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openssh-portable
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- markus@cvs.openbsd.org 2001/04/18 21:57:42 

[readpass.c ssh-add.c]
     call askpass from ssh, too, based on work by roth@feep.net, ok deraadt
This commit is contained in:
Ben Lindstrom 2001-04-19 20:33:07 +00:00
parent f73e05eca8
commit 5eb97b6f3d
3 changed files with 81 additions and 65 deletions
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5
ChangeLog
View File

@ -3,6 +3,9 @@
- ian@cvs.openbsd.org 2001/04/18 16:21:05
[ssh-keyscan.1]
Fix typo reported in PR/1779
- markus@cvs.openbsd.org 2001/04/18 21:57:42
[readpass.c ssh-add.c]
call askpass from ssh, too, based on work by roth@feep.net, ok deraadt
20010418
- OpenBSD CVS Sync
@ -5165,4 +5168,4 @@
- Wrote replacements for strlcpy and mkdtemp
- Released 1.0pre1
$Id: ChangeLog,v 1.1140 2001/04/19 20:31:02 mouring Exp $
$Id: ChangeLog,v 1.1141 2001/04/19 20:33:07 mouring Exp $

71
readpass.c
View File

@ -32,11 +32,58 @@
*/
#include "includes.h"
RCSID("$OpenBSD: readpass.c,v 1.14 2001/02/08 19:30:52 itojun Exp $");
RCSID("$OpenBSD: readpass.c,v 1.15 2001/04/18 21:57:41 markus Exp $");
#include "xmalloc.h"
#include "cli.h"
#include "readpass.h"
#include "pathnames.h"
#include "log.h"
#include "atomicio.h"
#include "ssh.h"
char *
ssh_askpass(char *askpass, char *msg)
{
pid_t pid;
size_t len;
char *nl, *pass;
int p[2], status;
char buf[1024];
if (fflush(stdout) != 0)
error("ssh_askpass: fflush: %s", strerror(errno));
if (askpass == NULL)
fatal("internal error: askpass undefined");
if (pipe(p) < 0)
fatal("ssh_askpass: pipe: %s", strerror(errno));
if ((pid = fork()) < 0)
fatal("ssh_askpass: fork: %s", strerror(errno));
if (pid == 0) {
seteuid(getuid());
setuid(getuid());
close(p[0]);
if (dup2(p[1], STDOUT_FILENO) < 0)
fatal("ssh_askpass: dup2: %s", strerror(errno));
execlp(askpass, askpass, msg, (char *) 0);
fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
}
close(p[1]);
len = read(p[0], buf, sizeof buf);
close(p[0]);
while (waitpid(pid, &status, 0) < 0)
if (errno != EINTR)
break;
if (len <= 1)
return xstrdup("");
nl = strchr(buf, '\n');
if (nl)
*nl = '\0';
pass = xstrdup(buf);
memset(buf, 0, sizeof(buf));
return pass;
}
/*
* Reads a passphrase from /dev/tty with echo turned off. Returns the
@ -51,5 +98,27 @@ RCSID("$OpenBSD: readpass.c,v 1.14 2001/02/08 19:30:52 itojun Exp $");
char *
read_passphrase(const char *prompt, int from_stdin)
{
char *askpass = NULL;
int use_askpass = 0, ttyfd;
if (from_stdin) {
if (!isatty(STDIN_FILENO))
use_askpass = 1;
} else {
ttyfd = open("/dev/tty", O_RDWR);
if (ttyfd >= 0)
close(ttyfd);
else
use_askpass = 1;
}
if (use_askpass && getenv("DISPLAY")) {
if (getenv(SSH_ASKPASS_ENV))
askpass = getenv(SSH_ASKPASS_ENV);
else
askpass = _PATH_SSH_ASKPASS_DEFAULT;
return ssh_askpass(askpass, prompt);
}
return cli_read_passphrase(prompt, from_stdin, 0);
}

70
ssh-add.c
View File

@ -35,7 +35,7 @@
*/
#include "includes.h"
RCSID("$OpenBSD: ssh-add.c,v 1.35 2001/04/14 16:27:57 markus Exp $");
RCSID("$OpenBSD: ssh-add.c,v 1.36 2001/04/18 21:57:42 markus Exp $");
#include <openssl/evp.h>
@ -103,66 +103,18 @@ delete_all(AuthenticationConnection *ac)
fprintf(stderr, "Failed to remove all identities.\n");
}
char *
ssh_askpass(char *askpass, char *msg)
{
pid_t pid;
size_t len;
char *nl, *pass;
int p[2], status;
char buf[1024];
if (fflush(stdout) != 0)
error("ssh_askpass: fflush: %s", strerror(errno));
if (askpass == NULL)
fatal("internal error: askpass undefined");
if (pipe(p) < 0)
fatal("ssh_askpass: pipe: %s", strerror(errno));
if ((pid = fork()) < 0)
fatal("ssh_askpass: fork: %s", strerror(errno));
if (pid == 0) {
close(p[0]);
if (dup2(p[1], STDOUT_FILENO) < 0)
fatal("ssh_askpass: dup2: %s", strerror(errno));
execlp(askpass, askpass, msg, (char *) 0);
fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
}
close(p[1]);
len = read(p[0], buf, sizeof buf);
close(p[0]);
while (waitpid(pid, &status, 0) < 0)
if (errno != EINTR)
break;
if (len <= 1)
return xstrdup("");
nl = strchr(buf, '\n');
if (nl)
*nl = '\0';
pass = xstrdup(buf);
memset(buf, 0, sizeof(buf));
return pass;
}
void
add_file(AuthenticationConnection *ac, const char *filename)
{
struct stat st;
Key *private;
char *comment = NULL, *askpass = NULL;
char buf[1024], msg[1024];
int interactive = isatty(STDIN_FILENO);
char *comment = NULL;
char msg[1024];
if (stat(filename, &st) < 0) {
perror(filename);
exit(1);
}
if (!interactive && getenv("DISPLAY")) {
if (getenv(SSH_ASKPASS_ENV))
askpass = getenv(SSH_ASKPASS_ENV);
else
askpass = _PATH_SSH_ASKPASS_DEFAULT;
}
/* At first, try empty passphrase */
private = key_load_private(filename, "", &comment);
if (comment == NULL)
@ -174,18 +126,10 @@ add_file(AuthenticationConnection *ac, const char *filename)
/* clear passphrase since it did not work */
clear_pass();
printf("Need passphrase for %.200s\n", filename);
if (!interactive && askpass == NULL) {
xfree(comment);
return;
}
snprintf(msg, sizeof msg, "Enter passphrase for %.200s", comment);
snprintf(msg, sizeof msg, "Enter passphrase for %.200s ",
comment);
for (;;) {
if (interactive) {
snprintf(buf, sizeof buf, "%s: ", msg);
pass = read_passphrase(buf, 1);
} else {
pass = ssh_askpass(askpass, msg);
}
pass = read_passphrase(msg, 1);
if (strcmp(pass, "") == 0) {
clear_pass();
xfree(comment);
@ -195,7 +139,7 @@ add_file(AuthenticationConnection *ac, const char *filename)
if (private != NULL)
break;
clear_pass();
strlcpy(msg, "Bad passphrase, try again", sizeof msg);
strlcpy(msg, "Bad passphrase, try again ", sizeof msg);
}
}
if (ssh_add_identity(ac, private, comment))