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elinks/src/formhist/formhist.c
2022-01-16 19:09:27 +01:00

461 lines
9.2 KiB
C

/* Implementation of a login manager for HTML forms */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "elinks.h"
#include "bfu/dialog.h"
#include "config/home.h"
#include "document/forms.h"
#include "formhist/dialogs.h"
#include "formhist/formhist.h"
#include "intl/libintl.h"
#include "main/module.h"
#include "main/object.h"
#include "session/session.h"
#include "terminal/window.h"
#include "util/base64.h"
#include "util/file.h"
#include "util/lists.h"
#include "util/secsave.h"
#include "util/string.h"
#include "viewer/text/form.h"
#define FORMS_HISTORY_FILENAME "formhist"
/* TODO: Remember multiple login for the same form.
* TODO: Password manager GUI (here?) (in dialogs.c, of course --pasky). */
static union option_info forms_history_options[] = {
INIT_OPT_BOOL("document.browse.forms", N_("Show form history dialog"),
"show_formhist", OPT_ZERO, 0,
N_("Ask if a login form should be saved to file or not. "
"This option only disables the dialog, already saved login "
"forms are unaffected.")),
NULL_OPTION_INFO,
};
INIT_LIST_OF(struct formhist_data, saved_forms);
static struct formhist_data *
new_formhist_item(char *url)
{
struct formhist_data *form;
int url_len = strlen(url);
form = mem_calloc(1, sizeof(*form) + url_len);
if (!form) return NULL;
memcpy(form->url, url, url_len);
form->submit = (LIST_OF(struct submitted_value) *)mem_alloc(sizeof(*form->submit));
if (!form->submit) { mem_free(form); return NULL; }
object_nolock(form, "formhist");
init_list(*form->submit);
form->box_item = add_listbox_leaf(&formhist_browser, NULL, form);
if (!form->box_item) {
mem_free(form->submit);
mem_free(form);
return NULL;
}
return form;
}
static void
done_formhist_item(struct formhist_data *form)
{
done_listbox_item(&formhist_browser, form->box_item);
done_submitted_value_list(form->submit);
mem_free(form->submit);
mem_free(form);
}
void
delete_formhist_item(struct formhist_data *form)
{
del_from_list(form);
done_formhist_item(form);
}
static int loaded = 0;
int
load_formhist_from_file(void)
{
struct formhist_data *form;
char tmp[MAX_STR_LEN];
char *file;
FILE *f;
if (loaded) return 1;
if (!elinks_home) return 0;
file = straconcat(elinks_home, FORMS_HISTORY_FILENAME,
(char *) NULL);
if (!file) return 0;
f = fopen(file, "rb");
mem_free(file);
if (!f) return 0;
while (fgets(tmp, MAX_STR_LEN, f)) {
char *p;
int dontsave = 0;
if (tmp[0] == '\n' && !tmp[1]) continue;
p = strchr((const char *)tmp, '\t');
if (p) {
*p = '\0';
++p;
if (!strcmp(tmp, "dontsave"))
dontsave = 1;
} else {
/* Compat. with older file formats. Remove it at some
* time. --Zas */
if (!strncmp(tmp, "dontsave,", 9)) {
dontsave = 1;
p = tmp + 9;
} else {
p = tmp;
}
}
/* URL */
p[strlen(p) - 1] = '\0';
form = new_formhist_item(p);
if (!form) continue;
if (dontsave) form->dontsave = 1;
/* Fields type, name, value */
while (fgets(tmp, MAX_STR_LEN, f)) {
struct submitted_value *sv;
char *type, *name, *value;
char *enc_value;
enum form_type ftype;
int ret;
if (tmp[0] == '\n' && !tmp[1]) break;
/* Type */
type = tmp;
p = strchr((const char *)type, '\t');
if (!p) goto fail;
*p = '\0';
/* Name */
name = ++p;
p = strchr((const char *)name, '\t');
if (!p) {
/* Compatibility with previous file formats.
* REMOVE AT SOME TIME --Zas */
value = name;
name = type;
if (*name == '*') {
name++;
type = "password";
} else {
type = "text";
}
goto cont;
}
*p = '\0';
/* Value */
value = ++p;
cont:
p = strchr((const char *)value, '\n');
if (!p) goto fail;
*p = '\0';
ret = str2form_type(type);
if (ret == -1) goto fail;
ftype = ret;
if (form->dontsave) continue;
enc_value = *value ? base64_decode(value)
: stracpy(value);
if (!enc_value) goto fail;
sv = init_submitted_value(name, enc_value,
ftype, NULL, 0);
mem_free(enc_value);
if (!sv) goto fail;
add_to_list(*form->submit, sv);
}
add_to_list(saved_forms, form);
}
fclose(f);
loaded = 1;
return 1;
fail:
done_formhist_item(form);
return 0;
}
int
save_formhist_to_file(void)
{
struct secure_save_info *ssi;
char *file;
struct formhist_data *form;
int r;
if (!elinks_home || get_cmd_opt_bool("anonymous"))
return 0;
file = straconcat(elinks_home, FORMS_HISTORY_FILENAME,
(char *) NULL);
if (!file) return 0;
ssi = secure_open(file);
mem_free(file);
if (!ssi) return 0;
/* Write the list to password file ($ELINKS_HOME/formhist) */
foreach (form, saved_forms) {
struct submitted_value *sv;
if (form->dontsave) {
secure_fprintf(ssi, "dontsave\t%s\n\n", form->url);
continue;
}
secure_fprintf(ssi, "%s\n", form->url);
foreach (sv, *form->submit) {
char *encvalue;
if (sv->value && *sv->value) {
/* Obfuscate the value. If we do
* $ cat ~/.elinks/formhist
* we don't want someone behind our back to read our
* password (androids don't count). */
encvalue = base64_encode(sv->value);
} else {
encvalue = stracpy("");
}
if (!encvalue) return 0;
/* Format is : type[TAB]name[TAB]value[CR] */
secure_fprintf(ssi, "%s\t%s\t%s\n", form_type2str(sv->type),
sv->name, encvalue);
mem_free(encvalue);
}
secure_fputc(ssi, '\n');
}
r = secure_close(ssi);
if (r == 0) loaded = 1;
return r;
}
/* Check whether the form (chain of @submit submitted_values at @url document)
* is already present in the form history. */
static int
form_exists(struct formhist_data *form1)
{
struct formhist_data *form;
if (!load_formhist_from_file()) return 0;
foreach (form, saved_forms) {
int count = 0;
int exact = 0;
struct submitted_value *sv;
if (strcmp(form->url, form1->url)) continue;
if (form->dontsave) return 1;
/* Iterate through submitted entries. */
foreach (sv, *form1->submit) {
struct submitted_value *sv2;
char *value = NULL;
count++;
foreach (sv2, *form->submit) {
if (sv->type != sv2->type) continue;
if (!strcmp(sv->name, sv2->name)) {
exact++;
value = sv2->value;
break;
}
}
/* If we found a value for that name, check if value
* has changed or not. */
if (value && strcmp(sv->value, value)) return 0;
}
/* Check if submitted values have changed or not. */
if (count && exact && count == exact) return 1;
}
return 0;
}
static int
forget_forms_with_url(char *url)
{
struct formhist_data *form, *next;
int count = 0;
foreachsafe (form, next, saved_forms) {
if (strcmp(form->url, url)) continue;
delete_formhist_item(form);
count++;
}
return count;
}
/* Appends form data @form_ (url and submitted_value(s)) to the password file. */
static void
remember_form(void *form_)
{
struct formhist_data *form = form_;
forget_forms_with_url(form->url);
add_to_list(saved_forms, form);
save_formhist_to_file();
}
static void
dont_remember_form(void *form_)
{
struct formhist_data *form = form_;
done_formhist_item(form);
}
static void
never_for_this_site(void *form_)
{
struct formhist_data *form = form_;
form->dontsave = 1;
remember_form(form);
}
char *
get_form_history_value(char *url, char *name)
{
struct formhist_data *form;
if (!url || !*url || !name || !*name) return NULL;
if (!load_formhist_from_file()) return NULL;
foreach (form, saved_forms) {
if (form->dontsave) continue;
if (!strcmp(form->url, url)) {
struct submitted_value *sv;
foreach (sv, *form->submit)
if (!strcmp(sv->name, name))
return sv->value;
}
}
return NULL;
}
void
memorize_form(struct session *ses, LIST_OF(struct submitted_value) *submit,
struct form *forminfo)
{
/* [gettext_accelerator_context(memorize_form)] */
struct formhist_data *form;
struct submitted_value *sv;
int save = 0;
/* XXX: For now, we only save these types of form fields. */
foreach (sv, *submit) {
if (sv->type == FC_PASSWORD && sv->value && *sv->value) {
save = 1;
break;
}
}
if (!save) return;
/* Create a temporary form. */
form = new_formhist_item(forminfo->action);
if (!form) return;
foreach (sv, *submit) {
if ((sv->type == FC_TEXT) || (sv->type == FC_PASSWORD)) {
struct submitted_value *sv2;
sv2 = init_submitted_value(sv->name, sv->value,
sv->type, NULL, 0);
if (!sv2) goto fail;
add_to_list(*form->submit, sv2);
}
}
if (form_exists(form)) goto fail;
msg_box(ses->tab->term, NULL, 0,
N_("Form history"), ALIGN_CENTER,
N_("Should this login be remembered?\n\n"
"Please note that the password will be stored "
"obscured (but unencrypted) in a file on your disk.\n\n"
"If you are using a valuable password, answer NO."),
form, 3,
MSG_BOX_BUTTON(N_("~Yes"), remember_form, B_ENTER),
MSG_BOX_BUTTON(N_("~No"), dont_remember_form, B_ESC),
MSG_BOX_BUTTON(N_("Ne~ver for this site"), never_for_this_site, 0));
return;
fail:
done_formhist_item(form);
}
static void
done_form_history(struct module *module)
{
struct formhist_data *form, *next;
foreachsafe (form, next, saved_forms) {
delete_formhist_item(form);
}
}
struct module forms_history_module = struct_module(
/* name: */ N_("Form History"),
/* options: */ forms_history_options,
/* events: */ NULL,
/* submodules: */ NULL,
/* data: */ NULL,
/* init: */ NULL,
/* done: */ done_form_history
);