Andrew Boyson
Common stuff for all my devices' web server pages: css, login, log, ipv4, ipv6, firmware update, clock, reset info etc.
Dependents: oldheating gps motorhome heating
Security
A password has to be set whenever there has been a software reset. Resets following faults or power on do not require a new password as the hash is restored from the RTC GPREG register.
The password is not saved on the device; instead a 32 bit hash of the password is saved. It would take 2^31 attempts to brute force the password: this could be done in under a month if an attempt were possible every millisecond. To prevent this a 200 ms delay is introduced in the reply to the login form, that gives a more reasonable 13 years to brute force the password.
Once the password is accepted a random session id is created. This is 36 bit to give six base 64 characters but without an extra delay. If an attempt could be made every ms then this would still take over a year to brute force.
The most likely attack would to use a dictionary with, say, 10 million entries against the password which would still take 20 days to do.
Diff: web-add.c
- Revision:
- 109:3e82f62c7e1f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/web-add.c Mon Apr 29 14:45:30 2019 +0000
@@ -0,0 +1,215 @@
+#include <stdio.h>
+
+#include "http.h"
+#include "web-nav-base.h"
+#include "web-nav-derived.h"
+#include "web-site-name.h"
+#include "mac.h"
+#include "ip4addr.h"
+#include "ip6addr.h"
+
+void WebAddNavItem(int highlight, char* href, char* title)
+{
+ char *p;
+ HttpAddText("<li ");
+ if (highlight) p = "class='this'";
+ else p = " ";
+ HttpAddText(p);
+ HttpAddText("><a href='");
+ HttpAddText(href);
+ HttpAddText("'>");
+ HttpAddText(title);
+ HttpAddText("</a></li>\r\n");
+}
+void WebAddNav(int page)
+{
+ HttpAddText("<a class='tab-shortcut' href='#main-content'>Skip to content</a>\r\n");
+
+ HttpAddText("<nav><ul>\r\n");
+ WebNavDerived(page);
+ WebNavBase(page);
+ HttpAddText("</ul></nav>\r\n");
+}
+
+void WebAddHeader(const char* title, const char* style, const char* script)
+{
+ HttpAddText("<!DOCTYPE html>\r\n"
+ "<html>\r\n"
+ "<head>\r\n");
+ HttpAddText(" <title>");
+ HttpAddText(WEB_SITE_NAME);
+ if (title)
+ {
+ HttpAddText(" - ");
+ HttpAddText(title);
+ }
+ HttpAddText("</title>\r\n");
+
+ HttpAddText(" <link rel='stylesheet' href='/base.css' type='text/css'/>\r\n");
+ if (style)
+ {
+ HttpAddText(" <link rel='stylesheet' href='/");
+ HttpAddText(style);
+ HttpAddText("' type='text/css'/>\r\n");
+ }
+ if (script)
+ {
+ HttpAddText(" <script src='/");
+ HttpAddText(script);
+ HttpAddText("' type='text/javascript'></script>\r\n");
+ }
+ HttpAddText(" <meta name='viewport' content='width=device-width, initial-scale=1'>\r\n"
+ " <link rel='icon' href='/favicon.ico' type='image/x-icon'/>\r\n"
+ "</head>\r\n"
+ "<body>\r\n");
+
+}
+void WebAddH1(const char* pageName)
+{
+ HttpAddText("<h1 id='main-content'>");
+ HttpAddText(WEB_SITE_NAME);
+ HttpAddText(" - ");
+ HttpAddText(pageName);
+ HttpAddText("</h1>\r\n");
+}
+void WebAddH2(const char* text)
+{
+ HttpAddText("<h2>");
+ HttpAddText(text);
+ HttpAddText("</h2>\r\n");
+}
+void WebAddEnd()
+{
+ HttpAddText("</body>\r\n"
+ "</html>\r\n");
+}
+
+void WebAddLabelledPrefixSuffix(char* label, char* prefix, char* text, char* suffix)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <div>%s%s%s</div>\r\n", prefix, text, suffix);
+ HttpAddText("</div>\r\n");
+}
+void WebAddLabelledText(char* label, char* text)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <div>%s</div>\r\n", text);
+ HttpAddText("</div>\r\n");
+}
+
+void WebAddLabelledMac(char* label, char* mac)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddText(" <div>"); MacHttp(mac); HttpAddText("</div>\r\n");
+ HttpAddText("</div>\r\n");
+}
+
+void WebAddLabelledIp4(char* label, uint32_t ip)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddText(" <div>"); Ip4AddressHttp(ip); HttpAddText("</div>\r\n");
+ HttpAddText("</div>\r\n");
+}
+
+void WebAddLabelledIp6(char* label, char* ip)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddText(" <div>"); Ip6AddressHttp(ip); HttpAddText("</div>\r\n");
+ HttpAddText("</div>\r\n");
+}
+void WebAddLabelledOnOff(char* label, bool value)
+{
+ if (value) WebAddLabelledText(label, "On");
+ else WebAddLabelledText(label, "Off");
+}
+void WebAddLabelledInt(char* label, int value)
+{
+ char text[30];
+ snprintf(text, sizeof(text), "%8d", value); //Right align with enough spaces so that the length is always constant.
+ WebAddLabelledText(label, text);
+}
+void WebAddInputText(char* label, float inputwidth, char* value, char* action, char* name)
+{
+ HttpAddF ("<form action='%s' method='get'>\r\n", action);
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <input type='text' name='%s' style='width:%.1fem;' value='%s'>\r\n", name, inputwidth, value);
+ HttpAddText("</div>\r\n");
+ HttpAddText("<input type='submit' value='Set' style='display:none;'>\r\n");
+ HttpAddF ("</form>\r\n");
+
+}
+void WebAddInputInt(char* label, float inputwidth, int value, char* action, char* name)
+{
+ char text[30];
+ snprintf(text, sizeof(text), "%d", value);
+ WebAddInputText(label, inputwidth, text, action, name);
+}
+void WebAddInputButton(char* label, char* value, char* action, char* name)
+{
+ HttpAddF ("<form action='%s' method='get'>\r\n", action);
+ HttpAddF ("<input type='hidden' name='%s'>\r\n", name);
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <input type='submit' value='%s'>\r\n", value);
+ HttpAddText("</div>\r\n");
+ HttpAddText("</form>\r\n");
+}
+void WebAddAjaxInputToggle(char* label, char* id, char* name)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <div class='toggle' id='%s' tabindex='0' dir='ltr' onclick='AjaxRequest(\"%s=1\")' onkeydown='return event.keyCode != 13 || AjaxRequest(\"%s=1\")'>\r\n", id, name, name);
+ HttpAddText(" <div class='slot'></div><div class='knob'></div>\r\n");
+ HttpAddText(" </div>\r\n");
+ HttpAddText("</div>\r\n");
+}
+void WebAddAjaxLed(char* label, char* id)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <div class='led' id='%s' dir='ltr'></div>\r\n", id);
+ HttpAddText("</div>\r\n");
+}
+void WebAddAjaxInput(char* label, float inputwidth, char* id, char* name)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <input type='text' style='width:%.1fem;' id='%s' onchange='AjaxRequest(\"%s=\" + this.value)'>\r\n", inputwidth, id, name);
+ HttpAddText("</div>\r\n");
+}
+void WebAddAjaxInputSuffix(char* label, float inputwidth, char* id, char* name, char* suffix)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <input type='text' style='width:%.1fem;' id='%s' onchange='AjaxRequest(\"%s=\" + this.value)'>%s\r\n", inputwidth, id, name, suffix);
+ HttpAddText("</div>\r\n");
+}
+void WebAddAjaxLabelled(char* label, char* id)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <div id='%s'></div>\r\n", id);
+ HttpAddText("</div>\r\n");
+}
+void WebAddAjaxLabelledSuffix(char* label, char* id, char* suffix)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div>%s</div>\r\n", label);
+ HttpAddF (" <div><span id='%s'></span>%s</div>\r\n", id, suffix);
+ HttpAddText("</div>\r\n");
+}
+void WebAddAjaxInputLabelId(char* labelId, float inputwidth, char* id, char* name)
+{
+ HttpAddText("<div class='line'>\r\n");
+ HttpAddF (" <div id='%s'></div>\r\n", labelId);
+ HttpAddF (" <input type='text' style='width:%.1fem;' id='%s' onchange='AjaxRequest(\"%s=\" + this.value)'>\r\n", inputwidth, id, name);
+ HttpAddText("</div>\r\n");
+}
+
+