diff options
Diffstat (limited to 'auth-pam.c')
-rw-r--r-- | auth-pam.c | 216 |
1 files changed, 110 insertions, 106 deletions
@@ -28,31 +28,29 @@ #include "ssh.h" #include "xmalloc.h" #include "log.h" +#include "auth-pam.h" #include "servconf.h" #include "canohost.h" #include "readpass.h" -RCSID("$Id: auth-pam.c,v 1.24 2001/02/05 12:42:17 stevesk Exp $"); +RCSID("$Id: auth-pam.c,v 1.25 2001/02/07 01:58:34 djm Exp $"); #define NEW_AUTHTOK_MSG \ "Warning: Your password has expired, please change it now" -/* Callbacks */ -static int pamconv(int num_msg, const struct pam_message **msg, - struct pam_response **resp, void *appdata_ptr); -void pam_cleanup_proc(void *context); -void pam_msg_cat(const char *msg); +static int do_pam_conversation(int num_msg, const struct pam_message **msg, + struct pam_response **resp, void *appdata_ptr); /* module-local variables */ static struct pam_conv conv = { - pamconv, + do_pam_conversation, NULL }; +static char *pam_msg = NULL; static pam_handle_t *pamh = NULL; static const char *pampasswd = NULL; -static char *pam_msg = NULL; -/* states for pamconv() */ +/* states for do_pam_conversation() */ enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN; /* remember whether pam_acct_mgmt() returned PAM_NEWAUTHTOK_REQD */ static int password_change_required = 0; @@ -80,14 +78,14 @@ int do_pam_authenticate(int flags) * * INITIAL_LOGIN mode simply feeds the password from the client into * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output - * messages with pam_msg_cat(). This is used during initial + * messages with into pam_msg. This is used during initial * authentication to bypass the normal PAM password prompt. * * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase(prompt, 1) * and outputs messages to stderr. This mode is used if pam_chauthtok() * is called to update expired passwords. */ -static int pamconv(int num_msg, const struct pam_message **msg, +static int do_pam_conversation(int num_msg, const struct pam_message **msg, struct pam_response **resp, void *appdata_ptr) { struct pam_response *reply; @@ -100,40 +98,28 @@ static int pamconv(int num_msg, const struct pam_message **msg, return PAM_CONV_ERR; for (count = 0; count < num_msg; count++) { - switch(PAM_MSG_MEMBER(msg, count, msg_style)) { + if (pamstate == INITIAL_LOGIN) { + /* + * We can't use stdio yet, queue messages for + * printing later + */ + switch(PAM_MSG_MEMBER(msg, count, msg_style)) { case PAM_PROMPT_ECHO_ON: - if (pamstate == INITIAL_LOGIN) { + free(reply); + return PAM_CONV_ERR; + case PAM_PROMPT_ECHO_OFF: + if (pampasswd == NULL) { free(reply); return PAM_CONV_ERR; - } else { - fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); - fgets(buf, sizeof(buf), stdin); - reply[count].resp = xstrdup(buf); - reply[count].resp_retcode = PAM_SUCCESS; - break; - } - case PAM_PROMPT_ECHO_OFF: - if (pamstate == INITIAL_LOGIN) { - if (pampasswd == NULL) { - free(reply); - return PAM_CONV_ERR; - } - reply[count].resp = xstrdup(pampasswd); - } else { - reply[count].resp = - xstrdup(read_passphrase(PAM_MSG_MEMBER(msg, count, msg), 1)); } + reply[count].resp = xstrdup(pampasswd); reply[count].resp_retcode = PAM_SUCCESS; break; case PAM_ERROR_MSG: case PAM_TEXT_INFO: if ((*msg)[count].msg != NULL) { - if (pamstate == INITIAL_LOGIN) - pam_msg_cat(PAM_MSG_MEMBER(msg, count, msg)); - else { - fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); - fputs("\n", stderr); - } + message_cat(&pam_msg, + PAM_MSG_MEMBER(msg, count, msg)); } reply[count].resp = xstrdup(""); reply[count].resp_retcode = PAM_SUCCESS; @@ -141,6 +127,36 @@ static int pamconv(int num_msg, const struct pam_message **msg, default: free(reply); return PAM_CONV_ERR; + } + } else { + /* + * stdio is connected, so interact directly + */ + switch(PAM_MSG_MEMBER(msg, count, msg_style)) { + case PAM_PROMPT_ECHO_ON: + fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); + fgets(buf, sizeof(buf), stdin); + reply[count].resp = xstrdup(buf); + reply[count].resp_retcode = PAM_SUCCESS; + break; + case PAM_PROMPT_ECHO_OFF: + reply[count].resp = xstrdup( + read_passphrase(PAM_MSG_MEMBER(msg, count, + msg), 1)); + reply[count].resp_retcode = PAM_SUCCESS; + break; + case PAM_ERROR_MSG: + case PAM_TEXT_INFO: + if ((*msg)[count].msg != NULL) + fprintf(stderr, "%s\n", + PAM_MSG_MEMBER(msg, count, msg)); + reply[count].resp = xstrdup(""); + reply[count].resp_retcode = PAM_SUCCESS; + break; + default: + free(reply); + return PAM_CONV_ERR; + } } } @@ -154,25 +170,21 @@ void pam_cleanup_proc(void *context) { int pam_retval; - if (pamh != NULL) - { + if (pamh) { pam_retval = pam_close_session(pamh, 0); - if (pam_retval != PAM_SUCCESS) { + if (pam_retval != PAM_SUCCESS) log("Cannot close PAM session[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + pam_retval, PAM_STRERROR(pamh, pam_retval)); pam_retval = pam_setcred(pamh, PAM_DELETE_CRED); - if (pam_retval != PAM_SUCCESS) { - debug("Cannot delete credentials[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + if (pam_retval != PAM_SUCCESS) + debug("Cannot delete credentials[%d]: %.200s", + pam_retval, PAM_STRERROR(pamh, pam_retval)); pam_retval = pam_end(pamh, pam_retval); - if (pam_retval != PAM_SUCCESS) { + if (pam_retval != PAM_SUCCESS) log("Cannot release PAM authentication[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + pam_retval, PAM_STRERROR(pamh, pam_retval)); } } @@ -197,12 +209,13 @@ int auth_pam_password(struct passwd *pw, const char *password) pamstate = INITIAL_LOGIN; pam_retval = do_pam_authenticate(0); if (pam_retval == PAM_SUCCESS) { - debug("PAM Password authentication accepted for user \"%.100s\"", - pw->pw_name); + debug("PAM Password authentication accepted for " + "user \"%.100s\"", pw->pw_name); return 1; } else { - debug("PAM Password authentication for \"%.100s\" failed[%d]: %s", - pw->pw_name, pam_retval, PAM_STRERROR(pamh, pam_retval)); + debug("PAM Password authentication for \"%.100s\" " + "failed[%d]: %s", pw->pw_name, pam_retval, + PAM_STRERROR(pamh, pam_retval)); return 0; } } @@ -213,22 +226,21 @@ int do_pam_account(char *username, char *remote_user) int pam_retval; extern ServerOptions options; + pam_set_conv(&conv); + debug("PAM setting rhost to \"%.200s\"", get_canonical_hostname(options.reverse_mapping_check)); pam_retval = pam_set_item(pamh, PAM_RHOST, get_canonical_hostname(options.reverse_mapping_check)); - if (pam_retval != PAM_SUCCESS) { - fatal("PAM set rhost failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } - - if (remote_user != NULL) { + if (pam_retval != PAM_SUCCESS) + fatal("PAM set rhost failed[%d]: %.200s", pam_retval, + PAM_STRERROR(pamh, pam_retval)); + if (remote_user) { debug("PAM setting ruser to \"%.200s\"", remote_user); pam_retval = pam_set_item(pamh, PAM_RUSER, remote_user); - if (pam_retval != PAM_SUCCESS) { - fatal("PAM set ruser failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + if (pam_retval != PAM_SUCCESS) + fatal("PAM set ruser failed[%d]: %.200s", pam_retval, + PAM_STRERROR(pamh, pam_retval)); } pam_retval = pam_acct_mgmt(pamh, 0); @@ -237,13 +249,14 @@ int do_pam_account(char *username, char *remote_user) /* This is what we want */ break; case PAM_NEW_AUTHTOK_REQD: - pam_msg_cat(NEW_AUTHTOK_MSG); + message_cat(&pam_msg, NEW_AUTHTOK_MSG); /* flag that password change is necessary */ password_change_required = 1; break; default: - log("PAM rejected by account configuration[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); + log("PAM rejected by account configuration[%d]: " + "%.200s", pam_retval, PAM_STRERROR(pamh, + pam_retval)); return(0); } @@ -258,17 +271,15 @@ void do_pam_session(char *username, const char *ttyname) if (ttyname != NULL) { debug("PAM setting tty to \"%.200s\"", ttyname); pam_retval = pam_set_item(pamh, PAM_TTY, ttyname); - if (pam_retval != PAM_SUCCESS) { + if (pam_retval != PAM_SUCCESS) fatal("PAM set tty failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + pam_retval, PAM_STRERROR(pamh, pam_retval)); } pam_retval = pam_open_session(pamh, 0); - if (pam_retval != PAM_SUCCESS) { + if (pam_retval != PAM_SUCCESS) fatal("PAM session setup failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + pam_retval, PAM_STRERROR(pamh, pam_retval)); } /* Set PAM credentials */ @@ -279,13 +290,12 @@ void do_pam_setcred(void) debug("PAM establishing creds"); pam_retval = pam_setcred(pamh, PAM_ESTABLISH_CRED); if (pam_retval != PAM_SUCCESS) { - if(was_authenticated) { + if (was_authenticated) fatal("PAM setcred failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } else { + pam_retval, PAM_STRERROR(pamh, pam_retval)); + else debug("PAM setcred failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + pam_retval, PAM_STRERROR(pamh, pam_retval)); } } @@ -307,15 +317,13 @@ void do_pam_chauthtok(void) if (password_change_required) { pamstate = OTHER; - /* - * XXX: should we really loop forever? - */ + /* XXX: should we really loop forever? */ do { - pam_retval = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); - if (pam_retval != PAM_SUCCESS) { + pam_retval = pam_chauthtok(pamh, + PAM_CHANGE_EXPIRED_AUTHTOK); + if (pam_retval != PAM_SUCCESS) log("PAM pam_chauthtok failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + pam_retval, PAM_STRERROR(pamh, pam_retval)); } while (pam_retval != PAM_SUCCESS); } } @@ -336,11 +344,9 @@ void start_pam(const char *user) pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &pamh); - if (pam_retval != PAM_SUCCESS) { + if (pam_retval != PAM_SUCCESS) fatal("PAM initialisation failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } - + pam_retval, PAM_STRERROR(pamh, pam_retval)); #ifdef PAM_TTY_KLUDGE /* * Some PAM modules (e.g. pam_time) require a TTY to operate, @@ -350,10 +356,9 @@ void start_pam(const char *user) * Kludge: Set a fake PAM_TTY */ pam_retval = pam_set_item(pamh, PAM_TTY, "ssh"); - if (pam_retval != PAM_SUCCESS) { + if (pam_retval != PAM_SUCCESS) fatal("PAM set tty failed[%d]: %.200s", - pam_retval, PAM_STRERROR(pamh, pam_retval)); - } + pam_retval, PAM_STRERROR(pamh, pam_retval)); #endif /* PAM_TTY_KLUDGE */ fatal_add_cleanup(&pam_cleanup_proc, NULL); @@ -377,26 +382,25 @@ void print_pam_messages(void) fputs(pam_msg, stderr); } -/* Append a message to the PAM message buffer */ -void pam_msg_cat(const char *msg) +/* Append a message to buffer */ +void message_cat(char **p, const char *a) { - char *p; - size_t new_msg_len; - size_t pam_msg_len; + char *cp; + size_t new_len; - new_msg_len = strlen(msg); + new_len = strlen(a); - if (pam_msg) { - pam_msg_len = strlen(pam_msg); - pam_msg = xrealloc(pam_msg, new_msg_len + pam_msg_len + 2); - p = pam_msg + pam_msg_len; - } else { - pam_msg = p = xmalloc(new_msg_len + 2); - } + if (*p) { + size_t len = strlen(*p); + + *p = xrealloc(*p, new_len + len + 2); + cp = *p + len; + } else + *p = cp = xmalloc(new_len + 2); - memcpy(p, msg, new_msg_len); - p[new_msg_len] = '\n'; - p[new_msg_len + 1] = '\0'; + memcpy(cp, a, new_len); + cp[new_len] = '\n'; + cp[new_len + 1] = '\0'; } #endif /* USE_PAM */ |