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server: Make sure CAP_CAP and CAP_TS6 are non-zero.

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A zero CAP_CAP caused duplicate CAPAB to go undetected, allowing a
mismatch between what is sent out via ENCAP GCAP and what applies locally.

A zero CAP_TS6 allowed server connections without SID (with a valid
connect block).
This commit is contained in:
Jilles Tjoelker 2012-12-18 17:03:59 +01:00
parent 71eb2bb99b
commit 22cae20f02
3 changed files with 20 additions and 0 deletions
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1
include/capability.h
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@ -26,6 +26,7 @@ struct CapabilityEntry;
extern unsigned int capability_get(struct CapabilityIndex *idx, const char *cap);
extern unsigned int capability_put(struct CapabilityIndex *idx, const char *cap);
extern unsigned int capability_put_anonymous(struct CapabilityIndex *idx);
extern void capability_orphan(struct CapabilityIndex *idx, const char *cap);
extern void capability_require(struct CapabilityIndex *idx, const char *cap);

15
src/capability.c
View file

@ -83,6 +83,21 @@ capability_put(struct CapabilityIndex *idx, const char *cap)
return (1 << entry->value);
}
unsigned int
capability_put_anonymous(struct CapabilityIndex *idx)
{
unsigned int value;
s_assert(idx != NULL);
if (!idx->highest_bit)
return 0xFFFFFFFF;
value = 1 << idx->highest_bit;
idx->highest_bit++;
if (idx->highest_bit % (sizeof(unsigned int) * 8) == 0)
idx->highest_bit = 0;
return value;
}
void
capability_orphan(struct CapabilityIndex *idx, const char *cap)
{

4
src/s_serv.c
View file

@ -102,6 +102,10 @@ init_builtin_capabs(void)
{
serv_capindex = capability_index_create("server capabilities");
/* These two are not set via CAPAB/GCAP keywords. */
CAP_CAP = capability_put_anonymous(serv_capindex);
CAP_TS6 = capability_put_anonymous(serv_capindex);
CAP_QS = capability_put(serv_capindex, "QS");
CAP_EX = capability_put(serv_capindex, "EX");
CAP_CHW = capability_put(serv_capindex, "CHW");