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Filename :
pam_client.h
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/* * $Id$ * * Copyright (c) 1999 Andrew G. Morgan <morgan@linux.kernel.org> * * This header file provides the prototypes for the PAM client API */ #ifndef PAM_CLIENT_H #define PAM_CLIENT_H #ifdef __cplusplus extern "C" { #endif /* def __cplusplus */ #include <unistd.h> #include <string.h> #include <stdio.h> #include <sys/types.h> /* opaque agent handling structure */ typedef struct pamc_handle_s *pamc_handle_t; /* binary prompt structure pointer */ typedef struct { u_int32_t length; u_int8_t control; } *pamc_bp_t; /* * functions provided by libpamc */ /* * Initialize the agent abstraction library */ pamc_handle_t pamc_start(void); /* * Terminate the authentication process */ int pamc_end(pamc_handle_t *pch); /* * force the loading of a specified agent */ int pamc_load(pamc_handle_t pch, const char *agent_id); /* * Single conversation interface for binary prompts */ int pamc_converse(pamc_handle_t pch, pamc_bp_t *prompt_p); /* * disable an agent */ int pamc_disable(pamc_handle_t pch, const char *agent_id); /* * obtain a list of available agents */ char **pamc_list_agents(pamc_handle_t pch); /* * PAM_BP_ MACROS for creating, destroying and manipulating binary prompts */ #include <stdlib.h> #include <stdio.h> #include <unistd.h> #ifndef PAM_BP_ASSERT # ifdef NDEBUG # define PAM_BP_ASSERT(x) do {} while (0) # else # define PAM_BP_ASSERT(x) do { printf(__FILE__ "(%d): %s\n", \ __LINE__, x) ; exit(1); } while (0) # endif /* NDEBUG */ #endif /* PAM_BP_ASSERT */ #ifndef PAM_BP_CALLOC # define PAM_BP_CALLOC calloc #endif /* PAM_BP_CALLOC */ #ifndef PAM_BP_FREE # define PAM_BP_FREE free #endif /* PAM_BP_FREE */ #define __PAM_BP_WOCTET(x,y) (*((y) + (u_int8_t *)(x))) #define __PAM_BP_ROCTET(x,y) (*((y) + (const u_int8_t *)(x))) #define PAM_BP_MIN_SIZE (sizeof(u_int32_t) + sizeof(u_int8_t)) #define PAM_BP_MAX_LENGTH 0x20000 /* an advisory limit */ #define PAM_BP_WCONTROL(x) (__PAM_BP_WOCTET(x,4)) #define PAM_BP_RCONTROL(x) (__PAM_BP_ROCTET(x,4)) #define PAM_BP_SIZE(x) ((__PAM_BP_ROCTET(x,0)<<24)+ \ (__PAM_BP_ROCTET(x,1)<<16)+ \ (__PAM_BP_ROCTET(x,2)<< 8)+ \ (__PAM_BP_ROCTET(x,3) )) #define PAM_BP_LENGTH(x) (PAM_BP_SIZE(x) - PAM_BP_MIN_SIZE) #define PAM_BP_WDATA(x) (PAM_BP_MIN_SIZE + (u_int8_t *) (x)) #define PAM_BP_RDATA(x) (PAM_BP_MIN_SIZE + (const u_int8_t *) (x)) /* Note, this macro always '\0' terminates renewed packets */ #define PAM_BP_RENEW(old_p, cntrl, data_length) \ do { \ if (old_p) { \ if (*(old_p)) { \ u_int32_t __size; \ __size = PAM_BP_SIZE(*(old_p)); \ memset(*(old_p), 0, __size); \ PAM_BP_FREE(*(old_p)); \ } \ if (cntrl) { \ u_int32_t __size; \ \ __size = PAM_BP_MIN_SIZE + data_length; \ if ((*(old_p) = PAM_BP_CALLOC(1, 1+__size))) { \ __PAM_BP_WOCTET(*(old_p), 3) = __size & 0xFF; \ __PAM_BP_WOCTET(*(old_p), 2) = (__size>>=8) & 0xFF; \ __PAM_BP_WOCTET(*(old_p), 1) = (__size>>=8) & 0xFF; \ __PAM_BP_WOCTET(*(old_p), 0) = (__size>>=8) & 0xFF; \ (*(old_p))->control = cntrl; \ } else { \ PAM_BP_ASSERT("out of memory for binary prompt"); \ } \ } else { \ *old_p = NULL; \ } \ } else { \ PAM_BP_ASSERT("programming error, invalid binary prompt pointer"); \ } \ } while (0) #define PAM_BP_FILL(prmpt, offset, length, data) \ do { \ size_t bp_length; \ u_int8_t *prompt = (u_int8_t *) (prmpt); \ bp_length = PAM_BP_LENGTH(prompt); \ if (bp_length < ((length)+(offset))) { \ PAM_BP_ASSERT("attempt to write over end of prompt"); \ } \ memcpy((offset) + PAM_BP_WDATA(prompt), (data), (length)); \ } while (0) #define PAM_BP_EXTRACT(prmpt, offset, length, data) \ do { \ size_t __bp_length; \ const u_int8_t *__prompt = (const u_int8_t *) (prmpt); \ __bp_length = PAM_BP_LENGTH(__prompt); \ if (((offset) < 0) || (__bp_length < ((length)+(offset))) \ || ((length) < 0)) { \ PAM_BP_ASSERT("invalid extraction from prompt"); \ } \ memcpy((data), (offset) + PAM_BP_RDATA(__prompt), (length)); \ } while (0) /* Control types */ #define PAM_BPC_FALSE 0 #define PAM_BPC_TRUE 1 #define PAM_BPC_OK 0x01 /* continuation packet */ #define PAM_BPC_SELECT 0x02 /* initialization packet */ #define PAM_BPC_DONE 0x03 /* termination packet */ #define PAM_BPC_FAIL 0x04 /* unable to execute */ /* The following control characters are only legal for echanges between an agent and a client (it is the responsibility of the client to enforce this rule in the face of a rogue server): */ #define PAM_BPC_GETENV 0x41 /* obtain client env.var */ #define PAM_BPC_PUTENV 0x42 /* set client env.var */ #define PAM_BPC_TEXT 0x43 /* display message */ #define PAM_BPC_ERROR 0x44 /* display error message */ #define PAM_BPC_PROMPT 0x45 /* echo'd text prompt */ #define PAM_BPC_PASS 0x46 /* non-echo'd text prompt*/ /* quick check for prompts that are legal for the client (by implication the server too) to send to libpamc */ #define PAM_BPC_FOR_CLIENT(/* pamc_bp_t */ prompt) \ (((prompt)->control <= PAM_BPC_FAIL && (prompt)->control >= PAM_BPC_OK) \ ? PAM_BPC_TRUE:PAM_BPC_FALSE) #ifdef __cplusplus } #endif /* def __cplusplus */ #endif /* PAM_CLIENT_H */