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grub/grub-core/gfxmenu/theme_loader.c
Vladimir Serbinenko aebe31c375 verifiers: File type for fine-grained signature-verification controlling 
Let's provide file type info to the I/O layer. This way verifiers
framework and its users will be able to differentiate files and verify
only required ones.

This is preparatory patch.

Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
2020-09-21 13:29:05 -04:00

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/* theme_loader.c - Theme file loader for gfxmenu. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/types.h>
#include <grub/file.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/err.h>
#include <grub/dl.h>
#include <grub/video.h>
#include <grub/gui_string_util.h>
#include <grub/bitmap.h>
#include <grub/bitmap_scale.h>
#include <grub/gfxwidgets.h>
#include <grub/gfxmenu_view.h>
#include <grub/gui.h>
#include <grub/color.h>
static grub_err_t
parse_proportional_spec (const char *value, signed *abs, grub_fixed_signed_t *prop);
/* Construct a new box widget using ABSPATTERN to find the pixmap files for
it, storing the new box instance at *BOXPTR.
PATTERN should be of the form: "(hd0,0)/somewhere/style*.png".
The '*' then gets substituted with the various pixmap names that the
box uses. */
static grub_err_t
recreate_box_absolute (grub_gfxmenu_box_t *boxptr, const char *abspattern)
{
char *prefix;
char *suffix;
char *star;
grub_gfxmenu_box_t box;
star = grub_strchr (abspattern, '*');
if (! star)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"missing `*' in box pixmap pattern `%s'", abspattern);
/* Prefix: Get the part before the '*'. */
prefix = grub_malloc (star - abspattern + 1);
if (! prefix)
return grub_errno;
grub_memcpy (prefix, abspattern, star - abspattern);
prefix[star - abspattern] = '\0';
/* Suffix: Everything after the '*' is the suffix. */
suffix = star + 1;
box = grub_gfxmenu_create_box (prefix, suffix);
grub_free (prefix);
if (! box)
return grub_errno;
if (*boxptr)
(*boxptr)->destroy (*boxptr);
*boxptr = box;
return grub_errno;
}
/* Construct a new box widget using PATTERN to find the pixmap files for it,
storing the new widget at *BOXPTR. PATTERN should be of the form:
"somewhere/style*.png". The '*' then gets substituted with the various
pixmap names that the widget uses.
Important! The value of *BOXPTR must be initialized! It must either
(1) Be 0 (a NULL pointer), or
(2) Be a pointer to a valid 'grub_gfxmenu_box_t' instance.
In this case, the previous instance is destroyed. */
grub_err_t
grub_gui_recreate_box (grub_gfxmenu_box_t *boxptr,
const char *pattern, const char *theme_dir)
{
char *abspattern;
/* Check arguments. */
if (! pattern)
{
/* If no pixmap pattern is given, then just create an empty box. */
if (*boxptr)
(*boxptr)->destroy (*boxptr);
*boxptr = grub_gfxmenu_create_box (0, 0);
return grub_errno;
}
if (! theme_dir)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"styled box missing theme directory");
/* Resolve to an absolute path. */
abspattern = grub_resolve_relative_path (theme_dir, pattern);
if (! abspattern)
return grub_errno;
/* Create the box. */
recreate_box_absolute (boxptr, abspattern);
grub_free (abspattern);
return grub_errno;
}
static grub_err_t
theme_get_unsigned_int_from_proportional (const char *value,
unsigned absolute_value,
unsigned int *parsed_value)
{
grub_err_t err;
grub_fixed_signed_t frac;
signed pixels;
err = parse_proportional_spec (value, &pixels, &frac);
if (err != GRUB_ERR_NONE)
return err;
int result = grub_fixed_sfs_multiply (absolute_value, frac) + pixels;
if (result < 0)
result = 0;
*parsed_value = result;
return GRUB_ERR_NONE;
}
/* Set the specified property NAME on the view to the given string VALUE.
The caller is responsible for the lifetimes of NAME and VALUE. */
static grub_err_t
theme_set_string (grub_gfxmenu_view_t view,
const char *name,
const char *value,
const char *theme_dir,
const char *filename,
int line_num,
int col_num)
{
if (! grub_strcmp ("title-font", name))
view->title_font = grub_font_get (value);
else if (! grub_strcmp ("message-font", name))
view->message_font = grub_font_get (value);
else if (! grub_strcmp ("terminal-font", name))
{
grub_free (view->terminal_font_name);
view->terminal_font_name = grub_strdup (value);
if (! view->terminal_font_name)
return grub_errno;
}
else if (! grub_strcmp ("title-color", name))
grub_video_parse_color (value, &view->title_color);
else if (! grub_strcmp ("message-color", name))
grub_video_parse_color (value, &view->message_color);
else if (! grub_strcmp ("message-bg-color", name))
grub_video_parse_color (value, &view->message_bg_color);
else if (! grub_strcmp ("desktop-image", name))
{
struct grub_video_bitmap *raw_bitmap;
char *path;
path = grub_resolve_relative_path (theme_dir, value);
if (! path)
return grub_errno;
if (grub_video_bitmap_load (&raw_bitmap, path) != GRUB_ERR_NONE)
{
grub_free (path);
return grub_errno;
}
grub_free(path);
grub_video_bitmap_destroy (view->raw_desktop_image);
view->raw_desktop_image = raw_bitmap;
}
else if (! grub_strcmp ("desktop-image-scale-method", name))
{
if (! value || ! grub_strcmp ("stretch", value))
view->desktop_image_scale_method =
GRUB_VIDEO_BITMAP_SELECTION_METHOD_STRETCH;
else if (! grub_strcmp ("crop", value))
view->desktop_image_scale_method =
GRUB_VIDEO_BITMAP_SELECTION_METHOD_CROP;
else if (! grub_strcmp ("padding", value))
view->desktop_image_scale_method =
GRUB_VIDEO_BITMAP_SELECTION_METHOD_PADDING;
else if (! grub_strcmp ("fitwidth", value))
view->desktop_image_scale_method =
GRUB_VIDEO_BITMAP_SELECTION_METHOD_FITWIDTH;
else if (! grub_strcmp ("fitheight", value))
view->desktop_image_scale_method =
GRUB_VIDEO_BITMAP_SELECTION_METHOD_FITHEIGHT;
else
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"Unsupported scale method: %s",
value);
}
else if (! grub_strcmp ("desktop-image-h-align", name))
{
if (! grub_strcmp ("left", value))
view->desktop_image_h_align = GRUB_VIDEO_BITMAP_H_ALIGN_LEFT;
else if (! grub_strcmp ("center", value))
view->desktop_image_h_align = GRUB_VIDEO_BITMAP_H_ALIGN_CENTER;
else if (! grub_strcmp ("right", value))
view->desktop_image_h_align = GRUB_VIDEO_BITMAP_H_ALIGN_RIGHT;
else
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"Unsupported horizontal align method: %s",
value);
}
else if (! grub_strcmp ("desktop-image-v-align", name))
{
if (! grub_strcmp ("top", value))
view->desktop_image_v_align = GRUB_VIDEO_BITMAP_V_ALIGN_TOP;
else if (! grub_strcmp ("center", value))
view->desktop_image_v_align = GRUB_VIDEO_BITMAP_V_ALIGN_CENTER;
else if (! grub_strcmp ("bottom", value))
view->desktop_image_v_align = GRUB_VIDEO_BITMAP_V_ALIGN_BOTTOM;
else
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"Unsupported vertical align method: %s",
value);
}
else if (! grub_strcmp ("desktop-color", name))
grub_video_parse_color (value, &view->desktop_color);
else if (! grub_strcmp ("terminal-box", name))
{
grub_err_t err;
err = grub_gui_recreate_box (&view->terminal_box, value, theme_dir);
if (err != GRUB_ERR_NONE)
return err;
}
else if (! grub_strcmp ("terminal-border", name))
{
view->terminal_border = grub_strtoul (value, 0, 10);
if (grub_errno)
return grub_errno;
}
else if (! grub_strcmp ("terminal-left", name))
{
unsigned int tmp;
int err = theme_get_unsigned_int_from_proportional (value,
view->screen.width,
&tmp);
if (err != GRUB_ERR_NONE)
return err;
view->terminal_rect.x = tmp;
}
else if (! grub_strcmp ("terminal-top", name))
{
unsigned int tmp;
int err = theme_get_unsigned_int_from_proportional (value,
view->screen.height,
&tmp);
if (err != GRUB_ERR_NONE)
return err;
view->terminal_rect.y = tmp;
}
else if (! grub_strcmp ("terminal-width", name))
{
unsigned int tmp;
int err = theme_get_unsigned_int_from_proportional (value,
view->screen.width,
&tmp);
if (err != GRUB_ERR_NONE)
return err;
view->terminal_rect.width = tmp;
}
else if (! grub_strcmp ("terminal-height", name))
{
unsigned int tmp;
int err = theme_get_unsigned_int_from_proportional (value,
view->screen.height,
&tmp);
if (err != GRUB_ERR_NONE)
return err;
view->terminal_rect.height = tmp;
}
else if (! grub_strcmp ("title-text", name))
{
grub_free (view->title_text);
view->title_text = grub_strdup (value);
if (! view->title_text)
return grub_errno;
}
else
{
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"%s:%d:%d unknown property `%s'",
filename, line_num, col_num, name);
}
return grub_errno;
}
struct parsebuf
{
char *buf;
int pos;
int len;
int line_num;
int col_num;
const char *filename;
char *theme_dir;
grub_gfxmenu_view_t view;
};
static int
has_more (struct parsebuf *p)
{
return p->pos < p->len;
}
static int
read_char (struct parsebuf *p)
{
if (has_more (p))
{
char c;
c = p->buf[p->pos++];
if (c == '\n')
{
p->line_num++;
p->col_num = 1;
}
else
{
p->col_num++;
}
return c;
}
else
return -1;
}
static int
peek_char (struct parsebuf *p)
{
if (has_more (p))
return p->buf[p->pos];
else
return -1;
}
static int
is_whitespace (char c)
{
return (c == ' '
|| c == '\t'
|| c == '\r'
|| c == '\n'
|| c == '\f');
}
static void
skip_whitespace (struct parsebuf *p)
{
while (has_more (p) && is_whitespace(peek_char (p)))
read_char (p);
}
static void
advance_to_next_line (struct parsebuf *p)
{
int c;
/* Eat characters up to the newline. */
do
{
c = read_char (p);
}
while (c != -1 && c != '\n');
}
static int
is_identifier_char (int c)
{
return (c != -1
&& (grub_isalpha(c)
|| grub_isdigit(c)
|| c == '_'
|| c == '-'));
}
static char *
read_identifier (struct parsebuf *p)
{
/* Index of the first character of the identifier in p->buf. */
int start;
/* Next index after the last character of the identifer in p->buf. */
int end;
skip_whitespace (p);
/* Capture the start of the identifier. */
start = p->pos;
/* Scan for the end. */
while (is_identifier_char (peek_char (p)))
read_char (p);
end = p->pos;
if (end - start < 1)
return 0;
return grub_new_substring (p->buf, start, end);
}
static char *
read_expression (struct parsebuf *p)
{
int start;
int end;
skip_whitespace (p);
if (peek_char (p) == '"')
{
/* Read as a quoted string.
The quotation marks are not included in the expression value. */
/* Skip opening quotation mark. */
read_char (p);
start = p->pos;
while (has_more (p) && peek_char (p) != '"')
read_char (p);
end = p->pos;
/* Skip the terminating quotation mark. */
read_char (p);
}
else if (peek_char (p) == '(')
{
/* Read as a parenthesized string -- for tuples/coordinates. */
/* The parentheses are included in the expression value. */
int c;
start = p->pos;
do
{
c = read_char (p);
}
while (c != -1 && c != ')');
end = p->pos;
}
else if (has_more (p))
{
/* Read as a single word -- for numeric values or words without
whitespace. */
start = p->pos;
while (has_more (p) && ! is_whitespace (peek_char (p)))
read_char (p);
end = p->pos;
}
else
{
/* The end of the theme file has been reached. */
grub_error (GRUB_ERR_IO, "%s:%d:%d expression expected in theme file",
p->filename, p->line_num, p->col_num);
return 0;
}
return grub_new_substring (p->buf, start, end);
}
static grub_err_t
parse_proportional_spec (const char *value, signed *abs, grub_fixed_signed_t *prop)
{
signed num;
const char *ptr;
int sig = 0;
*abs = 0;
*prop = 0;
ptr = value;
while (*ptr)
{
sig = 0;
while (*ptr == '-' || *ptr == '+')
{
if (*ptr == '-')
sig = !sig;
ptr++;
}
num = grub_strtoul (ptr, (char **) &ptr, 0);
if (grub_errno)
return grub_errno;
if (sig)
num = -num;
if (*ptr == '%')
{
*prop += grub_fixed_fsf_divide (grub_signed_to_fixed (num), 100);
ptr++;
}
else
*abs += num;
}
return GRUB_ERR_NONE;
}
/* Read a GUI object specification from the theme file.
Any components created will be added to the GUI container PARENT. */
static grub_err_t
read_object (struct parsebuf *p, grub_gui_container_t parent)
{
grub_video_rect_t bounds;
char *name;
name = read_identifier (p);
if (! name)
goto cleanup;
grub_gui_component_t component = 0;
if (grub_strcmp (name, "label") == 0)
{
component = grub_gui_label_new ();
}
else if (grub_strcmp (name, "image") == 0)
{
component = grub_gui_image_new ();
}
else if (grub_strcmp (name, "vbox") == 0)
{
component = (grub_gui_component_t) grub_gui_vbox_new ();
}
else if (grub_strcmp (name, "hbox") == 0)
{
component = (grub_gui_component_t) grub_gui_hbox_new ();
}
else if (grub_strcmp (name, "canvas") == 0)
{
component = (grub_gui_component_t) grub_gui_canvas_new ();
}
else if (grub_strcmp (name, "progress_bar") == 0)
{
component = grub_gui_progress_bar_new ();
}
else if (grub_strcmp (name, "circular_progress") == 0)
{
component = grub_gui_circular_progress_new ();
}
else if (grub_strcmp (name, "boot_menu") == 0)
{
component = grub_gui_list_new ();
}
else
{
/* Unknown type. */
grub_error (GRUB_ERR_IO, "%s:%d:%d unknown object type `%s'",
p->filename, p->line_num, p->col_num, name);
goto cleanup;
}
if (! component)
goto cleanup;
/* Inform the component about the theme so it can find its resources. */
component->ops->set_property (component, "theme_dir", p->theme_dir);
component->ops->set_property (component, "theme_path", p->filename);
/* Add the component as a child of PARENT. */
bounds.x = 0;
bounds.y = 0;
bounds.width = -1;
bounds.height = -1;
component->ops->set_bounds (component, &bounds);
parent->ops->add (parent, component);
skip_whitespace (p);
if (read_char (p) != '{')
{
grub_error (GRUB_ERR_IO,
"%s:%d:%d expected `{' after object type name `%s'",
p->filename, p->line_num, p->col_num, name);
goto cleanup;
}
while (has_more (p))
{
skip_whitespace (p);
/* Check whether the end has been encountered. */
if (peek_char (p) == '}')
{
/* Skip the closing brace. */
read_char (p);
break;
}
if (peek_char (p) == '#')
{
/* Skip comments. */
advance_to_next_line (p);
continue;
}
if (peek_char (p) == '+')
{
/* Skip the '+'. */
read_char (p);
/* Check whether this component is a container. */
if (component->ops->is_instance (component, "container"))
{
/* Read the sub-object recursively and add it as a child. */
if (read_object (p, (grub_gui_container_t) component) != 0)
goto cleanup;
/* After reading the sub-object, resume parsing, expecting
another property assignment or sub-object definition. */
continue;
}
else
{
grub_error (GRUB_ERR_IO,
"%s:%d:%d attempted to add object to non-container",
p->filename, p->line_num, p->col_num);
goto cleanup;
}
}
char *property;
property = read_identifier (p);
if (! property)
{
grub_error (GRUB_ERR_IO, "%s:%d:%d identifier expected in theme file",
p->filename, p->line_num, p->col_num);
goto cleanup;
}
skip_whitespace (p);
if (read_char (p) != '=')
{
grub_error (GRUB_ERR_IO,
"%s:%d:%d expected `=' after property name `%s'",
p->filename, p->line_num, p->col_num, property);
grub_free (property);
goto cleanup;
}
skip_whitespace (p);
char *value;
value = read_expression (p);
if (! value)
{
grub_free (property);
goto cleanup;
}
/* Handle the property value. */
if (grub_strcmp (property, "left") == 0)
parse_proportional_spec (value, &component->x, &component->xfrac);
else if (grub_strcmp (property, "top") == 0)
parse_proportional_spec (value, &component->y, &component->yfrac);
else if (grub_strcmp (property, "width") == 0)
parse_proportional_spec (value, &component->w, &component->wfrac);
else if (grub_strcmp (property, "height") == 0)
parse_proportional_spec (value, &component->h, &component->hfrac);
else
/* General property handling. */
component->ops->set_property (component, property, value);
grub_free (value);
grub_free (property);
if (grub_errno != GRUB_ERR_NONE)
goto cleanup;
}
cleanup:
grub_free (name);
return grub_errno;
}
static grub_err_t
read_property (struct parsebuf *p)
{
char *name;
/* Read the property name. */
name = read_identifier (p);
if (! name)
{
advance_to_next_line (p);
return grub_errno;
}
/* Skip whitespace before separator. */
skip_whitespace (p);
/* Read separator. */
if (read_char (p) != ':')
{
grub_error (GRUB_ERR_IO,
"%s:%d:%d missing separator after property name `%s'",
p->filename, p->line_num, p->col_num, name);
goto done;
}
/* Skip whitespace after separator. */
skip_whitespace (p);
/* Get the value based on its type. */
if (peek_char (p) == '"')
{
/* String value (e.g., '"My string"'). */
char *value = read_expression (p);
if (! value)
{
grub_error (GRUB_ERR_IO, "%s:%d:%d missing property value",
p->filename, p->line_num, p->col_num);
goto done;
}
/* If theme_set_string results in an error, grub_errno will be returned
below. */
theme_set_string (p->view, name, value, p->theme_dir,
p->filename, p->line_num, p->col_num);
grub_free (value);
}
else
{
grub_error (GRUB_ERR_IO,
"%s:%d:%d property value invalid; "
"enclose literal values in quotes (\")",
p->filename, p->line_num, p->col_num);
goto done;
}
done:
grub_free (name);
return grub_errno;
}
/* Set properties on the view based on settings from the specified
theme file. */
grub_err_t
grub_gfxmenu_view_load_theme (grub_gfxmenu_view_t view, const char *theme_path)
{
grub_file_t file;
struct parsebuf p;
p.view = view;
p.theme_dir = grub_get_dirname (theme_path);
file = grub_file_open (theme_path, GRUB_FILE_TYPE_THEME);
if (! file)
{
grub_free (p.theme_dir);
return grub_errno;
}
p.len = grub_file_size (file);
p.buf = grub_malloc (p.len);
p.pos = 0;
p.line_num = 1;
p.col_num = 1;
p.filename = theme_path;
if (! p.buf)
{
grub_file_close (file);
grub_free (p.theme_dir);
return grub_errno;
}
if (grub_file_read (file, p.buf, p.len) != p.len)
{
grub_free (p.buf);
grub_file_close (file);
grub_free (p.theme_dir);
return grub_errno;
}
if (view->canvas)
view->canvas->component.ops->destroy (view->canvas);
view->canvas = grub_gui_canvas_new ();
if (!view->canvas)
goto fail;
((grub_gui_component_t) view->canvas)
->ops->set_bounds ((grub_gui_component_t) view->canvas,
&view->screen);
while (has_more (&p))
{
/* Skip comments (lines beginning with #). */
if (peek_char (&p) == '#')
{
advance_to_next_line (&p);
continue;
}
/* Find the first non-whitespace character. */
skip_whitespace (&p);
/* Handle the content. */
if (peek_char (&p) == '+')
{
/* Skip the '+'. */
read_char (&p);
read_object (&p, view->canvas);
}
else
{
read_property (&p);
}
if (grub_errno != GRUB_ERR_NONE)
goto fail;
}
/* Set the new theme path. */
grub_free (view->theme_path);
view->theme_path = grub_strdup (theme_path);
goto cleanup;
fail:
if (view->canvas)
{
view->canvas->component.ops->destroy (view->canvas);
view->canvas = 0;
}
cleanup:
grub_free (p.buf);
grub_file_close (file);
grub_free (p.theme_dir);
return grub_errno;
}
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