External/libvirt
1
0
Fork 0
mirror of https://gitlab.com/libvirt/libvirt.git synced 2024-12-23 06:05:27 +00:00
Code Issues Packages Projects Releases Wiki Activity

qemu: pass sensitive data to nbdkit via pipe

Browse Source 
Rather than passing passwords and cookies (which could contain
passwords) to nbdkit via commandline arguments, use the alternate format
that nbdkit supports where we can specify a file descriptor which nbdkit
will read to get the password or cookies.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Jonathon Jongsma 2022-08-18 16:27:46 -05:00
parent 545e16fab5
commit 4f136a5f35
1 changed files with 34 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
src/qemu/qemu_nbdkit.c
View File

@ -24,7 +24,6 @@
#include "virerror.h"
#include "virlog.h"
#include "virpidfile.h"
#include "virsecureerase.h"
#include "virtime.h"
#include "virutil.h"
#include "qemu_block.h"
@ -753,6 +752,29 @@ qemuNbdkitInitStorageSource(qemuNbdkitCaps *caps,
}
static int
qemuNbdkitCommandPassDataByPipe(virCommand *cmd,
const char *argName,
unsigned char **buf,
size_t buflen)
{
g_autofree char *fdfmt = NULL;
int fd = virCommandSetSendBuffer(cmd, buf, buflen);
if (fd < 0)
return -1;
/* some nbdkit arguments accept a variation where nbdkit will read the data
* from a file descriptor, e.g. password=-FD */
fdfmt = g_strdup_printf("-%i", fd);
virCommandAddArgPair(cmd, argName, fdfmt);
virCommandDoAsyncIO(cmd);
return 0;
}
static int
qemuNbdkitProcessBuildCommandCurl(qemuNbdkitProcess *proc,
virCommand *cmd)
@ -775,7 +797,6 @@ qemuNbdkitProcessBuildCommandCurl(qemuNbdkitProcess *proc,
g_autoptr(virConnect) conn = virGetConnectSecret();
g_autofree uint8_t *secret = NULL;
size_t secretlen = 0;
g_autofree char *password = NULL;
int secrettype;
virStorageAuthDef *authdef = proc->source->auth;
@ -799,25 +820,18 @@ qemuNbdkitProcessBuildCommandCurl(qemuNbdkitProcess *proc,
return -1;
}
/* ensure that the secret is a NULL-terminated string */
password = g_strndup((char*)secret, secretlen);
virSecureErase(secret, secretlen);
/* for now, just report an error rather than passing the password in
* cleartext on the commandline */
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Password not yet supported for nbdkit sources"));
virSecureEraseString(password);
if (qemuNbdkitCommandPassDataByPipe(cmd, "password",
&secret, secretlen) < 0)
return -1;
}
if (proc->source->ncookies > 0) {
/* for now, just report an error rather than passing cookies in
* cleartext on the commandline */
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Cookies not yet supported for nbdkit sources"));
/* Create a pipe to send the cookies to the nbdkit process. */
if (proc->source->ncookies) {
g_autofree char *cookies = qemuBlockStorageSourceGetCookieString(proc->source);
if (qemuNbdkitCommandPassDataByPipe(cmd, "cookie",
(unsigned char**)&cookies,
strlen(cookies)) < 0)
return -1;
}