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hyperv: Escape WQL queries

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The code was vulnerable to SQL injection. Likely not a security issue due to
WMI SQL and other constraints but still lame. For example:

  virsh # dominfo \"
  error: failed to get domain '"'
  error: internal error: SOAP fault during enumeration: code 's:Sender', subcode
  'n:CannotProcessFilter', reason 'The data source could not process the filter.
  The filter might be missing or it might be invalid. Change the filter and try
  the request again.  ', detail 'The WS-Management service cannot process the
  request. The WQL query is invalid. '

This commit fixes the Hyper-V driver by escaping all WMI SQL string parameters.

The same command with the fix:

  virsh # dominfo \"
  error: failed to get domain '"'
  error: Domain not found: No domain with name "

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
This commit is contained in:
Ladi Prosek 2017-10-06 08:47:34 +02:00 committed by John Ferlan
parent bb8c2a76ca
commit 5ae2d9c259
5 changed files with 73 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
src/hyperv/hyperv_driver.c
View File

@ -301,12 +301,12 @@ hypervNodeGetInfo(virConnectPtr conn, virNodeInfoPtr info)
}
/* Get Win32_Processor list */
virBufferAsprintf(&query,
"associators of "
"{Win32_ComputerSystem.Name=\"%s\"} "
"where AssocClass = Win32_ComputerSystemProcessor "
"ResultClass = Win32_Processor",
computerSystem->data.common->Name);
virBufferEscapeSQL(&query,
"associators of "
"{Win32_ComputerSystem.Name=\"%s\"} "
"where AssocClass = Win32_ComputerSystemProcessor "
"ResultClass = Win32_Processor",
computerSystem->data.common->Name);
if (hypervGetWin32ProcessorList(priv, &query, &processorList) < 0)
goto cleanup;
@ -493,7 +493,7 @@ hypervDomainLookupByUUID(virConnectPtr conn, const unsigned char *uuid)
virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
virBufferAddLit(&query, "where ");
virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
virBufferAsprintf(&query, "and Name = \"%s\"", uuid_string);
virBufferEscapeSQL(&query, "and Name = \"%s\"", uuid_string);
if (hypervGetMsvmComputerSystemList(priv, &query, &computerSystem) < 0)
goto cleanup;
@ -525,7 +525,7 @@ hypervDomainLookupByName(virConnectPtr conn, const char *name)
virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
virBufferAddLit(&query, "where ");
virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
virBufferAsprintf(&query, "and ElementName = \"%s\"", name);
virBufferEscapeSQL(&query, "and ElementName = \"%s\"", name);
if (hypervGetMsvmComputerSystemList(priv, &query, &computerSystem) < 0)
goto cleanup;
@ -673,13 +673,13 @@ hypervDomainGetInfo(virDomainPtr domain, virDomainInfoPtr info)
goto cleanup;
/* Get Msvm_VirtualSystemSettingData */
virBufferAsprintf(&query,
"associators of "
"{Msvm_ComputerSystem.CreationClassName=\"Msvm_ComputerSystem\","
"Name=\"%s\"} "
"where AssocClass = Msvm_SettingsDefineState "
"ResultClass = Msvm_VirtualSystemSettingData",
uuid_string);
virBufferEscapeSQL(&query,
"associators of "
"{Msvm_ComputerSystem.CreationClassName=\"Msvm_ComputerSystem\","
"Name=\"%s\"} "
"where AssocClass = Msvm_SettingsDefineState "
"ResultClass = Msvm_VirtualSystemSettingData",
uuid_string);
if (hypervGetMsvmVirtualSystemSettingDataList(priv, &query,
&virtualSystemSettingData) < 0) {
@ -695,12 +695,12 @@ hypervDomainGetInfo(virDomainPtr domain, virDomainInfoPtr info)
}
/* Get Msvm_ProcessorSettingData */
virBufferAsprintf(&query,
"associators of "
"{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
"where AssocClass = Msvm_VirtualSystemSettingDataComponent "
"ResultClass = Msvm_ProcessorSettingData",
virtualSystemSettingData->data.common->InstanceID);
virBufferEscapeSQL(&query,
"associators of "
"{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
"where AssocClass = Msvm_VirtualSystemSettingDataComponent "
"ResultClass = Msvm_ProcessorSettingData",
virtualSystemSettingData->data.common->InstanceID);
if (hypervGetMsvmProcessorSettingDataList(priv, &query,
&processorSettingData) < 0) {
@ -716,12 +716,12 @@ hypervDomainGetInfo(virDomainPtr domain, virDomainInfoPtr info)
}
/* Get Msvm_MemorySettingData */
virBufferAsprintf(&query,
"associators of "
"{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
"where AssocClass = Msvm_VirtualSystemSettingDataComponent "
"ResultClass = Msvm_MemorySettingData",
virtualSystemSettingData->data.common->InstanceID);
virBufferEscapeSQL(&query,
"associators of "
"{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
"where AssocClass = Msvm_VirtualSystemSettingDataComponent "
"ResultClass = Msvm_MemorySettingData",
virtualSystemSettingData->data.common->InstanceID);
if (hypervGetMsvmMemorySettingDataList(priv, &query,
&memorySettingData) < 0) {
@ -810,13 +810,13 @@ hypervDomainGetXMLDesc(virDomainPtr domain, unsigned int flags)
goto cleanup;
/* Get Msvm_VirtualSystemSettingData */
virBufferAsprintf(&query,
"associators of "
"{Msvm_ComputerSystem.CreationClassName=\"Msvm_ComputerSystem\","
"Name=\"%s\"} "
"where AssocClass = Msvm_SettingsDefineState "
"ResultClass = Msvm_VirtualSystemSettingData",
uuid_string);
virBufferEscapeSQL(&query,
"associators of "
"{Msvm_ComputerSystem.CreationClassName=\"Msvm_ComputerSystem\","
"Name=\"%s\"} "
"where AssocClass = Msvm_SettingsDefineState "
"ResultClass = Msvm_VirtualSystemSettingData",
uuid_string);
if (hypervGetMsvmVirtualSystemSettingDataList(priv, &query,
&virtualSystemSettingData) < 0) {
@ -832,12 +832,12 @@ hypervDomainGetXMLDesc(virDomainPtr domain, unsigned int flags)
}
/* Get Msvm_ProcessorSettingData */
virBufferAsprintf(&query,
"associators of "
"{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
"where AssocClass = Msvm_VirtualSystemSettingDataComponent "
"ResultClass = Msvm_ProcessorSettingData",
virtualSystemSettingData->data.common->InstanceID);
virBufferEscapeSQL(&query,
"associators of "
"{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
"where AssocClass = Msvm_VirtualSystemSettingDataComponent "
"ResultClass = Msvm_ProcessorSettingData",
virtualSystemSettingData->data.common->InstanceID);
if (hypervGetMsvmProcessorSettingDataList(priv, &query,
&processorSettingData) < 0) {
@ -853,12 +853,12 @@ hypervDomainGetXMLDesc(virDomainPtr domain, unsigned int flags)
}
/* Get Msvm_MemorySettingData */
virBufferAsprintf(&query,
"associators of "
"{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
"where AssocClass = Msvm_VirtualSystemSettingDataComponent "
"ResultClass = Msvm_MemorySettingData",
virtualSystemSettingData->data.common->InstanceID);
virBufferEscapeSQL(&query,
"associators of "
"{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
"where AssocClass = Msvm_VirtualSystemSettingDataComponent "
"ResultClass = Msvm_MemorySettingData",
virtualSystemSettingData->data.common->InstanceID);
if (hypervGetMsvmMemorySettingDataList(priv, &query,
&memorySettingData) < 0) {
@ -1397,7 +1397,7 @@ hypervDomainSendKey(virDomainPtr domain, unsigned int codeset,
if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
goto cleanup;
virBufferAsprintf(&query,
virBufferEscapeSQL(&query,
"associators of "
"{Msvm_ComputerSystem.CreationClassName=\"Msvm_ComputerSystem\","
"Name=\"%s\"} "
@ -1534,7 +1534,7 @@ hypervDomainSetMemoryFlags(virDomainPtr domain, unsigned long memory,
}
virBufferAddLit(&eprQuery, MSVM_COMPUTERSYSTEM_WQL_SELECT);
virBufferAsprintf(&eprQuery, "where Name = \"%s\"", uuid_string);
virBufferEscapeSQL(&eprQuery, "where Name = \"%s\"", uuid_string);
if (hypervAddEprParam(params, "ComputerSystem", priv, &eprQuery,
Msvm_ComputerSystem_WmiInfo) < 0)

2
src/hyperv/hyperv_wmi.c
View File

@ -895,7 +895,7 @@ hypervInvokeMethod(hypervPrivate *priv, hypervInvokeParamsListPtr params,
*/
while (!completed && timeout >= 0) {
virBufferAddLit(&query, MSVM_CONCRETEJOB_WQL_SELECT);
virBufferAsprintf(&query, "where InstanceID = \"%s\"", instanceID);
virBufferEscapeSQL(&query, "where InstanceID = \"%s\"", instanceID);
if (hypervGetMsvmConcreteJobList(priv, &query, &job) < 0
|| job == NULL)

1
src/libvirt_private.syms
View File

@ -1384,6 +1384,7 @@ virBufferEscapeN;
virBufferEscapeRegex;
virBufferEscapeSexpr;
virBufferEscapeShell;
virBufferEscapeSQL;
virBufferEscapeString;
virBufferFreeAndReset;
virBufferGetIndent;

20
src/util/virbuffer.c
View File

@ -574,6 +574,26 @@ virBufferEscapeRegex(virBufferPtr buf,
virBufferEscape(buf, '\\', "^$.|?*+()[]{}\\", format, str);
}
/**
* virBufferEscapeSQL:
* @buf: the buffer to append to
* @format: a printf like format string but with only one %s parameter
* @str: the string argument which needs to be escaped
*
* Do a formatted print with a single string to a buffer. The @str is
* escaped to prevent SQL injection (format is expected to contain \"%s\").
* Auto indentation may be applied.
*/
void
virBufferEscapeSQL(virBufferPtr buf,
const char *format,
const char *str)
{
virBufferEscape(buf, '\\', "'\"\\", format, str);
}
/**
* virBufferEscape:
* @buf: the buffer to append to

3
src/util/virbuffer.h
View File

@ -93,6 +93,9 @@ void virBufferEscapeSexpr(virBufferPtr buf, const char *format,
void virBufferEscapeRegex(virBufferPtr buf,
const char *format,
const char *str);
void virBufferEscapeSQL(virBufferPtr buf,
const char *format,
const char *str);
void virBufferEscapeShell(virBufferPtr buf, const char *str);
void virBufferURIEncodeString(virBufferPtr buf, const char *str);