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Fix for Bug #41597 - After rename of user, there are additional grants when

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grants are reapplied.


After renaming a user and trying to re-apply grants results in additional
grants.

This is because we use username as part of the key for GRANT_TABLE structure.
When the user is renamed, we only change the username stored and the hash key
still contains the old user name and this results in the extra privileges

Fixed by rebuilding the hash key and updating the column_priv_hash structure
when the user is renamed
This commit is contained in:
Satya B
2009-10-20 11:47:57 +05:30
parent 60132409f8
commit b2cd0a0f15
3 changed files with 107 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
sql/sql_acl.cc
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@ -2096,6 +2096,8 @@ public:
GRANT_NAME (TABLE *form);
virtual ~GRANT_NAME() {};
virtual bool ok() { return privs != 0; }
void set_user_details(const char *h, const char *d,
const char *u, const char *t);
};
@ -2113,27 +2115,36 @@ public:
};
GRANT_NAME::GRANT_NAME(const char *h, const char *d,const char *u,
const char *t, ulong p)
:privs(p)
void GRANT_NAME::set_user_details(const char *h, const char *d,
const char *u, const char *t)
{
/* Host given by user */
update_hostname(&host, strdup_root(&memex, h));
db = strdup_root(&memex,d);
if (db != d)
{
db= strdup_root(&memex, d);
if (lower_case_table_names)
my_casedn_str(files_charset_info, db);
}
user = strdup_root(&memex,u);
sort= get_sort(3,host.hostname,db,user);
tname= strdup_root(&memex,t);
if (lower_case_table_names)
if (tname != t)
{
my_casedn_str(files_charset_info, db);
my_casedn_str(files_charset_info, tname);
tname= strdup_root(&memex, t);
if (lower_case_table_names)
my_casedn_str(files_charset_info, tname);
}
key_length =(uint) strlen(d)+(uint) strlen(u)+(uint) strlen(t)+3;
hash_key = (char*) alloc_root(&memex,key_length);
strmov(strmov(strmov(hash_key,user)+1,db)+1,tname);
}
GRANT_NAME::GRANT_NAME(const char *h, const char *d,const char *u,
const char *t, ulong p)
:db(0), tname(0), privs(p)
{
set_user_details(h, d, u, t);
}
GRANT_TABLE::GRANT_TABLE(const char *h, const char *d,const char *u,
const char *t, ulong p, ulong c)
@ -5183,9 +5194,20 @@ static int handle_grant_struct(uint struct_no, bool drop,
case 2:
case 3:
grant_name->user= strdup_root(&mem, user_to->user.str);
update_hostname(&grant_name->host,
strdup_root(&mem, user_to->host.str));
/*
Update the grant structure with the new user name and
host name
*/
grant_name->set_user_details(user_to->host.str, grant_name->db,
user_to->user.str, grant_name->tname);
/*
Since username is part of the hash key, when the user name
is renamed, the hash key is changed. Update the hash to
ensure that the position matches the new hash key value
*/
hash_update(&column_priv_hash, (byte *)grant_name,
grant_name->hash_key, grant_name->key_length);
break;
}
}