Andrew Boyson / crypto

A simple library to support serving https.

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tls/tls-session.c@13:0a80b49a5e78, 2019-09-27 (annotated)

Committer:
andrewboyson
Date:
Fri Sep 27 11:31:18 2019 +0000
Revision:
13:0a80b49a5e78
Parent:
10:e269fd7b9500
Child:
14:03a0b8fd6ddc
Removed bug with TLS session. Unable to test as compiler has moved to v6 again (I think)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 5:ee5489ee1117 1 #include <stdlib.h>
andrewboyson 2:82268409e83f 2 #include <stdint.h>
andrewboyson 2:82268409e83f 3 #include <stdbool.h>
andrewboyson 2:82268409e83f 4
andrewboyson 2:82268409e83f 5 #include "tls-session.h"
andrewboyson 2:82268409e83f 6 #include "mstimer.h"
andrewboyson 10:e269fd7b9500 7 #include "hrtimer.h"
andrewboyson 13:0a80b49a5e78 8 #include "log.h"
andrewboyson 2:82268409e83f 9
andrewboyson 2:82268409e83f 10 #define TLS_MAX_SESSIONS 4
andrewboyson 2:82268409e83f 11
andrewboyson 2:82268409e83f 12 static struct TlsSession sessions[TLS_MAX_SESSIONS];
andrewboyson 2:82268409e83f 13
andrewboyson 10:e269fd7b9500 14 static void zeroSession(struct TlsSession* p)
andrewboyson 2:82268409e83f 15 {
andrewboyson 10:e269fd7b9500 16 p->id = 0;
andrewboyson 10:e269fd7b9500 17 p->lastUsed = 0;
andrewboyson 10:e269fd7b9500 18 p->valid = false;
andrewboyson 10:e269fd7b9500 19 p->slotPriKeyDecryption = 0;
andrewboyson 10:e269fd7b9500 20 for (int i = 0; i < TLS_KEY_SIZE_MASTER; i++) p->masterSecret[i] = 0;
andrewboyson 10:e269fd7b9500 21 }
andrewboyson 10:e269fd7b9500 22
andrewboyson 10:e269fd7b9500 23 struct TlsSession* TlsSessionNew() //Never fails so never returns NULL
andrewboyson 10:e269fd7b9500 24 {
andrewboyson 10:e269fd7b9500 25 struct TlsSession* p;
andrewboyson 10:e269fd7b9500 26
andrewboyson 10:e269fd7b9500 27 //look for an empty connection
andrewboyson 2:82268409e83f 28 struct TlsSession* pOldest = 0;
andrewboyson 2:82268409e83f 29 uint32_t ageOldest = 0;
andrewboyson 10:e269fd7b9500 30 for (p = sessions; p < sessions + TLS_MAX_SESSIONS; p++)
andrewboyson 2:82268409e83f 31 {
andrewboyson 10:e269fd7b9500 32 if (!p->id) goto end; //Found an empty slot so just return it
andrewboyson 5:ee5489ee1117 33 uint32_t age = MsTimerCount - p->lastUsed;
andrewboyson 2:82268409e83f 34 if (age >= ageOldest)
andrewboyson 2:82268409e83f 35 {
andrewboyson 2:82268409e83f 36 ageOldest = age;
andrewboyson 5:ee5489ee1117 37 pOldest = p;
andrewboyson 2:82268409e83f 38 }
andrewboyson 2:82268409e83f 39 }
andrewboyson 10:e269fd7b9500 40
andrewboyson 10:e269fd7b9500 41 //No empty ones found so use the oldest
andrewboyson 10:e269fd7b9500 42 p = pOldest;
andrewboyson 10:e269fd7b9500 43
andrewboyson 10:e269fd7b9500 44 end:
andrewboyson 10:e269fd7b9500 45 zeroSession(p);
andrewboyson 10:e269fd7b9500 46 uint32_t id = 0;
andrewboyson 10:e269fd7b9500 47 while (!id) id = HrTimerCount(); //This is used as a convenient unique identifier which is never zero;
andrewboyson 10:e269fd7b9500 48 p->id = id;
andrewboyson 10:e269fd7b9500 49 p->lastUsed = MsTimerCount;
andrewboyson 10:e269fd7b9500 50 return p;
andrewboyson 2:82268409e83f 51 }
andrewboyson 2:82268409e83f 52
andrewboyson 10:e269fd7b9500 53 struct TlsSession* TlsSessionOrNull(uint32_t id)
andrewboyson 2:82268409e83f 54 {
andrewboyson 13:0a80b49a5e78 55 if (!id)
andrewboyson 13:0a80b49a5e78 56 {
andrewboyson 13:0a80b49a5e78 57 Log("TlsSessionOrNull - session id cannot be 0\r\n");
andrewboyson 13:0a80b49a5e78 58 return 0;
andrewboyson 13:0a80b49a5e78 59 }
andrewboyson 10:e269fd7b9500 60 for (struct TlsSession* p = sessions; p < sessions + TLS_MAX_SESSIONS; p++)
andrewboyson 10:e269fd7b9500 61 {
andrewboyson 10:e269fd7b9500 62 if (p->id == id) return p;
andrewboyson 10:e269fd7b9500 63 }
andrewboyson 10:e269fd7b9500 64 return 0;
andrewboyson 2:82268409e83f 65 }
andrewboyson 10:e269fd7b9500 66 void TlsSessionReset(uint32_t id)
andrewboyson 2:82268409e83f 67 {
andrewboyson 13:0a80b49a5e78 68 if (!id)
andrewboyson 13:0a80b49a5e78 69 {
andrewboyson 13:0a80b49a5e78 70 Log("TlsSessionReset - session id cannot be 0\r\n");
andrewboyson 13:0a80b49a5e78 71 return;
andrewboyson 13:0a80b49a5e78 72 }
andrewboyson 10:e269fd7b9500 73 for (struct TlsSession* p = sessions; p < sessions + TLS_MAX_SESSIONS; p++)
andrewboyson 10:e269fd7b9500 74 {
andrewboyson 10:e269fd7b9500 75 if (p->id == id) zeroSession(p);
andrewboyson 10:e269fd7b9500 76 }
andrewboyson 2:82268409e83f 77 }