The Tor Browser: security/nss/lib/dev/devslot.c@b8a032363ba2 (annotated)

security/nss/lib/dev/devslot.c@b8a032363ba2 (annotated)

security/nss/lib/dev/devslot.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "pkcs11.h"
 #ifndef DEVM_H
 #include "devm.h"
 #endif /* DEVM_H */
 #ifndef CKHELPER_H
 #include "ckhelper.h"
 #endif /* CKHELPER_H */
 #include "pk11pub.h"
 /* measured in seconds */
 #define NSSSLOT_TOKEN_DELAY_TIME 1
 /* this should track global and per-transaction login information */
 #define NSSSLOT_IS_FRIENDLY(slot) \
   (slot->base.flags & NSSSLOT_FLAGS_FRIENDLY)
 /* measured as interval */
 static PRIntervalTime s_token_delay_time = 0;
 /* The flags needed to open a read-only session. */
 static const CK_FLAGS s_ck_readonly_flags = CKF_SERIAL_SESSION;
 NSS_IMPLEMENT PRStatus
 nssSlot_Destroy (
   NSSSlot *slot
 )
 {
     if (slot) {
 	if (PR_ATOMIC_DECREMENT(&slot->base.refCount) == 0) {
 	    PZ_DestroyLock(slot->base.lock);
 	    return nssArena_Destroy(slot->base.arena);
 	}
     }
     return PR_SUCCESS;
 }
 void
 nssSlot_EnterMonitor(NSSSlot *slot)
 {
     if (slot->lock) {
 	PZ_Lock(slot->lock);
     }
 }
 void
 nssSlot_ExitMonitor(NSSSlot *slot)
 {
     if (slot->lock) {
 	PZ_Unlock(slot->lock);
     }
 }
 NSS_IMPLEMENT void
 NSSSlot_Destroy (
   NSSSlot *slot
 )
 {
     (void)nssSlot_Destroy(slot);
 }
 NSS_IMPLEMENT NSSSlot *
 nssSlot_AddRef (
   NSSSlot *slot
 )
 {
     PR_ATOMIC_INCREMENT(&slot->base.refCount);
     return slot;
 }
 NSS_IMPLEMENT NSSUTF8 *
 nssSlot_GetName (
   NSSSlot *slot
 )
 {
     return slot->base.name;
 }
 NSS_IMPLEMENT NSSUTF8 *
 nssSlot_GetTokenName (
   NSSSlot *slot
 )
 {
     return nssToken_GetName(slot->token);
 }
 NSS_IMPLEMENT void
 nssSlot_ResetDelay (
   NSSSlot *slot
 )
 {
     slot->lastTokenPing = 0;
 }
 static PRBool
 within_token_delay_period(NSSSlot *slot)
 {
     PRIntervalTime time, lastTime;
     /* Set the delay time for checking the token presence */
     if (s_token_delay_time == 0) {
 	s_token_delay_time = PR_SecondsToInterval(NSSSLOT_TOKEN_DELAY_TIME);
     }
     time = PR_IntervalNow();
     lastTime = slot->lastTokenPing;
     if ((lastTime) && ((time - lastTime) < s_token_delay_time)) {
 	return PR_TRUE;
     }
     slot->lastTokenPing = time;
     return PR_FALSE;
 }
 NSS_IMPLEMENT PRBool
 nssSlot_IsTokenPresent (
   NSSSlot *slot
 )
 {
     CK_RV ckrv;
     PRStatus nssrv;
     /* XXX */
     nssSession *session;
     CK_SLOT_INFO slotInfo;
     void *epv;
     /* permanent slots are always present unless they're disabled */
     if (nssSlot_IsPermanent(slot)) {
 	return !PK11_IsDisabled(slot->pk11slot);
     }
     /* avoid repeated calls to check token status within set interval */
     if (within_token_delay_period(slot)) {
 	return ((slot->ckFlags & CKF_TOKEN_PRESENT) != 0);
     }
     /* First obtain the slot info */
     epv = slot->epv;
     if (!epv) {
 	return PR_FALSE;
     }
     nssSlot_EnterMonitor(slot);
     ckrv = CKAPI(epv)->C_GetSlotInfo(slot->slotID, &slotInfo);
     nssSlot_ExitMonitor(slot);
     if (ckrv != CKR_OK) {
 	slot->token->base.name[0] = 0; /* XXX */
 	return PR_FALSE;
     }
     slot->ckFlags = slotInfo.flags;
     /* check for the presence of the token */
     if ((slot->ckFlags & CKF_TOKEN_PRESENT) == 0) {
 	if (!slot->token) {
 	    /* token was never present */
 	    return PR_FALSE;
 	}
 	session = nssToken_GetDefaultSession(slot->token);
 	if (session) {
 	    nssSession_EnterMonitor(session);
 	    /* token is not present */
 	    if (session->handle != CK_INVALID_SESSION) {
 		/* session is valid, close and invalidate it */
 		CKAPI(epv)->C_CloseSession(session->handle);
 		session->handle = CK_INVALID_SESSION;
 	    }
 	    nssSession_ExitMonitor(session);
 	}
 	if (slot->token->base.name[0] != 0) {
 	    /* notify the high-level cache that the token is removed */
 	    slot->token->base.name[0] = 0; /* XXX */
 	    nssToken_NotifyCertsNotVisible(slot->token);
 	}
 	slot->token->base.name[0] = 0; /* XXX */
 	/* clear the token cache */
 	nssToken_Remove(slot->token);
 	return PR_FALSE;
     }
     /* token is present, use the session info to determine if the card
      * has been removed and reinserted.
      */
     session = nssToken_GetDefaultSession(slot->token);
     if (session) {
 	PRBool isPresent = PR_FALSE;
 	nssSession_EnterMonitor(session);
 	if (session->handle != CK_INVALID_SESSION) {
 	    CK_SESSION_INFO sessionInfo;
 	    ckrv = CKAPI(epv)->C_GetSessionInfo(session->handle, &sessionInfo);
 	    if (ckrv != CKR_OK) {
 		/* session is screwy, close and invalidate it */
 		CKAPI(epv)->C_CloseSession(session->handle);
 		session->handle = CK_INVALID_SESSION;
 	    }
 	}
 	isPresent = session->handle != CK_INVALID_SESSION;
 	nssSession_ExitMonitor(session);
 	/* token not removed, finished */
 	if (isPresent)
 	    return PR_TRUE;
     }
     /* the token has been removed, and reinserted, or the slot contains
      * a token it doesn't recognize. invalidate all the old
      * information we had on this token, if we can't refresh, clear
      * the present flag */
     nssToken_NotifyCertsNotVisible(slot->token);
     nssToken_Remove(slot->token);
     /* token has been removed, need to refresh with new session */
     nssrv = nssSlot_Refresh(slot);
     if (nssrv != PR_SUCCESS) {
         slot->token->base.name[0] = 0; /* XXX */
         slot->ckFlags &= ~CKF_TOKEN_PRESENT;
         return PR_FALSE;
     }
     return PR_TRUE;
 }
 NSS_IMPLEMENT void *
 nssSlot_GetCryptokiEPV (
   NSSSlot *slot
 )
 {
     return slot->epv;
 }
 NSS_IMPLEMENT NSSToken *
 nssSlot_GetToken (
   NSSSlot *slot
 )
 {
     if (nssSlot_IsTokenPresent(slot)) {
 	return nssToken_AddRef(slot->token);
     }
     return (NSSToken *)NULL;
 }
 NSS_IMPLEMENT PRStatus
 nssSession_EnterMonitor (
   nssSession *s
 )
 {
     if (s->lock) PZ_Lock(s->lock);
     return PR_SUCCESS;
 }
 NSS_IMPLEMENT PRStatus
 nssSession_ExitMonitor (
   nssSession *s
 )
 {
     return (s->lock) ? PZ_Unlock(s->lock) : PR_SUCCESS;
 }
 NSS_EXTERN PRBool
 nssSession_IsReadWrite (
   nssSession *s
 )
 {
     return s->isRW;
 }

The Tor Browser / annotate

security/nss/lib/dev/devslot.c@b8a032363ba2 (annotated)

security/nss/lib/dev/devslot.c