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openssh-portable/ssh-add.c

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/*
ssh-add.c
Author: Tatu Ylonen <ylo@cs.hut.fi>
Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
All rights reserved
Created: Thu Apr 6 00:52:24 1995 ylo
Adds an identity to the authentication server, or removes an identity.
*/
#include "includes.h"
RCSID("$Id: ssh-add.c,v 1.6 1999/11/12 04:46:08 damien Exp $");
#include "rsa.h"
#include "ssh.h"
#include "xmalloc.h"
#include "authfd.h"
void
delete_file(AuthenticationConnection *ac, const char *filename)
{
RSA *key;
char *comment;
key = RSA_new();
if (!load_public_key(filename, key, &comment))
{
printf("Bad key file %s: %s\n", filename, strerror(errno));
return;
}
if (ssh_remove_identity(ac, key))
fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
else
fprintf(stderr, "Could not remove identity: %s\n", filename);
RSA_free(key);
xfree(comment);
}
void
delete_all(AuthenticationConnection *ac)
{
/* Send a request to remove all identities. */
if (ssh_remove_all_identities(ac))
fprintf(stderr, "All identities removed.\n");
else
fprintf(stderr, "Failed to remove all identitities.\n");
}
#define BUFSIZE 1024
void
add_file(AuthenticationConnection *ac, const char *filename)
{
RSA *key;
RSA *public_key;
char *saved_comment, *comment, *pass;
int first;
#ifndef DISABLE_EXTERNAL_ASKPASS
int pipes[2];
char buf[BUFSIZE];
int tmp;
pid_t child;
FILE *pipef;
#endif /* !DISABLE_EXTERNAL_ASKPASS */
key = RSA_new();
public_key = RSA_new();
if (!load_public_key(filename, public_key, &saved_comment))
{
printf("Bad key file %s: %s\n", filename, strerror(errno));
return;
}
RSA_free(public_key);
pass = xstrdup("");
first = 1;
while (!load_private_key(filename, pass, key, &comment))
{
/* Free the old passphrase. */
memset(pass, 0, strlen(pass));
xfree(pass);
/* Ask for a passphrase. */
if (getenv("DISPLAY") && !isatty(fileno(stdin)))
{
#ifndef DISABLE_EXTERNAL_ASKPASS
if (pipe(pipes) ==-1)
{
fprintf(stderr, "Creating pipes failed: %s\n", strerror(errno));
exit(1);
}
if (fflush(NULL)==EOF)
{
fprintf(stderr, "Cannot flush buffers: %s\n", strerror(errno));
exit(1);
}
switch (child=fork())
{
case -1:
fprintf(stderr, "Cannot fork: %s\n", strerror(errno));
exit(1);
case 0:
close(pipes[0]);
if (dup2(pipes[1], 1) ==-1)
{
fprintf(stderr, "dup2 failed: %s\n", strerror(errno));
exit(1);
}
tmp=snprintf(buf, BUFSIZE, "Need passphrase for %s (%s)",
filename, saved_comment);
/* skip the prompt if it won't fit */
if (tmp < 0 || tmp >= BUFSIZE)
tmp=execlp(ASKPASS_PROGRAM, "ssh-askpass", 0);
else
tmp=execlp(ASKPASS_PROGRAM, "ssh-askpass", buf, 0);
if (tmp==-1)
{
fprintf(stderr, "Executing ssh-askpass failed: %s\n",
strerror(errno));
exit(1);
}
break;
default:
close(pipes[1]);
if ( (pipef=fdopen(pipes[0], "r")) ==NULL)
{
fprintf(stderr, "fdopen failed: %s\n", strerror(errno));
exit(1);
}
if(fgets(buf, sizeof(buf), pipef)==NULL)
{
xfree(saved_comment);
return;
}
fclose(pipef);
if (strchr(buf, '\n'))
*strchr(buf, '\n') = 0;
pass = xstrdup(buf);
memset(buf, 0, sizeof(buf));
if (waitpid(child, NULL, 0) ==-1)
{
fprintf(stderr, "Waiting for child failed: %s\n",
strerror(errno));
exit(1);
}
if (strcmp(pass, "") == 0)
{
xfree(saved_comment);
xfree(pass);
return;
}
}
#else /* !DISABLE_EXTERNAL_ASKPASS */
xfree(saved_comment);
return;
#endif /* !DISABLE_EXTERNAL_ASKPASS */
}
else
{
if (first)
printf("Need passphrase for %s (%s).\n", filename, saved_comment);
else
printf("Bad passphrase.\n");
pass = read_passphrase("Enter passphrase: ", 1);
if (strcmp(pass, "") == 0)
{
xfree(saved_comment);
xfree(pass);
return;
}
}
first = 0;
}
memset(pass, 0, strlen(pass));
xfree(pass);
xfree(saved_comment);
if (ssh_add_identity(ac, key, comment))
fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
else
fprintf(stderr, "Could not add identity: %s\n", filename);
RSA_free(key);
xfree(comment);
}
void
list_identities(AuthenticationConnection *ac)
{
BIGNUM *e, *n;
int bits, status;
char *comment;
int had_identities;
e = BN_new();
n = BN_new();
had_identities = 0;
for (status = ssh_get_first_identity(ac, &bits, e, n, &comment);
status;
status = ssh_get_next_identity(ac, &bits, e, n, &comment))
{
char *buf;
had_identities = 1;
printf("%d ", bits);
buf = BN_bn2dec(e);
if (buf != NULL) {
printf("%s ", buf);
free (buf);
} else {
error("list_identities: BN_bn2dec #1 failed.");
}
buf = BN_bn2dec(n);
if (buf != NULL) {
printf("%s %s\n", buf, comment);
free (buf);
} else {
error("list_identities: BN_bn2dec #2 failed.");
}
xfree(comment);
}
BN_clear_free(e);
BN_clear_free(n);
if (!had_identities)
printf("The agent has no identities.\n");
}
int
main(int argc, char **argv)
{
AuthenticationConnection *ac = NULL;
struct passwd *pw;
char buf[1024];
int no_files = 1;
int i;
int deleting = 0;
/* check if RSA support exists */
if (rsa_alive() == 0) {
extern char *__progname;
fprintf(stderr,
"%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
__progname);
exit(1);
}
/* At first, get a connection to the authentication agent. */
ac = ssh_get_authentication_connection();
if (ac == NULL) {
fprintf(stderr, "Could not open a connection to your authentication agent.\n");
exit(1);
}
for (i = 1; i < argc; i++)
{
if (strcmp(argv[i], "-l") == 0)
{
list_identities(ac);
no_files = 0; /* Don't default-add/delete if -l. */
continue;
}
if (strcmp(argv[i], "-d") == 0)
{
deleting = 1;
continue;
}
if (strcmp(argv[i], "-D") == 0)
{
delete_all(ac);
no_files = 0;
continue;
}
no_files = 0;
if (deleting)
delete_file(ac, argv[i]);
else
add_file(ac, argv[i]);
}
if (no_files)
{
pw = getpwuid(getuid());
if (!pw)
{
fprintf(stderr, "No user found with uid %d\n", (int)getuid());
ssh_close_authentication_connection(ac);
exit(1);
}
snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY);
if (deleting)
delete_file(ac, buf);
else
add_file(ac, buf);
}
ssh_close_authentication_connection(ac);
exit(0);
}
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