL
+ && strlen(env) < needed
+ && strcpy(buffer, env) != NULL
+ && (last = last_delim(buffer)) != NULL) {
+ char ch;
+
+ *last = '\0';
+
+ /*
+ * If that was a trailing "\", eat more until we actually
+ * trim the last leaf, which corresponds to the directory
+ * containing MSYS executables.
+ */
+ while (last != NULL && last[1] == '\0') {
+ if ((last = last_delim(buffer)) != NULL) {
+ *last = '\0';
+ }
+ }
+ if (last != NULL) {
+ if (!strncmp(path, "/usr", 4))
+ path += 4;
+ if (IsPathDelim(path)) {
+ while ((last = last_delim(buffer)) != NULL && last[1] == '\0')
+ *last = '\0';
+ ptr = buffer + strlen(buffer);
+ } else {
+ ptr = buffer + strlen(buffer);
+ *ptr++ = '\\';
+ }
+ while ((ch = (*ptr++ = *path++)) != '\0') {
+ if (ch == '/')
+ ptr[-1] = '\\';
+ }
+ path = buffer;
+ }
+ }
+ }
+ return path;
+}
+#endif
+
NCURSES_EXPORT(char *)
_nc_rootname(char *path)
{
@@ -70,7 +175,7 @@ _nc_rootname(char *path)
static char *temp;
char *s;
- if ((temp = strdup(result)) != 0)
+ if ((temp = strdup(result)) != NULL)
result = temp;
#if !MIXEDCASE_FILENAMES
for (s = result; *s != '\0'; ++s) {
@@ -78,7 +183,7 @@ _nc_rootname(char *path)
}
#endif
#if defined(PROG_EXT)
- if ((s = strrchr(result, '.')) != 0) {
+ if ((s = strrchr(result, '.')) != NULL) {
if (!strcmp(s, PROG_EXT))
*s = '\0';
}
@@ -94,10 +199,10 @@ NCURSES_EXPORT(bool)
_nc_is_abs_path(const char *path)
{
#if defined(__EMX__) || defined(__DJGPP__)
-#define is_pathname(s) ((((s) != 0) && ((s)[0] == '/')) \
+#define is_pathname(s) ((((s) != NULL) && ((s)[0] == '/')) \
|| (((s)[0] != 0) && ((s)[1] == ':')))
#else
-#define is_pathname(s) ((s) != 0 && (s)[0] == '/')
+#define is_pathname(s) ((s) != NULL && (s)[0] == '/')
#endif
return is_pathname(path);
}
@@ -110,10 +215,10 @@ _nc_pathlast(const char *path)
{
const char *test = strrchr(path, '/');
#ifdef __EMX__
- if (test == 0)
+ if (test == NULL)
test = strrchr(path, '\\');
#endif
- if (test == 0)
+ if (test == NULL)
test = path;
else
test++;
@@ -131,7 +236,10 @@ _nc_access(const char *path, int mode)
{
int result;
- if (path == 0) {
+ FixupPathname(path);
+
+ if (path == NULL) {
+ errno = ENOENT;
result = -1;
} else if (ACCESS(path, mode) < 0) {
if ((mode & W_OK) != 0
@@ -142,7 +250,7 @@ _nc_access(const char *path, int mode)
_nc_STRCPY(head, path, sizeof(head));
leaf = _nc_basename(head);
- if (leaf == 0)
+ if (leaf == NULL)
leaf = head;
*leaf = '\0';
if (head == leaf)
@@ -150,6 +258,7 @@ _nc_access(const char *path, int mode)
result = ACCESS(head, R_OK | W_OK | X_OK);
} else {
+ errno = EPERM;
result = -1;
}
} else {
@@ -164,7 +273,7 @@ _nc_is_dir_path(const char *path)
bool result = FALSE;
struct stat sb;
- if (stat(path, &sb) == 0
+ if (_nc_is_path_found(path, &sb)
&& S_ISDIR(sb.st_mode)) {
result = TRUE;
}
@@ -177,13 +286,26 @@ _nc_is_file_path(const char *path)
bool result = FALSE;
struct stat sb;
- if (stat(path, &sb) == 0
+ if (_nc_is_path_found(path, &sb)
&& S_ISREG(sb.st_mode)) {
result = TRUE;
}
return result;
}
+NCURSES_EXPORT(bool)
+_nc_is_path_found(const char *path, struct stat * sb)
+{
+ bool result = FALSE;
+
+ FixupPathname(path);
+
+ if (stat(path, sb) == 0) {
+ result = TRUE;
+ }
+ return result;
+}
+
#if HAVE_GETEUID && HAVE_GETEGID
#define is_posix_elevated() \
(getuid() != geteuid() \
@@ -247,6 +369,29 @@ _nc_env_access(void)
}
#ifndef USE_ROOT_ACCESS
+static int
+is_a_file(int fd)
+{
+ int result = FALSE;
+ if (fd >= 0) {
+ struct stat sb;
+ if (fstat(fd, &sb) == 0) {
+ switch (sb.st_mode & S_IFMT) {
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFDIR:
+ /* disallow devices and directories */
+ break;
+ default:
+ /* allow regular files, fifos and sockets */
+ result = TRUE;
+ break;
+ }
+ }
+ }
+ return result;
+}
+
/*
* Limit privileges if possible; otherwise disallow access for updating files.
*/
@@ -254,15 +399,24 @@ NCURSES_EXPORT(FILE *)
_nc_safe_fopen(const char *path, const char *mode)
{
FILE *result = NULL;
+
#if HAVE_SETFSUID
lower_privileges();
+ FixupPathname(path);
result = fopen(path, mode);
resume_elevation();
#else
+ FixupPathname(path);
if (!is_elevated() || *mode == 'r') {
result = fopen(path, mode);
}
#endif
+ if (result != NULL) {
+ if (!is_a_file(fileno(result))) {
+ fclose(result);
+ result = NULL;
+ }
+ }
return result;
}
@@ -272,13 +426,21 @@ _nc_safe_open3(const char *path, int flags, mode_t mode)
int result = -1;
#if HAVE_SETFSUID
lower_privileges();
+ FixupPathname(path);
result = open(path, flags, mode);
resume_elevation();
#else
+ FixupPathname(path);
if (!is_elevated() || (flags & O_RDONLY)) {
result = open(path, flags, mode);
}
#endif
+ if (result >= 0) {
+ if (!is_a_file(result)) {
+ close(result);
+ result = -1;
+ }
+ }
return result;
}
#endif /* USE_ROOT_ACCESS */
generated by cgit v1.2.3 (git 2.25.1) at 2026-01-19 09:33:01 +0000