[nss] - Fix crmf hard-coded maximum size for wrapped private keys (#703658)

[Elio Maldonado]

commit c409805d4536aa2be445d7c60121ee21203d14ca
Author: Elio Maldonado <emaldona at ruminate4fedora.localdomain>
Date:   Tue May 17 09:07:55 2011 -0700

    - Fix crmf hard-coded maximum size for wrapped private keys (#703658)
    
    - Use the safer bound off
    - ( ( RSA_MAX_MODULUS_BITS / 8 ) *8 ) = RSA_MAX_MODULUS_BITS
    - which will accomodate other algorithms

 nss-703658.patch |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 nss.spec         |    7 ++++++-
 2 files changed, 53 insertions(+), 1 deletions(-)
---
diff --git a/nss-703658.patch b/nss-703658.patch
new file mode 100644
index 0000000..182a593
--- /dev/null
+++ b/nss-703658.patch
@@ -0,0 +1,47 @@
+Index: mozilla/security/nss/lib/crmf/crmfi.h
+===================================================================
+RCS file: /cvsroot/mozilla/security/nss/lib/crmf/crmfi.h,v
+retrieving revision 1.4
+diff -u -u -r1.4 crmfi.h
+--- mozilla/security/nss/lib/crmf/crmfi.h	15 Jan 2011 19:47:11 -0000	1.4
++++ mozilla/security/nss/lib/crmf/crmfi.h	11 May 2011 20:06:26 -0000
+@@ -46,10 +46,38 @@
+ #include "secasn1.h"
+ #include "crmfit.h"
+ #include "secerr.h"
++#include "blapit.h"
+ 
+ #define CRMF_DEFAULT_ARENA_SIZE   1024
+-#define MAX_WRAPPED_KEY_LEN       2048
+ 
++/*
++ * Explanation for the definition of MAX_WRAPPED_KEY_LEN:
++ * 
++ * It's used for internal buffers to transport a wrapped private key.
++ * The value is in BYTES.
++ * We want to define a reasonable upper bound for this value.
++ * Ideally this could be calculated, but in order to simplify the code
++ * we want to estimate the maximum requires size.
++ * See also mozilla bug 655850 for the full explanation.
++ * 
++ * We know the largest wrapped keys are RSA keys.
++ * We'll estimate the maximum size needed for wrapped RSA keys,
++ * and assume it's sufficient for wrapped keys of any type we support.
++ * 
++ * The maximum size of RSA keys in bits is defined elsewhere as
++ *   RSA_MAX_MODULUS_BITS
++ * 
++ * The idea is to define MAX_WRAPPED_KEY_LEN based on the above.
++ * 
++ * A wrapped RSA key requires about
++ *   ( ( RSA_MAX_MODULUS_BITS / 8 ) * 5.5) + 65
++ * bytes.
++ * 
++ * Therefore, a safe upper bound is:
++ *   ( ( RSA_MAX_MODULUS_BITS / 8 ) *8 ) = RSA_MAX_MODULUS_BITS
++ * 
++ */
++#define MAX_WRAPPED_KEY_LEN       RSA_MAX_MODULUS_BITS
+ 
+ #define CRMF_BITS_TO_BYTES(bits) (((bits)+7)/8)
+ #define CRMF_BYTES_TO_BITS(bytes) ((bytes)*8)
diff --git a/nss.spec b/nss.spec
index ed98692..8d50765 100644
--- a/nss.spec
+++ b/nss.spec
@@ -6,7 +6,7 @@
 Summary:          Network Security Services
 Name:             nss
 Version:          3.12.10
-Release:          1%{?dist}
+Release:          2%{?dist}
 License:          MPLv1.1 or GPLv2+ or LGPLv2+
 URL:              http://www.mozilla.org/projects/security/pki/nss/
 Group:            System Environment/Libraries
@@ -44,6 +44,7 @@ Patch6:           nss-enable-pem.patch
 Patch7:           nsspem-642433.patch
 Patch8:           0001-Bug-695011-PEM-logging.patch
 Patch16:          nss-539183.patch
+Patch17:          nss-703658.patch
 
 %description
 Network Security Services (NSS) is a set of libraries designed to
@@ -118,6 +119,7 @@ low level services.
 %patch7 -p0 -b .642433
 %patch8 -p1 -b .695011          
 %patch16 -p0 -b .539183
+%patch17 -p0 -b .703658
 
 
 %build
@@ -511,6 +513,9 @@ rm -rf $RPM_BUILD_ROOT/%{_includedir}/nss3/nsslowhash.h
 
 
 %changelog
+* Tue May 17 2011 Elio Maldonado <emaldona at redhat.com> - 3.12.10-2
+- Fix crmf hard-coded maximum size for wrapped private keys (#703658)
+
 * Fri May 06 2011 Elio Maldonado <emaldona at redhat.com> - 3.12.10-1
 - Update to NSS_3_12_10_RTM