[tor-commits] [tor/maint-0.3.1] hs-v3: Add an extra white-space when parsing descriptor

[nickm@xxxxxxxxxxxxxx]

commit 6e99286d45be482effe47feb057948b98495a49f
Author: David Goulet <dgoulet@xxxxxxxxxxxxxx>
Date:   Thu May 10 09:16:50 2018 -0400

    hs-v3: Add an extra white-space when parsing descriptor
    
    The specification describes the signature token to be right after a newline
    (\n) then the token "signature" and then a white-space followed by the encoded
    signature.
    
    This commit makes sure that when we parse the signature from the descriptor,
    we are always looking for that extra white-space at the end of the token.
    
    It will allow us also to support future fields that might start with
    "signature".
    
    Fixes #26069
    
    Signed-off-by: David Goulet <dgoulet@xxxxxxxxxxxxxx>
---
 changes/bug26069       | 5 +++++
 src/or/hs_descriptor.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/changes/bug26069 b/changes/bug26069
new file mode 100644
index 000000000..192e97d78
--- /dev/null
+++ b/changes/bug26069
@@ -0,0 +1,5 @@
+  o Minor bugfixes (hidden service v3):
+    - When parsing the descriptor signature, look for the token plus an extra
+      white-space at the end. This is more correct but also will allow us to
+      support new fields that might start with "signature". Fixes bug 26069;
+      bugfix on 0.3.0.1-alpha.
diff --git a/src/or/hs_descriptor.c b/src/or/hs_descriptor.c
index fae527b2d..3ec02618b 100644
--- a/src/or/hs_descriptor.c
+++ b/src/or/hs_descriptor.c
@@ -1849,7 +1849,7 @@ desc_sig_is_valid(const char *b64_sig,
   }
 
   /* Find the start of signature. */
-  sig_start = tor_memstr(encoded_desc, encoded_len, "\n" str_signature);
+  sig_start = tor_memstr(encoded_desc, encoded_len, "\n" str_signature " ");
   /* Getting here means the token parsing worked for the signature so if we
    * can't find the start of the signature, we have a code flow issue. */
   if (!sig_start) {



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