Some small changes.

* tik: check for common certificate availability before attempting to convert a personalized ticket to a common one. The raw common certificate chain data for the ticket signature issuer is now returned.

* usb: skip waitMulti call in the USB background thread if an invalid endpoint max packet size was received from the USB host in the previous while loop iteration.

source/tik.c

@@ -121,7 +121,7 @@ bool tikRetrieveTicketByRightsId(Ticket *dst, const FsRightsId *id, bool use_gam
     return true;
 }
 
-void tikConvertPersonalizedTicketToCommonTicket(Ticket *tik)
+bool tikConvertPersonalizedTicketToCommonTicket(Ticket *tik, u8 **out_raw_cert_chain, u64 *out_raw_cert_chain_size)
 {
     TikCommonBlock *tik_common_block = NULL;
     
@@ -130,9 +130,34 @@ void tikConvertPersonalizedTicketToCommonTicket(Ticket *tik)
     u64 signature_size = 0;
     
     bool dev_cert = false;
+    char cert_chain_issuer[0x40] = {0};
+    static const char *common_cert_names[] = { "XS00000020", "XS00000022", NULL };
+    
+    u8 *raw_cert_chain = NULL;
+    u64 raw_cert_chain_size = 0;
     
     if (!tik || tik->type == TikType_None || tik->type > TikType_SigHmac160 || tik->size < SIGNED_TIK_MIN_SIZE || tik->size > SIGNED_TIK_MAX_SIZE || \
-        !(tik_common_block = tikGetCommonBlock(tik->data)) || tik_common_block->titlekey_type != TikTitleKeyType_Personalized) return;
+        !(tik_common_block = tikGetCommonBlock(tik->data)) || tik_common_block->titlekey_type != TikTitleKeyType_Personalized || !out_raw_cert_chain || !out_raw_cert_chain_size)
+    {
+        LOGFILE("Invalid parameters!");
+        return false;
+    }
+    
+    /* Generate raw certificate chain for the new signature issuer (common). */
+    dev_cert = (strstr(tik_common_block->issuer, "CA00000004") != NULL);
+    
+    for(u8 i = 0; common_cert_names[i] != NULL; i++)
+    {
+        sprintf(cert_chain_issuer, "Root-CA%08X-%s", dev_cert ? 4 : 3, common_cert_names[i]);
+        raw_cert_chain = certGenerateRawCertificateChainBySignatureIssuer(cert_chain_issuer, &raw_cert_chain_size);
+        if (raw_cert_chain) break;
+    }
+    
+    if (!raw_cert_chain)
+    {
+        LOGFILE("Failed to generate raw certificate chain for common ticket signature issuer!");
+        return false;
+    }
     
     /* Wipe signature. */
     sig_type = signatureGetSigType(tik->data, false);
@@ -141,9 +166,8 @@ void tikConvertPersonalizedTicketToCommonTicket(Ticket *tik)
     memset(signature, 0xFF, signature_size);
     
     /* Change signature issuer. */
-    dev_cert = (strstr(tik_common_block->issuer, "CA00000004") != NULL);
     memset(tik_common_block->issuer, 0, sizeof(tik_common_block->issuer));
-    sprintf(tik_common_block->issuer, "Root-CA%08X-XS00000020", (dev_cert ? 4 : 3));
+    sprintf(tik_common_block->issuer, "%s", cert_chain_issuer);
     
     /* Wipe the titlekey block and copy the titlekek-encrypted titlekey to it. */
     memset(tik_common_block->titlekey_block, 0, sizeof(tik_common_block->titlekey_block));
@@ -164,6 +188,12 @@ void tikConvertPersonalizedTicketToCommonTicket(Ticket *tik)
     tik_common_block->sect_hdr_entry_size = 0;
     
     memset(tik->data + tik->size, 0, SIGNED_TIK_MAX_SIZE - tik->size);
+    
+    /* Update output pointers. */
+    *out_raw_cert_chain = raw_cert_chain;
+    *out_raw_cert_chain_size = raw_cert_chain_size;
+    
+    return true;
 }
 
 static bool tikRetrieveTicketFromGameCardByRightsId(Ticket *dst, const FsRightsId *id)

source/tik.h

@@ -173,9 +173,10 @@ typedef struct {
 /// Titlekey is also RSA-OAEP unwrapped (if needed) and titlekek decrypted right away.
 bool tikRetrieveTicketByRightsId(Ticket *dst, const FsRightsId *id, bool use_gamecard);
 
-/// This will convert a TikTitleKeyType_Personalized ticket into a TikTitleKeyType_Common ticket.
+/// Converts a TikTitleKeyType_Personalized ticket into a TikTitleKeyType_Common ticket and generates a raw certificate chain for the new signature issuer.
 /// Bear in mind the 'size' member from the Ticket parameter will be updated by this function to remove any possible references to ESV1/ESV2 records.
-void tikConvertPersonalizedTicketToCommonTicket(Ticket *tik);
+/// Raw certificate chain data will be saved to the provided pointers. certGenerateRawCertificateChainBySignatureIssuer() is used internally, so the output buffer must be freed by the user.
+bool tikConvertPersonalizedTicketToCommonTicket(Ticket *tik, u8 **out_raw_cert_chain, u64 *out_raw_cert_chain_size);
 
 /// Helper inline functions.
 

source/usb.c

@@ -431,16 +431,20 @@ static void usbDetectionThreadFunc(void *arg)
     
     Result rc = 0;
     int idx = 0;
+    bool skip_wait = false;
     
     Waiter usb_change_event_waiter = waiterForEvent(g_usbStateChangeEvent);
     Waiter usb_timeout_event_waiter = waiterForUEvent(&g_usbTimeoutEvent);
     Waiter exit_event_waiter = waiterForUEvent(&g_usbDetectionThreadExitEvent);
     
     while(true)
+    {
+        if (!skip_wait)
         {
             /* Wait until an event is triggered. */
             rc = waitMulti(&idx, -1, usb_change_event_waiter, usb_timeout_event_waiter, exit_event_waiter);
             if (R_FAILED(rc)) continue;
+        }
         
         rwlockWriteLock(&g_usbDeviceLock);
         rwlockWriteLock(&(g_usbDeviceInterface.lock));
@@ -451,7 +455,7 @@ static void usbDetectionThreadFunc(void *arg)
         /* Retrieve current USB connection status. */
         /* Only proceed if we're dealing with a status change. */
         g_usbHostAvailable = usbIsHostAvailable();
-        g_usbSessionStarted = false;
+        g_usbSessionStarted = skip_wait = false;
         g_usbTransferRemainingSize = g_usbTransferWrittenSize = 0;
         g_usbEndpointMaxPacketSize = 0;
         
@@ -463,13 +467,18 @@ static void usbDetectionThreadFunc(void *arg)
         if (g_usbHostAvailable)
         {
             /* Wait until a session is established. */
-            /* If the session is successfully established, then we'll get the endpoint max packet size from the data chunk sent by the USB host. */
+            g_usbSessionStarted = usbStartSession();
+            if (g_usbSessionStarted)
+            {
+                /* Get the endpoint max packet size from the response sent by the USB host. */
                 /* This is done to accurately know when and where to enable Zero Length Termination (ZLT) packets during bulk transfers. */
                 /* As much as I'd like to avoid this, usb:ds doesn't disclose information such as the exact device descriptor and/or speed used by the USB host. */
-            g_usbSessionStarted = (usbStartSession() && usbGetMaxPacketSizeFromHost());
-            
+                /* If this step fails (e.g. unexpected max packet size), the write endpoint will be stalled and we'll wait until a new USB session is established. */
+                if (!(skip_wait = !usbGetMaxPacketSizeFromHost())) LOGFILE("USB session successfully established. Endpoint max packet size: 0x%04X.", g_usbEndpointMaxPacketSize);
+            } else {
                 /* Check if the exit event was triggered while waiting for a session to be established. */
-            if (!g_usbSessionStarted && g_usbDetectionThreadExitFlag) break;
+                if (g_usbDetectionThreadExitFlag) break;
+            }
         }
         
         rwlockWriteUnlock(&(g_usbDeviceInterface.lock));
@@ -545,14 +554,13 @@ static bool usbGetMaxPacketSizeFromHost(void)
         usbDsEndpoint_Stall(g_usbDeviceInterface.endpoint_in);
         rwlockWriteUnlock(&(g_usbDeviceInterface.lock_in));
         
-        /* Reset endpoint max packet size. */
+        /* Reset flags. */
+        g_usbSessionStarted = false;
         g_usbEndpointMaxPacketSize = 0;
         
         return false;
     }
     
-    LOGFILE("USB session successfully established. Endpoint max packet size: 0x%04X.", g_usbEndpointMaxPacketSize);
-    
     return true;
 }
 

todo.txt

@@ -4,7 +4,7 @@ todo:
     nca: function to write re-encrypted nca headers / nca fs headers (don't forget nca0 please)
     nca: function to patch the private npdm acid signature from a program nca + patch the acid signature from the nca header
     
-    tik: make sure the common crypto cert (XS20, XS22) is available when fakesigning a ticket
+    tik: option to wipe elicense property mask
     tik: automatically dump tickets to the SD card?
     tik: use dumped tickets when the original ones can't be found in the ES savefile?