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authorLoïc Collignon <loic.collignon@iot.bzh>2017-07-31 23:33:53 +0200
committerLoïc Collignon <loic.collignon@iot.bzh>2017-07-31 23:33:53 +0200
commite490f85b3ad29f3457d77cd3b2bdf31a76b22ac9 (patch)
tree17be5adc167c27e3f2ee837b968e88970263b6db /pam_agl/pam_agl.c
parente043fd27f0be97ce06a7eced3c2a9740fb9d0493 (diff)
authenticate keys against a json document.
Change-Id: I988ccef75bf3f1def40893aa506d169a3926e32a Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>
Diffstat (limited to 'pam_agl/pam_agl.c')
-rw-r--r--pam_agl/pam_agl.c166
1 files changed, 121 insertions, 45 deletions
diff --git a/pam_agl/pam_agl.c b/pam_agl/pam_agl.c
index 3e246e4..0eea11a 100644
--- a/pam_agl/pam_agl.c
+++ b/pam_agl/pam_agl.c
@@ -15,6 +15,8 @@
#include <security/pam_modules.h>
#include <security/pam_appl.h>
+#define DATABASE_FILE "/etc/agl/keys.json"
+
#define BLOCK_SIZE 4096
typedef struct header_
{
@@ -27,6 +29,37 @@ int is_valid_mn(const char* v)
return v && v[0] == 'I' && v[1] == 'D' && v[2] == 'K' && v[3] == 'Y';
}
+char* get_file_content(const char* path)
+{
+ char* buffer;
+ long length;
+ FILE* f;
+
+ buffer = NULL;
+ length = 0;
+
+ f = fopen(path, "rb");
+ if (f)
+ {
+ fseek(f, 0, SEEK_END);
+ length = ftell(f);
+ fseek(f, 0, SEEK_SET);
+ buffer = malloc(length + 1);
+ if (buffer)
+ {
+ if (fread (buffer, 1, length, f) != length)
+ {
+ free(buffer);
+ buffer = NULL;
+ }
+ else buffer[length] = 0;
+ }
+ fclose (f);
+ }
+
+ return buffer;
+}
+
void pam_putenv_ex(pam_handle_t* pamh, const char* name, const char* value)
{
char result[4096];
@@ -40,77 +73,120 @@ void pam_putenv_ex(pam_handle_t* pamh, const char* name, const char* value)
pam_putenv(pamh, result);
}
-int check_device(pam_handle_t* pamh, const char* device)
+int read_device(const char* device, char** idkey)
{
- printf("[PAM DEBUG]: check_device %s...\n", device);
- int fd = open(device, O_RDONLY);
+ int fd;
+ ssize_t sz;
+ header h;
+
+ printf("[PAM DEBUG] check_device %s...\n", device);
+ fd = open(device, O_RDONLY);
if (fd == -1)
{
- printf("[PAM DEBUG]: Failed to open the device %s!\n", device);
+ printf("[PAM DEBUG] Failed to open the device %s!\n", device);
return PAM_SERVICE_ERR;
}
- header h;
- ssize_t sz = read(fd, &h, sizeof(header));
+ sz = read(fd, &h, sizeof(header));
if (sz != sizeof(header) || !is_valid_mn(h.mn) || h.size < 1) { close(fd); printf("[PAM DEBUG]: bad header!\n"); return PAM_SERVICE_ERR; }
- printf("[PAM DEBUG]: data size=%d\n", h.size);
+ printf("[PAM DEBUG]: data size=%lu\n", h.size);
- char* idkey = (char*)malloc(h.size + 1);
- if (!idkey) { close(fd); printf("[PAM DEBUG] Bad alloc!\n"); return PAM_SERVICE_ERR; }
+ *idkey = (char*)malloc(h.size + 1);
+ if (!*idkey) { close(fd); printf("[PAM DEBUG] Bad alloc!\n"); return PAM_SERVICE_ERR; }
- memset(idkey, 0, h.size + 1);
- size_t count = read(fd, idkey, h.size);
+ memset(*idkey, 0, h.size + 1);
+ sz = read(fd, *idkey, h.size);
close(fd);
+ if (sz != h.size) { free(idkey); printf("[PAM DEBUG] Bad data read!\n"); return PAM_SERVICE_ERR; }
+ return PAM_SUCCESS;
+}
- if (count != h.size) { free(idkey); printf("[PAM DEBUG] Bad data read!\n"); return PAM_SERVICE_ERR; }
- printf("[PAM DEBUG] Data read:\n%s\n", idkey);
+int authenticate(pam_handle_t* pamh, const char* uuid)
+{
+ char* file_content;
+ struct json_object* database;
+ struct json_object* key;
+
+ file_content = get_file_content(DATABASE_FILE);
+ if (!file_content)
+ {
+ printf("[PAM DEBUG] Failed to read database file (%s)\n", DATABASE_FILE);
+ return PAM_SERVICE_ERR;
+ }
+
+ database = json_tokener_parse(file_content);
+ if (!database)
+ {
+ printf("[PAM DEBUG] Failed to parse the database\n");
+ return PAM_SERVICE_ERR;
+ }
+
+ if (json_object_object_get_ex(database, uuid, &key))
+ {
+ printf("[PAM] Key found!\n");
+ printf("[PAM DEBUG] pam_set_item(\"%s\")\n", uuid);
+ pam_set_item(pamh, PAM_USER, uuid);
+
+ const char* pam_authtok;
+ if (pam_get_item(pamh, PAM_AUTHTOK, (const void**)&pam_authtok) == PAM_SUCCESS && !pam_authtok)
+ pam_set_item(pamh, PAM_AUTHTOK, uuid);
+
+ json_object_put(database);
+ free(file_content);
+ return PAM_SUCCESS;
+ }
+
+ printf("[PAM] Key not found!\n");
+ free(file_content);
+ if (database) json_object_put(database);
+ return PAM_AUTH_ERR;
+}
+int check_device(pam_handle_t* pamh, const char* device)
+{
+ char* idkey;
+ int ret;
+
+ ret = read_device(device, &idkey);
+ if (ret != PAM_SUCCESS) return ret;
+
+ printf("[PAM DEBUG] Data read:\n%s\n", idkey);
+
json_object* idkey_json = json_tokener_parse(idkey);
- if (!idkey_json) { free(idkey); printf("[PAM DEBUG] Failed to parse json data!\n"); return PAM_SERVICE_ERR; }
+ if (!idkey_json)
+ {
+ free(idkey);
+ printf("[PAM DEBUG] Failed to parse json data!\n");
+ return PAM_SERVICE_ERR;
+ }
json_object* uuid_json;
- if(!json_object_object_get_ex(idkey_json, "uuid", &uuid_json)) { free(idkey); printf("[PAM DEBUG]: The json does not contains a valid uuid\n"); return PAM_SERVICE_ERR; }
+ if(!json_object_object_get_ex(idkey_json, "uuid", &uuid_json))
+ {
+ free(idkey);
+ printf("[PAM DEBUG] The json does not contains a valid uuid\n");
+ return PAM_SERVICE_ERR;
+ }
const char* uuid = json_object_get_string(uuid_json);
printf("[PAM DEBUG] uuid: %s\n", uuid);
-
- // TODO: Check if the uuid is accepted
- const char* const ids[] = {
- "4f29e9ea-600a-11e7-8331-c70192ecfa55",
- "13126524-6256-11e7-be33-3f4e4481a8c9",
- NULL
- };
-
- int i = 0;
- while(ids[i])
- {
- if (!strcmp(ids[i], uuid))
- {
- printf("[PAM DEBUG] pam_set_item(\"%s\")\n", uuid);
- pam_set_item(pamh, PAM_USER, uuid);
-
- const char* pam_authtok;
- if (pam_get_item(pamh, PAM_AUTHTOK, (const void**)&pam_authtok) == PAM_SUCCESS && !pam_authtok)
- pam_set_item(pamh, PAM_AUTHTOK, uuid);
-
- return PAM_SUCCESS;
- }
- ++i;
- }
- return PAM_AUTH_ERR;
+ ret = authenticate(pamh, uuid);
+ free(idkey);
+ json_object_put(idkey_json);
+ return ret;
}
void log_pam(const char* fname, int flags, int argc, const char** argv, const char* device)
{
- printf("[PAM DEBUG]: ---------- %s ----------\n", fname);
- printf("[PAM DEBUG]: flags: %d\n", flags);
+ printf("[PAM DEBUG] ---------- %s ----------\n", fname);
+ printf("[PAM DEBUG] flags: %d\n", flags);
for(int i = 0; i < argc; ++i)
{
- printf("[PAM DEBUG]: argv[%d]: %s\n", i, argv[i]);
+ printf("[PAM DEBUG] argv[%d]: %s\n", i, argv[i]);
}
- printf("[PAM DEBUG]: device: %s\n", device);
- printf("[PAM DEBUG]: ----------------------------------------\n");
+ printf("[PAM DEBUG] device: %s\n", device);
+ printf("[PAM DEBUG] ----------------------------------------\n");
}
/*!