Andrew Boyson / web

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.

base/web-pages-base.h

Committer:
andrewboyson
Date:
2021-05-11
Revision:
160:daa94b75b94c
Parent:
147:ea6f647725a1

File content as of revision 160:daa94b75b94c:

#include <stdint.h>
#include <stdbool.h>

extern void        WebLoginHtml     (void);
extern void        WebLoginQuery    (char* pQuery);
extern bool        WebLoginQueryPasswordOk;
extern int         WebLoginOriginalToDo;
extern bool        WebLoginCookiesContainValidSessionId(char* pCookies);
extern char*       WebLoginSessionNameGet(void);
extern int         WebLoginSessionNameLife(void);
extern char*       WebLoginSessionIdGet(void);
extern void        WebLoginSessionIdNew(void);
extern bool        WebLoginSessionIdIsSet(void);
extern void        WebLoginForceNewPassword (void);
extern void        WebLoginInit(void);

extern void        WebFavicon       (void);
extern const char* WebFaviconDate;
extern const char* WebFaviconTime;
extern const int   WebFaviconSize;

extern void        WebBaseCss       (void);
extern const char* WebBaseCssDate;
extern const char* WebBaseCssTime;
extern void        WebNavCss        (void);
extern const char* WebNavCssDate;
extern const char* WebNavCssTime;

extern void        WebClockHtml     (void);
extern void        WebClockScript   (void);
extern const char* WebClockScriptDate;
extern const char* WebClockScriptTime;
extern void        WebClockAjax     (void);
extern void        WebClockQuery    (char* pQuery);

extern void        WebLogHtml       (void);
extern void        WebLogQuery      (char* pQuery);

extern void        WebTraceHtml     (void);
extern void        WebTraceScript   (void);
extern const char* WebTraceScriptDate;
extern const char* WebTraceScriptTime;
extern void        WebTraceAjax     (void);
extern void        WebTraceQuery    (char* pQuery);

extern void        WebNetHtml       (void);
extern void        WebNetScript     (void);
extern const char* WebNetScriptDate;
extern const char* WebNetScriptTime;
extern void        WebNetAjax       (void);
extern void        WebNetQuery      (char* pQuery);

extern void        WebNet4Html      (void);
extern void        WebNet4Script    (void);
extern const char* WebNet4ScriptDate;
extern const char* WebNet4ScriptTime;
extern void        WebNet4Ajax      (void);

extern void        WebNet6Html      (void);
extern void        WebNet6Script    (void);
extern const char* WebNet6ScriptDate;
extern const char* WebNet6ScriptTime;
extern void        WebNet6Ajax      (void);

extern void        WebResetHtml     (void);
extern void        WebResetQuery    (char* pQuery);

extern void        WebFirmwareHtml  (void);
extern void        WebFirmwareScript(void);
extern const char* WebFirmwareScriptDate;
extern const char* WebFirmwareScriptTime;
extern void        WebFirmwareQuery (char* pQuery);
extern int         WebFirmwareTargetLength;
extern int         WebFirmwareActualLength;
extern char*       WebFirmwareFileName;
extern void        WebFirmwarePost  (int contentLength, int contentStart, int size, char* pRequestStream, uint32_t positionInRequestStream, bool* pComplete);
extern void        WebFirmwareAjax  (void);