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[crypto] Allow trusted certificates to be stored in non-volatile options

The intention of the existing code (as documented in its own comments)
is that it should be possible to override the list of trusted root
certificates using a "trust" setting held in non-volatile stored
options.  However, the rootcert_init() function currently executes
before any devices have been probed, and so will not be able to
retrieve any such non-volatile stored options.

Fix by executing rootcert_init() only after devices have been probed.
Since startup functions may be executed multiple times (unlike
initialisation functions), add an explicit flag to preserve the
property that rootcert_init() should run only once.

As before, if an explicit root of trust is specified at build time,
then any runtime "trust" setting will be ignored.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown пре 8 година
родитељ
комит
0141ea3a77
1 измењених фајлова са 7 додато и 3 уклоњено
  1. 7
    3
      src/crypto/rootcert.c

+ 7
- 3
src/crypto/rootcert.c Прегледај датотеку

@@ -93,13 +93,14 @@ struct x509_root root_certificates = {
93 93
  * a rebuild.
94 94
  */
95 95
 static void rootcert_init ( void ) {
96
+	static int initialised;
96 97
 	void *external = NULL;
97 98
 	int len;
98 99
 
99 100
 	/* Allow trusted root certificates to be overridden only if
100 101
 	 * not explicitly specified at build time.
101 102
 	 */
102
-	if ( ALLOW_TRUST_OVERRIDE ) {
103
+	if ( ALLOW_TRUST_OVERRIDE && ( ! initialised ) ) {
103 104
 
104 105
 		/* Fetch copy of "trust" setting, if it exists.  This
105 106
 		 * memory will never be freed.
@@ -109,6 +110,9 @@ static void rootcert_init ( void ) {
109 110
 			root_certificates.fingerprints = external;
110 111
 			root_certificates.count = ( len / FINGERPRINT_LEN );
111 112
 		}
113
+
114
+		/* Prevent subsequent modifications */
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+		initialised = 1;
112 116
 	}
113 117
 
114 118
 	DBGC ( &root_certificates, "ROOTCERT using %d %s certificate(s):\n",
@@ -118,6 +122,6 @@ static void rootcert_init ( void ) {
118 122
 }
119 123
 
120 124
 /** Root certificate initialiser */
121
-struct init_fn rootcert_init_fn __init_fn ( INIT_LATE ) = {
122
-	.initialise = rootcert_init,
125
+struct startup_fn rootcert_startup_fn __startup_fn ( STARTUP_LATE ) = {
126
+	.startup = rootcert_init,
123 127
 };

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