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3002 lines (2614 loc) · 93 KB
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/* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql_show.h" /* append_identifier */
#include "log.h" /* sql_print_warning */
#include "sql_base.h" /* MYSQL_LOCK_IGNORE_TIMEOUT */
#include "key.h" /* key_copy, key_cmp_if_same */
/* key_restore */
#include "auth_internal.h"
#include "sql_auth_cache.h"
#include "sql_authentication.h"
#include "sql_time.h"
#include "sql_plugin.h" // lock_plugin_data etc.
#include "debug_sync.h"
#include "sql_user_table.h"
#define INVALID_DATE "0000-00-00 00:00:00"
#include <algorithm>
#include <functional>
using std::min;
struct ACL_internal_schema_registry_entry
{
const LEX_STRING *m_name;
const ACL_internal_schema_access *m_access;
};
/**
Internal schema registered.
Currently, this is only:
- performance_schema
- information_schema,
This can be reused later for:
- mysql
*/
static ACL_internal_schema_registry_entry registry_array[2];
static uint m_registry_array_size= 0;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
MEM_ROOT global_acl_memory;
MEM_ROOT memex;
Prealloced_array<ACL_USER, ACL_PREALLOC_SIZE> *acl_users= NULL;
Prealloced_array<ACL_PROXY_USER, ACL_PREALLOC_SIZE> *acl_proxy_users= NULL;
Prealloced_array<ACL_DB, ACL_PREALLOC_SIZE> *acl_dbs= NULL;
Prealloced_array<ACL_HOST_AND_IP, ACL_PREALLOC_SIZE> *acl_wild_hosts= NULL;
HASH column_priv_hash, proc_priv_hash, func_priv_hash;
hash_filo *acl_cache;
HASH acl_check_hosts;
bool initialized=0;
bool allow_all_hosts=1;
uint grant_version=0; /* Version of priv tables */
my_bool validate_user_plugins= TRUE;
/**
Flag to track if rwlocks in ACL subsystem were initialized.
Necessary because acl_free() can be called in some error scenarios
without prior call to acl_init().
*/
bool rwlocks_initialized= false;
const uint LOCK_GRANT_PARTITIONS= 32;
Partitioned_rwlock LOCK_grant;
#define FIRST_NON_YN_FIELD 26
#define IP_ADDR_STRLEN (3 + 1 + 3 + 1 + 3 + 1 + 3)
#define ACL_KEY_LENGTH (IP_ADDR_STRLEN + 1 + NAME_LEN + \
1 + USERNAME_LENGTH + 1)
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
/**
Add an internal schema to the registry.
@param name the schema name
@param access the schema ACL specific rules
*/
void ACL_internal_schema_registry::register_schema
(const LEX_STRING &name, const ACL_internal_schema_access *access)
{
DBUG_ASSERT(m_registry_array_size < array_elements(registry_array));
/* Not thread safe, and does not need to be. */
registry_array[m_registry_array_size].m_name= &name;
registry_array[m_registry_array_size].m_access= access;
m_registry_array_size++;
}
/**
Search per internal schema ACL by name.
@param name a schema name
@return per schema rules, or NULL
*/
const ACL_internal_schema_access *
ACL_internal_schema_registry::lookup(const char *name)
{
DBUG_ASSERT(name != NULL);
uint i;
for (i= 0; i<m_registry_array_size; i++)
{
if (my_strcasecmp(system_charset_info, registry_array[i].m_name->str,
name) == 0)
return registry_array[i].m_access;
}
return NULL;
}
const char *
ACL_HOST_AND_IP::calc_ip(const char *ip_arg, long *val, char end)
{
long ip_val,tmp;
if (!(ip_arg=str2int(ip_arg,10,0,255,&ip_val)) || *ip_arg != '.')
return 0;
ip_val<<=24;
if (!(ip_arg=str2int(ip_arg+1,10,0,255,&tmp)) || *ip_arg != '.')
return 0;
ip_val+=tmp<<16;
if (!(ip_arg=str2int(ip_arg+1,10,0,255,&tmp)) || *ip_arg != '.')
return 0;
ip_val+=tmp<<8;
if (!(ip_arg=str2int(ip_arg+1,10,0,255,&tmp)) || *ip_arg != end)
return 0;
*val=ip_val+tmp;
return ip_arg;
}
/**
@brief Update the hostname. Updates ip and ip_mask accordingly.
@param host_arg Value to be stored
*/
void
ACL_HOST_AND_IP::update_hostname(const char *host_arg)
{
hostname=(char*) host_arg; // This will not be modified!
hostname_length= hostname ? strlen( hostname ) : 0;
if (!host_arg ||
(!(host_arg=(char*) calc_ip(host_arg,&ip,'/')) ||
!(host_arg=(char*) calc_ip(host_arg+1,&ip_mask,'\0'))))
{
ip= ip_mask=0; // Not a masked ip
}
}
/*
@brief Comparing of hostnames
@param host_arg Hostname to be compared with
@param ip_arg IP address to be compared with
@notes
A hostname may be of type:
1) hostname (May include wildcards); monty.pp.sci.fi
2) ip (May include wildcards); 192.168.0.0
3) ip/netmask 192.168.0.0/255.255.255.0
A net mask of 0.0.0.0 is not allowed.
@return
true if matched
false if not matched
*/
bool
ACL_HOST_AND_IP::compare_hostname(const char *host_arg, const char *ip_arg)
{
long tmp;
if (ip_mask && ip_arg && calc_ip(ip_arg,&tmp,'\0'))
{
return (tmp & ip_mask) == ip;
}
return (!hostname ||
(host_arg &&
!wild_case_compare(system_charset_info, host_arg, hostname)) ||
(ip_arg && !wild_compare(ip_arg, hostname, 0)));
}
ACL_USER *
ACL_USER::copy(MEM_ROOT *root)
{
ACL_USER *dst= (ACL_USER *) alloc_root(root, sizeof(ACL_USER));
if (!dst)
return 0;
*dst= *this;
dst->user= safe_strdup_root(root, user);
dst->ssl_cipher= safe_strdup_root(root, ssl_cipher);
dst->x509_issuer= safe_strdup_root(root, x509_issuer);
dst->x509_subject= safe_strdup_root(root, x509_subject);
/*
If the plugin is built in we don't need to reallocate the name of the
plugin.
*/
if (auth_plugin_is_built_in(dst->plugin.str))
dst->plugin= plugin;
else
{
dst->plugin.str= strmake_root(root, plugin.str, plugin.length);
dst->plugin.length= plugin.length;
}
dst->auth_string.str= safe_strdup_root(root, auth_string.str);
dst->host.update_hostname(safe_strdup_root(root, host.get_host()));
return dst;
}
void
ACL_PROXY_USER::init(const char *host_arg, const char *user_arg,
const char *proxied_host_arg,
const char *proxied_user_arg, bool with_grant_arg)
{
user= (user_arg && *user_arg) ? user_arg : NULL;
host.update_hostname ((host_arg && *host_arg) ? host_arg : NULL);
proxied_user= (proxied_user_arg && *proxied_user_arg) ?
proxied_user_arg : NULL;
proxied_host.update_hostname ((proxied_host_arg && *proxied_host_arg) ?
proxied_host_arg : NULL);
with_grant= with_grant_arg;
sort= get_sort(4, host.get_host(), user,
proxied_host.get_host(), proxied_user);
}
void
ACL_PROXY_USER::init(MEM_ROOT *mem, const char *host_arg, const char *user_arg,
const char *proxied_host_arg,
const char *proxied_user_arg, bool with_grant_arg)
{
init ((host_arg && *host_arg) ? strdup_root (mem, host_arg) : NULL,
(user_arg && *user_arg) ? strdup_root (mem, user_arg) : NULL,
(proxied_host_arg && *proxied_host_arg) ?
strdup_root (mem, proxied_host_arg) : NULL,
(proxied_user_arg && *proxied_user_arg) ?
strdup_root (mem, proxied_user_arg) : NULL,
with_grant_arg);
}
void
ACL_PROXY_USER::init(TABLE *table, MEM_ROOT *mem)
{
init (get_field(mem, table->field[MYSQL_PROXIES_PRIV_HOST]),
get_field(mem, table->field[MYSQL_PROXIES_PRIV_USER]),
get_field(mem, table->field[MYSQL_PROXIES_PRIV_PROXIED_HOST]),
get_field(mem, table->field[MYSQL_PROXIES_PRIV_PROXIED_USER]),
table->field[MYSQL_PROXIES_PRIV_WITH_GRANT]->val_int() != 0);
}
bool
ACL_PROXY_USER::check_validity(bool check_no_resolve)
{
if (check_no_resolve &&
(hostname_requires_resolving(host.get_host()) ||
hostname_requires_resolving(proxied_host.get_host())))
{
sql_print_warning("'proxies_priv' entry '%s@%s %s@%s' "
"ignored in --skip-name-resolve mode.",
proxied_user ? proxied_user : "",
proxied_host.get_host() ? proxied_host.get_host() : "",
user ? user : "",
host.get_host() ? host.get_host() : "");
}
return FALSE;
}
bool
ACL_PROXY_USER::matches(const char *host_arg, const char *user_arg,
const char *ip_arg, const char *proxied_user_arg,
bool any_proxy_user)
{
DBUG_ENTER("ACL_PROXY_USER::matches");
DBUG_PRINT("info", ("compare_hostname(%s,%s,%s) &&"
"compare_hostname(%s,%s,%s) &&"
"wild_compare (%s,%s) &&"
"wild_compare (%s,%s)",
host.get_host() ? host.get_host() : "<NULL>",
host_arg ? host_arg : "<NULL>",
ip_arg ? ip_arg : "<NULL>",
proxied_host.get_host() ? proxied_host.get_host() : "<NULL>",
host_arg ? host_arg : "<NULL>",
ip_arg ? ip_arg : "<NULL>",
user_arg ? user_arg : "<NULL>",
user ? user : "<NULL>",
proxied_user_arg ? proxied_user_arg : "<NULL>",
proxied_user ? proxied_user : "<NULL>"));
DBUG_RETURN(host.compare_hostname(host_arg, ip_arg) &&
proxied_host.compare_hostname(host_arg, ip_arg) &&
(!user ||
(user_arg && !wild_compare(user_arg, user, TRUE))) &&
(any_proxy_user || !proxied_user ||
(proxied_user && !wild_compare(proxied_user_arg, proxied_user,
TRUE))));
}
bool
ACL_PROXY_USER::pk_equals(ACL_PROXY_USER *grant)
{
DBUG_ENTER("pk_equals");
DBUG_PRINT("info", ("strcmp(%s,%s) &&"
"strcmp(%s,%s) &&"
"wild_compare (%s,%s) &&"
"wild_compare (%s,%s)",
user ? user : "<NULL>",
grant->user ? grant->user : "<NULL>",
proxied_user ? proxied_user : "<NULL>",
grant->proxied_user ? grant->proxied_user : "<NULL>",
host.get_host() ? host.get_host() : "<NULL>",
grant->host.get_host() ? grant->host.get_host() : "<NULL>",
proxied_host.get_host() ? proxied_host.get_host() : "<NULL>",
grant->proxied_host.get_host() ?
grant->proxied_host.get_host() : "<NULL>"));
DBUG_RETURN(auth_element_equals(user, grant->user) &&
auth_element_equals(proxied_user, grant->proxied_user) &&
auth_element_equals(host.get_host(), grant->host.get_host()) &&
auth_element_equals(proxied_host.get_host(),
grant->proxied_host.get_host()));
}
void
ACL_PROXY_USER::print_grant(String *str)
{
str->append(STRING_WITH_LEN("GRANT PROXY ON '"));
if (proxied_user)
str->append(proxied_user, strlen(proxied_user));
str->append(STRING_WITH_LEN("'@'"));
if (proxied_host.get_host())
str->append(proxied_host.get_host(), strlen(proxied_host.get_host()));
str->append(STRING_WITH_LEN("' TO '"));
if (user)
str->append(user, strlen(user));
str->append(STRING_WITH_LEN("'@'"));
if (host.get_host())
str->append(host.get_host(), strlen(host.get_host()));
str->append(STRING_WITH_LEN("'"));
if (with_grant)
str->append(STRING_WITH_LEN(" WITH GRANT OPTION"));
}
int
ACL_PROXY_USER::store_pk(TABLE *table,
const LEX_CSTRING &host,
const LEX_CSTRING &user,
const LEX_CSTRING &proxied_host,
const LEX_CSTRING &proxied_user)
{
DBUG_ENTER("ACL_PROXY_USER::store_pk");
DBUG_PRINT("info", ("host=%s, user=%s, proxied_host=%s, proxied_user=%s",
host.str ? host.str : "<NULL>",
user.str ? user.str : "<NULL>",
proxied_host.str ? proxied_host.str : "<NULL>",
proxied_user.str ? proxied_user.str : "<NULL>"));
if (table->field[MYSQL_PROXIES_PRIV_HOST]->store(host.str,
host.length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_USER]->store(user.str,
user.length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_PROXIED_HOST]->store(proxied_host.str,
proxied_host.length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_PROXIED_USER]->store(proxied_user.str,
proxied_user.length,
system_charset_info))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
int
ACL_PROXY_USER::store_with_grant(TABLE * table,
bool with_grant)
{
DBUG_ENTER("ACL_PROXY_USER::store_with_grant");
DBUG_PRINT("info", ("with_grant=%s", with_grant ? "TRUE" : "FALSE"));
if (table->field[MYSQL_PROXIES_PRIV_WITH_GRANT]->store(with_grant ? 1 : 0,
TRUE))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
int
ACL_PROXY_USER::store_data_record(TABLE *table,
const LEX_CSTRING &host,
const LEX_CSTRING &user,
const LEX_CSTRING &proxied_host,
const LEX_CSTRING &proxied_user,
bool with_grant,
const char *grantor)
{
DBUG_ENTER("ACL_PROXY_USER::store_pk");
if (store_pk(table, host, user, proxied_host, proxied_user))
DBUG_RETURN(TRUE);
if (store_with_grant(table, with_grant))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_GRANTOR]->store(grantor,
strlen(grantor),
system_charset_info))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
int wild_case_compare(CHARSET_INFO *cs, const char *str,const char *wildstr)
{
int flag;
DBUG_ENTER("wild_case_compare");
DBUG_PRINT("enter",("str: '%s' wildstr: '%s'",str,wildstr));
while (*wildstr)
{
while (*wildstr && *wildstr != wild_many && *wildstr != wild_one)
{
if (*wildstr == wild_prefix && wildstr[1])
wildstr++;
if (my_toupper(cs, *wildstr++) !=
my_toupper(cs, *str++)) DBUG_RETURN(1);
}
if (! *wildstr ) DBUG_RETURN (*str != 0);
if (*wildstr++ == wild_one)
{
if (! *str++) DBUG_RETURN (1); /* One char; skip */
}
else
{ /* Found '*' */
if (!*wildstr) DBUG_RETURN(0); /* '*' as last char: OK */
flag=(*wildstr != wild_many && *wildstr != wild_one);
do
{
if (flag)
{
char cmp;
if ((cmp= *wildstr) == wild_prefix && wildstr[1])
cmp=wildstr[1];
cmp=my_toupper(cs, cmp);
while (*str && my_toupper(cs, *str) != cmp)
str++;
if (!*str) DBUG_RETURN (1);
}
if (wild_case_compare(cs, str,wildstr) == 0) DBUG_RETURN (0);
} while (*str++);
DBUG_RETURN(1);
}
}
DBUG_RETURN (*str != '\0');
}
/*
Return a number which, if sorted 'desc', puts strings in this order:
no wildcards
strings containg wildcards and non-wildcard characters
single muilt-wildcard character('%')
empty string
*/
ulong get_sort(uint count,...)
{
va_list args;
va_start(args,count);
ulong sort=0;
/* Should not use this function with more than 4 arguments for compare. */
DBUG_ASSERT(count <= 4);
while (count--)
{
char *start, *str= va_arg(args,char*);
uint chars= 0;
uint wild_pos= 0;
/*
wild_pos
0 if string is empty
1 if string is a single muilt-wildcard
character('%')
first wildcard position + 1 if string containg wildcards and
non-wildcard characters
*/
if ((start= str))
{
for (; *str ; str++)
{
if (*str == wild_prefix && str[1])
str++;
else if (*str == wild_many || *str == wild_one)
{
wild_pos= (uint) (str - start) + 1;
if (!(wild_pos == 1 && *str == wild_many && *(++str) == '\0'))
wild_pos++;
break;
}
chars= 128; // Marker that chars existed
}
}
sort= (sort << 8) + (wild_pos ? min(wild_pos, 127U) : chars);
}
va_end(args);
return sort;
}
/**
Check if the given host name needs to be resolved or not.
Host name has to be resolved if it actually contains *name*.
For example:
192.168.1.1 --> FALSE
192.168.1.0/255.255.255.0 --> FALSE
% --> FALSE
192.168.1.% --> FALSE
AB% --> FALSE
AAAAFFFF --> TRUE (Hostname)
AAAA:FFFF:1234:5678 --> FALSE
::1 --> FALSE
This function does not check if the given string is a valid host name or
not. It assumes that the argument is a valid host name.
@param hostname the string to check.
@return a flag telling if the argument needs to be resolved or not.
@retval TRUE the argument is a host name and needs to be resolved.
@retval FALSE the argument is either an IP address, or a patter and
should not be resolved.
*/
bool hostname_requires_resolving(const char *hostname)
{
/* called only for --skip-name-resolve */
DBUG_ASSERT(specialflag & SPECIAL_NO_RESOLVE);
if (!hostname)
return FALSE;
/*
If the string contains any of {':', '%', '_', '/'}, it is definitely
not a host name:
- ':' means that the string is an IPv6 address;
- '%' or '_' means that the string is a pattern;
- '/' means that the string is an IPv4 network address;
*/
for (const char *p= hostname; *p; ++p)
{
switch (*p) {
case ':':
case '%':
case '_':
case '/':
return FALSE;
}
}
/*
Now we have to tell a host name (ab.cd, 12.ab) from an IPv4 address
(12.34.56.78). The assumption is that if the string contains only
digits and dots, it is an IPv4 address. Otherwise -- a host name.
*/
for (const char *p= hostname; *p; ++p)
{
if (*p != '.' && !my_isdigit(&my_charset_latin1, *p))
return TRUE; /* a "letter" has been found. */
}
return FALSE; /* all characters are either dots or digits. */
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static uchar* get_key_column(GRANT_COLUMN *buff, size_t *length,
my_bool not_used MY_ATTRIBUTE((unused)))
{
*length=buff->key_length;
return (uchar*) buff->column;
}
uchar* get_grant_table(GRANT_NAME *buff, size_t *length,
my_bool not_used MY_ATTRIBUTE((unused)))
{
*length=buff->key_length;
return (uchar*) buff->hash_key;
}
GRANT_COLUMN::GRANT_COLUMN(String &c, ulong y) :rights (y)
{
column= (char*) memdup_root(&memex,c.ptr(), key_length=c.length());
}
void GRANT_NAME::set_user_details(const char *h, const char *d,
const char *u, const char *t,
bool is_routine)
{
/* Host given by user */
host.update_hostname(strdup_root(&memex, h));
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.get_host(),db,user);
if (tname != t)
{
tname= strdup_root(&memex, t);
if (lower_case_table_names || is_routine)
my_casedn_str(files_charset_info, tname);
}
key_length= strlen(d) + strlen(u)+ strlen(t)+3;
hash_key= (char*) alloc_root(&memex,key_length);
my_stpcpy(my_stpcpy(my_stpcpy(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, bool is_routine)
:db(0), tname(0), privs(p)
{
set_user_details(h, d, u, t, is_routine);
}
GRANT_TABLE::GRANT_TABLE(const char *h, const char *d,const char *u,
const char *t, ulong p, ulong c)
:GRANT_NAME(h,d,u,t,p, FALSE), cols(c)
{
(void) my_hash_init2(&hash_columns,4,system_charset_info,
0,0,0, (my_hash_get_key) get_key_column,0,0,
key_memory_acl_memex);
}
GRANT_NAME::GRANT_NAME(TABLE *form, bool is_routine)
{
host.update_hostname(get_field(&memex, form->field[0]));
db= get_field(&memex,form->field[1]);
user= get_field(&memex,form->field[2]);
if (!user)
user= (char*) "";
sort= get_sort(3, host.get_host(), db, user);
tname= get_field(&memex,form->field[3]);
if (!db || !tname) {
/* Wrong table row; Ignore it */
privs= 0;
return; /* purecov: inspected */
}
if (lower_case_table_names)
{
my_casedn_str(files_charset_info, db);
}
if (lower_case_table_names || is_routine)
{
my_casedn_str(files_charset_info, tname);
}
key_length= (strlen(db) + strlen(user) + strlen(tname) + 3);
hash_key= (char*) alloc_root(&memex, key_length);
my_stpcpy(my_stpcpy(my_stpcpy(hash_key,user)+1,db)+1,tname);
if (form->field[MYSQL_TABLES_PRIV_FIELD_TABLE_PRIV])
{
privs = (ulong) form->field[MYSQL_TABLES_PRIV_FIELD_TABLE_PRIV]->val_int();
privs = fix_rights_for_table(privs);
}
}
GRANT_TABLE::GRANT_TABLE(TABLE *form)
:GRANT_NAME(form, false)
{
if (!db || !tname)
{
/* Wrong table row; Ignore it */
my_hash_clear(&hash_columns); /* allow for destruction */
cols= 0;
return;
}
if (form->field[MYSQL_TABLES_PRIV_FIELD_COLUMN_PRIV])
{
cols= (ulong) form->field[MYSQL_TABLES_PRIV_FIELD_COLUMN_PRIV]->val_int();
cols = fix_rights_for_column(cols);
}
else
cols= 0;
(void) my_hash_init2(&hash_columns,4,system_charset_info,
0,0,0, (my_hash_get_key) get_key_column,0,0,
key_memory_acl_memex);
}
GRANT_TABLE::~GRANT_TABLE()
{
my_hash_free(&hash_columns);
}
bool GRANT_TABLE::init(TABLE *col_privs)
{
int error;
if (cols)
{
uchar key[MAX_KEY_LENGTH];
uint key_prefix_len;
if (!col_privs->key_info)
{
my_error(ER_MISSING_KEY, MYF(0), col_privs->s->db.str,
col_privs->s->table_name.str);
return true;
}
KEY_PART_INFO *key_part= col_privs->key_info->key_part;
col_privs->field[0]->store(host.get_host(),
host.get_host() ? host.get_host_len() : 0,
system_charset_info);
col_privs->field[1]->store(db, strlen(db), system_charset_info);
col_privs->field[2]->store(user, strlen(user), system_charset_info);
col_privs->field[3]->store(tname, strlen(tname), system_charset_info);
key_prefix_len= (key_part[0].store_length +
key_part[1].store_length +
key_part[2].store_length +
key_part[3].store_length);
key_copy(key, col_privs->record[0], col_privs->key_info, key_prefix_len);
col_privs->field[4]->store("", 0, &my_charset_latin1);
error= col_privs->file->ha_index_init(0, 1);
if (error)
{
acl_print_ha_error(col_privs, error);
return true;
}
error=
col_privs->file->ha_index_read_map(col_privs->record[0], (uchar*) key,
(key_part_map)15, HA_READ_KEY_EXACT);
DBUG_EXECUTE_IF("se_error_grant_table_init_read",
error= HA_ERR_LOCK_WAIT_TIMEOUT;);
if (error)
{
bool ret= false;
cols= 0;
if (error != HA_ERR_KEY_NOT_FOUND && error != HA_ERR_END_OF_FILE)
{
acl_print_ha_error(col_privs, error);
ret= true;
}
col_privs->file->ha_index_end();
return ret;
}
do
{
String *res,column_name;
GRANT_COLUMN *mem_check;
/* As column name is a string, we don't have to supply a buffer */
res= col_privs->field[4]->val_str(&column_name);
ulong priv= (ulong) col_privs->field[6]->val_int();
if (!(mem_check= new GRANT_COLUMN(*res,
fix_rights_for_column(priv))) ||
my_hash_insert(&hash_columns, (uchar *) mem_check))
{
/* Don't use this entry */
col_privs->file->ha_index_end();
return true;
}
error= col_privs->file->ha_index_next(col_privs->record[0]);
DBUG_EXECUTE_IF("se_error_grant_table_init_read_next",
error= HA_ERR_LOCK_WAIT_TIMEOUT;);
if (error && error != HA_ERR_END_OF_FILE)
{
acl_print_ha_error(col_privs, error);
col_privs->file->ha_index_end();
return true;
}
}
while (!error && !key_cmp_if_same(col_privs,key,0,key_prefix_len));
col_privs->file->ha_index_end();
}
return false;
}
/*
Find first entry that matches the current user
*/
ACL_USER *
find_acl_user(const char *host, const char *user, my_bool exact)
{
DBUG_ENTER("find_acl_user");
DBUG_PRINT("enter",("host: '%s' user: '%s'",host,user));
mysql_mutex_assert_owner(&acl_cache->lock);
if (likely(acl_users))
{
for (ACL_USER *acl_user= acl_users->begin();
acl_user != acl_users->end(); ++acl_user)
{
DBUG_PRINT("info",("strcmp('%s','%s'), compare_hostname('%s','%s'),",
user, acl_user->user ? acl_user->user : "",
host,
acl_user->host.get_host() ? acl_user->host.get_host() :
""));
if ((!acl_user->user && !user[0]) ||
(acl_user->user && !strcmp(user,acl_user->user)))
{
if (exact ? !my_strcasecmp(system_charset_info, host,
acl_user->host.get_host() ?
acl_user->host.get_host() : "") :
acl_user->host.compare_hostname(host,host))
{
DBUG_RETURN(acl_user);
}
}
}
}
DBUG_RETURN(0);
}
/*
Find user in ACL
SYNOPSIS
is_acl_user()
host host name
user user name
RETURN
FALSE user not fond
TRUE there are such user
*/
bool is_acl_user(const char *host, const char *user)
{
bool res;
/* --skip-grants */
if (!initialized)
return TRUE;
mysql_mutex_lock(&acl_cache->lock);
res= find_acl_user(host, user, TRUE) != NULL;
mysql_mutex_unlock(&acl_cache->lock);
return res;
}
/**
Validate if a user can proxy as another user
@thd current thread
@param user the logged in user (proxy user)
@param authenticated_as the effective user a plugin is trying to
impersonate as (proxied user)
@return proxy user definition
@retval NULL proxy user definition not found or not applicable
@retval non-null the proxy user data
*/
ACL_PROXY_USER *
acl_find_proxy_user(const char *user, const char *host, const char *ip,
char *authenticated_as, bool *proxy_used)
{
/* if the proxied and proxy user are the same return OK */
DBUG_ENTER("acl_find_proxy_user");
DBUG_PRINT("info", ("user=%s host=%s ip=%s authenticated_as=%s",
user, host, ip, authenticated_as));
if (!strcmp(authenticated_as, user))
{
DBUG_PRINT ("info", ("user is the same as authenticated_as"));
DBUG_RETURN (NULL);
}
bool find_any = check_proxy_users && !*authenticated_as;
if(!find_any)
*proxy_used= TRUE;
for (ACL_PROXY_USER *proxy= acl_proxy_users->begin();
proxy != acl_proxy_users->end(); ++proxy)
{
if (proxy->matches(host, user, ip, authenticated_as, find_any))
{
DBUG_PRINT("info", ("proxy matched=%s@%s",
proxy->get_proxied_user(),
proxy->get_proxied_host()));
if (!find_any)
{
DBUG_PRINT("info", ("returning specific match as authenticated_as was specified"));
*proxy_used = TRUE;
DBUG_RETURN(proxy);
}
else
{
// we never use anonymous users when mapping
// proxy users for internal plugins:
if (strcmp(proxy->get_proxied_user() ?
proxy->get_proxied_user() : "", ""))
{
if (find_acl_user(
proxy->get_proxied_host(),
proxy->get_proxied_user(),
TRUE))
{
DBUG_PRINT("info", ("setting proxy_used to true, as \
find_all search matched real user=%s host=%s",
proxy->get_proxied_user(),
proxy->get_proxied_host()));
*proxy_used = TRUE;
strcpy(authenticated_as, proxy->get_proxied_user());
}
else
{
DBUG_PRINT("info", ("skipping match because ACL user \
does not exist, looking for next match to map"));
}
if (*proxy_used)
{
DBUG_PRINT("info", ("returning matching user"));
DBUG_RETURN(proxy);
}
}
}
}
}
DBUG_PRINT("info", ("No matching users found, returning null"));
DBUG_RETURN(NULL);
}
static uchar* acl_entry_get_key(acl_entry *entry, size_t *length,
my_bool not_used MY_ATTRIBUTE((unused)))
{
*length=(uint) entry->length;
return (uchar*) entry->key;
}
static uchar* check_get_key(ACL_USER *buff, size_t *length,
my_bool not_used MY_ATTRIBUTE((unused)))
{
*length=buff->host.get_host_len();
return (uchar*) buff->host.get_host();
}
/*
Get privilege for a host, user and db combination
as db_is_pattern changes the semantics of comparison,
acl_cache is not used if db_is_pattern is set.
*/
ulong acl_get(const char *host, const char *ip,
const char *user, const char *db, my_bool db_is_pattern)
{
ulong host_access= ~(ulong)0, db_access= 0;
size_t key_length, copy_length;
char key[ACL_KEY_LENGTH],*tmp_db,*end;
acl_entry *entry;
DBUG_ENTER("acl_get");
copy_length= (strlen(ip ? ip : "") +
strlen(user ? user : "") +
strlen(db ? db : "")) + 2; /* Added 2 at the end to avoid
buffer overflow at strmov()*/
/*
Make sure that my_stpcpy() operations do not result in buffer overflow.
*/
if (copy_length >= ACL_KEY_LENGTH)