diff options
author | Damien Miller <djm@mindrot.org> | 2000-12-03 11:51:51 +1100 |
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committer | Damien Miller <djm@mindrot.org> | 2000-12-03 11:51:51 +1100 |
commit | b84815880e453346667d6d2b3f02904674848a7a (patch) | |
tree | 03b0870fc18ac4977e1bbf4b0db0e5e79bdcea8b /auth2-pam.c | |
parent | c72745afa96a87d41a22804f48499db12d95dfcd (diff) | |
download | openssh-git-b84815880e453346667d6d2b3f02904674848a7a.tar.gz |
- (djm) Added patch from Nalin Dahyabhai <nalin@redhat.com> to enable
PAM authentication using KbdInteractive.
- (djm) Added another TODO
Diffstat (limited to 'auth2-pam.c')
-rw-r--r-- | auth2-pam.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/auth2-pam.c b/auth2-pam.c new file mode 100644 index 00000000..8ffbc244 --- /dev/null +++ b/auth2-pam.c @@ -0,0 +1,170 @@ +#include "includes.h" +RCSID("$Id: auth2-pam.c,v 1.1 2000/12/03 00:51:51 djm Exp $"); + +#ifdef USE_PAM +#include "ssh.h" +#include "ssh2.h" +#include "auth.h" +#include "packet.h" +#include "xmalloc.h" +#include "dispatch.h" +#include <security/pam_appl.h> + +struct { + int finished, num_received, num_expected; + int *prompts; + struct pam_response *responses; +} context_pam2 = {0, 0, 0, NULL}; + +static int do_conversation2(int num_msg, const struct pam_message **msg, + struct pam_response **resp, void *appdata_ptr); + +static struct pam_conv +conv2 = { + do_conversation2, + NULL, +}; + +void input_userauth_info_response_pam(int type, int plen, void *ctxt); + +int +auth2_pam(Authctxt *authctxt) +{ + int retval = -1; + char *method = "PAM"; + + if (authctxt->user == NULL) + fatal("auth2_pam: internal error: no user"); + + if (authctxt->valid) { + conv2.appdata_ptr = authctxt; + pam_set_conv(&conv2); + } + + dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, + &input_userauth_info_response_pam); + retval = (do_pam_authenticate(0) == PAM_SUCCESS); + dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL); + + userauth_log(authctxt, retval, method); + + return retval; +} + +static int +do_conversation2(int num_msg, const struct pam_message **msg, + struct pam_response **resp, void *appdata_ptr) +{ + int echo = 0, i = 0, j = 0, done = 0; + char *tmp = NULL, *text = NULL; + + context_pam2.finished = 0; + context_pam2.num_received = 0; + context_pam2.num_expected = 0; + context_pam2.prompts = xmalloc(sizeof(int) * num_msg); + context_pam2.responses = xmalloc(sizeof(struct pam_response) * num_msg); + memset(context_pam2.responses, 0, sizeof(struct pam_response) * num_msg); + + packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST); + packet_put_cstring(""); /* Name */ + packet_put_cstring(""); /* Instructions */ + packet_put_cstring(""); /* Language */ + for (i = 0, j = 0; i < num_msg; i++) { + if(((*msg)[i].msg_style == PAM_PROMPT_ECHO_ON) || + ((*msg)[i].msg_style == PAM_PROMPT_ECHO_OFF) || + (i == num_msg - 1)) { + j++; + } + } + packet_put_int(j); /* Number of prompts. */ + context_pam2.num_expected = j; + for (i = 0, j = 0; i < num_msg; i++) { + switch((*msg)[i].msg_style) { + case PAM_PROMPT_ECHO_ON: + echo = 1; + break; + case PAM_PROMPT_ECHO_OFF: + echo = 0; + break; + default: + echo = 0; + break; + } + if(text) { + tmp = xmalloc(strlen(text) + strlen((*msg)[i].msg) + 2); + strcpy(tmp, text); + strcat(tmp, "\n"); + strcat(tmp, (*msg)[i].msg); + xfree(text); + text = tmp; + tmp = NULL; + } else { + text = xstrdup((*msg)[i].msg); + } + if(((*msg)[i].msg_style == PAM_PROMPT_ECHO_ON) || + ((*msg)[i].msg_style == PAM_PROMPT_ECHO_OFF) || + (i == num_msg - 1)) { + debug("sending prompt ssh-%d(pam-%d) = \"%s\"", + j, i, text); + context_pam2.prompts[j++] = i; + packet_put_cstring(text); + packet_put_char(echo); + xfree(text); + text = NULL; + } + } + packet_send(); + packet_write_wait(); + + /* Grabbing control of execution and spinning until we get what + * we want is probably rude, but it seems to work properly, and + * the client *should* be in lock-step with us, so the loop should + * only be traversed once. */ + while(context_pam2.finished == 0) { + done = 1; + dispatch_run(DISPATCH_BLOCK, &done, appdata_ptr); + if(context_pam2.finished == 0) { + debug("extra packet during conversation"); + } + } + + if(context_pam2.num_received == context_pam2.num_expected) { + *resp = context_pam2.responses; + return PAM_SUCCESS; + } else { + return PAM_CONV_ERR; + } +} + +void +input_userauth_info_response_pam(int type, int plen, void *ctxt) +{ + Authctxt *authctxt = ctxt; + unsigned int nresp = 0, rlen = 0, i = 0; + char *resp; + + if (authctxt == NULL) + fatal("input_userauth_info_response_pam: no authentication context"); + + if (authctxt->attempt++ >= AUTH_FAIL_MAX) + packet_disconnect("too many failed userauth_requests"); + + nresp = packet_get_int(); /* Number of responses. */ + debug("got %d responses", nresp); + + for (i = 0; i < nresp; i++) { + int j = context_pam2.prompts[i]; + resp = packet_get_string(&rlen); + debug("response ssh-%d(pam-%d) = \"%s\"", i, j, resp); + context_pam2.responses[j].resp_retcode = PAM_SUCCESS; + context_pam2.responses[j].resp = xstrdup(resp); + xfree(resp); + context_pam2.num_received++; + } + + context_pam2.finished = 1; + + packet_done(); +} + +#endif |