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Improve example/ssh2 to allow unmodified use of public key auth

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The previous hard-coded key file paths were not valid for normal users.
Make the paths relative to the user's home directory instead so they
can work out of the box.  Add a banner showing what connection will be
attempted to make it easier for the user to see what is being attempted.
Enable trace debugging since this is designed as a test program.
This commit is contained in:
Dan Fandrich
2022-12-08 18:06:46 -08:00
committed by Dan Fandrich
parent 2e2812dde8
commit d4062feb3d
1 changed files with 39 additions and 5 deletions
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44
example/ssh2.c
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@ -4,7 +4,10 @@
* The sample code has default values for host name, user name, password
* and path to copy, but you can specify them on the command line like:
*
* "ssh2 host user password [-p|-i|-k]"
* Usage: ssh2 hostip user password [-p|-i|-k]
* -p authenticate using password
* -i authenticate using keyboard-interactive
* -k authenticate using public key (password argument decrypts keyfile)
*/
#include "libssh2_config.h"
@ -30,15 +33,19 @@
#include <arpa/inet.h>
#endif
#include <stdlib.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#endif
const char *keyfile1 = "~/.ssh/id_rsa.pub";
const char *keyfile2 = "~/.ssh/id_rsa";
const char *keyfile1 = ".ssh/id_rsa.pub";
const char *keyfile2 = ".ssh/id_rsa";
const char *username = "username";
const char *password = "password";
@ -112,6 +119,10 @@ int main(int argc, char *argv[])
sin.sin_family = AF_INET;
sin.sin_port = htons(22);
sin.sin_addr.s_addr = hostaddr;
fprintf(stderr, "Connecting to %s as user %s\n",
inet_ntoa(sin.sin_addr), username);
if(connect(sock, (struct sockaddr*)(&sin),
sizeof(struct sockaddr_in)) != 0) {
fprintf(stderr, "failed to connect!\n");
@ -190,14 +201,37 @@ int main(int argc, char *argv[])
}
else if(auth_pw & 4) {
/* Or by public key */
if(libssh2_userauth_publickey_fromfile(session, username, keyfile1,
keyfile2, password)) {
size_t fn1sz, fn2sz;
char *fn1, *fn2;
char const *h = getenv("HOME");
if(!h || !*h)
h = ".";
fn1sz = strlen(h) + strlen(keyfile1) + 2;
fn2sz = strlen(h) + strlen(keyfile2) + 2;
fn1 = malloc(fn1sz);
fn2 = malloc(fn2sz);
if(!fn1 || !fn2) {
free(fn2);
free(fn1);
fprintf(stderr, "out of memory\n");
goto shutdown;
}
/* Using asprintf() here would be much cleaner, but less portable */
snprintf(fn1, fn1sz, "%s/%s", h, keyfile1);
snprintf(fn2, fn2sz, "%s/%s", h, keyfile2);
if(libssh2_userauth_publickey_fromfile(session, username, fn1,
fn2, password)) {
fprintf(stderr, "\tAuthentication by public key failed!\n");
free(fn2);
free(fn1);
goto shutdown;
}
else {
fprintf(stderr, "\tAuthentication by public key succeeded.\n");
}
free(fn2);
free(fn1);
}
else {
fprintf(stderr, "No supported authentication methods found!\n");