[PATCH 5/5] Cryptomount support for hyphens in UUID

[John Lane <grub@jelmail.com>]

From: John Lane <john@lane.uk.net>

---
 grub-core/disk/cryptodisk.c | 20 +++++++++++++++++---
 grub-core/disk/luks.c       | 26 ++++++++------------------
 include/grub/cryptodisk.h   |  2 ++
 3 files changed, 27 insertions(+), 21 deletions(-)

diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
index cd5cfc9..d36d16b 100644
--- a/grub-core/disk/cryptodisk.c
+++ b/grub-core/disk/cryptodisk.c
@@ -113,6 +113,20 @@ gf_mul_be (grub_uint8_t *o, const grub_uint8_t *a, const grub_uint8_t *b)
     }
 }
 
+int
+grub_cryptodisk_uuidcmp(char *uuid_a, char *uuid_b)
+{
+  while ((*uuid_a != '\0') && (*uuid_b != '\0'))
+    {
+      while (*uuid_a == '-') uuid_a++;
+      while (*uuid_b == '-') uuid_b++;
+      if (grub_toupper(*uuid_a) != grub_toupper(*uuid_b)) break;
+      uuid_a++;
+      uuid_b++;
+    }
+  return (*uuid_a == '\0') && (*uuid_b == '\0');
+}
+
 static gcry_err_code_t
 grub_crypto_pcbc_decrypt (grub_crypto_cipher_handle_t cipher,
 			 void *out, void *in, grub_size_t size,
@@ -507,8 +521,8 @@ grub_cryptodisk_open (const char *name, grub_disk_t disk)
   if (grub_memcmp (name, "cryptouuid/", sizeof ("cryptouuid/") - 1) == 0)
     {
       for (dev = cryptodisk_list; dev != NULL; dev = dev->next)
-	if (grub_strcasecmp (name + sizeof ("cryptouuid/") - 1, dev->uuid) == 0)
-	  break;
+        if (grub_cryptodisk_uuidcmp(name + sizeof ("cryptouuid/") - 1, dev->uuid))
+          break;
     }
   else
     {
@@ -739,7 +753,7 @@ grub_cryptodisk_get_by_uuid (const char *uuid)
 {
   grub_cryptodisk_t dev;
   for (dev = cryptodisk_list; dev != NULL; dev = dev->next)
-    if (grub_strcasecmp (dev->uuid, uuid) == 0)
+    if (grub_cryptodisk_uuidcmp(dev->uuid, uuid))
       return dev;
   return NULL;
 }
diff --git a/grub-core/disk/luks.c b/grub-core/disk/luks.c
index 4ebe21b..80a7606 100644
--- a/grub-core/disk/luks.c
+++ b/grub-core/disk/luks.c
@@ -68,9 +68,7 @@ configure_ciphers (grub_disk_t disk, const char *check_uuid,
 		   int check_boot, grub_file_t hdr)
 {
   grub_cryptodisk_t newdev;
-  const char *iptr;
   struct grub_luks_phdr header;
-  char *optr;
   char uuid[sizeof (header.uuid) + 1];
   char ciphername[sizeof (header.cipherName) + 1];
   char ciphermode[sizeof (header.cipherMode) + 1];
@@ -104,22 +102,6 @@ configure_ciphers (grub_disk_t disk, const char *check_uuid,
       || grub_be_to_cpu16 (header.version) != 1)
     return NULL;
 
-  optr = uuid;
-  for (iptr = header.uuid; iptr < &header.uuid[ARRAY_SIZE (header.uuid)];
-       iptr++)
-    {
-      if (*iptr != '-')
-        *optr++ = *iptr;
-    }
-  *optr = 0;
-
-  if (check_uuid && grub_strcasecmp (check_uuid, uuid) != 0)
-    {
-      grub_dprintf ("luks", "%s != %s\n", uuid, check_uuid);
-      return NULL;
-    }
-
-
   /* Make sure that strings are null terminated.  */
   grub_memcpy (ciphername, header.cipherName, sizeof (header.cipherName));
   ciphername[sizeof (header.cipherName)] = 0;
@@ -127,6 +109,14 @@ configure_ciphers (grub_disk_t disk, const char *check_uuid,
   ciphermode[sizeof (header.cipherMode)] = 0;
   grub_memcpy (hashspec, header.hashSpec, sizeof (header.hashSpec));
   hashspec[sizeof (header.hashSpec)] = 0;
+  grub_memcpy (uuid, header.uuid, sizeof (header.uuid));
+  uuid[sizeof (header.uuid)] = 0;
+
+  if ( check_uuid && ! grub_cryptodisk_uuidcmp(check_uuid, uuid))
+    {
+      grub_dprintf ("luks", "%s != %s\n", uuid, check_uuid);
+      return NULL;
+    }
 
   newdev = grub_cryptodisk_create (disk, uuid, ciphername, ciphermode, hashspec);
 
diff --git a/include/grub/cryptodisk.h b/include/grub/cryptodisk.h
index 4076412..a564f2c 100644
--- a/include/grub/cryptodisk.h
+++ b/include/grub/cryptodisk.h
@@ -167,4 +167,6 @@ grub_cryptodisk_t grub_cryptodisk_get_by_source_disk (grub_disk_t disk);
 grub_cryptodisk_t grub_cryptodisk_create (grub_disk_t disk, char *uuid,
 				   char *ciphername, char *ciphermode, char *digest);
 
+int
+grub_cryptodisk_uuidcmp(char *uuid_a, char *uuid_b);
 #endif
-- 
2.1.2